Stewart & Stevenson

What Stewart & Stevenson does

Stewart & Stevenson, founded in 1902 in Houston, Texas, is an industrial power equipment manufacturer, distributor, and service provider operating across the energy, marine, on-highway, power generation, and construction sectors. The company serves as an authorized distributor and factory-certified service partner for major OEMs including Allison Transmission, MTU (Rolls-Royce Power Systems), Volvo Penta, Detroit Diesel, Deutz, Terex, Atlas Copco, and DEVELON, integrating their engines, transmissions, and equipment into custom-engineered solutions. Proprietary product lines include the ReVolt fifth-generation integrated electric fracturing system (6,600 HP dual-pump on a single trailer, claimed 99% emissions reduction vs. diesel), Rail King railcar movers (patented 3-point floating suspension, manufactured in Houston since 1990), FracTran transmissions purpose-built for fracturing, AccuFrac fleet control software, and custom medium-voltage switchgear/VFD systems (10W to 7+ MW, ATEX/IECEx compliant).

The company operates 33+ branch locations across 11 states, 274 service bays, a power rental fleet (20 kW to 2 MW generators plus compressors and pumps), and an ISO 9001:2008-certified Houston manufacturing facility. Revenue is generated through equipment sales, parts distribution (including DieselDash e-commerce portal), 24/7 service and warranty repair, usage-based rental, and custom manufacturing. Customers span oil & gas operators across the Permian, Eagle Ford, Bakken, DJ Basin and Haynesville; U.S. military (Coast Guard, Navy, Army); commercial marine (ferries, tugboats, barges); data centers; hospitals; and big-box retail. Since 2017 the company has operated as a wholly-owned subsidiary of Kirby Corporation (NYSE: KEX) within the Distribution and Services segment, following its earlier NYSE listing under ticker 'SVC' (2002) and the 2006 restructuring that formed Stewart & Stevenson LLC.

Name

Stewart & Stevenson

Legal name

STEWART & STEVENSON, LLC

Website

https://stewartandstevenson.com

Company type

Private

Founded year

1902

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

Stewart & Stevenson is a Houston-based industrial power equipment manufacturer and authorized OEM distributor serving oil & gas, marine, power generation, on-highway, construction, and military customers across 33+ U.S. branches, now operating as a subsidiary of Kirby Corporation.

Ownership category

akta.pro rank

Product category

Industrial Power Equipment

NAICS

Engine, Turbine, and Power Transmission Equipment Manufacturing (33361), Motor and Generator Manufacturing (335312), Electrical Equipment Manufacturing (33531), Oil and Gas Field Machinery and Equipment Manufacturing (333132)

SIC

Motors & Generators (3621), Engines & Turbines (3510), Oil & Gas Field Machinery & Equipment (3533), Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Engine Generator & Microgrid Power Plant EPC (Diesel/Gas Recip) (EUAEAAAJ)

akta.pro secondary industries

Power Electronics & Grid-Tie Equipment Manufacturing (Converters, Transformers, Switchgear) (EUAMAHAH), Industrial Power & Energy Equipment Rental/Leasing (Generators, Light Towers, Compressors) (TLABAFAG), Energy & Renewables Specialty Contracting (Solar PV, Storage, EV Charging) (IMAFALAJ)

Keywords

• Industrial power equipment
• Power generation systems
• Oil and gas equipment
• Marine propulsion engines
• Construction equipment dealer

Headquarters

HQ city

Houston

HQ country

United States

HQ region

North America

Offices33 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Equipment Sales: Sale of new industrial power equipment including diesel and gas generators, engines, transmissions, construction equipment, cranes, and custom-manufactured equipment. Partner with leading OEM manufacturers (MTU, Volvo Penta, Allison, Deutz, Terex, Atlas Copco, DEVELON) to provide complete solutions for purchase.
2. Parts Distribution: Sale of genuine OEM parts and aftermarket components. Extensive inventory of parts for engines, transmissions, and oilfield equipment with same-day shipping. Online parts portal through DieselDash e-commerce platform.
3. Service & Repair: 24/7 emergency repair, preventive maintenance, warranty repairs, and mobile field service. Factory-certified technicians diagnose, repair and maintain equipment across multiple engine and power system platforms.
4. Equipment Rental: Short-term and long-term rental of generators (20 kW to 2 MW), air compressors, pumps, and industrial lift equipment. Includes delivery, installation, connection, start-up, on-site monitoring, maintenance, and fueling. Contingency and standby contracts available.
5. Custom Manufacturing: Custom design and fabrication of oilfield equipment, frac equipment, railcar movers, and specialized components. API-certified manufacturing including CNC machining, welding, and assembly. Zero-hour rebuilds and remanufacturing services for frac equipment and transmissions.

