Form 8-K

8-K — A10 Networks, Inc.

Accession: 0001580808-26-000023

Filed: 2026-04-28

Period: 2026-04-28

CIK: 0001580808

SIC: 3576 (COMPUTER COMMUNICATIONS EQUIPMENT)

Item: Results of Operations and Financial Condition

Item: Regulation FD Disclosure

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — aten-20260428.htm (Primary)

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8-K

8-K (Primary)

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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

April 28, 2026

Date of Report (Date of earliest event reported)

____________________________________________________________________________

A10 NETWORKS, INC.

(Exact name of the registrant as specified in its charter)

____________________________________________________________________________

Delaware 001-36343 20-1446869

(State or Other Jurisdiction of Incorporation or Organization) (Commission File Number) (I.R.S. Employer Identification Number)

2300 Orchard Parkway

San Jose, CA 95131

(Address of principal executive offices, including zip code)

(408) 325-8668

(Name and telephone number, including area code, of the person to contact in connection with this report)

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 (see General Instruction A.2. below):

☐ 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, $0.00001 par value per share ATEN 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

On April 28, 2026, A10 Networks, Inc. (the “Company”) issued a press release regarding financial results for the quarter ended March 31, 2026. A copy of the press release is furnished herewith as Exhibit 99.1.

Item 7.01 Regulation FD Disclosure

On April 28, 2026, the Company posted on its website (www.a10networks.com) slides regarding the financial results for the quarter ended March 31, 2026. A copy of the slides is furnished herewith as Exhibit 99.2.

The information in Item 2.02, Item 7.01 and Item 9.01 in this Current Report on Form 8-K and the exhibits attached hereto shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended ("Exchange Act"), or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act. The information in Item 2.02 shall not be incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 8.01 Other Events.

On April 28, 2026, the Company announced that its Board of Directors (the “Board”) approved a quarterly dividend. The quarterly dividend, in the amount of $0.06 per share, will be payable, subject to any prior revocation, on June 1, 2026 to stockholders of record on May 15, 2026. Future dividends will be subject to further review and approval by the Board in accordance with applicable law. The Board reserves the right to adjust or withdraw the quarterly dividend in future periods as it reviews the Company’s capital allocation strategy from time-to-time.

Forward Looking Statements

This Current Report on Form 8-K contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act. These forward-looking statements involve risks and uncertainties. These forward-looking statements may be identified by terms such as “will,” “may,” “plans,” or the negative of these terms, and similar expressions intended to identify forward-looking statements. These forward-looking statements include, but are not limited to, statements regarding the anticipated amount, duration, methods, timing, term and other aspects of our dividend program and any anticipated benefits or value resulting from such program. These statements involve known and unknown risks, uncertainties and other factors which may cause actual results, performance or achievements to differ materially from those expressed or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to, any unforeseen need for capital which may require us to divert funds we may have otherwise used for the dividend program, which may in turn negatively impact our ability to administer the quarterly dividends. In addition, the timing and amount of future dividends, if any, will be made as management deems appropriate and will depend on a variety of factors including stock price, market conditions, corporate and regulatory requirements (including applicable securities laws and regulations and the rules of The New York Stock Exchange), any additional constraints related to material inside information the Company may possess, and capital availability. More information regarding these and other risks, uncertainties and factors is contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, as filed with the Securities and Exchange Commission ("SEC") on February 25, 2026, and in other reports filed by the Company with the SEC from time to time. You are cautioned not to unduly rely on these forward-looking statements, which speak only as of the date of this Current Report. All information in this Current Report and its attachments is as of the date stated and unless required by law, the Company undertakes no obligation to update or publicly revise any forward-looking statement to reflect circumstances or events after the date of this Current Report or to report the occurrence of unanticipated events other than as required by law or regulation.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits

Exhibit Description

99.1

Press release dated April 28, 2026.

99.2

Slides of A10 Networks, Inc. dated April 28, 2026, regarding financial results of the first quarter ended March 31, 2026.

104.1 Cover Page Interactive Data File (embedded within the inline XBRL document).

SIGNATURE

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.

