Form 8-K

8-K — WESCO INTERNATIONAL INC

Accession: 0000929008-26-000021

Filed: 2026-07-30

Period: 2026-07-30

CIK: 0000929008

SIC: 5063 (WHOLESALE-ELECTRICAL APPARATUS & EQUIPMENT, WIRING SUPPLIES)

Item: Results of Operations and Financial Condition

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — wcc-20260730.htm (Primary)

EX-99.1 (wcc-2q2026earnings.htm)

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8-K

8-K (Primary)

Filename: wcc-20260730.htm · Sequence: 1

wcc-20260730

0000929008false00009290082026-07-302026-07-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 30, 2026

WESCO International, Inc.

(Exact name of registrant as specified in its charter)

Delaware 001-14989 25-1723342

(State or other jurisdiction of

incorporation) (Commission File Number) (IRS Employer

Identification No.)

225 West Station Square Drive

Suite 700 15219

Pittsburgh, Pennsylvania (Zip Code)

(Address of principal executive offices)

(412) 454-2200

(Registrant's telephone number, including area code)

Not applicable.

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, par value $.01 per share WCC New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition.

The information in this Item 2.02 is being furnished and shall not be deemed “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. The information in this Item 2.02 shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended.

On July 30, 2026, WESCO International, Inc. (the “Company”) issued a press release announcing its financial results for the second quarter of 2026. A copy of the press release is attached hereto as Exhibit 99.1.

Item 7.01 Regulation FD Disclosure.

The information in this Item 7.01 is being furnished and shall not be deemed “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. The information in this Item 7.01 shall not be incorporated by reference into any registration statement or other document pursuant to the Securities Act of 1933, as amended.

A slide presentation to be used by executive management of the Company in connection with its discussions with investors regarding the Company's financial results for the second quarter of 2026 is included in Exhibit 99.2 to this report and is being furnished in accordance with Regulation FD of the Securities and Exchange Commission.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No. Description

99.1

Press Release, dated July 30, 2026

99.2

Slide presentation for investors, dated July 30, 2026

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

WESCO International, Inc.

(Registrant)

July 30, 2026 By: /s/ Indraneel Dev

(Date) Indraneel Dev

Executive Vice President and Chief Financial Officer

EX-99.1

Filename: wcc-2q2026earnings.htm · Sequence: 2

Document

NEWS RELEASE

WESCO International, Inc. / 225 West Station Square Drive, Suite 700 / Pittsburgh, PA 15219

Wesco International Reports Second Quarter 2026 Results

•Record second quarter reported net sales of $6.7 billion, up 13% YOY and up 10% sequentially

–Organic sales up 13% YOY

–Data center sales of $1.5 billion, up ~45% YOY

•Record total company backlog, up ~60% YOY

•Second quarter operating margin of 5.7%, up 20 basis points YOY; adjusted EBITDA margin of 7.3%, up 60 basis points YOY

•Second quarter diluted EPS of $4.23; record adjusted diluted EPS of $4.57, up 35% YOY

•Second quarter operating cash flow of $54 million; free cash flow of $32 million

•Raising 2026 outlook reflecting exceptional results in first half of the year and accelerating business momentum

PITTSBURGH, July 30, 2026 /PR Newswire/ -- Wesco International (NYSE: WCC), a leading provider of business-to-business distribution, logistics services and supply chain solutions, announces its results for the second quarter of 2026.

“We delivered another exceptional quarter marked by continued market outperformance and accelerating business momentum. Sales, backlog, adjusted EBITDA, and adjusted earnings per share all increased versus the prior year and achieved records that exceeded our plan. Free cash flow generation was also positive and exceeded our expectations. We have now posted four consecutive quarters of double-digit sales growth fueled by data centers. Beyond our outsized growth in data centers, demand remained strong across the rest of our diversified portfolio and end markets as customers continue to invest in major infrastructure projects. Especially noteworthy, backlog was up approximately 60%, to a new record level, reflecting the benefits of the ongoing secular growth trends and the continued effectiveness of our One Wesco cross-selling strategy. We achieved a major milestone this quarter with a significant multi-year Grid Services award in our UBS business from a hyperscale data center customer. This win represents an important step in diversifying our UBS customer base and expanding our comprehensive data center offerings to include power solutions in addition to our extensive white space and gray space product and service offerings. As recently announced, we also strengthened our end-to-end capabilities and cooling solutions for data center customers through the acquisition of Singapore-based Newark Engineering,” said John Engel, Chairman, President, and CEO.

Mr. Engel concluded, “We are very pleased with our second quarter results and continued positive business momentum as we enter the second half of the year. Our backlog growth was fueled by multi-year customer commitments demonstrating our transformation into a leading infrastructure solutions provider serving communications, security, electrical, utility and power markets. The power of our customer value proposition, global capabilities, and leading portfolio of products, services and solutions is clear as we continue to outperform the market. As a result, we are significantly raising our full-year 2026 outlook reflecting the favorable secular growth trends and our confidence in continued strong execution. As the market leader, and with positive momentum building, I’m bullish that Wesco will continue to outperform our markets and deliver superior value to our customers, suppliers, and shareholders in the second half of 2026 and beyond.”

Key Financial Highlights

Three Months Ended June 30 Six Months Ended June 30

($ in millions except per share data)

2026 Reported

2025 Reported

Change vs prior year quarter

2026 Reported

2025 Reported

Change vs prior year

GAAP Results

Net sales $6,665.1 $5,899.6 13.0% $12,745.2 $11,243.3 13.4%

Selling, general, and administrative expenses

$1,022.7 $872.2 17.3% $1,970.3 $1,708.5 15.3%

Operating profit

$382.2 $322.2 18.6% $675.7 $563.1 20.0%

Net income attributable to common stockholders $209.0 $189.2 10.5% $362.8 $293.2 23.7%

Earnings per diluted share $4.23 $3.83 10.4% $7.33 $5.92 23.8%

Operating cash flow $53.7 $107.8 (50.2)% $275.1 $135.8 102.6%

Effective tax rate 22.9% 26.1% (320) basis points 22.5% 25.0% (250) basis points

($ in millions except per share data)

2026 Adjusted

2025 Adjusted

Change vs prior year quarter

2026 Adjusted

2025 Adjusted

Change vs prior year

Non-GAAP Results

Organic sales growth 12.6% 7.2% N/A 12.5% 6.4% N/A

Gross profit $1,456.0 $1,242.7 17.2% $2,747.8 $2,368.3 16.0%

Gross margin 21.8% 21.1% 70 basis points 21.6% 21.1% 50 basis points

Adjusted selling, general, and administrative expenses $999.5 $864.1 15.7% $1,929.6 $1,693.1 14.0%

Adjusted EBITDA

$487.2 $394.2 23.6% $876.0 $704.9 24.3%

Adjusted EBITDA margin

7.3% 6.7% 60 basis points 6.9% 6.3% 60 basis points

Adjusted net income attributable to common stockholders $225.6 $167.5 34.7% $392.4 $277.2 41.6%

Adjusted earnings per diluted share $4.57 $3.39 34.8% $7.93 $5.60 41.6%

Free cash flow $32.3 $86.5 (62.7)% $245.7 $95.9 156.2%

Net Sales

•On an organic basis, which removes differences in foreign exchange rates and the impact from the number of workdays, sales for the second quarter of 2026 grew by 12.6%. The increase in organic sales reflects volume growth in all three segments (CSS, EES and UBS), as well as a favorable impact from changes in price. Sequentially, net sales increased 9.6% and organic sales grew by 6.6%. We had record backlog at the end of the second quarter of 2026, up by approximately 60% compared to the end of the second quarter of 2025.

•For the first six months of 2026, organic sales grew by 12.5%. The increase in organic sales reflects volume growth in all three segments (CSS, EES and UBS), as well as a favorable impact from changes in price.

Gross Profit and Gross Margin

•The increase in gross margin for the three and six months ended June 30, 2026 reflects improved gross margin in the EES and CSS segments, partially offset by a decline in the UBS segment.

Selling, General, and Administrative (“SG&A”) Expenses

•The increase in SG&A expenses for the second quarter of 2026 is primarily driven by an increase in commissions and incentives due to company performance, as well as higher salaries and benefits. SG&A expenses for the second quarter of 2026 include $23.2 million of digital transformation costs, compared to $8.1 million of digital transformation and restructuring costs for the second quarter of 2025. Adjusted for these costs, SG&A expenses were 15.0% and 14.6% of net sales for the second quarter of 2026 and 2025, respectively.

•The increase in SG&A expenses for the first six months of 2026 is primarily driven by an increase in commissions and incentives due to company performance, as well as higher salaries and benefits. SG&A expenses for the first six months of 2026 include $40.7 million of digital transformation costs, compared to $15.4 million of digital transformation and restructuring costs for the first six months of 2025. Adjusted for these costs, SG&A expenses were 15.1% of net sales for the first six months of 2026 and 2025.

Adjusted EBITDA and Adjusted EBITDA Margin

•The increase in adjusted EBITDA and adjusted EBITDA margin for the the second quarter of 2026 primarily reflects higher sales and gross margin. Sequentially, adjusted EBITDA margin increased 90 basis points.

•The increase in adjusted EBITDA for the first six months of 2026 primarily reflects higher sales and gross margin.

Effective Tax Rate

•The lower effective tax rates for the three and six months ended June 30, 2026 are largely driven by higher discrete income tax benefits relating to the exercise and vesting of stock-based awards as compared to the prior year periods.

Adjusted Earnings Per Diluted Share

•The increase in adjusted earnings per diluted share in the second quarter of 2026 reflects higher adjusted EBITDA, as described above. There was also an unfavorable $17.5 million increase in interest expense primarily driven by higher net term debt throughout the quarter compared to the prior year, as well as a $10.0 million non-cash loss on extinguishment from the redemption of the 2028 Notes, partially offset by lower borrowings and lower rates on the Receivables Facility and the Revolving Credit Facility. Additionally, the prior year period included the favorable impact of the June 2025 redemption of the Company's 10.625% Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock (the “Series A Preferred Stock”), partially offset by $12.9 million of preferred stock dividends.

