FOR IMMEDIATE RELEASE

KIRBY CORPORATION ANNOUNCES 2025 THIRD QUARTER RESULTS

HOUSTON, October 29, 2025 – Kirby Corporation (“Kirby”) (NYSE: KEX) today announced net earnings attributable to Kirby for the third quarter ended September 30, 2025, of $92.5 million or $1.65 per share, compared with earnings of $90.0 million, or $1.55 per share for the 2024 third quarter. Consolidated revenues for the 2025 third quarter were $871.2 million compared with $831.1 million reported for the 2024 third quarter.

David Grzebinski, Kirby’s Chief Executive Officer, commented, “Kirby’s third quarter performance reflects our ability to adapt and deliver results, with continued strength in coastal marine and power generation, and focused execution in the face of softer inland market conditions.”

“In inland marine, market conditions experienced near-term softness during the third quarter, primarily due to seasonally favorable weather, improved navigational conditions, a lighter feedstock mix for our refinery and chemical customers, and fewer barges undergoing maintenance across the industry. At the same time, general petrochemical customer activity remained muted with ongoing softness in the chemical industry. These factors contributed to our barge utilization averaging in the mid-80% range. On the pricing front, we observed temporary weakness in the spot market. Spot market rates declined in the low-to-mid single digits both sequentially and year-over-year while term contract renewals were flat when compared to the prior year. In the fourth quarter, we are already seeing market conditions improve and expect this trend to continue. We also continue to see constraints in long-term barge construction keeping new supply in check.”

“In coastal marine, market fundamentals remained strong during the third quarter. Barge utilization levels were in the mid to high-90% range, supported by consistent customer demand and tight industry supply. Pricing continued to meaningfully improve, with term contract renewals up in the mid-teens range year-over-year. The combination of strong demand and limited vessel availability contributed to operating margins reaching around 20% for the quarter.”

“In distribution and services, our teams performed well and delivered year-over-year growth in both revenue and operating income, with solid contributions across most of our end markets. In power generation, revenues increased 56% year-over-year as demand from data centers and prime power customers continued to show strength. As inbound orders accelerated, our backlog grew, and we secured more opportunities in backup and behind-the-meter power applications. In the commercial and industrial market, revenues increased 4% year-over-year, supported by

consistent marine repair activity and continued improvement in on-highway service. In oil and gas, while revenues declined year-over-year due to softness in conventional activity, we achieved a 5% increase in operating income driven by strong execution, strategic cost management, and sustained execution in e-frac equipment. Overall, the segment continued to perform well, reflecting strength in power generation and our agility in responding to changing demand patterns, with total segment operating income advancing 40% year-over-year.”

Segment Results – Marine Transportation

Marine transportation revenues for the 2025 third quarter were $484.9 million compared with $486.1 million for the 2024 third quarter. Operating income for the 2025 third quarter was $88.6 million compared with $99.5 million for the 2024 third quarter. Segment operating margin for the 2025 third quarter was 18.3% compared with 20.5% for the 2024 third quarter.

In the inland market, 2025 third quarter average barge utilization was in the mid-80% range, down from 2024 third quarter. During the quarter, average spot market rates were down in the low-to-mid single digits sequentially and compared to the 2024 third quarter. Term contracts that renewed in the third quarter were flat on average compared to a year ago. The inland market represented approximately 80% of segment revenues in the third quarter of 2025. Inland’s operating margin was in the high teens range for the quarter.

In coastal, market conditions were strong during the quarter, with Kirby’s barge utilization in the mid to high-90% range. Term contracts that renewed in the third quarter increased in the mid-teens range on average compared to a year ago. Coastal revenues increased 13% year-over-year driven by increased pricing. Coastal represented approximately 20% of marine transportation segment revenues during the third quarter and had an operating margin around 20%.

Segment Results – Distribution and Services

Distribution and services revenues for the 2025 third quarter were $386.2 million compared with $345.1 million for the 2024 third quarter. Operating income for the 2025 third quarter was $42.7 million compared with $30.4 million for the 2024 third quarter. Operating margin was 11.0% for the 2025 third quarter compared with 8.8% for the 2024 third quarter.

In the power generation market, revenues increased 56% and operating income increased 96% compared to the 2024 third quarter driven by strong execution on backlog. Orders continued to grow as the need for behind-the-meter power and back up capabilities remains critical. Overall, power generation revenues represented approximately 45% of segment revenues. Power generation operating margins were in the low double digits.