Date: April 28, 2026

A10 NETWORKS, INC.

By: /s/ Michelle Caron

Michelle Caron

Chief Financial Officer (Principal Accounting and Financial Officer)

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Document

EXHIBIT 99.1

A10 Networks Reports Financial Results for the First Quarter of 2026

Strong Demand for AI Infrastructure Drives 13.4% Revenue Growth

SAN JOSE, Calif., April 28, 2026 -- A10 Networks, Inc. (NYSE: ATEN), a leading provider of secure application services and solutions, today announced financial results for its first quarter ended March 31, 2026.

First Quarter 2026 Financial Summary

•Quarterly revenue of $75.0 million (up 13.4% year-over-year).

•GAAP gross margin of 79.6%; non-GAAP gross margin of 80.6%.

•GAAP net income of $12.0 million, or $0.17 per diluted share, non-GAAP net income of $17.7 million, or $0.24 per diluted share.

•Non-GAAP Adjusted EBITDA of $22.5 million, representing 30.0% of revenue.

•The Company returned $6.8 million to investors, having repurchased 137,000 shares during the quarter at an average price of $18.13 per share for a total of $2.5 million and having paid $4.3 million in cash dividends in the quarter.

•The Board of Directors approved a quarterly cash dividend of $0.06 per share, payable June 1, 2026 to stockholders of record at the close of business on May 15, 2026.

•As of March 31, 2026, A10 had $369.8 million in cash, cash equivalents, and marketable securities.

A reconciliation between GAAP and non-GAAP information is contained in the financial statements below.

“AI-driven architectures are fundamentally increasing the volume, velocity, and complexity of network traffic, placing new demands on performance, availability, and security,” said Dhrupad Trivedi, President and Chief Executive Officer of A10 Networks. “AI is architecturally making the distinction between Enterprises and Service Providers obsolete, as the workloads and requirements are the same. A10 sits at a critical control point at the intersection of performance and security. Our investments and innovation focus have continued to drive strong demand resulting in expanded commitments from our top customers scaling AI infrastructure deployments.”

“Our model has continued to translate growth into increased profitability,” continued Trivedi. “We're actively managing industry-wide input supply dynamics for certain components, turning these challenges into growth opportunities. We remain confident to deliver full-year expectations for operating cash flow as first quarter results were impacted by routine time shifts. We believe our powerful combination of growth momentum, disciplined execution, and agile strategy positions us to drive strong financial performance. This is currently expected to continue to support the return of capital to our shareholders while we invest in innovation to help maintain our strategic advantages.”

Outlook

For 2026, A10 management reiterates their previous guidance given at their February Investor Day. Management currently expects:

•Full-year revenue growth of 10-12% over the prior year

•Adjusted EBITDA margin of between 28-30%

•EPS growth exceeding revenue growth rate, representing 12-14% growth year-over-year

Conference Call

Management will host a call at 1:30 p.m. Pacific time (4:30 p.m. Eastern time) today, April 28, 2026, to discuss these results. Interested parties may access the conference call by dialing (888) 506-0062 (toll-free) or (973) 528-0011 (international) and referencing access code: 360454.

A live audio webcast of the conference call will be accessible from the “Investor Relations” section of A10 Network’s website at investors.a10networks.com. The webcast will be archived for one year. A telephonic replay of the conference call will be available until May 12, 2026 and may be accessed by dialing (877) 481-4010 (toll-free) or (919) 882-2331 (international) and entering the passcode: 53873.

