Form 8-K

8-K — KIRBY CORP

Accession: 0001193125-26-436155

Filed: 2026-10-28

Period: 2026-10-28

CIK: 0000056047

SIC: 4400 (WATER TRANSPORTATION)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — kex-20261028.htm (Primary)

EX-99.1 (kex-ex99_1.htm)

GRAPHIC (img121045063_0.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: kex-20261028.htm · Sequence: 1

8-K

0000056047false00000560472026-10-282026-10-28

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): October 28, 2026

KIRBY CORPORATION

(Exact name of registrant as specified in its charter)

Nevada

1-7615

74-1884980

(State or Other Jurisdiction of Incorporation)

(Commission File Number)

(IRS Employer Identification No.)

55 Waugh Drive, Suite 1000

Houston, Texas

77007

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s telephone number, including area code: 713-435-1000

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

KEX

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 October 28, 2026, Kirby Corporation (“Kirby” or the "Company") issued a press release announcing results for the third quarter ended September 30, 2026. A copy of the press release is attached as Exhibit 99.1 to this report.

EBITDA, a non-GAAP financial measure, is used in the press release. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. Kirby has historically evaluated its operating performance using numerous measures, one of which is EBITDA. EBITDA is presented because of its wide acceptance as a financial indicator. EBITDA is one of the performance measures used in calculating performance compensation pursuant to the Company’s annual incentive plan. EBITDA is also used by rating agencies in determining Kirby’s credit rating and by analysts publishing research reports on Kirby, as well as by investors and investment bankers generally in valuing companies. A quantitative reconciliation of EBITDA to net earnings attributable to Kirby for the 2026 and 2025 third quarters and first nine months is included in the press release. EBITDA is not a calculation based on generally accepted accounting principles and should not be considered as an alternative to, but should only be considered in conjunction with, Kirby’s GAAP financial information.

The press release also includes non-GAAP financial measures which exclude certain one-time items, including earnings before taxes on income (excluding one-time items), net earnings attributable to Kirby (excluding one-time items), and diluted earnings per share (excluding one-time items). A reconciliation of these measures with GAAP is included in the press release. Management believes that the exclusion of certain one-time items from these financial measures enables it and investors to assess and understand operating performance, especially when comparing those results with previous and subsequent periods or forecasting performance for future periods, primarily because management views the excluded items to be outside of Kirby’s normal operating results. The press release additionally includes free cash flow, a non-GAAP financial measure, which Kirby defines as net cash provided by operating activities less capital expenditures. A reconciliation of free cash flow with GAAP is included in the press release. Kirby uses free cash flow to assess and forecast cash flow and to provide additional disclosures on the Company’s liquidity. Free cash flow does not imply the amount of residual cash flow available for discretionary expenditures as it excludes mandatory debt service requirements and other non-discretionary expenditures. These non-GAAP financial measures are not calculations based on generally accepted accounting principles and should not be considered as an alternative to, but should only be considered in conjunction with Kirby’s GAAP financial information.

Item 9.01. Financial Statements and Exhibits

(d)

Exhibits

EXHIBIT INDEX

Exhibit Number

Description of Exhibit

99.1

Press release dated October 28, 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.

KIRBY CORPORATION

Date:

October 28, 2026

By:

/s/ Raj Kumar

Raj Kumar

Executive Vice President

and Chief Financial Officer

EX-99.1

Filename: kex-ex99_1.htm · Sequence: 2

EX-99.1

Exhibit 99.1

KIRBY CORPORATION

Contact: Donny Chia

713-435-1077

FOR IMMEDIATE RELEASE

KIRBY CORPORATION ANNOUNCES THIRD QUARTER 2026 RESULTS

•

Third quarter 2026 earnings per share of $2.09, up 27% year-over-year

•

Marine transportation revenues increased 17% year-over-year as market fundamentals continued to improve, driven by strong customer demand

•

Distribution and services revenues grew 6% year-over-year, driven by robust demand for behind-the-meter and backup power solutions

•

Returned $112 million of capital to shareholders through share repurchases during the third quarter of 2026

•

Entered into an agreement to acquire certain inland marine assets from undisclosed sellers for $115 million, including nine inland towboats, 14 inland tank barges, nine bow thrusters, and a fleeting operation serving the Corpus Christi area

•

Updated full-year earnings per share growth guidance range of 10% to 15% based on current outlook

HOUSTON, October 28, 2026 – Kirby Corporation (“Kirby” or “the Company”) (NYSE: KEX) today announced net earnings attributable to Kirby for the third quarter ended September 30, 2026, of $110.8 million, or $2.09 per share, compared with earnings of $92.5 million, or $1.65 per share, for the 2025 third quarter. Total revenues for the 2026 third quarter were $977.2 million compared with $871.2 million for the 2025 third quarter.