•The increase in adjusted earnings per diluted share in the first six months of 2026 reflects higher adjusted EBITDA, partially offset by a $27.9 million increase in interest expense primarily driven by higher net term debt throughout the first six months compared to the prior year, as well as a $10.0 million non-cash loss on extinguishment from the redemption of the 2028 Notes, partially offset by lower borrowings and lower rates on the Receivables Facility and the Revolving Credit Facility. Additionally, the prior year period included the favorable impact of the Series A Preferred Stock redemption, partially offset by $27.3 million of preferred stock dividends.

Operating Cash Flow

•Net cash provided by operating activities for the second quarter of 2026 totaled $53.7 million compared to $107.8 million in the second quarter of 2025. The $54.1 million decrease is driven by a $182.8 million impact from changes in trade accounts receivable and a $155.3 million impact from changes in other current and noncurrent assets. The impact from trade accounts receivable was primarily due to sales growth in all three segments, as well as the timing of receipts from customers as compared to the prior year, and the impact from other current and noncurrent assets was primarily due to increases in supplier prepayments. These decreases were partially offset by a $129.9 million impact from changes in other current and noncurrent liabilities, driven by increases in deferred revenue. Additionally an increase in net income as adjusted for certain non-cash items also offset the decrease in operating cash flows.

•Net cash provided by operating activities for the first six months of 2026 totaled $275.1 million, compared to $135.8 million for the first six months of 2025. The $139.3 million increase is driven by a $170.4 million impact from changes in other current and noncurrent liabilities, primarily due to increases in deferred revenue. Accounts payable additionally contributed to the increase, with a $151.3 million impact driven by increased inventory purchases, as well as the timing of inventory purchases and payments to suppliers as compared to the prior year. An increase in net income as adjusted for certain non-cash items also contributed to the increase in operating cash flows. These increases were partially offset by a $209.8 million impact from changes in trade accounts receivable and a $168.1 million impact from changes in other current and noncurrent assets. The impact from trade accounts receivable was primarily due to sales growth in all three segments, as well as the timing of receipts from customers as compared to the prior year, and the impact from other current and noncurrent assets was primarily due to increases in supplier prepayments.

Webcast and Teleconference Access

Wesco will conduct a webcast and teleconference to discuss the second quarter of 2026 earnings as described in this News Release on Thursday, July 30, 2026, at 10:00 a.m. E.T. The call will be broadcast live over the internet and can be accessed from the Investor Relations page of the Company's website at https://investors.wesco.com. The call will be archived on this internet site for seven days.

Wesco International (NYSE: WCC) builds, connects, powers and protects the world. Headquartered in Pittsburgh, Pennsylvania, Wesco is a FORTUNE 500® company with approximately $24 billion in annual sales in 2025 and a leading provider of business-to-business distribution, logistics services and supply chain solutions. Wesco offers a best-in-class product and services portfolio of Electrical and Electronic Solutions, Communications and Security Solutions, and Utility and Broadband Solutions. The Company employs approximately 21,000 people, partners with the industry’s premier suppliers, and serves thousands of customers around the world. With millions of products, end-to-end supply chain services, and significant digital capabilities, Wesco provides innovative solutions to meet customer needs across commercial and industrial businesses, technology companies, telecommunications providers, and utilities. Wesco operates more than 700 sites, including distribution centers, fulfillment centers, and sales offices in approximately 50 countries, providing a local presence for customers and a global network to serve multi-location businesses and global corporations.

Forward-Looking Statements

All statements made herein that are not historical facts should be considered as "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements involve known and unknown risks, uncertainties and other factors that may cause actual results to differ materially. These statements include, but are not limited to, statements regarding business strategy, growth strategy, competitive strengths, productivity and profitability enhancement, competition, new product and service introductions, and liquidity and capital resources. Such statements can generally be identified by the use of words such as "anticipate," "plan," "believe," "estimate," "intend," "expect," "project," and similar words, phrases or expressions or future or conditional verbs such as "could," "may," "should," "will," and "would," although not all forward-looking statements contain such words. These forward-looking statements are based on current expectations and beliefs of Wesco's management, as well as assumptions made by, and information currently available to, Wesco's management, current market trends and market conditions and involve risks and uncertainties, many of which are outside of Wesco's and Wesco's management's control, and which may cause actual results to differ materially from those contained in forward-looking statements. Accordingly, you should not place undue reliance on such statements.

Important factors that could cause actual results or events to differ materially from those presented or implied in the forward-looking statements include, among others, the failure to achieve the anticipated benefits of, and other risks associated with, acquisitions, joint ventures, divestitures and other corporate transactions; the inability to successfully integrate acquired businesses; the impact of increased interest rates or borrowing costs; fluctuations in currency exchange rates; evolving impacts from tariffs or other trade tensions between the U.S. and other countries (including implementation of new tariffs and retaliatory measures); failure to adequately protect Wesco's intellectual property or successfully defend against infringement claims; the inability to successfully deploy new technologies, digital products and information systems or to otherwise adapt to emerging technologies in the marketplace, such as those incorporating artificial intelligence (AI); risks relating to our use or reliance on AI; failure to execute on our efforts and programs related to environmental, social and governance (ESG) matters; unanticipated expenditures or other adverse developments related to compliance with new or stricter government policies, laws or regulations, including those relating to data privacy, cybersecurity, competition, sustainability and environmental protection; the inability to successfully develop, manage or implement new technology initiatives or business strategies, including with respect to the expansion of e-commerce or AI capabilities and other digital solutions and digitalization initiatives; disruption of information technology systems or operations; natural disasters (including as a result of climate change), health epidemics, pandemics and other outbreaks; supply chain disruptions; geopolitical conflicts and issues, such as the ongoing Middle East and Russia/Ukraine conflicts; the impact of changing and expanding export controls, sanctions, and data localization rules; the failure to manage the increased risks and impacts of cyber incidents or data breaches; and exacerbation of key materials shortages, inflationary cost pressures, material cost increases, demand volatility, and logistics and capacity constraints, any of which may have a material adverse effect on the Company's business, results of operations and financial condition. All such factors are difficult to predict and are beyond the Company's control. Additional factors that could cause results to differ materially from those described above can be found in Wesco's most recent Annual Report on Form 10-K and other periodic reports filed with the U.S. Securities and Exchange Commission.

Contact Information

Investor Relations Corporate Communications

Scott Gaffner

Senior Vice President, Investor Relations

investorrelations@wescodist.com Jennifer Sniderman

Vice President, Corporate Communications

Corporate_Communications@wesco.com

http://www.wesco.com

WESCO INTERNATIONAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(in millions, except per share amounts)

(Unaudited)

Three Months Ended

June 30, 2026 June 30, 2025

Net sales $ 6,665.1 $ 5,899.6

Cost of goods sold (excluding depreciation and amortization) 5,209.1 78.2 % 4,656.9 78.9 %

Selling, general and administrative expenses 1,022.7 15.3 % 872.2 14.8 %

Depreciation and amortization 51.1 48.3

Income from operations 382.2 5.7 % 322.2 5.5 %

Interest expense, net 110.4 92.9

Other income, net (0.2) (7.3)

Income before income taxes 272.0 4.1 % 236.6 4.0 %

Provision for income taxes 62.4 61.8

Net income 209.6 3.1 % 174.8 3.0 %

Less: Net income attributable to noncontrolling interests

0.6 0.3

Net income attributable to WESCO International, Inc. 209.0 3.1 % 174.5 3.0 %

Plus: Gain on redemption of Series A Preferred Stock — 27.6

Less: Preferred stock dividends

— 12.9

Net income attributable to common stockholders $ 209.0 3.1 % $ 189.2 3.2 %

Earnings per diluted share attributable to common stockholders $ 4.23 $ 3.83

Weighted-average common shares outstanding and common share equivalents used in computing earnings per diluted common share 49.4 49.4

WESCO INTERNATIONAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(in millions, except per share amounts)

(Unaudited)

Six Months Ended

June 30, 2026 June 30, 2025

Net sales $ 12,745.2 $ 11,243.3

Cost of goods sold (excluding depreciation and amortization) 9,997.4 78.4 % 8,875.0 78.9 %

Selling, general and administrative expenses 1,970.3 15.5 % 1,708.5 15.2 %

Depreciation and amortization 101.8 96.7

Income from operations 675.7 5.3 % 563.1 5.0 %

Interest expense, net 207.1 179.2

Other income, net (0.6) (7.1)

Income before income taxes 469.2 3.7 % 391.0 3.5 %

Provision for income taxes 105.5 97.9

Net income 363.7 2.9 % 293.1 2.6 %

Less: Net income attributable to noncontrolling interests

0.9 0.2

Net income attributable to WESCO International, Inc. 362.8 2.8 % 292.9 2.6 %

Plus: Gain on redemption of Series A Preferred Stock

— 27.6

Less: Preferred stock dividends

— 27.3

Net income attributable to common stockholders $ 362.8 2.8 % $ 293.2 2.6 %

Earnings per diluted share attributable to common stockholders $ 7.33 $ 5.92

Weighted-average common shares outstanding and common share equivalents used in computing earnings per diluted common share 49.5 49.5

WESCO INTERNATIONAL, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(dollar amounts in millions)

(Unaudited)

As of

June 30,

2026 December 31,

2025

Assets

Current assets:

Cash and cash equivalents $ 808.9 $ 604.8

Trade accounts receivable, net 4,685.0 4,069.6

Inventories 4,418.0 4,008.8

Other current assets 834.6 773.0

Total current assets 10,746.5 9,456.2

Goodwill and intangible assets 5,036.0 5,112.6

Other assets 2,025.3 1,926.1

Total assets $ 17,807.8 $ 16,494.9

Liabilities and Equity

Current liabilities:

Accounts payable $ 3,740.3 $ 3,030.5

Short-term debt and current portion of long-term debt, net 25.0 25.0

Other current liabilities 1,373.7 1,241.3

Total current liabilities 5,139.0 4,296.8

Long-term debt, net 5,911.1 5,756.4

Other noncurrent liabilities 1,545.1 1,415.3

Total liabilities 12,595.2 11,468.5

Equity:

Total equity 5,212.6 5,026.4

Total liabilities and equity $ 17,807.8 $ 16,494.9

WESCO INTERNATIONAL, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(dollar amounts in millions)

(Unaudited)

Six Months Ended

June 30,

2026 June 30,

2025

Operating activities:

Net income $ 363.7 $ 293.1

Add back (deduct):