Forward-Looking Statements

This press release contains “forward-looking statements,” including statements regarding dividends and capital return, demand and market trends, strategy and competitive positioning, financial performance and profitability, supply chain management, and 2026 financial guidance. Forward-looking statements are subject to known and unknown risks and uncertainties and are based on assumptions that may prove to be incorrect, which could cause actual results to differ materially from those expected or implied by the forward-looking statements. Factors that may cause actual results to differ include any unforeseen need for capital which may require us to divert funds we may have otherwise used for the dividend program or stock repurchase program, which may in turn negatively impact our ability to administer the quarterly dividends or the repurchase of our common stock; a significant decline in global macroeconomic or political conditions that have an adverse impact on our business and financial results; an expansion of adversarial global trade dynamics or other changes to international trade regulations; business interruptions related to our supply chain; our ability to manage our business and expenses if customers cancel or delay orders; execution risks related to closing key deals and improving our execution; the continued market adoption of our products; our ability to successfully anticipate market needs and opportunities; our timely development of new products and features; our ability to achieve or maintain profitability; any loss or delay of expected purchases by our largest end-customers; our ability to maintain or improve our competitive position; competitive and execution risks related to cloud-based computing trends; our ability to attract and retain new end-customers and our largest end-consumers; our ability to maintain and enhance our brand and reputation; changes demanded by our customers in the deployment and payment model for our products; continued growth rates in markets relating to network security; the success of any future acquisitions or investments in complementary companies, products, services or technologies; the ability of our sales team to execute well; our ability to shorten our close cycles; the ability of our channel partners to sell our products; variations in product mix or geographic locations of our sales; risks associated with our presence in international markets; weaknesses or deficiencies in our internal control over financial reporting; our ability to timely file periodic reports required to be filed under the Securities Exchange Act of 1934; and other risks that are described in “Risk Factors” in our periodic filings with the Securities and Exchange Commission, including our Form 10-K filed with the Securities and Exchange Commission on February 25, 2026. We do not intend to update or alter our forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

Non-GAAP Financial Measures

In addition to disclosing financial measures prepared in accordance with U.S. generally accepted accounting principles (GAAP), we refer to certain non-GAAP financial measures, including non-GAAP net income, non-GAAP net income per basic and diluted share (or non-GAAP EPS), non-GAAP gross profit and gross margin, non-GAAP operating expenses, non-GAAP operating income and operating margin, Adjusted EBITDA and Adjusted EBITDA margin. Non-GAAP financial measures do not have any standardized meaning and are therefore unlikely to be comparable to similarly titled measures presented by other companies.

A10 Networks considers these non-GAAP financial measures to be important because they provide useful measures of the operating performance of the company by excluding certain items that, while they may recur, can vary significantly in amount and timing or are not directly indicative of ongoing operational trends, and are used by the company’s management to evaluate operating performance, prepare budgets and forecasts, and assess performance relative to peer companies.

Non-GAAP financial measures should not be considered in isolation from, or as a substitute for, financial information prepared in accordance with GAAP.

We define non-GAAP net income as our GAAP net income excluding: (i) stock-based compensation and related payroll tax, (ii) acquisition-related expense, (iii) amortization of acquired intangible assets, (iv) amortization of debt issuance costs, (v) certain legal expense and (vi) income tax effect of non-GAAP items (i) to (v) listed above. We define non-GAAP net income per basic and diluted share as our non-GAAP net income divided by our basic and diluted weighted-average shares outstanding. We define non-GAAP gross profit as our GAAP gross profit excluding (i) stock-based compensation and related payroll tax and (ii) amortization of acquired intangible assets. We define non-GAAP gross margin as our non-GAAP gross profit divided by our GAAP revenue. We define non-GAAP operating expenses as our GAAP operating expenses excluding (i) stock-based compensation and related payroll tax, (ii) acquisition-related expense, (iii) amortization of acquired intangible assets and (iv) certain legal expense. We define non-GAAP operating income as our GAAP income from operations excluding (i) stock-based compensation and related payroll tax, (ii) acquisition-related expense, (iii) amortization of acquired intangible assets

and (iv) certain legal expense. We define non-GAAP operating margin as our non-GAAP operating income divided by our GAAP revenue. We define Adjusted EBITDA as our GAAP net income excluding (i) interest and other income, net, (ii) depreciation and amortization expense, (iii) provision for income taxes, (iv) stock-based compensation and related payroll tax, (v) acquisition-related expense and (vi) certain legal expense. We define Adjusted EBITDA margin as our Adjusted EBITDA divided by our GAAP revenue.