Pricing tiers

Go-to-market motion3 records

Distribution channels6 records

Marketing channels6 records

Core offering

Stewart & Stevenson manufactures, distributes, and services industrial power equipment for the oil & gas, power generation, marine, on-highway, construction, and microgrid sectors. The company operates as an authorized distributor and service provider for major OEM brands including Allison, MTU, Volvo Penta, Detroit Diesel, Deutz, Terex, Atlas Copco, and DEVELON, while also designing proprietary products such as the ReVolt electric fracturing system, Rail King railcar movers, FracTran transmissions, and AccuFrac fleet control software. Revenue is generated through new equipment sales, parts distribution, custom manufacturing, 24/7 service and repair, and short- and long-term equipment rental from 33+ branches across 11 states.

Product overview

Stewart & Stevenson is an industrial power equipment company offering a comprehensive portfolio of products and services across the energy, marine, and industrial sectors. The core offering centers on diesel and natural gas power generation systems, including stationary and mobile generators ranging from 30 kW to multi-megawatt capacity, alongside natural gas microgrid solutions. The company distributes and services major OEM engine and transmission brands (MTU, Volvo Penta, Allison, Detroit Diesel, Deutz) for applications including on-highway vehicles, oil and gas operations, power generation, marine propulsion, and construction equipment. Key proprietary products include the ReVolt electric fracturing system (6,600 HP e-frac technology) and Rail King railcar movers. The company operates as an authorized dealer for Terex cranes, Develon construction equipment, and Atlas Copco portable power equipment. Service capabilities span equipment sales, rental (power rental fleet of generators, compressors, pumps), manufacturing (custom equipment fabrication from Houston facility), parts distribution (Diesel Dash online platform), and 24/7 maintenance/repair across 15+ locations in 11 states.

Differentiator

Problem solved

Functional benefit

Brands

• ReVolt: 5th generation integrated electric fracturing (eFrac) system delivering 6,600 HP on a single trailer with up to 99% emissions reduction
• Rail King
• Revolt Frac
• E-Daptive

Products and services

• ReVolt Electric Fracturing System Fifth-generation integrated electric fracturing (eFrac) equipment delivering 6,600 HP dual-pump performance on a single trailer. Reduces emissions by up to 99% compared to conventional diesel frac equipment, operates at approximately 85 dB, and integrates pumps, blenders, chemical systems, and AccuFrac controls on a single trailer without hydraulic systems. For oil & gas operators performing hydraulic fracturing.
• Rail King Railcar Movers Patented railcar mover product line featuring a 3-point floating suspension system and cushioned coupler system with up to 90,500 lbs tractive effort. Models include RK467 G7 (90,500 lbs, 320 bhp Volvo), RK347 G7, RK330 G6, RK327 G7, RK307 G7, RK297 G7, and RK290-WC G6. For rail yard, industrial, and marine terminal operators.
• Power Generation Systems Diesel and natural gas generators ranging from 400 kW to multi-megawatt systems, including turnkey standby systems, prime power solutions, and custom engineered generator sets. For facilities requiring reliable backup or continuous power including critical infrastructure, data centers, healthcare, and industrial operations.
• Natural Gas Microgrids Scalable natural gas microgrid systems from 100 kW to 100+ MW for 24/7 reliability, supporting AI data centers, hospitals, manufacturing, oil & gas, commercial campuses, and military facilities. Modular and scalable with 50% less CO2 and 90% less NOx than diesel generators.
• Oil & Gas Engines & Equipment Volvo Penta, MTU, and Deutz engines paired with Allison transmissions for hydraulic fracturing and drilling operations, along with custom oilfield equipment manufacturing and API-certified fabrication including FracTran transmissions (2,300-3,500 HP). For onshore and offshore oil and gas operators.
• Terex Rough Terrain Cranes Terex rough terrain cranes including TRT 40US (40 USt), TRT 70US (70 USt), TRT 80US (80 USt), and TRT 100US (100 USt) models with the TEOS Terex Operating System. For construction, industrial, and infrastructure projects.
• Franna Pick and Carry Cranes Franna AT24 US mobile pick and carry crane with maximum lifting capacity of 24 tons, featuring automatic counterweight detection and operator-settable maximum working height. For construction and industrial lifting applications.
• Develon Construction Equipment Develon heavy construction equipment including crawler excavators, wheel excavators, mini excavators, wheel loaders, track loaders, dozers, articulated dump trucks, and material handlers. Distributed across Texas, Louisiana, New Mexico, and Colorado with full OEM parts and lifecycle service support.
• Atlas Copco Portable Equipment Atlas Copco portable generators (25-625 kVA), air compressors (400-1800 CFM), and pump systems (19-9000 GPM) for construction, refineries, and industrial operations.
• Power Rental Short-term and long-term equipment rental of portable generators (20 kW to 2 MW), diesel and electric air compressors, pumps (16-9,000 GPM), refrigerated trailers, and industrial lift trucks. Includes delivery, installation, connection, start-up, on-site monitoring, maintenance, and fueling with 24/7/365 availability. Contingency and standby contracts available.
• Custom Manufacturing Services Custom equipment manufacturing including diesel and gas generator manufacturing, containerized power generation, frac equipment manufacturing, switchgear/VFD systems (VFD power output from 10W to 7+ MW, voltage range 220V-15kV), and zero-hour rebuilds/remanufacturing from the ISO 9001:2008 certified Houston facility.
• Marine Propulsion & Service MTU marine diesel engines (1,360 HP-13,000 HP) and Volvo Penta marine engines (13 HP-1,350 HP) with full service, engineering, and application support. Covers pleasure craft (25-500 ft) and commercial vessels including ferries, tugboats, push boats, and offshore barges across Maine to Texas.
• Genuine OEM Parts Extensive inventory of genuine OEM parts for engines, transmissions, and equipment with same-day shipping available through the DieselDash online ordering platform. Parts available by equipment type (e.g., Terex parts portal) for engines, transmissions, and oilfield equipment.
• On-Highway Service & Repair Factory-certified technician repair, maintenance, and emergency response for commercial vehicles including Allison Transmission service, Cummins and Detroit Diesel engine service, preventive maintenance programs, mobile field service, DOT inspections, and clutch/drivetrain repair for commercial trucking fleet operators.
• E-Daptive Energy Storage Solutions Clean, renewable, and replenishable energy storage solutions for commercial and industrial use.