Depreciation and amortization 101.8 96.7

Change in trade receivables, net (641.0) (431.2)

Change in inventories (432.4) (403.1)

Change in accounts payable 726.0 574.7

Other, net 157.0 5.6

Net cash provided by operating activities 275.1 135.8

Investing activities:

Capital expenditures (51.6) (42.2)

Acquisition payments, net of cash acquired — (36.0)

Other, net 3.6 1.3

Net cash used in investing activities (48.0) (76.9)

Financing activities:

Debt borrowings, net(1)

152.0 605.0

Payments for taxes related to net-share settlement of equity awards (48.1) (18.4)

Repurchases of common stock (39.9) (50.0)

Redemption of preferred stock — (540.3)

Payment of common stock dividends (48.8) (44.2)

Payment of preferred stock dividends — (27.3)

Other, net (37.1) (33.1)

Net cash used in financing activities (21.9) (108.3)

Effect of exchange rate changes on cash and cash equivalents (1.1) 13.8

Net change in cash and cash equivalents 204.1 (35.6)

Cash and cash equivalents at the beginning of the period 604.8 702.6

Cash and cash equivalents at the end of the period $ 808.9 $ 667.0

(1) The six months ended June 30, 2026 includes the issuance of the Company's $650 million aggregate principal amount of 5.250% Senior Notes due 2031 (the “2031 Notes”) and $850 million aggregate principal amount of 5.500% Senior Notes due 2034 (the “2034 Notes” and, together with the 2031 Notes, the “2031 and 2034 Notes”). The proceeds from the issuance of the 2031 and 2034 Notes were used for the redemption of the Company's $1,325 million aggregate principal amount of 7.250% Senior Notes due 2028 (the “2028 Notes”) and to repay a portion of the amounts outstanding under the Revolving Credit Facility. The six months ended June 30, 2025 includes the issuance of the Company's $800 million aggregate principal amount of 6.375% senior notes due 2033 (the “2033 Notes”). The Company used the net proceeds from the issuance of the 2033 Notes to redeem all of the Company’s outstanding 10.625% Series A Fixed-Rate Reset Cumulative Perpetual Preferred Stock (the “Series A Preferred Stock”) and all of the related depositary shares representing fractional interests in the Series A Preferred Stock, and to repay a portion of the amounts outstanding under the Revolving Credit Facility.

NON-GAAP FINANCIAL MEASURES

In addition to the results provided in accordance with U.S. Generally Accepted Accounting Principles (“U.S. GAAP”) above, this earnings release includes certain non-GAAP financial measures. These financial measures include organic sales growth, gross profit, gross margin, earnings before interest, taxes, depreciation and amortization (EBITDA), adjusted EBITDA, adjusted EBITDA margin, financial leverage, free cash flow, adjusted selling, general and administrative expenses, adjusted income from operations, adjusted operating margin, adjusted other non-operating (income) expense, adjusted provision for income taxes, adjusted income before income taxes, adjusted net income, adjusted net income attributable to WESCO International, Inc., adjusted net income attributable to common stockholders, and adjusted earnings per diluted share. The Company believes that these non-GAAP measures are useful to investors as they provide a better understanding of our financial condition and results of operations on a comparable basis. Additionally, certain non-GAAP measures either focus on or exclude items impacting comparability of results such as digital transformation costs, restructuring costs, cloud computing arrangement amortization, and the related income tax effects, allowing investors to more easily compare the Company's financial performance from period to period. Management does not use these non-GAAP financial measures for any purpose other than the reasons stated above.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Organic Sales Growth by Segment - Three Months Ended:

Three Months Ended Growth/(Decline)

June 30, 2026 June 30, 2025 Reported

Sales Acquisition Foreign Exchange Workday Organic Sales

EES $ 2,510.7 $ 2,257.8 11.2 % — % 0.3 % — % 10.9 %

CSS 2,681.2 2,265.2 18.4 % — % 0.9 % — % 17.5 %

UBS 1,473.2 1,376.6 7.0 % — % — % — % 7.0 %

Total net sales $ 6,665.1 $ 5,899.6 13.0 % — % 0.4 % — % 12.6 %

Organic Sales Growth by Segment - Six Months Ended:

Six Months Ended Growth/(Decline)

June 30, 2026 June 30, 2025 Reported

Sales Acquisition Foreign Exchange Workday Organic Sales

EES $ 4,754.9 $ 4,323.1 10.0 % — % 0.9 % — % 9.1 %

CSS 5,160.1 4,265.5 21.0 % — % 1.3 % — % 19.7 %

UBS 2,830.2 2,654.7 6.6 % — % 0.2 % — % 6.4 %

Total net sales $ 12,745.2 $ 11,243.3 13.4 % — % 0.9 % — % 12.5 %

Organic Sales Growth by Segment - Sequential:

Three Months Ended Growth/(Decline)

June 30, 2026 March 31, 2026 Reported

Sales Acquisition Foreign Exchange Workday Organic Sales

EES $ 2,510.7 $ 2,244.2 11.9 % — % (0.3) % 3.2 % 9.0 %

CSS 2,681.2 2,478.9 8.2 % — % (0.1) % 3.2 % 5.1 %

UBS 1,473.2 1,357.0 8.6 % — % (0.1) % 3.2 % 5.5 %

Total net sales $ 6,665.1 $ 6,080.1 9.6 % — % (0.2) % 3.2 % 6.6 %

Note: Organic sales growth is a non-GAAP financial measure of sales performance. Organic sales growth is calculated by deducting the percentage impact from acquisitions and divestitures for one year following the respective transaction, fluctuations in foreign exchange rates and number of workdays from the reported percentage change in consolidated net sales. Workday impact represents the change in the number of operating days period-over-period after adjusting for weekends and public holidays in the United States; There was no change in the number of workdays in the second quarter of 2026 compared to the second quarter of 2025, or in the first six months of 2026 compared to the first six months of 2025. The second quarter of 2026 had two more workdays compared to the first quarter of 2026.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Three Months Ended Six Months Ended

Gross Profit: June 30, 2026 June 30, 2025 June 30, 2026 June 30, 2025

Net sales $ 6,665.1 $ 5,899.6 $ 12,745.2 $ 11,243.3

Cost of goods sold (excluding depreciation and amortization) 5,209.1 4,656.9 9,997.4 8,875.0

Gross profit $ 1,456.0 $ 1,242.7 $ 2,747.8 $ 2,368.3

Gross margin 21.8 % 21.1 % 21.6 % 21.1 %

Note: Gross profit is a financial measure commonly used in the distribution industry. Gross profit is calculated by deducting cost of goods sold, excluding depreciation and amortization, from net sales. Gross margin is calculated by dividing gross profit by net sales.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Three Months Ended Six Months Ended

June 30, 2026 June 30, 2025 June 30, 2026 June 30, 2025

Adjusted SG&A Expenses:

SG&A expenses $ 1,022.7 $ 872.2 $ 1,970.3 $ 1,708.5

Digital transformation costs(1)

(23.2) (7.6) (40.7) (13.8)

Restructuring costs(2)

— (0.5) — (1.6)

Adjusted SG&A expenses $ 999.5 $ 864.1 $ 1,929.6 $ 1,693.1

Percentage of net sales 15.0 % 14.6 % 15.1 % 15.1 %

Adjusted Income from Operations:

Income from operations $ 382.2 $ 322.2 $ 675.7 $ 563.1

Digital transformation costs(1)

23.2 7.6 40.7 13.8

Restructuring costs(2)

— 0.5 — 1.6

Adjusted income from operations $ 405.4 $ 330.3 $ 716.4 $ 578.5

Adjusted income from operations margin % 6.1 % 5.6 % 5.6 % 5.1 %

Adjusted Other Income, net:

Other income, net $ (0.2) $ (7.3) $ (0.6) $ (7.1)

Loss on termination of business arrangement(3)

— — — (0.3)

Adjusted other income, net $ (0.2) $ (7.3) $ (0.6) $ (7.4)

Adjusted Provision for Income Taxes:

Provision for income taxes $ 62.4 $ 61.8 $ 105.5 $ 97.9

Income tax effect of adjustments to income from operations and other income, net(4)

6.6 2.2 11.1 4.1

Adjusted provision for income taxes $ 69.0 $ 64.0 $ 116.6 $ 102.0

Adjusted Net Income Attributable to Common Stockholders:

Net income attributable to common stockholders $ 209.0 $ 189.2 $ 362.8 $ 293.2

Digital transformation costs(1)

23.2 7.6 40.7 13.8

Restructuring costs(2)

— 0.5 — 1.6

Loss on termination of business arrangement(3)

— — — 0.3

Income tax effect of adjustments to income from operations and other income, net(4)

(6.6) (2.2) (11.1) (4.1)

Gain on redemption of Series A Preferred Stock — (27.6) — (27.6)

Adjusted net income attributable to common stockholders $ 225.6 $ 167.5 $ 392.4 $ 277.2

(1) Digital transformation costs include costs associated with certain digital transformation initiatives.

(2) Restructuring costs include severance costs incurred pursuant to an ongoing restructuring plan.

(3) Loss on termination of business arrangement represents the loss recognized as a result of management's decision to terminate a business arrangement with a third party.