Non-GAAP financial measures are presented for supplemental informational purposes only for understanding the company's operating results.

About A10 Networks

A10 Networks (NYSE: ATEN) delivers secure application and network solutions that protect, optimize, and scale business-critical systems across on-premises, hybrid cloud, and edge environments. Our portfolio enables large enterprises, service providers, and cloud platforms worldwide to deliver performance, reliability, and protection against cyber threats, while preparing their networks for the demands of AI and next-generation applications. Founded in 2004 and headquartered in San Jose, California, A10 Networks serves over 7,000 global customers. For more information, visit A10networks.com and follow us at A10Networks.

The A10 logo and A10 Networks are trademarks or registered trademarks of A10 Networks, Inc. in the United States and other countries. All other trademarks are the property of their respective owners.

Investor Contact:

Rob Fink / Tom Baumann

FNK IR

646.809.4048 / 646.349.6641

aten@fnkir.com

David Schroeder

VP, Corporate Development

investors@a10networks.com

Source: A10 Networks, Inc.

A10 NETWORKS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited, in thousands, except per share amounts, on a GAAP Basis)

Three Months Ended March 31,

2026 2025

Net revenue:

Products $ 43,986 $ 35,979

Services 31,014 30,158

Total net revenue 75,000 66,137

Cost of net revenue:

Products 8,930 7,263

Services 6,346 6,179

Total cost of net revenue 15,276 13,442

Gross profit 59,724 52,695

Operating expenses:

Sales and marketing 20,014 19,545

Research and development 19,018 15,900

General and administrative 7,693 8,472

Total operating expenses 46,725 43,917

Income from operations 12,999 8,778

Non-operating income (expense):

Interest income 3,383 1,790

Interest and other income (expense), net (2,158) (90)

Total non-operating income, net 1,225 1,700

Income before income taxes 14,224 10,478

Provision for income taxes 2,192 935

Net income $ 12,032 $ 9,543

Net income per share:

Basic $ 0.17 $ 0.13

Diluted $ 0.17 $ 0.13

Weighted-average shares used in computing net income per share:

Basic 71,667 73,555

Diluted 72,915 75,048

A10 NETWORKS, INC.

RECONCILIATION OF GAAP NET INCOME TO NON-GAAP NET INCOME

(unaudited, in thousands, except per share amounts)

Three Months Ended March 31,

2026 2025

GAAP net income $ 12,032 $ 9,543

Non-GAAP items:

Stock-based compensation and related payroll tax 5,050 6,292

Acquisition-related expense — 344

Amortization of acquired intangible assets 379 203

Amortization of debt issuance costs 365 —

Certain legal expense 497 526

Income tax-effect of non-GAAP items (592) (1,873)

Total non-GAAP items 5,699 5,492

Non-GAAP net income $ 17,731 $ 15,035

GAAP net income per share:

Basic $ 0.17 $ 0.13

Diluted $ 0.17 $ 0.13

Non-GAAP items:

Stock-based compensation and related payroll tax 0.07 0.08

Acquisition-related expense — —

Amortization of acquired intangible assets 0.01 —

Amortization of debt issuance costs — —

Certain legal expense 0.01 0.01

Income tax-effect of non-GAAP items (0.01) (0.02)

Total non-GAAP items 0.08 0.07

Non-GAAP net income per share:

Basic $ 0.25 $ 0.20

Diluted $ 0.24 $ 0.20

Weighted average shares used in computing net income per share:

Basic 71,667 73,555

Diluted 72,915 75,048

Net income and earnings per share excluding adjustments are non-GAAP financial measures presented as supplemental financial measures to enable a user of the financial information to understand the impact of these adjustments on reported results and to facilitate comparison of operating results across reporting periods. These financial measures should not be considered an alternative to net income, operating income, cash flows provided by operating activities, or any other measure of financial performance or liquidity presented in accordance with U.S. GAAP. Our adjusted net income and earnings per share may not be comparable to similarly titled measures of another company because companies may not all calculate adjusted net income and earnings per share in the same manner.