David Grzebinski, Kirby’s Chief Executive Officer, commented, “Our third quarter results reflected strong continued momentum across both businesses and solid execution throughout the organization. In marine transportation, strong barge utilization and favorable pricing trends supported performance during the quarter, though rising fuel costs continued to impact margins. In distribution and services, results benefited from robust demand in power generation and the strong growth of behind-the-meter solutions. Overall, the company executed well during the quarter and delivered solid financial and operating results, reflecting our continued focus on safety and operational excellence.”

“In inland marine, market fundamentals remained constructive during the quarter. Strong refinery operating rates, healthy petrochemical activity, and limited new industry capacity supported barge utilization in the low-90% range. Spot market rates improved sequentially in the low- to mid-single-digit range during the quarter, and term contract renewals increased in the low-single-digits compared with the prior year. Rising fuel costs remained a near-term headwind as higher costs were mitigated but not fully offset by cost escalators and rate recovery mechanisms in the quarter. Overall, the inland business delivered margins in the 20% range driven by a combination of steady demand, disciplined execution and limited industry capacity additions.”

“In coastal marine, customer demand remained stable with barge utilization in the high-90% range while third quarter coastal revenues increased slightly year-over-year. We had one contract renewal in the third quarter with an increase in the low-double-digit range. Operating margins were in the mid-teens range reflecting market specific dynamics and ongoing cost pressures.”

“In distribution and services, results reflected favorable market conditions for power generation and strong execution by our commercial and operational teams. Third quarter revenues increased 6% year-over-year, driven by strong demand for behind-the-meter and backup power generation solutions and a healthy environment for commercial and industrial.” Mr. Grzebinski concluded.

Segment Results – Marine Transportation

Marine transportation revenues for the 2026 third quarter were $568.7 million compared with $484.9 million for the 2025 third quarter. Operating income for the 2026 third quarter was $111.9 million compared with $88.6 million for the 2025 third quarter. Operating margin for the 2026 third quarter was 20% compared with 18% for the 2025 third quarter.

In inland marine, average barge utilization was in the low-90% range during the third quarter of 2026. Average spot market rates increased in the low- to mid-single-digit range sequentially during the quarter, reflecting improving market fundamentals. Term contract renewals increased in the low-single-digit range on average compared with the prior year. The inland market represented 81% of segment revenues in the third quarter of 2026. Inland operating margins were in the 20% range despite the impact of ongoing fuel cost headwinds.

In coastal marine, market activity remained strong, with barge utilization in the high-90% range. Coastal marine revenues increased slightly year-over-year and operating margins were in the mid-teens range, primarily reflecting fewer shipyard days compared to the second quarter of 2026. Coastal marine had a single term contract renewal in the third quarter with an increase in the low-double-digit range. Coastal marine represented 19% of segment revenues in the third quarter of 2026.

Segment Results – Distribution and Services

Distribution and services revenues for the 2026 third quarter were $408.5 million compared with $386.2 million for the 2025 third quarter. Operating income for the 2026 third quarter was $48.4 million compared with $42.7 million for the 2025 third quarter. Operating margin was 12% for the 2026 third quarter compared with 11% for the 2025 third quarter.

In the power generation market, revenues increased 8% and operating income increased 13% compared with the 2025 third quarter, reflecting continued demand for behind-the-meter and backup power solutions and solid execution even as OEM supply conditions remained dynamic. Order activity continued to strengthen, driven by demand from data center and industrial customers. Power generation represented approximately 46% of segment revenues for the quarter, with operating margins in the low-double-digit range.

In the commercial and industrial market, revenues increased 8% and operating income increased 23% compared with the 2025 third quarter, primarily reflecting strong marine repair activity and healthy demand across other industrial end markets. Commercial and industrial represented approximately 44% of segment revenues for the quarter, with operating margins in the low-double-digit range.