(4) The adjustments to income from operations and other income, net have been tax effected at rates of 28.4% and 27.2% for the three and six months ended June 30, 2026, respectively, and 26.3% for the three and six months ended June 30, 2025.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Three Months Ended Six Months Ended

Adjusted Earnings per Diluted Share: June 30, 2026 June 30, 2025 June 30, 2026 June 30, 2025

Adjusted income from operations $ 405.4 $ 330.3 $ 716.4 $ 578.5

Interest expense, net 110.4 92.9 207.1 179.2

Adjusted other income, net (0.2) (7.3) (0.6) (7.4)

Adjusted income before income taxes 295.2 244.7 509.9 406.7

Adjusted provision for income taxes 69.0 64.0 116.6 102.0

Adjusted net income 226.2 180.7 393.3 304.7

Net income attributable to noncontrolling interests 0.6 0.3 0.9 0.2

Adjusted net income attributable to WESCO International, Inc. 225.6 180.4 392.4 304.5

Preferred stock dividends — 12.9 — 27.3

Adjusted net income attributable to common stockholders $ 225.6 $ 167.5 $ 392.4 $ 277.2

Diluted shares 49.4 49.4 49.5 49.5

Adjusted earnings per diluted share $ 4.57 $ 3.39 $ 7.93 $ 5.60

Note: For the three and six months ended June 30, 2026, SG&A expenses, income from operations, provision for income taxes, net income attributable to common stockholders and earnings per diluted share have been adjusted to exclude digital transformation costs and the related income tax effects. For the three and six months ended June 30, 2025, SG&A expenses, income from operations, the provision for income taxes, net income attributable to common stockholders and earnings per diluted share have been adjusted to exclude digital transformation costs, restructuring costs, and the related income tax effects, and the gain on redemption of the Company's Series A Preferred Stock. Other non-operating (income) expense, the provision for income taxes, net income attributable to common stockholders and earnings per diluted share for the six months ended June 30, 2025 were also adjusted to exclude the loss on termination of business arrangement and the related income tax effect. These non-GAAP financial measures provide a better understanding of our financial results on a comparable basis.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Three Months Ended June 30, 2026

EBITDA and Adjusted EBITDA by Segment: EES CSS UBS Corporate Total

Net income attributable to common stockholders $ 204.1 $ 232.2 $ 136.8 $ (364.1) $ 209.0

Net income (loss) attributable to noncontrolling interests 0.2 0.6 — (0.2) 0.6

Provision for income taxes(1)

— — — 62.4 62.4

Interest expense, net(1)

— — — 110.4 110.4

Depreciation and amortization 13.7 19.8 9.1 8.5 51.1

EBITDA $ 218.0 $ 252.6 $ 145.9 $ (183.0) $ 433.5

Other expense (income), net 12.6 18.7 — (31.5) (0.2)

Stock-based compensation expense 0.7 1.6 0.9 15.9 19.1

Digital transformation costs(2)

— — — 23.2 23.2

Cloud computing arrangement amortization(3)

— — — 11.6 11.6

Adjusted EBITDA $ 231.3 $ 272.9 $ 146.8 $ (163.8) $ 487.2

Adjusted EBITDA margin % 9.2 % 10.2 % 10.0 % 7.3 %

(1) The reportable segments do not incur income taxes and interest expense as these costs are centrally controlled through the Corporate tax and treasury functions.

(2) Digital transformation costs include costs associated with certain digital transformation initiatives.

(3) Cloud computing arrangement amortization consists of expense recognized in selling, general and administrative expenses for capitalized implementation costs for cloud computing arrangements to support our digital transformation initiatives.

Three Months Ended June 30, 2025

EBITDA and Adjusted EBITDA by Segment: EES CSS UBS Corporate Total

Net income attributable to common stockholders $ 162.1 $ 162.1 $ 137.8 $ (272.8) $ 189.2

Net income (loss) attributable to noncontrolling interests 0.1 0.6 — (0.4) 0.3

Gain on redemption of Series A Preferred Stock — — — (27.6) (27.6)

Preferred stock dividends — — — 12.9 12.9

Provision for income taxes(1)

— — — 61.8 61.8

Interest expense, net(1)

— — — 92.9 92.9

Depreciation and amortization 12.4 19.1 7.6 9.2 48.3

EBITDA $ 174.6 $ 181.8 $ 145.4 $ (124.0) $ 377.8

Other expense (income), net 7.3 15.7 (2.2) (28.1) (7.3)

Stock-based compensation expense 1.0 1.4 0.5 5.5 8.4

Digital transformation costs(2)

— — — 7.6 7.6

Cloud computing arrangement amortization(3)

— — — 7.2 7.2

Restructuring costs(4)

— — — 0.5 0.5

Adjusted EBITDA $ 182.9 $ 198.9 $ 143.7 $ (131.3) $ 394.2

Adjusted EBITDA margin % 8.1 % 8.8 % 10.4 % 6.7 %

(1) The reportable segments do not incur income taxes and interest expense as these costs are centrally controlled through the corporate tax and treasury functions.

(2) Digital transformation costs include costs associated with certain digital transformation initiatives.

(4) Restructuring costs include severance costs incurred pursuant to an ongoing restructuring plan.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Three Months Ended March 31, 2026

EBITDA and Adjusted EBITDA by Segment: EES CSS UBS Corporate Total

Net income attributable to common stockholders $ 164.1 $ 188.3 $ 121.7 $ (320.3) $ 153.8

Net income (loss) attributable to noncontrolling interests 0.1 0.4 — (0.2) 0.3

Provision for income taxes(1)

— — — 43.1 43.1

Interest expense, net(1)

— — — 96.7 96.7

Depreciation and amortization 13.2 19.8 8.5 9.2 50.7

EBITDA $ 177.4 $ 208.5 $ 130.2 $ (171.5) $ 344.6

Other expense (income), net 6.8 13.1 (0.4) (19.9) (0.4)

Stock-based compensation expense 0.8 1.6 0.9 12.8 16.1

Digital transformation costs(2)

— — — 17.5 17.5

Cloud computing arrangement amortization(3)

— — — 11.0 11.0

Adjusted EBITDA $ 185.0 $ 223.2 $ 130.7 $ (150.1) $ 388.8

Adjusted EBITDA margin % 8.2 % 9.0 % 9.6 % 6.4 %

(1) The reportable segments do not incur income taxes and interest expense as these costs are centrally controlled through the Corporate tax and treasury functions.

(2) Digital transformation costs include costs associated with certain digital transformation initiatives.

Note: EBITDA, adjusted EBITDA and adjusted EBITDA margin % are non-GAAP financial measures that provide indicators of the Company's performance and its ability to meet debt service requirements. For the three months ended June 30, 2026 and March 31, 2026, adjusted EBITDA is defined as earnings before interest, taxes, depreciation and amortization before other non-operating expenses (income), non-cash stock-based compensation expense, digital transformation costs, and cloud computing arrangement amortization. For the three months ended June 30, 2025, adjusted EBITDA is defined as earnings before interest, taxes, depreciation and amortization before other non-operating expenses (income), non-cash stock-based compensation expense, digital transformation costs, cloud computing arrangement amortization, and restructuring costs.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Six Months Ended June 30, 2026

EBITDA and Adjusted EBITDA by Segment: EES CSS UBS Corporate Total

Net income attributable to common stockholders $ 368.2 $ 420.5 $ 258.5 $ (684.4) $ 362.8

Net income (loss) attributable to noncontrolling interests 0.3 1.1 — (0.5) 0.9

Provision for income taxes(1)

— — — 105.5 105.5

Interest expense, net(1)

— — — 207.1 207.1

Depreciation and amortization 26.9 39.5 17.7 17.7 101.8

EBITDA $ 395.4 $ 461.1 $ 276.2 $ (354.6) $ 778.1

Other expense (income), net 19.4 31.8 (0.4) (51.4) (0.6)

Stock-based compensation expense 1.5 3.2 1.7 28.8 35.2

Digital transformation costs(2)

— — — 40.7 40.7

Cloud computing arrangement amortization(3)

— — — 22.6 22.6

Adjusted EBITDA $ 416.3 $ 496.1 $ 277.5 $ (313.9) $ 876.0

Adjusted EBITDA margin % 8.8 % 9.6 % 9.8 % 6.9 %

(1) The reportable segments do not incur income taxes and interest expense as these costs are centrally controlled through the Corporate tax and treasury functions.

(2) Digital transformation costs include costs associated with certain digital transformation initiatives.

Six Months Ended June 30, 2025

EBITDA and Adjusted EBITDA by Segment: EES CSS UBS Corporate Total

Net income attributable to common stockholders $ 287.2 $ 289.3 $ 268.1 $ (551.4) $ 293.2

Net income (loss) attributable to noncontrolling interests — 0.7 — (0.5) 0.2

Gain on redemption of Series A Preferred Stock — — — (27.6) (27.6)

Preferred stock dividends — — — 27.3 27.3

Provision for income taxes(1)

— — — 97.9 97.9

Interest expense, net(1)

— — — 179.2 179.2

Depreciation and amortization 24.6 38.1 15.4 18.6 96.7

EBITDA $ 311.8 $ 328.1 $ 283.5 $ (256.5) $ 666.9

Other expense (income), net 11.7 26.6 (2.4) (43.0) (7.1)

Stock-based compensation expense 2.0 2.7 0.9 13.0 18.6

Digital transformation costs(2)

— — — 13.8 13.8

Cloud computing arrangement amortization(3)

— — — 11.1 11.1

Restructuring costs(4)

— — — 1.6 1.6

Adjusted EBITDA $ 325.5 $ 357.4 $ 282.0 $ (260.0) $ 704.9

Adjusted EBITDA margin % 7.5 % 8.4 % 10.6 % 6.3 %

(1) The reportable segments do not incur income taxes and interest expense as these costs are centrally controlled through the Corporate tax and treasury functions.

(2) Digital transformation costs include costs associated with certain digital transformation initiatives.

(4) Restructuring costs include severance costs incurred pursuant to an ongoing restructuring plan.

Note: Adjusted EBITDA and adjusted EBITDA margin % are non-GAAP financial measures that provide indicators of the Company's performance and its ability to meet debt service requirements. For the six months ended June 30, 2026, adjusted EBITDA is defined as earnings before interest, taxes, depreciation and amortization before other non-operating expenses (income), non-cash stock-based compensation expense, digital transformation costs, and cloud computing arrangement amortization. For the six months ended June 30, 2025, adjusted EBITDA is defined as earnings before interest, taxes, depreciation and amortization before other non-operating expenses (income), non-cash stock-based compensation expense, digital transformation costs, cloud computing arrangement amortization, and restructuring costs.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Twelve Months Ended

Financial Leverage: June 30,

2026 December 31,

2025

Net income attributable to common stockholders $ 715.5 $ 645.8

Net income attributable to noncontrolling interests 3.0 2.3

Gain on redemption of Series A Preferred Stock (5.3) (32.9)

Preferred stock dividends — 27.3

Provision for income taxes 221.0 213.4

Interest expense, net 414.5 386.7

Depreciation and amortization 202.6 197.6

EBITDA $ 1,551.3 $ 1,440.2

Other income, net (3.1) (9.6)

Stock-based compensation expense 57.1 40.5

Digital transformation costs(1)

62.1 35.2

Cloud computing arrangement amortization(2)

41.8 30.2

Restructuring costs(3)

(1.6) —

Adjusted EBITDA $ 1,707.6 $ 1,536.5

As of

June 30,

2026 December 31,

2025

Short-term debt and current portion of long-term debt, net $ 25.0 $ 25.0

Long-term debt, net 5,911.1 5,756.4

Debt discount and debt issuance costs(4)

49.8 48.0

Total debt 5,985.9 5,829.4

Less: Cash and cash equivalents 808.9 604.8

Total debt, net of cash $ 5,177.0 $ 5,224.6

Financial leverage ratio 3.0 3.4

(1)Digital transformation costs include costs associated with certain digital transformation initiatives.