A10 NETWORKS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited, in thousands, except par value, on a GAAP Basis)

As of March 31, 2026 As of December 31, 2025

ASSETS

Current assets:

Cash and cash equivalents $ 57,895 $ 71,139

Marketable securities 311,867 306,714

Accounts receivable, net of allowances of $46 and $66, respectively 69,003 62,069

Inventory 20,172 18,032

Prepaid expenses and other current assets 20,611 18,000

Total current assets 479,548 475,954

Property and equipment, net 51,972 50,221

Goodwill 15,134 15,134

Intangible assets, net 5,879 6,259

Deferred tax assets, net 63,034 62,109

Other non-current assets 18,853 20,136

Total assets $ 634,420 $ 629,813

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current liabilities:

Accounts payable $ 14,078 $ 11,694

Accrued and other liabilities 30,740 41,132

Deferred revenue, current 84,298 80,824

Total current liabilities 129,116 133,650

Deferred revenue, non-current 62,864 61,982

Long-term debt 219,153 218,787

Other non-current liabilities 2,450 3,848

Total liabilities 413,583 418,267

Stockholders' equity:

Common stock, $0.00001 par value: 500,000 shares authorized; 92,395 and 91,996 shares issued and 71,759 and 71,498 shares outstanding, respectively 1 1

Treasury stock, at cost: 20,636 and 20,498 shares, respectively (252,408) (249,912)

Additional paid-in-capital 536,611 531,790

Dividends paid (77,089) (72,785)

Accumulated other comprehensive income (expense) (103) 659

Retained earnings 13,825 1,793

Total stockholders' equity 220,837 211,546

Total liabilities and stockholders' equity $ 634,420 $ 629,813

A10 NETWORKS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited, in thousands, on a GAAP Basis)

Three Months Ended March 31,

2026 2025

Cash flows from operating activities:

Net income $ 12,032 $ 9,543

Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation and amortization 3,969 3,396

Stock-based compensation 4,821 6,018

Other non-cash items 716 1,237

Changes in operating assets and liabilities:

Accounts receivable (6,974) 10,543

Inventory (2,147) 1,152

Prepaid expenses and other assets (3,654) (2,896)

Accounts payable 902 (5,646)

Accrued and other liabilities (11,790) (8,175)

Deferred revenue 4,356 2,032

Net cash provided by operating activities 2,231 17,204

Cash flows from investing activities:

Proceeds from sales and maturities of marketable securities 58,525 30,744

Purchases of marketable securities (64,282) (41,896)

Acquisition — (19,100)

Capital expenditures (2,920) (4,494)

Net cash used in investing activities (8,677) (34,746)

Cash flows from financing activities:

Proceeds from the issuance of convertible notes — 225,000

Payment of debt issuance costs — (7,277)

Repurchase of common stock (2,495) (47,030)

Payments for dividends (4,303) (4,434)

Net cash provided by (used in) financing activities (6,798) 166,259

Net increase (decrease) in cash and cash equivalents (13,244) 148,717

Cash and cash equivalents—beginning of period 71,139 95,129

Cash and cash equivalents—end of period $ 57,895 $ 243,846

Non-cash investing and financing activities:

Transfers between inventory and property and equipment $ 7 $ 314

Capital expenditures included in accounts payable $ 1,482 $ 193

Supplemental cash flow disclosure:

Cash paid for income taxes, net $ 111 $ 5

Cash paid for interest on debt $ 3,094 $ —

A10 NETWORKS, INC.

RECONCILIATION OF GAAP GROSS PROFIT TO NON-GAAP GROSS PROFIT

(unaudited, in thousands, except percentages)

Three Months Ended March 31,

2026 2025

GAAP gross profit $ 59,724 $ 52,695

GAAP gross margin 79.6 % 79.7 %

Non-GAAP adjustments:

Stock-based compensation and related payroll tax 409 646

Amortization of acquired intangible assets 281 150

Non-GAAP gross profit $ 60,414 $ 53,491

Non-GAAP gross margin 80.6 % 80.9 %

A10 NETWORKS, INC.