Quantifiable outcome

• Reduce downtime by 25-30% through preventive maintenance programs
• +8 more outcomes

Named customers12 records

Segments7 records

Ideal customer profiles6 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

14 partnerships are on record, tiered core, minor and strategic.

• Allison TransmissioncoreOEM/ Whitelabel/ Licensing PartnerAuthorized distributor and service provider for Allison Transmission products including ReTrans inventory for on-highway applications and FracTran series (2300, 2600, 3300, 3500) for oilfield fracturing applications. Certified technicians provide diagnostics, rebuilds, and repairs for all series transmissions.
• MTU (Rolls-Royce Power Systems)coreOEM/ Whitelabel/ Licensing PartnerAuthorized distributor for MTU engines and power generation solutions including Series 1600 (1,006-2,000 HP) and Series 4000 (1,400-2,600 HP) for drilling and high-pressure operations. Florida and Atlantic regions are authorized distributors for MTU marine engines, parts, and service. Houston facility assembles and tests MTU powerpack solutions with Allison transmissions.
• Volvo PentacoreOEM/ Whitelabel/ Licensing PartnerAuthorized distributor for Volvo Penta engines (D11, D13, D16) paired with Allison transmissions for fracturing applications, and marine engines (13HP-13,000HP) for pleasure craft and commercial vessels. Full distribution, service, and application support for power generation and marine propulsion.
• Detroit DieselcoreOEM/ Whitelabel/ Licensing PartnerAuthorized service provider for Detroit Diesel engines including DD series. Factory-trained technicians provide diagnostics, rebuilds, and maintenance ensuring OEM-level performance and reliability. Also distributes Detroit Diesel products through subsidiary companies Florida Detroit Diesel-Allison and Atlantic Detroit Diesel-Allison.
• DeutzcoreOEM/ Whitelabel/ Licensing PartnerAuthorized distributor for Deutz industrial engines (TCD series) used in auxiliary equipment, powerpacks, and oilfield applications. Factory-trained technicians for service and parts support with EPA Tier 2/3/4 certified configurations.
• TerexcoreOEM/ Whitelabel/ Licensing PartnerAuthorized dealer for Terex Rough Terrain Cranes including TRT 40US (40 USt), TRT 70US (70 USt), TRT 80US (80 USt), and TRT 100US (100 USt) models. Also distributes Franna AT24 US pick and carry cranes. Provides sales, service, and parts support.
• Atlas CopcocoreOEM/ Whitelabel/ Licensing PartnerAuthorized dealer for Atlas Copco portable equipment including generators (25-625 kVA), air compressors (400-1800 CFM), and pump systems (19-9000 GPM). Stewart & Stevenson provides selection, service, and parts support for construction and industrial applications.
• DEVELONcoreOEM/ Whitelabel/ Licensing PartnerPremier dealer for DEVELON construction equipment including crawler excavators, wheel loaders, dozers, articulated dump trucks, and material handlers. Full equipment line access, OEM parts, and lifecycle service support through branch network across Texas, Louisiana, New Mexico, and Colorado.
• KawasakiminorOEM/ Whitelabel/ Licensing PartnerPartner for power generation solutions. Certified technicians trained for Kawasaki generator applications alongside other major brands.
• Daimler TruckminorOEM/ Whitelabel/ Licensing PartnerLogo appears on on-highway service page indicating partnership for truck engine and powertrain solutions. Factory-certified technicians service Daimler Truck products.
• CumminsminorOEM/ Whitelabel/ Licensing PartnerService and repair capabilities for Cummins engines including diagnostics, fuel and emission system service, and performance restoration. Rail King products use Cummins engines (QSB 6.7L Tier 4F).
• U.S. Coast GuardstrategicStrategic or Co-development PartnerTrusted resource for maintenance and repair of Coast Guard engines and marine equipment. This partnership credibility led to working relationship with Colombian Navy. Demonstrates military/government trust in Stewart & Stevenson's marine capabilities.
• U.S. NavystrategicStrategic or Co-development PartnerMarine engine and equipment maintenance and repair services for Navy operations, building on long history including World War II generator and truck production for military.
• U.S. ArmystrategicStrategic or Co-development Partner1991 contract to build $1.2 billion of 2.5-ton and 5-ton trucks (FMTV). Historical partnership including tow tractors, bomb ordinance loaders for Air Force, 6x6 trucks, Jeep refurbishment, and tank re-powering during World War II.