In the oil and gas market, revenues decreased 9% and operating income decreased 15% compared with the 2025 third quarter, however, revenues were flat and operating income was up 54% sequentially driven by higher-margin parts and service activity and ongoing cost management. Oil and gas revenues represented approximately 10% of segment revenues for the quarter, with operating margins in the low-double-digit range.

Acquisition of Inland Marine Assets

During the third quarter, Kirby entered into an agreement to acquire certain inland marine assets from undisclosed sellers for $115 million. The acquisition includes nine inland towboats, fourteen inland tank barges, nine bow thrusters, and a fleeting operation in Rockport, Texas, which is located on a 65-acre facility serving the Corpus Christi area. The acquired assets will enhance Kirby’s inland marine network in South Texas, expand fleeting and fueling capabilities near Corpus Christi, and support continued demand in the West End linehaul system. The transaction is expected to close in the fourth quarter of 2026 subject to customary closing conditions.

Financial Highlights

For the 2026 third quarter, EBITDA (non-GAAP) was $229.7 million compared with $201.4 million for the 2025 third quarter. During the quarter, net cash provided by operating activities was $143.5 million, and capital expenditures were $69.5 million, resulting in free cash flow (non-GAAP) of $74.0 million. Working capital remained elevated during the quarter, reflecting higher revenues in both segments, timing of collections, and higher fuel-related receivables in marine transportation.

In the 2026 third quarter, Kirby returned $112 million of capital through share repurchases at an average share price of $137.04. As of September 30, 2026, the Company had $38.3 million of cash and cash equivalents and $530 million of liquidity available. Total debt was $1,072 million and the debt-to-capitalization ratio was 23.7%.

2026 Outlook

Commenting on the outlook for the fourth quarter of 2026, Mr. Grzebinski stated, “As we enter the fourth quarter of 2026, we remain encouraged by the momentum across our businesses. Driven by strong operational execution and favorable market conditions, we believe Kirby is well positioned to capitalize on opportunities across our end markets and deliver solid performance in the remainder of the year. Despite ongoing macroeconomic and geopolitical uncertainty, customer demand remains healthy across many of our end markets. Based on current market conditions, we are narrowing our full-year earnings per share growth guidance to 10% to 15% and currently expect results toward the upper end of the range.”

In inland marine, market fundamentals are expected to remain constructive, supported by robust supply-demand dynamics and strong refinery and petrochemical operating rates. Barge utilization is expected to remain in the low-90% range, while both spot pricing and term contract renewal rates are expected to improve further during the remainder of the year. Inland operating conditions are expected to reflect normal seasonal weather impacts during the fourth quarter. Overall, inland revenues are expected to grow in the low-double-digit range, with operating margins expected to be in the high-teens to low-20% range for the full year.

In coastal marine, customer demand remains stable with barge utilization expected to remain in the high-90% range. Overall market conditions remain constructive, and pricing trends continue to improve, although elevated planned shipyard activity and higher fuel costs are expected to pressure margins during the fourth quarter. Overall, revenues are expected to increase in the mid-to-high-single-digit range for the full year, with operating margins expected to be in the mid-teens range.

In distribution and services, continued growth in power generation and strong marine repair activity are expected to support full-year results. In power generation, order momentum remains strong, supported by data center demand and the need for behind-the-meter and backup power solutions. While OEM engine delivery timing continues to create some variability in quarterly results, underlying customer demand remains robust. In commercial and industrial, customer activity is expected to remain healthy driven by strong demand in marine repair. In oil and gas, activity is expected to remain stable, subject to changes in the market environment. Overall, the Company expects segment revenues to grow in the high-single-digit range for the full year, with operating margins in the high-single-digit range.

The Company expects to generate net cash provided by operating activities of $575 million to $675 million in 2026 and capital spending is expected to range from $220 million to $260 million. Approximately $170 million to $210 million is expected to be allocated to marine maintenance capital and improvements to existing inland and coastal marine equipment, and facility improvements. Up to approximately $65 million is expected to be allocated to growth capital spending across both of our businesses.

Conference Call

A conference call is scheduled for 7:30 a.m. Central Daylight Time today, October 28, 2026, to discuss the 2026 third quarter performance as well as the outlook for 2026. To listen to the webcast, please visit the Investor Relations section of Kirby’s website at www.kirbycorp.com. For listeners who wish to participate in the question and answer session via telephone, please pre-register at Kirby Earnings Call Registration. All registrants will receive dial-in information and a PIN allowing them to access the live call. A slide presentation for this conference call will be posted on Kirby’s website approximately 15 minutes before the start of the webcast. A replay of the webcast will be available for a period of one year by visiting the News & Events page in the Investor Relations section of Kirby’s website.