RECONCILIATION OF GAAP TOTAL OPERATING EXPENSES

TO NON-GAAP TOTAL OPERATING EXPENSES

(unaudited, in thousands)

Three Months Ended March 31,

2026 2025

GAAP total operating expenses $ 46,725 $ 43,917

Non-GAAP adjustments:

Stock-based compensation and related payroll tax (4,641) (5,646)

Acquisition-related expense — (344)

Amortization of acquired intangible assets (98) (53)

Certain legal expense (497) (526)

Non-GAAP total operating expenses $ 41,489 $ 37,348

A10 NETWORKS, INC.

RECONCILIATION OF GAAP INCOME FROM OPERATIONS

TO NON-GAAP OPERATING INCOME

(unaudited, in thousands, except percentages)

Three Months Ended March 31,

2026 2025

GAAP income from operations $ 12,999 $ 8,778

GAAP operating margin 17.3 % 13.3 %

Non-GAAP adjustments:

Stock-based compensation and related payroll tax 5,050 6,292

Acquisition-related expense — 344

Amortization of acquired intangible assets 379 203

Certain legal expense 497 526

Non-GAAP operating income $ 18,925 $ 16,143

Non-GAAP operating margin 25.2 % 24.4 %

A10 NETWORKS, INC.

RECONCILIATION OF GAAP NET INCOME TO

EBITDA AND ADJUSTED EBITDA (NON-GAAP)

(unaudited, in thousands, except percentages)

Three Months Ended March 31,

2026 2025

GAAP net income $ 12,032 $ 9,543

GAAP net income margin 16.0 % 14.4 %

Exclude: Interest and other income, net (1,225) (1,700)

Exclude: Depreciation and amortization 3,969 3,599

Exclude: Provision for income taxes 2,192 935

EBITDA 16,968 12,377

Exclude: Stock-based compensation and related payroll tax 5,050 6,292

Exclude: Acquisition-related expense — 344

Exclude: Certain legal expense 497 526

Adjusted EBITDA $ 22,515 $ 19,539

Adjusted EBITDA margin 30.0 % 29.5 %

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Q1 2026 Financial Results and Commentary April 28, 2026