(2)Cloud computing arrangement amortization consists of expense recognized in selling, general and administrative expenses for capitalized implementation costs for cloud computing arrangements to support our digital transformation initiatives.

(3)Reduction to restructuring costs represents the reversal of certain severance costs previously incurred pursuant to an ongoing restructuring plan.

(4)Debt is presented in the Condensed Consolidated Balance Sheets net of debt discount and debt issuance costs.

Note: Financial leverage ratio is a non-GAAP measure of the use of debt. Financial leverage ratio is calculated by dividing total debt, excluding debt issuance costs, and debt discount, net of cash, by adjusted EBITDA. EBITDA is defined as the trailing twelve months earnings before interest, taxes, depreciation and amortization. Adjusted EBITDA is defined as the trailing twelve months EBITDA before other non-operating expense (income), non-cash stock-based compensation expense, digital transformation costs, cloud computing arrangement amortization, and restructuring costs.

WESCO INTERNATIONAL, INC.

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(in millions, except per share amounts and ratios)

(Unaudited)

Three Months Ended Six Months Ended

Free Cash Flow: June 30, 2026 June 30, 2025 June 30, 2026 June 30, 2025

Cash flow provided by operations $ 53.7 $ 107.8 $ 275.1 $ 135.8

Less: Capital expenditures (28.2) (21.8) (51.6) (42.2)

Add: Other adjustments 6.8 0.5 22.2 2.3

Free cash flow $ 32.3 $ 86.5 $ 245.7 $ 95.9

Percentage of adjusted net income 14.3 % 47.9 % 62.5 % 31.5 %

Note: Free cash flow is a non-GAAP financial measure of liquidity. Capital expenditures are deducted from operating cash flow to determine free cash flow. Free cash flow is available to fund investing and financing activities. For the three and six months ended June 30, 2026 and 2025, the Company paid for certain costs related to digital transformation and restructuring. Such expenditures have been added back to operating cash flow to determine free cash flow for such periods. Our calculation of free cash flow may not be comparable to similar measures used by other companies.

EX-99.2

Filename: wcc-2q2026slides.htm · Sequence: 3

wcc-2q2026slides

Second Quarter 2026 Webcast Presentation July 30, 2026 NYSE: WCC

Forward-Looking Statements and Non-GAAP Measures 2 All statements made herein that are not historical facts should be considered as "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements involve known and unknown risks, uncertainties and other factors that may cause actual results to differ materially. These statements include, but are not limited to, statements regarding business strategy, growth strategy, competitive strengths, productivity and profitability enhancement, competition, new product and service introductions, and liquidity and capital resources. Such statements can generally be identified by the use of words such as "anticipate," "plan," "believe," "estimate," "intend," "expect," "project," and similar words, phrases or expressions or future or conditional verbs such as "could," "may," "should," "will," and "would," although not all forward-looking statements contain such words. These forward-looking statements are based on current expectations and beliefs of Wesco's management, as well as assumptions made by, and information currently available to, Wesco's management, current market trends and market conditions and involve risks and uncertainties, many of which are outside of Wesco's and Wesco's management's control, and which may cause actual results to differ materially from those contained in forward-looking statements. Accordingly, you should not place undue reliance on such statements. Important factors that could cause actual results or events to differ materially from those presented or implied in the forward-looking statements include, among others, the failure to achieve the anticipated benefits of, and other risks associated with, acquisitions, joint ventures, divestitures and other corporate transactions; the inability to successfully integrate acquired businesses; the impact of increased interest rates or borrowing costs; fluctuations in currency exchange rates; evolving impacts from tariffs or other trade tensions between the U.S. and other countries (including implementation of new tariffs and retaliatory measures); failure to adequately protect Wesco's intellectual property or successfully defend against infringement claims; the inability to successfully deploy new technologies, digital products and information systems or to otherwise adapt to emerging technologies in the marketplace, such as those incorporating artificial intelligence (AI); risks relating to our use or reliance on AI; failure to execute on our efforts and programs related to environmental, social and governance (ESG) matters; unanticipated expenditures or other adverse developments related to compliance with new or stricter government policies, laws or regulations, including those relating to data privacy, cybersecurity, competition, sustainability and environmental protection; the inability to successfully develop, manage or implement new technology initiatives or business strategies, including with respect to the expansion of e-commerce or AI capabilities and other digital solutions and digitalization initiatives; disruption of information technology systems or operations; natural disasters (including as a result of climate change), health epidemics, pandemics and other outbreaks; supply chain disruptions; geopolitical conflicts and issues, such as the ongoing Middle East and Russia/Ukraine conflicts; the impact of changing and expanding export controls, sanctions, and data localization rules; the failure to manage the increased risks and impacts of cyber incidents or data breaches; and exacerbation of key materials shortages, inflationary cost pressures, material cost increases, demand volatility, and logistics and capacity constraints, any of which may have a material adverse effect on the Company's business, results of operations and financial condition. All such factors are difficult to predict and are beyond the Company's control. Additional factors that could cause results to differ materially from those described above can be found in Wesco's most recent Annual Report on Form 10-K and other periodic reports filed with the U.S. Securities and Exchange Commission. Non-GAAP Measures In addition to the results provided in accordance with U.S. Generally Accepted Accounting Principles (“U.S. GAAP”) above, this presentation includes certain non-GAAP financial measures. These financial measures include organic sales growth, gross profit, gross margin, earnings before interest, taxes, depreciation and amortization (EBITDA), adjusted EBITDA, adjusted EBITDA margin, financial leverage, free cash flow, adjusted selling, general and administrative expenses, adjusted income from operations, adjusted operating margin, adjusted other non-operating expense (income), adjusted provision for income taxes, adjusted income before income taxes, adjusted net income, adjusted net income attributable to WESCO International, Inc., adjusted net income attributable to common stockholders, and adjusted earnings per diluted share. The Company believes that these non-GAAP measures are useful to investors as they provide a better understanding of our financial condition and results of operations on a comparable basis. Additionally, certain non-GAAP measures either focus on or exclude items impacting comparability of results such as digital transformation costs, restructuring costs, cloud computing arrangement amortization, the loss on termination of business arrangement, and the related income tax effects, allowing investors to more easily compare the Company's financial performance from period to period. Management does not use these non-GAAP financial measures for any purpose other than the reasons stated above. © 2026 Wesco International

Second Quarter Highlights and Full Year Outlook 3 Market outperformance and exceptional Q2 results driven by accelerating business momentum. • Second quarter sales were a record at $6.7B, with reported and organic sales growth of 13% – Accelerating momentum across all three business units, with Q2 sales up 10% sequentially – Total company data center sales up ~45% • Backlog increased ~60% to a record level, driven by data center wins including significant Grid Services awards and improved demand across the diversified portfolio Record second quarter sales and backlog, up 13% and ~60% respectively, with growth across all three business units. • Record adjusted EBITDA of $487 million, up 24% versus prior year, with adjusted EBITDA margin expanding 60 basis points to 7.3% • Record adjusted EPS of $4.57, up 35% versus prior year • First-half free cash flow performance above expectations • Leverage ratio improved to 3.0x from 3.4x at 2025 year-end Record adjusted EBITDA up 24%, record adjusted EPS up 35% and positive free cash flow. • Momentum continues to build across the diversified portfolio, supporting increased outlook • Benefitting from multiple secular growth trends • Focused on continuing to deliver strong profitable growth and sustained outperformance Raising 2026 outlook, reflecting exceptional results in Q2 and increased outlook for the second half. See appendix for non-GAAP definitions and reconciliations. © 2026 Wesco International

$5,900 $6,665 Q2 2025 Sales Price Volume M&A, Foreign Exchange and Workdays Q2 2026 Sales ¹ Sales growth attribution based on company estimates. ² SG&A for the reconciliation for adjusted EBITDA excludes the impact of stock-based compensation expense, digital transformation costs, cloud computing arrangement amortization and restructuring costs. See appendix for non-GAAP definitions and reconciliations. Another exceptional quarter with record sales, adjusted EBITDA and adjusted EPS Second Quarter YOY Results 4 • Reported and organic sales up 13%, driven by accelerating sales in all three business units • Strong volume growth across all three business units • Estimated price benefit of ~3% • Gross margin of 21.8%, up ~70 bps versus prior year • SG&A2 was a ~10 bps headwind due to higher incentive compensation • Record adjusted EBITDA of $487 million, up 24% year-over-year, with EBITDA margin of 7.3%, an increase of 60 bps $394 $487 Q2 2025 Adjusted EBITDA Reported Sales Gross Margin SG&A Q2 2026 Adjusted EBITDA 6.7% of sales Net Sales¹ ($Millions) Adjusted EBITDA ($Millions) 7.3% of sales 2 © 2026 Wesco International +13% Organic Sales +24% +60 bps

EPS growth attribution based on company estimates. See appendix for non-GAAP definitions and reconciliations. Outstanding earnings performance with record adjusted EPS up 35% Earnings Per Share 5 • Operating performance was the primary driver of adjusted EPS growth, driven by strong sales growth and margin expansion • Foreign exchange was a modest net headwind during the quarter Q2 EPS $3.39 $4.57 Q2 2025 Adjusted EPS Core Operations Foreign Exchange Interest Other Q2 2026 Adjusted EPS © 2026 Wesco International • Higher interest expense was also a modest headwind to year-over-year EPS growth • A lower effective tax rate and the elimination of preferred dividends contributed to year-over-year adjusted EPS growth +35%