Scale indicators22 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Caterpillar: Global manufacturer of diesel and gas engines, generator sets, and power generation systems with direct overlap to Stewart & Stevenson's core generator and engine distribution business. Caterpillar competes through both direct sales and its own dealer network, and offers similar engine platforms (CAT, Perkins, MAK, FG Wilson) that overlap with S&S's MTU, Volvo Penta, and Deutz lines.
• Cummins: Manufacturer of diesel and natural gas engines, generator sets, and power generation solutions with significant overlap with S&S's engine distribution and service portfolio. Cummins' Power Generation segment directly competes in stationary and mobile power with the same end customers (data centers, hospitals, industrial facilities), and S&S already services Cummins engines.
• United Rentals: Largest equipment rental company in the world, offering power generation, compressors, pumps, and aerial/industrial lift rentals across North America. Direct competitor in the power rental and industrial equipment rental market, and an indirect competitor in the construction equipment distribution business (S&S distributes DEVELON).

Direct peers

• Generac Holdings: Leading manufacturer of backup and prime power generators, energy storage systems, and microgrid solutions for residential, commercial, and industrial customers. Direct overlap with S&S's power generation, natural gas microgrid, and energy storage (E-Daptive) product lines, particularly in the data center, healthcare, and commercial facility segments.
• Aggreko: Global provider of temporary power generation, temperature control, and energy storage rental solutions. Direct competitor in the industrial power rental market, particularly for emergency response, data center temporary power, and large event/construction site rentals, overlapping with S&S's Power Rental business (20 kW to 2 MW).
• Wärtsilä: Global marine and energy technology company manufacturing engines and propulsion systems for commercial vessels, offshore, and power generation. Direct overlap with S&S's marine propulsion business (MTU and Volvo Penta engines serving ferries, tugboats, and barges) and growing overlap in natural gas power generation and microgrids.

Others

• MTU (Rolls-Royce Power Systems): OEM partner and engine manufacturer whose products S&S distributes and services. MTU competes with S&S at the brand level for end customers (drilling, marine, power generation), but is also a critical supplier for the ReVolt and railcar mover product lines, creating both partnership and competitive tension.
• Volvo Penta: OEM partner providing engines for marine and oil & gas applications distributed by S&S. Volvo Penta maintains direct sales channels to OEMs and could potentially consolidate its distributor network, creating both partnership value and channel risk for S&S's marine and fracturing business.
• Allison Transmission: Manufacturer of commercial-duty automatic transmissions, including the ReTrans product line and FracTran series purpose-built for S&S. Allison is a critical OEM partner and supplier, but the FracTran co-development signals vertical integration that could shift the partnership boundary over time.
• Terex Corporation: Manufacturer of rough terrain cranes, port equipment, and aerial work platforms, including the Terex rough terrain crane and Franna pick-and-carry lines that S&S distributes. Terex maintains direct dealer and OEM relationships and could in theory consolidate its dealer network, creating channel risk for S&S's crane business.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

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Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Stewart & Stevenson