GAAP to Non-GAAP Financial Measures

The financial and other information to be discussed in the conference call is available in this press release and in a Form 8-K filed with the Securities and Exchange Commission. This press release and the Form 8-K includes a non-GAAP financial measure, EBITDA, which Kirby defines as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. A reconciliation of EBITDA with GAAP net earnings attributable to Kirby is included in this press release. This press release also includes non-GAAP financial measures which exclude certain one-time items, including earnings before taxes on income (excluding one-time items), net earnings attributable to Kirby (excluding one-time items), and diluted earnings per share (excluding one-time items). A reconciliation of these measures with GAAP is included in this press release. Management believes the exclusion of certain one-time items from these financial measures enables it and investors to assess and understand operating performance, especially when comparing those results with previous and subsequent periods or forecasting performance for future periods, primarily because management views the excluded items to be outside of Kirby’s normal operating results. This press release additionally includes a non-GAAP financial measure, free cash flow, which Kirby defines as net cash provided by operating activities less capital expenditures. A reconciliation of free cash flow with GAAP is included in this press release. Kirby uses free cash flow to assess and forecast cash flow and to provide additional disclosures on the Company’s liquidity. Free cash flow does not imply the amount of residual cash flow available for discretionary expenditures as it excludes mandatory debt service requirements and other non-discretionary expenditures. This press release also includes marine transportation performance measures, consisting of ton miles, revenue per ton mile, towboats operated and delay days. Comparable marine transportation performance measures for the 2025 year and quarters are available in the Investor Relations section of Kirby’s website, www.kirbycorp.com, under Financials.

Forward-Looking Statements

Statements contained in this press release with respect to the future are forward-looking statements. These statements reflect management’s reasonable judgment with respect to future events. Forward-looking statements involve risks and uncertainties. Actual results could differ materially from those anticipated as a result of various factors, including adverse economic conditions, industry competition and other competitive factors, adverse weather conditions such as high water, low water, tropical storms, hurricanes, tsunamis, fog and ice, tornados, marine accidents, lock delays, fuel costs, interest rates, construction of new equipment by competitors, government and environmental laws and regulations, and the timing, magnitude and number of acquisitions made by the Company. Forward-looking statements are based on currently available information and Kirby assumes no obligation to update any such statements. A list of additional risk factors can be found in Kirby’s annual report on Form 10-K for the year ended December 31, 2025 and quarterly report on Form 10-Q for the quarter ended June 30, 2026.

About Kirby Corporation

Kirby Corporation, based in Houston, Texas, is the nation’s largest domestic tank barge operator, transporting bulk liquid products throughout the Mississippi River System, on the Gulf Intracoastal Waterway, and coastwise along all three United States coasts. Kirby transports petrochemicals, black oil, refined petroleum products, and agricultural chemicals by tank barge. In addition, Kirby participates in the transportation of dry-bulk commodities in United States coastwise trade. Through the distribution and services segment, Kirby provides equipment, after-market parts and services for power generation systems in applications that include behind the meter power systems and emergency backup systems, after-market and genuine replacement parts and services for engines, transmissions, reduction gears, electric motors, drives, and controls, specialized electrical distribution and controls systems, and related equipment used in power generation, marine, on-highway, oilfield services, and other industrial applications. Kirby also rents equipment including generators, industrial compressors, high-capacity lift trucks, construction equipment, and refrigeration trailers for use in a variety of industrial markets. Kirby also manufactures and remanufactures specialized equipment, including pressure pumping units and electric fracturing systems, electric power generation equipment, and specialized electrical distribution and control equipment for data centers, oilfield service, railroad, and other industrial customers.

CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS

Third Quarter

Nine Months

2026

2025

2026

2025

(unaudited, $ in thousands, except per share amounts)

Revenues:

Marine transportation

568,725

484,941

1,602,882

1,453,652

Distribution and services

408,482

386,220

1,140,823

1,058,623

Total revenues

977,207

871,161

2,743,705

2,512,275

Costs and expenses:

Costs of sales and operating expenses

651,342

580,491

1,841,470

1,656,065

Selling, general and administrative

92,499

87,812

282,468

268,945

Taxes, other than on income

10,062

9,768

29,995

29,140

Depreciation and amortization

71,580

66,873

210,179

196,273

(Gain) loss on disposition of assets

813

(3,002

)

(1,348

)

(4,759

)

Total costs and expenses

826,296

741,942

2,362,764

2,145,664

Operating income

150,911

129,219

380,941

366,611

Other income

7,261

5,557

21,569

15,703

Interest expense

(11,269

)

(11,838

)

(32,496

)

(35,105

)

Earnings before taxes on income

146,903

122,938

370,014

347,209

Provision for taxes on income

(35,994

)

(30,200

)

(87,981

)

(83,823

)

Net earnings

110,909

92,738

282,033

263,386

Net earnings attributable to noncontrolling interests

(94

)

(242

)

(292

)

(627

)

Net earnings attributable to Kirby

110,815

92,496

281,741

262,759

Net earnings per share attributable to Kirby common stockholders:

Basic

2.10

1.66

5.29

4.67

Diluted

2.09

1.65

5.26

4.64

Common stock outstanding (in thousands):

Basic

52,690

55,626

53,234

56,212

Diluted

53,019

55,970

53,568

56,560

CONDENSED CONSOLIDATED FINANCIAL INFORMATION

Third Quarter

Nine Months

2026

2025

2026

2025

(unaudited, $ in thousands)

EBITDA: (1)

Net earnings attributable to Kirby

110,815

92,496

281,741

262,759

Interest expense

11,269

11,838

32,496

35,105

Provision for taxes on income

35,994

30,200

87,981

83,823

Depreciation and amortization

71,580

66,873

210,179

196,273

229,658

201,407

612,397

577,960

Capital expenditures

69,531

67,280

189,295

217,440

Acquisitions of businesses and marine equipment

—

9,200

95,800

106,450

September 30,

2026

December 31,

2025

(unaudited, $ in thousands)

Cash and cash equivalents

38,290

78,775

Long-term debt, including current portion

1,071,751

919,281

Total equity

3,443,292

3,382,793

Debt to capitalization ratio

23.7

21.4

MARINE TRANSPORTATION STATEMENTS OF EARNINGS

Third Quarter

Nine Months

2026

2025

2026

2025

(unaudited, $ in thousands)

Marine transportation revenues

568,725

484,941

1,602,882

1,453,652

Costs and expenses:

Costs of sales and operating expenses

353,991

300,021

1,003,280

889,797

Selling, general and administrative

36,663

34,985

115,927

108,854

Taxes, other than on income

7,597

7,266

22,816

21,842

Depreciation and amortization

58,564

54,100

171,492

158,954

Total costs and expenses

456,815

396,372

1,313,515

1,179,447

Operating income

111,910

88,569

289,367

274,205

Operating margin

19.7

18.3

18.1

18.9

DISTRIBUTION AND SERVICES STATEMENTS OF EARNINGS

Third Quarter

Nine Months

2026

2025

2026

2025

(unaudited, $ in thousands)

Distribution and services revenues

408,482

386,220

1,140,823

1,058,623

Costs and expenses:

Costs of sales and operating expenses

296,861

280,049

836,859

766,608

Selling, general and administrative

50,014

50,081

154,516

152,154

Taxes, other than on income

2,438

2,472

7,105

7,216

Depreciation and amortization

10,745

10,949

32,422

31,950

Total costs and expenses

360,058

343,551

1,030,902

957,928

Operating income

48,424

42,669

109,921

100,695

Operating margin

11.9

11.0

9.6

9.5

OTHER COSTS AND EXPENSES

Third Quarter

Nine Months

2026

2025

2026

2025

(unaudited, $ in thousands)

General corporate expenses

8,610

5,021

19,695

13,048

(Gain) loss on disposition of assets

813

(3,002

)

(1,348

)

(4,759

)

RECONCILIATION OF FREE CASH FLOW

The following is a reconciliation of GAAP net cash provided by operating activities to non-GAAP free cash flow(2):

Third Quarter

Nine Months

2026

2025(3)

2026

2025(3)

(unaudited, $ in millions)

Net cash provided by operating activities

143.5

227.5

313.4

358.0

Less: Capital expenditures

(69.5

)

(67.2

)

(189.3

)

(217.4

)

Free cash flow(2)