Record sales and profitability on continued strong data center momentum Communications and Security Solutions (CSS) 6 See appendix for non-GAAP definitions and reconciliations. Numbers may not sum due to rounding. Q2 Results $ Millions Q2 2026 Q2 2025 YOY Sales $2,681 $2,265 18% Adjusted EBITDA $273 $199 37% % of Sales Q2 2026 Q2 2025 bps fav / (unfav) Gross Profit 21.8% 20.9% 90 bps SG&A 11.6% 12.1% 50 bps Adjusted EBITDA 10.2% 8.8% 140 bps © 2026 Wesco International Second Quarter Drivers Record backlog up ~95% YOY, driven by strong growth in data center projects Record profitability with 10.2% adjusted EBITDA margin, marking the first double-digit EBITDA margin quarter in CSS history • Adjusted EBITDA increased 37%, and adjusted EBITDA margin expanded 140 bps to 10.2%, driven by gross margin expansion and operating cost leverage Reported and organic sales up 18% (volume +17%, price +1%) • Wesco Data Center Solutions (WDCS) sales increased ~45%, reflecting broad-based growth across the customer base • Enterprise Network Infrastructure (ENI) up LSD (up HSD including sales within WDCS), driven by service provider activity • Security up LSD (up HSD including sales within WDCS)

Actual 7 • Design Engineering of mission-critical HVAC Systems • In-House Fabrication and Assembly • Installation • After-Sales Servicing and support Key Capabilities Expanded end-to-end solutions capabilities for data center customers Acquired Newark Engineering Group; ~$60M in 2025 Sales • Adds mission-critical cooling and thermal management expertise • Provides customer engagement earlier in the data center lifecycle • Strengthens presence in the fast- growing Southeast Asia data center market • Creates attractive cross-selling opportunities and supports long-term margin expansion Strategic Rationale © 2026 Wesco International Newark Engineering Group acquisition closed on July 1, 2026.

See appendix for non-GAAP definitions and reconciliations. Numbers may not sum due to rounding. Record sales and profitability on accelerating business momentum Electrical and Electronic Solutions (EES) 8© 2026 Wesco International Q2 Results $ Millions Q2 2026 Q2 2025 YOY Sales $2,511 $2,258 11% Adjusted EBITDA $231 $183 27% % of Sales Q2 2026 Q2 2025 bps fav / (unfav) Gross Profit 24.4% 23.0% 140 bps SG&A 15.2% 14.9% (30) bps Adjusted EBITDA 9.2% 8.1% 110 bps Second Quarter Drivers Reported and organic sales up 11% (volume +6%, price +5%) • Construction up HSD, driven by infrastructure investment and data center project activity • Industrial up LSD, driven by improving MRO demand • OEM up over 20%, driven by strong demand across semiconductor, electrification and data center customers • Sales to data center customers increased over 70%, remaining a key growth driver across EES, with non-data center sales delivering solid HSD growth Record backlog up ~30% YOY, driven by strong double-digit growth in Industrial, OEM and Construction Record profitability on strong margin expansion to 9.2% adjusted EBITDA • Adjusted EBITDA increased 27%, and adjusted EBITDA margin expanded 110 basis points to 9.2%, reflecting significant gross margin expansion

Improving demand trends; record backlog driven by Grid Services wins Utility and Broadband Solutions (UBS) 9 See appendix for non-GAAP definitions and reconciliations. Numbers may not sum due to rounding. © 2026 Wesco International Q2 Results $ Millions Q2 2026 Q2 2025 YOY Sales $1,473 $1,377 7% Adjusted EBITDA $147 $144 2% % of Sales Q2 2026 Q2 2025 bps fav / (unfav) Gross Profit 17.6% 18.2% (60) bps SG&A 7.6% 7.7% 10 bps Adjusted EBITDA 10.0% 10.4% (40) bps Second Quarter Drivers Reported and organic sales up 7% (volume +4%, price +3%) • Utility up MSD driven by strong IOU performance, a significant increase in Grid Services activity, and improving Public Power trends • Broadband up mid-teens driven by project activity, customer share gains, and strength across both U.S. and Canadian operations Record backlog up ~80% YOY, driven by accelerating Grid Services adoption and strong underlying order activity Return to 10% adjusted EBITDA margin in Q2 • Return to adjusted EBITDA growth versus prior year • Competitive market dynamics within Public Power was a margin headwind in the second quarter, as expected

Supporting critical infrastructure across the power ecosystem Grid Services Expands UBS Data Center Power Participation 10© 2026 Wesco International Positioned to Support Growing Infrastructure Expanded Technical Capabilities Stronger Customer Relationships Larger Project Participation High-voltage expertise supporting complex infrastructure projects Trusted partner to utilities, data centers, EPCs and contractors Increasing share of large-scale power infrastructure projects Grid Services Applications 1. Data Centers 2. High-Voltage Industrial 3. Renewables 4. Utilities and Grid Infrastructure Customer Diversification Broader Scope of Supply Earlier Lifecycle Engagement to the rack and equipmentFrom the grid to the building Earlier and Deeper Data Center Participation Advisory and Engineering High-Voltage Infrastructure Supply Chain and Logistics

Data center sales continue to scale, representing greater than 20% on a TTM basis Data Center Sales Over $5B on TTM basis to the rack and equipmentFrom the grid to the building Holistic Power-to-Compute Solutions 11© 2026 Wesco International Time to Power (3-5 Years) Construction Period (1–2 Years) Up ~65% Up ~60% Up ~30% Up ~70% Up ~45% Q2 '25 Q3 '25 Q4 '25 Q1 '26 Q2' 26 Total Company Data Center Sales and YOY Growth Q2 2026: $1.5B Q2 2025: $1.0B Strategic Acquisitions Expanded Power-to-Compute Capabilities Rahi AscententroCIM Newark Engineering Hyperscale Solutions Building Intelligence Software Facility Services Cooling Solutions Enhanced End-to-End Data Center Capabilities 2022 2026 11© 2026 Wesco International

© 2026 Wesco International Data Center Product, Services and Solutions Offerings Providing holistic services and solutions for every phase of the data center lifecycle 12 White SpaceGray Space End-to-end electrical, automation and MRO capabilities Extensive next-generation infrastructure and services for always-on connectivity Physical Security, IoT, Pro A/V Access control, sensors and monitoring, video surveillance Electrical Infrastructure Building wire, cable trays, medium-voltage cable, switch gear, UPS systems MRO, Safety and Other Communication devices, janitorial, lighting, tools and equipment Mechanical and Cooling Automated switches and sensors, chillers, Computer Room Air Conditioning (CRAC), thermal IT Infrastructure Compute, network, storage, wireless technologies Communications Infrastructure Copper and fiber cabling systems, racks and enclosures, high-speed interconnects 80% 20% Wesco data center sales mix Data Center White Space Gray Space Global Ecosystem Expansive Portfolio Holistic Solutions Services and Solutions for Every Phase of the Data Center Lifecycle Installation Enhancement Rack and Roll Services Managed Services Project Deployment Services Advisory Services Grid Services OperationsPre-construction

$226 $32 $200 $(425) $(217) $277 $(28) Adjusted Net Income D&A and Other Accounts Receivable Inventory Accounts Payable Capex Free Cash Flow ¹ Represents a four-quarter average of net working capital as of September 30, December 31, March 31 and June 30 as a percentage of revenue for the twelve months ended June 30. See appendix for non-GAAP definitions and reconciliations. Delivered on free cash flow expectations for the first half of the year Free Cash Flow 13 14% of Adjusted Net Income Q2 2026 ($ Millions) Net Working Capital (NWC)¹ % of TTM Sales 20.5% 19.9% 20.3% 2024 2025 2026 © 2026 Wesco International

1 Bar sizes indicate the percentage of SBU sales of full year 2025. Raising growth expectations driven by accelerating business momentum 2026 Strategic Business Unit Sales Growth Drivers 14 Data Center expected to be up 30%+ (vs. up 20%+ prior) Construction Industrial OEM Utility Broadband Enterprise Network Infrastructure Security Data Center © 2026 Wesco International % of Wesco 2025 Sales 2026 Outlook SBU Sales Breakdown1 2026 Outlook Reported Sales Growth Reported Sales Growth Communication and Security Solutions 39% Up mid – high teens (Raised from Up LDD) Electrical and Electronic Solutions 38% Up HSD (Raised from Up MSD) Utility and Broadband Solutions 23% Up MSD (Raised from Up LSD - MSD)

15 Increasing full-year sales, adjusted EBITDA and adjusted EPS expectations Full-Year 2026 Outlook 2026 Underlying Assumptions • Cloud computing amortization and stock-based compensation are included in SG&A expense for adjusted EPS but are not included in adjusted EBITDA • Pricing is expected to contribute approximately 2 points to full-year sales growth • No changes to Federal Reserve interest rate policy expected in 2026 2026 Outlook April July Sales Organic sales growth 5% - 8% 9% - 11% Estimated M&A, Fx and workday impact ~1% ~1% Reported sales growth 6% - 9% 10% - 12% Reported sales $24.9 - $25.6 billion $25.9 - $26.3 billion Adjusted EBITDA Adjusted EBITDA margin 6.6% - 7.0% 6.9% - 7.1% Adjusted EPS Adjusted diluted EPS $15.00 - $17.00 $16.00 - $17.50 Cash Free cash flow $500 - $800 million $300 - $600 million FY 2026 April July Depreciation and Amortization ~$195-$205 ~$200-$210 Cloud Computing Amortization Expense Adjustment ~$50 ~$50 Stock Compensation Expense Adjustment ~$50 ~$70 Interest Expense ~$360-$375 ~$380-$390 Other Expense, net ~$10 ~$10 Capital Expenditures ~$100 ~$100 Share Count 49-49.5 ~49.5 Effective Tax Rate ~25%-26% (~26% in Q2-Q4) ~25% (~27% in Q3-Q4) 2026 Outlook Assumptions (millions, except effective tax rate) © 2026 Wesco International See appendix for non-GAAP definitions and reconciliations.