Cautionary Statements & Disclosures This presentation and the accompanying oral presentation contain “forward-looking” statements that are based on our management’s beliefs and assumptions, including statements regarding dividends and capital return, demand and market trends, strategy and competitive positioning, financial performance and profitability, supply chain management, and 2026 financial guidance. Forward-looking statements are subject to known and unknown risks and uncertainties and are based on assumptions that may prove to be incorrect, which could cause actual results to differ materially from those expected or implied by the forward-looking statements. Factors that may cause actual results to differ include any unforeseen need for capital which may require us to divert funds we may have otherwise used for the dividend program or stock repurchase program, which may in turn negatively impact our ability to administer the quarterly dividends or the repurchase of our common stock; a significant decline in global macroeconomic or political conditions that have an adverse impact on our business and financial results; an expansion of adversarial global trade dynamics or other changes to international trade regulations; business interruptions related to our supply chain; our ability to manage our business and expenses if customers cancel or delay orders; execution risks related to closing key deals and improving our execution; the continued market adoption of our products; our ability to successfully anticipate market needs and opportunities; our timely development of new products and features; our ability to achieve or maintain profitability; any loss or delay of expected purchases by our largest end-customers; our ability to maintain or improve our competitive position; competitive and execution risks related to cloud-based computing trends; our ability to attract and retain new end-customers and our largest end-consumers; our ability to maintain and enhance our brand and reputation; changes demanded by our customers in the deployment and payment model for our products; continued growth in markets relating to network security; the success of any future acquisitions or investments in complementary companies, products, services or technologies; the ability of our sales team to execute well; our ability to shorten our close cycles; the ability of our channel partners to sell our products; variations in product mix or geographic locations of our sales; risks associated with our presence in international markets; weaknesses or deficiencies in our internal control over financial reporting; our ability to timely file periodic reports required to be filed under the Securities Exchange Act of 1934; and other risks that are described in “Risk Factors” in our periodic filings with the Securities and Exchange Commission, including our Form 10-K filed with the Securities and Exchange Commission on February 25, 2026. We do not intend to update or alter our forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law. This presentation and the accompanying oral presentation also include certain non-GAAP financial measures including non-GAAP net income, non-GAAP net income per basic and diluted share (or non-GAAP EPS), non-GAAP gross profit and gross margin, non-GAAP operating expenses, non-GAAP operating income and operating margin, Adjusted EBITDA and Adjusted EBITDA margin. Non-GAAP financial measures do not have any standardized meaning and are therefore unlikely to be comparable to similarly titles measures presented by other companies. A10 Networks considers these non-GAAP financial measures to be important because they provide useful measures of the operating performance of the company, exclusive of unusual events or factors that do not directly affect what we consider to be our core operating performance and are used by the company’s management for that purpose. Non-GAAP financial measures should not be considered in isolation from, or as a substitute for, financial information prepared in accordance with GAAP. We define non-GAAP net income as our GAAP net income excluding: (i) stock-based compensation and related payroll tax, (ii) acquisition-related expense, (iii) amortization of acquired intangible assets, (iv) amortization of debt issuance costs, (v) certain legal expense and (vi) income tax effect of non-GAAP items (i) to (v) listed above. We define non-GAAP net income per basic and diluted share as our non-GAAP net income divided by our basic and diluted weighted-average shares outstanding. We define non-GAAP gross profit as our GAAP gross profit excluding (i) stock-based compensation and related payroll tax and (ii) amortization of purchased intangible assets. We define non-GAAP gross margin as our non-GAAP gross profit divided by our GAAP revenue. We define non-GAAP operating expenses as our GAAP operating expenses excluding (i) stock-based compensation and related payroll tax, (ii) acquisition-related expense, (iii) amortization of acquired intangible assets and (iv) certain legal expense. We define non-GAAP operating income as our GAAP income from operations excluding (i) stock-based compensation and related payroll tax, (ii) acquisition-related expense, (iii) amortization of acquired intangible assets and (iv) certain legal expense. We define non-GAAP operating margin as our non-GAAP operating income divided by our GAAP revenue. We define Adjusted EBITDA as our GAAP net income excluding (i) interest and other income, net, (ii) depreciation and amortization expense, (iii) provision for income taxes, (iv) stock-based compensation and related payroll tax, (v) acquisition-related expense and (vi) certain legal expense. We define Adjusted EBITDA margin as our Adjusted EBITDA divided by our GAAP revenue. Non-GAAP financial measures are presented for supplemental informational purposes only for understanding the company's operating results.

Agenda Q1 2026 Overview 2026 Outlook

Q1’26: Profitable Growth, Durable Secular Catalysts Consistent Profitability Key TakeawaysRevenue Overview Q1 Revenue increased 13.4% year-over-year Security-led revenue continues to exceed long-term target TTM Enterprise growth of 13%, Service Provider growth of 11% Non-GAAP gross margins of 80.6% Adjusted EBITDA margins of 30% Non-GAAP EPS of $0.24 (diluted) Increasing relevance supporting AI infrastructure and applications Investments in next-generation networking and security yielding positive results Profitability in line with expectations See Appendix for reconciliation to most comparable GAAP financial measures.

Revenue and Adjusted EBITDA $66.1 $69.4 $74.7 $80.4 $75.0 Q1'25 Q2'25 Q3'25 Q4'25 Q1'26 Revenue, $ Millions $19.5 $19.7 $21.9 $24.9 $22.5 Q1'25 Q2'25 Q3'25 Q4'25 Q1'26 Adjusted EBITDA, $ Millions $66.1 $75.0 Q1 2025 Q1 2026 Revenue, $ Millions $19.5 $22.5 Q1 2025 Q1 2026 Adjusted EBITDA is a Non-GAAP Financial Measure. See Appendix for reconciliation to most comparable GAAP financial measures. Adjusted EBITDA, $ Millions