In the commercial and industrial market, revenues increased 4% and operating income increased 12% compared to the 2024 third quarter, fueled by steady marine repair work and gradual gains in on-highway repair services. Overall, commercial and industrial revenues represented approximately 44% of segment revenues. Commercial and industrial operating margins were in the high single digits.

In the oil and gas market, revenues declined 38% while operating income increased 5% compared to the 2024 third quarter driven by lower levels of conventional oilfield activity which resulted in decreased demand for new transmissions and parts partially offset by deliveries of e-frac equipment. Overall, oil and gas revenues represented approximately 11% of segment revenues. Oil and gas operating margins were in the low double digits.

Cash Generation

For the 2025 third quarter, EBITDA was $201.4 million compared with $190.5 million for the 2024 third quarter. During the quarter, net cash provided by operating activities was $227.5 million, and capital expenditures were $67.2 million. During the quarter, the Company had net proceeds from asset sales totaling $16.8 million. Kirby also used $120.0 million to repurchase stock at an average price of $91.30. As of September 30, 2025, the Company had $47.0 million of cash and cash equivalents on the balance sheet and $380.2 million of liquidity available. Total debt was $1,048.9 million and the debt-to-capitalization ratio was 23.8%.

2025 Outlook

Commenting on the outlook for the fourth quarter of 2025, Mr. Grzebinski said, “As we enter the fourth quarter, we remain focused on execution and disciplined capital allocation, while navigating evolving market conditions across our businesses. Despite near-term challenges in the inland market, we remain confident the inland barge cycle still has years to go given supply constraints. Our structural advantages in marine and growing backlog in power generation provide meaningful upside potential. With our strong balance sheet and robust free cash flow, we are well positioned to pursue strategic investments whether through targeted capital projects, selective acquisitions, or returning capital to shareholders. This financial strength provides us with the flexibility to manage near-term uncertainty while remaining focused on creating long-term value.”

In inland marine, market conditions are expected to remain stable, with some early signs of improvement evident. Seasonal weather factors could work to further reduce barge availability across the industry, which should support higher barge utilization for the full quarter. While term contract rates are expected to continue improving over the long term, driven by the slow pace of newbuild activity and tight vessel availability, spot market pricing could continue to face modest pressure in the near term if demand softness re-emerges. However, thus far in the fourth quarter we have seen a meaningful improvement in demand. Overall, inland revenues and margins are expected to improve modestly from the third quarter levels, assuming tighter barge availability holds in the fourth quarter.

In coastal marine, market fundamentals remain very favorable, with steady customer demand and barge utilization expected to hold in the mid to high-90% range. Pricing continues to benefit from limited availability of large capacity vessels and limited newbuilds, helping to offset inflationary and regulatory headwinds. Kirby expects to conclude the year with coastal revenues and operating margins comparable to the third quarter of 2025.

In distribution and services, the outlook reflects strength in growing markets with continued discipline in challenged areas. Power generation continues to be a strong contributor, with sustained demand from data centers and industrial customers driving order growth. OEM lead times and delivery schedules, now a consistent feature of the operating environment, remain a factor in project timing. In commercial and industrial, marine repair activity is strong, and the on-highway market continues to improve. Oil and gas growth remains limited by current market dynamics and customer capital discipline; however, we continue to demonstrate solid performance in e-frac and maintain strong cost control. For the segment, we now expect full-year revenues to be up in the mid-single digits, with operating margins in the high-single digits.

Kirby expects to generate net cash provided from operating activities of $620 million to $720 million in 2025 and capital spending is expected to range between $260 million to $290 million. Approximately $180 million to $210 million is associated with marine maintenance capital and improvements to existing inland and coastal marine equipment, and facility improvements. Up to approximately $80 million is associated with growth capital spending in both our businesses.

Conference Call

A conference call is scheduled for 7:30 a.m. Central Daylight Time today, Wednesday, October 29, 2025, to discuss the 2025 third quarter performance as well as the outlook for 2025. 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 2024 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, 2024.

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 after-market services and genuine replacement parts for engines, transmissions, reduction gears, electric motors, drives, and controls, specialized electrical distribution and control systems, and related equipment used in oilfield services, marine, power generation, on-highway, 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, electric power generation equipment, and specialized electrical distribution and control equipment for oilfield service, railroad and other industrial customers.

CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS

CONDENSED CONSOLIDATED FINANCIAL INFORMATION

MARINE TRANSPORTATION STATEMENTS OF EARNINGS

DISTRIBUTION AND SERVICES STATEMENTS OF EARNINGS

OTHER COSTS AND EXPENSES

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):

MARINE TRANSPORTATION PERFORMANCE MEASUREMENTS