Exceptional start to Q3 with July preliminary sales per workday up high-teens Third Quarter 2026 Outlook 16 Q3 Outlook YOY Reported Sales Up LDD Adjusted EBITDA % Slightly lower sequentially 0% 5% 10% 15% 20% Apr 25 May 25 Jun 25 Jul 25 Aug 25 Sep 25 Oct 25 Nov 25 Dec 25 Jan 26 Feb 26 Mar 26 Apr 26 May 26 Jun 26 YOY Organic Sales Trends Q2-25 Q3-25 Q4-25 Q1-26 Q2-26 +7% +12% +9% +12% +13% © 2026 Wesco International

Second Quarter Highlights and Full Year Outlook 17 Market outperformance and exceptional Q2 results driven by accelerating business momentum. • Second quarter sales were a record at $6.7B, with reported and organic sales growth of 13% – Accelerating momentum across all three business units, with Q2 sales up 10% sequentially – Total company data center sales up ~45% • Backlog increased ~60% to a record level, driven by data center wins including significant Grid Services awards and improved demand across the diversified portfolio Record second quarter sales and backlog, up 13% and ~60% respectively, with growth across all three business units. • Record adjusted EBITDA of $487 million, up 24% versus prior year, with adjusted EBITDA margin expanding 60 basis points to 7.3% • Record adjusted EPS of $4.57, up 35% versus prior year • First-half free cash flow performance above expectations • Leverage ratio improved to 3.0x from 3.4x at 2025 year-end Record adjusted EBITDA up 24%, record adjusted EPS up 35% and positive free cash flow. • Momentum continues to build across the diversified portfolio, supporting increased outlook • Benefitting from multiple secular growth trends • Focused on continuing to deliver strong profitable growth and sustained outperformance Raising 2026 outlook, reflecting exceptional results in Q2 and increased outlook for the second half. See appendix for non-GAAP definitions and reconciliations. © 2026 Wesco International

($ Millions) Three Months Ended Growth/(Decline) June 30, 2026 June 30, 2025 Reported Sales Acquisition Foreign Exchange Workday Organic Sales EES $2,510.7 $2,257.8 11.2 % — % 0.3 % — % 10.9 % CSS 2,681.2 2,265.2 18.4 % — % 0.9 % — % 17.5 % UBS 1,473.2 1,376.6 7.0 % — % — % — % 7.0 % Total net sales $6,665.1 $5,899.6 13.0 % — % 0.4 % — % 12.6 % Organic Sales Growth Organic sales growth is a non-GAAP financial measure of sales performance. Organic sales growth is calculated by deducting the percentage impact from acquisitions and divestitures for one year following the respective transaction, fluctuations in foreign exchange rates and number of workdays from the reported percentage change in consolidated net sales. Workday impact represents the change in the number of operating days period-over-period after adjusting for weekends and public holidays in the United States. There was no change in the number of workdays in the second quarter of 2026 compared to the second quarter of 2025. The second quarter of 2026 had two more workdays compared to the first quarter of 2026. ($ Millions) Three Months Ended Growth/(Decline) June 30, 2026 March 31, 2026 Reported Sales Acquisition Foreign Exchange Workday Organic Sales EES $2,510.7 $2,244.2 11.9 % — % (0.3) % 3.2 % 9.0 % CSS 2,681.2 2,478.9 8.2 % — % (0.1) % 3.2 % 5.1 % UBS 1,473.2 1,357.0 8.6 % — % (0.1) % 3.2 % 5.5 % Total net sales $6,665.1 $6,080.1 9.6 % — % (0.2) % 3.2 % 6.6 % 20© 2026 Wesco International

Gross Profit ($ Millions) Three Months Ended June 30, 2026 June 30, 2025 Net sales $6,665.1 $5,899.6 Cost of goods sold (excluding depreciation and amortization) 5,209.1 4,656.9 Gross profit $1,456.0 $1,242.7 Gross margin 21.8 % 21.1 % Gross profit is a financial measure commonly used in the distribution industry. Gross profit is calculated by deducting cost of goods sold, excluding depreciation and amortization, from net sales. Gross margin is calculated by dividing gross profit by net sales. 21© 2026 Wesco International

Business Unit Gross Profit and Gross Margin Electrical and Electronic Solutions (EES) Three Months Ended Gross Profit: June 30, 2026 June 30, 2025 Net sales $2,510.7 $2,257.8 Cost of goods sold (excluding depreciation and amortization) 1,897.8 1,739.3 Gross profit $612.9 $518.5 Gross margin 24.4 % 23.0 % Gross profit is a financial measure commonly used in the distribution industry. Gross profit is calculated by deducting cost of goods sold, excluding depreciation and amortization, from net sales. Gross margin is calculated by dividing gross profit by net sales. Communications and Security Solutions (CSS) Three Months Ended Gross Profit: June 30, 2026 June 30, 2025 Net sales $2,681.2 $2,265.2 Cost of goods sold (excluding depreciation and amortization) 2,097.1 1,791.2 Gross profit $584.1 $474.0 Gross margin 21.8 % 20.9 % Utility and Broadband Solutions (UBS) Three Months Ended Gross Profit: June 30, 2026 June 30, 2025 Net sales $1,473.2 $1,376.6 Cost of goods sold (excluding depreciation and amortization) 1,214.2 1,126.4 Gross profit $259.0 $250.2 Gross margin 17.6 % 18.2 % ($ Millions) 22© 2026 Wesco International

Free Cash Flow ($ Millions) Three Months Ended Six Months Ended June 30, 2026 June 30, 2025 June 30, 2026 June 30, 2025 Cash flow provided by operations $53.7 $107.8 $275.1 $135.8 Less: Capital expenditures (28.2) (21.8) (51.6) (42.2) Add: Other adjustments 6.8 0.5 22.2 2.3 Free cash flow $32.3 $86.5 $245.7 $95.9 Percentage of adjusted net income 14.3 % 47.9 % 62.5 % 31.5 % Free cash flow is a non-GAAP financial measure of liquidity. Capital expenditures are deducted from operating cash flow to determine free cash flow. Free cash flow is available to fund investing and financing activities. For the three and six months ended June 30, 2026 and 2025, the Company paid for certain costs related to digital transformation and restructuring. Such expenditures have been added back to operating cash flow to determine free cash flow for such periods. Our calculation of free cash flow may not be comparable to similar measures used by other companies. 23© 2026 Wesco International

Net Working Capital - June 30, 2026 ($ Millions) As of Four-quarter Average as of September 30, 2025 December 31, 2025 March 31, 2026 June 30, 2026 June 30, 2026 Trade accounts receivable, net $4,204.2 $4,069.6 $4,273.1 $4,685.0 Inventories 4,059.1 4,008.8 4,213.1 4,418.0 Accounts payable 3,375.1 3,030.5 3,470.5 3,740.3 Net working capital $4,888.2 $5,047.9 $5,015.7 $5,362.7 $5,078.6 Three Months Ended Twelve Months Ended September 30, 2025 December 31, 2025 March 31, 2026 June 30, 2026 June 30, 2026 Net sales $6,199.1 $6,068.6 $6,080.1 $6,665.1 $25,012.9 Average net working capital % of TTM June 30, 2026 net sales 20.3 % Net working capital is a non-GAAP financial measure of short-term liquidity. Net working capital is calculated by subtracting accounts payable from the sum of trade accounts receivable, net and inventories. Net working capital represents our ability to fund our short-term operational expenses. Our calculation of net working capital may not be comparable to similar measures used by other companies. 24© 2026 Wesco International

Net Working Capital - June 30, 2025 ($ Millions) As of Four-quarter Average as of September 30, 2024 December 31, 2024 March 31, 2025 June 30, 2025 June 30, 2025 Trade accounts receivable, net $3,629.1 $3,454.4 $3,641.3 $3,942.8 Inventories 3,630.1 3,501.7 3,740.2 3,971.2 Accounts payable 2,839.1 2,670.6 3,025.8 3,291.4 Net working capital $4,420.1 $4,285.5 $4,355.7 $4,622.6 $4,421.0 Three Months Ended Twelve Months Ended September 30, 2024 December 31, 2024 March 31, 2025 June 30, 2025 June 30, 2025 Net sales $5,489.4 $5,499.7 $5,343.7 $5,899.6 $22,232.4 Average net working capital % of TTM June 30, 2025 net sales 19.9 % Net working capital is a non-GAAP financial measure of short-term liquidity. Net working capital is calculated by subtracting accounts payable from the sum of trade accounts receivable, net and inventories. Net working capital represents our ability to fund our short-term operational expenses. Our calculation of net working capital may not be comparable to similar measures used by other companies. 25© 2026 Wesco International

Net Working Capital - June 30, 2024 ($ Millions) As of Four-quarter Average as of September 30, 2023 December 31, 2023 March 31, 2024 June 30, 2024 June 30, 2024 Trade accounts receivable, net $3,795.0 $3,639.5 $3,526.7 $3,654.6 Inventories 3,541.4 3,572.1 3,525.4 3,505.8 Accounts payable 2,650.0 2,431.5 2,974.3 2,688.9 Net working capital $4,686.4 $4,780.1 $4,077.8 $4,471.5 $4,504.0 Three Months Ended Twelve Months Ended September 30, 2023 December 31, 2023 March 31, 2024 June 30, 2024 June 30, 2024 Net sales $5,644.4 $5,473.4 $5,350.0 $5,479.7 $21,947.5 Average net working capital % of TTM June 30, 2024 net sales 20.5 % Net working capital is a non-GAAP financial measure of short-term liquidity. Net working capital is calculated by subtracting accounts payable from the sum of trade accounts receivable, net and inventories. Net working capital represents our ability to fund our short-term operational expenses. Our calculation of net working capital may not be comparable to similar measures used by other companies. 26© 2026 Wesco International

Adjusted EBITDA – 2Q 2026 ($ Millions) Three Months Ended June 30, 2026 EES CSS UBS Corporate Total Net income attributable to common stockholders $204.1 $232.2 $136.8 $(364.1) $209.0 Net income (loss) attributable to noncontrolling interests 0.2 0.6 — (0.2) 0.6 Provision for income taxes(1) — — — 62.4 62.4 Interest expense, net(1) — — — 110.4 110.4 Depreciation and amortization 13.7 19.8 9.1 8.5 51.1 EBITDA $218.0 $252.6 $145.9 $(183.0) $433.5 Other expense (income), net 12.6 18.7 — (31.5) (0.2) Stock-based compensation expense 0.7 1.6 0.9 15.9 19.1 Digital transformation costs(2) — — — 23.2 23.2 Cloud computing arrangement amortization(3) — — — 11.6 11.6 Adjusted EBITDA $231.3 $272.9 $146.8 $(163.8) $487.2 Adjusted EBITDA margin % 9.2 % 10.2 % 10.0 % 7.3 % (1) The reportable segments do not incur income taxes and interest expense as these costs are centrally controlled through the Corporate tax and treasury functions. (2) Digital transformation costs include costs associated with certain digital transformation initiatives. (3) Cloud computing arrangement amortization consists of expense recognized in selling, general and administrative expenses for capitalized implementation costs for cloud computing arrangements to support our digital transformation initiatives. EBITDA, adjusted EBITDA and adjusted EBITDA margin % are non-GAAP financial measures that provide indicators of the Company's performance and its ability to meet debt service requirements. For the three months ended June 30, 2026, adjusted EBITDA is defined as earnings before interest, taxes, depreciation and amortization before other non-operating expenses (income), non-cash stock-based compensation expense, digital transformation costs, and cloud computing arrangement amortization. 27© 2026 Wesco International EBITDA and Adjusted EBITDA by Segment

