KIRBY CORP

The Company, through its wholly owned subsidiary Kirby Distribution & Services, Inc. and its wholly owned subsidiaries Kirby Engine Systems LLC, (“Kirby Engine Systems”), Stewart & Stevenson LLC (“S&S”), United Holdings LLC (“United”), and Diesel Dash LLC and through Kirby Engine Systems’ wholly owned subsidiaries Marine Systems, Inc. (“Marine Systems”) and Engine Systems, Inc. (“Engine Systems”), serves three markets, commercial and industrial, power generation, and oil and gas. The Company sells genuine replacement parts, provides service mechanics to overhaul and repair engines, transmissions, reduction gears and related oilfield service equipment, rebuilds component parts or entire diesel engines, transmissions and reduction gears, electrical motors, drives, and controls, specialized electrical distribution and control systems, and related equipment used in oilfield services, marine, power generation, on-highway, and other commercial and industrial applications. Customers are served through a network of 61 branch locations across 16 states and Colombia, South America, as well as a proprietary on-line marketplace, www.dieseldash.com. The Company manufactures and remanufactures power generation equipment, railcar moving equipment, and oilfield service equipment, including pressure pumping units, for North American as well as for international oilfield service companies, and oil and gas operator and producer markets. The Company also sells engines, transmissions, power generation systems, and rents equipment including generators, industrial compressors, high capacity lift trucks, construction equipment and refrigeration trailers for use in a variety of commercial and industrial applications.

Effective January 1, 2024, the power generation revenue source within the distribution and services segment has been broken out from the commercial and industrial and oil and gas revenue sources due to the significance of the power generation market to the Company’s growth. This change had no net impact on overall Company or segment revenues and has been reflected retrospectively for all periods presented.

For the commercial and industrial market, the Company sells Original Equipment Manufacturers (“OEM”) replacement parts and new diesel engines, provides service mechanics and maintains facilities to overhaul and repair diesel engines and ancillary products for marine and on-highway transportation companies, and industrial companies. The Company rents equipment including generators, industrial compressors, high capacity lift trucks, construction equipment and refrigeration trailers for use in a variety of industrial markets.

For the power generation market, the Company provides engineered products and field services, OEM replacement parts and safety-related products to power generation operators and to the nuclear industry, manufactures engine generator and pump packages for power generation operators and municipalities, offers customized power generation systems for specific commercial and industrial applications, and rents equipment including generators.

For the oil and gas market, the Company sells OEM replacement parts, sells and services diesel engines, pumps and transmissions, manufactures and remanufactures pressure pumping units, manufactures cementing and pumping equipment, as well as coil tubing and well intervention equipment, electric power generation equipment, and specialized electrical distribution and control equipment. Customers include oilfield service companies, and oil and gas operators and producers.

No single customer of KDS accounted for 10% or more of the Company’s revenues in 2024, 2023, or 2022. KDS also provides service to KMT, which accounted for approximately 2% of KDS’s 2024 revenues, and 3% of the segment’s 2023 and 2022 revenues. Such revenues are eliminated in consolidation and not included in the table below.

The following table sets forth the revenues for KDS (dollars in thousands):