74.0

160.3

124.1

140.6

MARINE TRANSPORTATION PERFORMANCE MEASUREMENTS

Third Quarter

Nine Months

2026

2025

2026

2025

Inland Performance Measurements:

Ton Miles (in millions) (4)

4,183

3,497

11,831

10,485

Revenue/Ton Mile (cents/tm) (5)

11.0

10.8

10.9

11.1

Towboats operated (average) (6)

294

270

290

283

Delay Days (7)

1,809

1,442

7,640

8,791

Average cost per gallon of fuel consumed

3.91

2.46

3.49

2.46

Barges (active):

Inland tank barges

1,148

1,105

Coastal tank barges

Offshore dry-cargo barges

Barrel capacities (in millions):

Inland tank barges

25.7

24.5

Coastal tank barges

2.9

(1)

Kirby has historically evaluated its operating performance using numerous measures, one of which is EBITDA, a non-GAAP financial measure. Kirby defines EBITDA as net earnings attributable to Kirby before interest expense, taxes on income, and depreciation and amortization. EBITDA is presented because of its wide acceptance as a financial indicator. EBITDA is one of the performance measures used in calculating performance compensation pursuant to Kirby’s annual incentive plan. EBITDA is also used by rating agencies in determining Kirby’s credit rating and by analysts publishing research reports on Kirby, as well as by investors and investment bankers generally in valuing companies. EBITDA is not a calculation based on generally accepted accounting principles and should not be considered as an alternative to, but should only be considered in conjunction with, Kirby’s GAAP financial information.

(2)

Kirby uses certain non-GAAP financial measures to review performance excluding certain one-time items including: earnings before taxes on income, excluding one-time items; net earnings attributable to Kirby, excluding one-time items; and diluted earnings per share, excluding one-time items. Management believes the exclusion of certain one-time items from these financial measures enables it and investors to assess and understand operating performance, especially when comparing those results with previous and subsequent periods or forecasting performance for future periods, primarily because management views the excluded items to be outside of the company's normal operating results. Kirby also uses free cash flow, which is defined as net cash provided by operating activities less capital expenditures, to assess and forecast cash flow and to provide additional disclosures on the Company’s liquidity. Free cash flow does not imply the amount of residual cash flow available for discretionary expenditures as it excludes mandatory debt service requirements and other non-discretionary expenditures. These non-GAAP financial measures are not calculations based on generally accepted accounting principles and should not be considered as an alternative to but should only be considered in conjunction with Kirby’s GAAP financial information.

(3)

See Kirby’s annual report on Form 10-K for the year ended December 31, 2025, and its quarterly report on Form 10-Q for the quarter ended September 30, 2025 for amounts provided by (used in) investing and financing activities.

(4)

Ton miles indicate fleet productivity by measuring the distance (in miles) a loaded tank barge is moved. Example: A typical 30,000 barrel tank barge loaded with 3,300 tons of liquid cargo is moved 100 miles, thus generating 330,000 ton miles.

(5)

Inland marine transportation revenues divided by ton miles. Example: Third quarter 2026 inland marine transportation revenues of $460.1 million divided by 4,183 million inland marine transportation ton miles = 11.0 cents.

(6)

Towboats operated are the average number of owned and chartered towboats operated during the period.

(7)

Delay days measures the lost time incurred by a tow (towboat and one or more tank barges) during transit. The measure includes transit delays caused by weather, lock congestion and other navigational factors.

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v3.26.3

Document and Entity Information

Oct. 28, 2026

Cover [Abstract]

Entity Registrant Name

KIRBY CORPORATION

Entity Central Index Key

0000056047

Document Type

8-K

Amendment Flag

false

Document Period End Date

Oct. 28, 2026

Securities Act File Number

1-7615

Entity Incorporation, State or Country Code

Entity Tax Identification Number

74-1884980

Entity Address, Address Line One

55 Waugh Drive

Entity Address, Address Line Two

Suite 1000

Entity Address, City or Town

Houston

Entity Address, State or Province

Entity Address, Postal Zip Code

77007

City Area Code

713

Local Phone Number

435-1000

Title of 12(b) Security

Common Stock

Trading Symbol

KEX

Security Exchange Name

NYSE

Entity Emerging Growth Company

false

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

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Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

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- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

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Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

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- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

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Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

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- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

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Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

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Namespace Prefix:

dei_

Data Type:

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Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

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Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

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Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

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Data Type:

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Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

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Name:

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