Adjusted EBITDA – 2Q 2025 ($ Millions) Three Months Ended June 30, 2025 EES CSS UBS Corporate Total Net income attributable to common stockholders $162.1 $162.1 $137.8 $(272.8) $189.2 Net income (loss) attributable to noncontrolling interests 0.1 0.6 — (0.4) 0.3 Gain on redemption of Series A Preferred Stock — — — (27.6) (27.6) Preferred stock dividends — — — 12.9 12.9 Provision for income taxes(1) — — — 61.8 61.8 Interest expense, net(1) — — — 92.9 92.9 Depreciation and amortization 12.4 19.1 7.6 9.2 48.3 EBITDA $174.6 $181.8 $145.4 $(124.0) $377.8 Other expense (income), net 7.3 15.7 (2.2) (28.1) (7.3) Stock-based compensation expense 1.0 1.4 0.5 5.5 8.4 Digital transformation costs(2) — — — 7.6 7.6 Cloud computing arrangement amortization(3) — — — 7.2 7.2 Restructuring costs(4) — — — 0.5 0.5 Adjusted EBITDA $182.9 $198.9 $143.7 $(131.3) $394.2 Adjusted EBITDA margin % 8.1 % 8.8 % 10.4 % 6.7 % (1) The reportable segments do not incur income taxes and interest expense as these costs are centrally controlled through the Corporate tax and treasury functions. (2) Digital transformation costs include costs associated with certain digital transformation initiatives. (3) Cloud computing arrangement amortization consists of expense recognized in selling, general and administrative expenses for capitalized implementation costs for cloud computing arrangements to support our digital transformation initiatives. (4) Restructuring costs include severance costs incurred pursuant to an ongoing restructuring plan. EBITDA, adjusted EBITDA and adjusted EBITDA margin % are non-GAAP financial measures that provide indicators of the Company's performance and its ability to meet debt service requirements. For the three months ended June 30, 2025, adjusted EBITDA is defined as earnings before interest, taxes, depreciation and amortization before other non-operating expenses (income), non-cash stock-based compensation expense, digital transformation costs, cloud computing arrangement amortization, and restructuring costs. EBITDA and Adjusted EBITDA by Segment 28© 2026 Wesco International

Adjusted SG&A - EBITDA - QTD ($ Millions) Three Months Ended June 30, 2026 EES CSS UBS Corporate Total Adjusted SG&A expenses for EBITDA: SG&A expenses $382.3 $312.8 $113.1 $214.5 $1,022.7 Stock-based compensation expense (0.7) (1.6) (0.9) (15.9) (19.1) Digital transformation costs(1) — — — (23.2) (23.2) Cloud computing arrangement amortization(2) — — — (11.6) (11.6) Adjusted SG&A expenses - EBITDA $381.6 $311.2 $112.2 $163.8 $968.8 Percentage of net sales 15.2 % 11.6 % 7.6 % 14.5 % ($ Millions) Three Months Ended June 30, 2025 EES CSS UBS Corporate Total Adjusted SG&A expenses for EBITDA: SG&A expenses $336.5 $276.6 $107.0 $152.1 $872.2 Stock-based compensation expense (1.0) (1.4) (0.5) (5.5) (8.4) Digital transformation costs(1) — — — (7.6) (7.6) Cloud computing arrangement amortization(2) — — — (7.2) (7.2) Restructuring costs(3) — — — (0.5) (0.5) Adjusted SG&A expenses - EBITDA $335.5 $275.2 $106.5 $131.3 $848.5 Percentage of net sales 14.9 % 12.1 % 7.7 % 14.4 % (1) Digital transformation costs include costs associated with certain digital transformation initiatives. (2) Cloud computing arrangement amortization consists of expense recognized in SG&A expense for capitalized implementation costs for cloud computing arrangements to support our digital transformation initiatives. (3) Restructuring costs include severance costs incurred pursuant to an ongoing restructuring plan. For the three months ended June 30, 2026, adjusted SG&A expenses for EBITDA is defined as SG&A expenses before non-cash stock-based compensation expense, digital transformation costs, and cloud computing arrangement amortization. For the three months ended June 30, 2025, adjusted SG&A expenses for EBITDA is defined as SG&A expenses before non-cash stock-based compensation expense, digital transformation costs, cloud computing arrangement amortization, and restructuring costs. 29© 2026 Wesco International

Adjusted SG&A, Income from Operations, Provision for Income Taxes, and Net Income Attributable to Common Stockholders ($ Millions) Three Months Ended June 30, 2026 June 30, 2025 Adjusted SG&A Expenses: SG&A Expenses $1,022.7 $872.2 Digital transformation costs(1) (23.2) (7.6) Restructuring costs(2) — (0.5) Adjusted SG&A expenses $999.5 $864.1 Percentage of net sales 15.0 % 14.6 % Adjusted Income from Operations: Income from operations $382.2 $322.2 Digital transformation costs(1) 23.2 7.6 Restructuring costs(2) — 0.5 Adjusted income from operations $405.4 $330.3 Adjusted income from operations margin % 6.1 % 5.6 % Adjusted Provision for Income Taxes: Provision for income taxes $62.4 $61.8 Income tax effect of adjustments to income from operations(3) 6.6 2.2 Adjusted provision for income taxes $69.0 $64.0 Adjusted Net Income Attributable to Common Stockholders: Net income attributable to common stockholders $209.0 $189.2 Digital transformation costs(1) 23.2 7.6 Restructuring costs(2) — 0.5 Income tax effect of adjustments to income from operations(3) (6.6) (2.2) Gain on redemption of Series A Preferred Stock — (27.6) Adjusted net income attributable to common stockholders $225.6 $167.5 (1) Digital transformation costs include costs associated with certain digital transformation initiatives. (2) Restructuring costs include severance costs incurred pursuant to an ongoing restructuring plan. (3) The adjustments to Income from operations have been tax effected at rates of 28.4% and 26.3% for the three months ended June 30, 2026 and 2025, respectively. 30© 2026 Wesco International

Adjusted Earnings Per Diluted Share ($ Millions, except for per share data) Three Months Ended June 30, 2026 June 30, 2025 Adjusted income from operations $405.4 $330.3 Interest expense, net 110.4 92.9 Other income, net (0.2) (7.3) Adjusted income before income taxes 295.2 244.7 Adjusted provision for income taxes 69.0 64.0 Adjusted net income 226.2 180.7 Net income attributable to noncontrolling interests 0.6 0.3 Adjusted net income attributable to WESCO International, Inc. 225.6 180.4 Preferred stock dividends — 12.9 Adjusted net income attributable to common stockholders $225.6 $167.5 Diluted shares 49.4 49.4 Adjusted earnings per diluted share $4.57 $3.39 For the three months ended June 30, 2026, SG&A expenses, income from operations, provision for income taxes, net income attributable to common stockholders and earnings per diluted share have been adjusted to exclude digital transformation costs and the related income tax effects. For the three months ended June 30, 2025, SG&A expenses, income from operations, the provision for income taxes, net income attributable to common stockholders and earnings per diluted share have been adjusted to exclude digital transformation costs, restructuring costs, and the related income tax effects, and the gain on redemption of the Company's Series A Preferred Stock. These non-GAAP financial measures provide a better understanding of our financial results on a comparable basis. 31© 2026 Wesco International

Financial Leverage ($ Millions, except ratios) Twelve Months Ended June 30, 2026 December 31, 2025 Net income attributable to common stockholders $715.5 $645.8 Net income attributable to noncontrolling interests 3.0 2.3 Gain on redemption of Series A Preferred Stock (5.3) (32.9) Preferred stock dividends — 27.3 Provision for income taxes 221.0 213.4 Interest expense, net 414.5 386.7 Depreciation and amortization 202.6 197.6 EBITDA $1,551.3 $1,440.2 Other income, net (3.1) (9.6) Stock-based compensation expense 57.1 40.5 Digital transformation costs(1) 62.1 35.2 Cloud computing arrangement amortization(2) 41.8 30.2 Restructuring costs(3) (1.6) — Adjusted EBITDA $1,707.6 $1,536.5 As of June 30, 2026 December 31, 2025 Short-term debt and current portion of long-term debt, net $25.0 $25.0 Long-term debt, net 5,911.1 5,756.4 Debt discount and debt issuance costs(4) 49.8 48.0 Total debt 5,985.9 5,829.4 Less: Cash and cash equivalents 808.9 604.8 Total debt, net of cash $5,177.0 $5,224.6 Financial leverage ratio 3.0 3.4 (1) Digital transformation costs include costs associated with certain digital transformation initiatives. (2) Cloud computing arrangement amortization consists of expense recognized in selling, general and administrative expenses for capitalized implementation costs for cloud computing arrangements to support our digital transformation initiatives. (3) Reduction to restructuring costs represents the reversal of certain severance costs previously incurred pursuant to an ongoing restructuring plan. (4) Debt is presented in the Condensed Consolidated Balance Sheets net of debt discount and debt issuance costs. Financial leverage ratio is a non-GAAP measure of the use of debt. Financial leverage ratio is calculated by dividing total debt, excluding debt issuance costs, and debt discount, net of cash, by adjusted EBITDA. EBITDA is defined as the trailing twelve months earnings before interest, taxes, depreciation and amortization. Adjusted EBITDA is defined as the trailing twelve months EBITDA before other non-operating income, non-cash stock-based compensation expense, digital transformation costs, cloud computing arrangement amortization, and restructuring costs. 32© 2026 Wesco International

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Jul. 30, 2026

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