Revenue by Customer Vertical $39.0 $32.8 Q1 2025 Q1 2026 Service Provider Revenue, $ Millions $27.1 $27.8 $26.9 $34.1 $42.2 $39.0 $41.6 $47.8 $46.3 $32.8 Q1'25 Q2'25 Q3'25 Q4'25 Q1'26 Revenue, $ Millions Service Provider Enterprise $27.1 $42.2 Q1 2025 Q1 2026 Enterprise Revenue, $ Millions

Revenue by Geography 51% 59% 65% 64% 67% 28% 26% 22% 22% 19% 21% 15% 12% 14% 14% Q1'25 Q2'25 Q3'25 Q4'25 Q1'26 $ Millions Americas APJ EMEA 67% 19% 14% Q1’26 $75.0 million

Unified Product Architecture What We Do AI Infrastructure Enablement Massive scale traffic management Carrier-grade traffic processing High-performance NAT Application-aware traffic steering East-west load balancing Flexible performance optimization for distributed workloads Multi-layer DDoS mitigation (L3-L7) Web and API protection for modern applications Intelligent & automated threat protection N o w Network Security Next-Generation Networking Legacy Networking AI prompt and traffic routing AI inference securityAI-powered predictive analytics N ex t Common Policy Engine Shared OS & Security Platform Unified Control Plane

Consistent Value Creation Business Model Revenue Growth Capital Allocation

Thank You

A10Networks.com

Appendix

Financial Performance Trends Numbers may not sum due to rounding. Please refer to the supplemental financials posted in the “Investor Relations” section of the A10 Networks website at investors.A10networks.com Gross Margin %, Operating Margin %, Adjusted EBITDA and EPS are Non-GAAP Financial Measures. See Appendix for reconciliation to most comparable GAAP financial measures. $ Millions (except Margins and EPS) Q1’23 Q2’23 Q3’23 Q4’23 FY 2023 Q1’24 Q2’24 Q3’24 Q4’24 FY 2024 Q1’25 Q2’25 Q3'25 Q4’25 FY 2025 Q1’26 Revenue $57.7 $65.8 $57.8 $70.4 $251.7 $60.7 $60.1 $66.7 $74.2 $261.7 $66.1 $69.4 $74.7 $80.4 $290.6 $75.0 Non-GAAP Gross Margin % 83.1% 80.2% 81.8% 81.8% 81.7% 81.9% 80.9% 81.3% 80.7% 81.2% 80.9% 80.0% 80.7% 80.8% 80.6% 80.6% Non-GAAP Operating Margin % 23.1% 23.1% 20.6% 30.4% 24.6% 18.5% 21.1% 22.6% 32.7% 24.2% 24.4% 23.6% 24.7% 26.6% 24.9% 25.2% Adjusted EBITDA (non-GAAP) $15.5 $17.4 $14.4 $23.9 $71.2 $13.9 $15.5 $17.8 $27.3 $74.5 $19.5 $19.7 $21.9 $24.9 $86.0 $22.5 Non-GAAP EPS $0.13 $0.19 $0.16 $0.25 $0.73 $0.17 $0.18 $0.21 $0.31 $0.86 $0.20 $0.21 $0.23 $0.26 $0.90 $0.24 Ending Cash & Marketable Securities $144.5 $153.9 $169.0 $159.3 $159.3 $182.1 $177.1 $182.1 $195.6 $195.6 $355.8 $367.4 $370.9 $377.9 $377.9 $369.8

GAAP to Non-GAAP – Gross Margin and EPS Numbers may not sum due to rounding. EPS data is presented on a basic and diluted basis. Please refer to the supplemental financials posted the “Investor Relations” section of the A10 Networks website at investors.A10networks.com.

GAAP to Non-GAAP – Operating Income Numbers may not sum due to rounding. Please refer to the supplemental financials posted the “Investor Relations” section of the A10 Networks website at investors.A10networks.com. Q3’23

GAAP to Non-GAAP – Adjusted EBITDA Numbers may not sum due to rounding. Please refer to the supplemental financials posted the “Investor Relations” section of the A10 Networks website at investors.A10networks.com.

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