What GMT Composites does

GMT Composites, Inc. is a privately held custom carbon fiber composite manufacturer founded in 1984 in Bristol, Rhode Island, originally as Goetz Marine Technology. The company designs and engineers carbon composite structures — including masts, booms, poles, bow sprits, rudders, boarding systems, and bespoke industrial parts — using pre-impregnated (pre-preg) uni-directional carbon fiber with epoxy resin sourced exclusively from Newport Composites. Parts are laid up by hand and cured in a 65-foot convection oven at 250°F, a process GMT markets as producing autoclave-equivalent quality at lower capital cost and risk. The firm has built over 1,000 carbon spars for vessels ranging from 30 to 140 feet and maintains a 99%+ survival rate on composite rudders, with products dating to 1990 still in service.

GMT operates a sales-led, quote-based custom manufacturing model with no off-the-shelf inventory. Customers submit estimate requests through the website and GMT provides project-specific proposals including weight comparisons and design specifications. The customer base is split across five primary segments: premium yacht builders and owners (Hinckley, Hylas, Nautor Swan, Royal Huisman, Feadship, Holland Jachtbouw, Westport, Delta Marine, Brooklin Boatyard); defense and aerospace (Northrop Grumman with 1,500+ assemblies delivered, Raytheon); scientific and undersea research (Harvard-Smithsonian Center for Astrophysics, Woods Hole Oceanographic Institution, Draper Laboratory); medical equipment (Radionics); and robotics/industrial automation (Brooks Automation). Marine remains the historical core, but industrial and defense work has grown into a material second vertical. The company is privately owned by President Jonathan Craig (since 2016), with 11-50 employees averaging 18 years of tenure, and operates from a single Bristol, RI facility. Distribution is global via direct sales with no dealer network, and GMT invests minimally in advertising, relying on word-of-mouth, its 40-year reputation, and its bi-annual Carbonics newsletter for demand generation.

Name

GMT Composites

Legal name

GMT Composites, Inc.

Website

https://gmtcomposites.com

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

11–50 employees

Short description

GMT Composites is a privately held custom carbon fiber composite manufacturer founded in 1984 in Bristol, RI, producing masts, spars, rudders, boarding systems, and bespoke industrial parts for premium yacht builders, defense contractors (Northrop Grumman, Raytheon), and research institutions.

Ownership category

akta.pro rank

Product category

Marine Composite Manufacturing

NAICS

Plastics and Rubber Products Manufacturing (326)

SIC

Miscellaneous Plastics Products (3080)

akta.pro primary industry

FRP/GRP & Composite Materials (Resins, Fibers, Core Materials) (IMAJAKAC)

akta.pro secondary industries

Outfitting Modules & Skids (Accommodation, Machinery, E-House, Pipe Racks) (IMAJAKAF), Sandwich Panels & Core Materials (Foam, Balsa, Honeycomb) (IMAJAKAD)

Keywords

• Carbon fiber composites
• Custom marine spars
• Boat building components
• Composite manufacturing
• Marine carbon rigging

Headquarters

HQ city

Bristol

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Carbon Marine Products: GMT designs and manufactures custom carbon fiber composite products for marine applications including masts, spars, booms, rudders, boarding systems, and custom marine parts. Revenue is generated through one-time custom manufacturing orders with production runs as short as prototyping and one-offs.
2. Custom Industrial/Defense Products: Custom carbon composite parts for defense, aerospace, robotics, scientific equipment, and industrial applications. Products include camera tubes, control panel assemblies, robotic end effectors, medical equipment components, and architectural elements.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

GMT Composites designs and manufactures custom carbon fiber composite components on a project basis for marine and industrial customers. Marine offerings include carbon masts, booms (including proprietary PowerFurl and Pocket Boom designs), poles, bow sprits, rudders and stocks, and boarding systems (sea stairs, gangways, ladders). Industrial offerings include carbon composite parts for robotics, scientific and undersea applications (submersibles, telescopes), defense (containers, camera tubes, control panels), and custom carbon applications. All parts are made in the USA from pre-preg uni-directional carbon with epoxy, engineered to customer specifications, and shipped worldwide.

Product overview

GMT Composites is a custom carbon fiber composite manufacturing company founded in 1984, offering a comprehensive portfolio of marine and industrial products. Their core marine products include Carbon Masts (conventional and in-mast furling systems), Carbon Booms (including PowerFurl furling booms and Pocket Booms), Carbon Poles, Carbon Bow Sprits, and Carbon Rudders & Stocks. They also manufacture complete Boarding Systems including Sea Stairs, Gangways/Passerelles, and Ladders. Beyond marine, they produce Custom Marine Products, Robotic & Industrial Parts, Science & Undersea Products, Defense Applications, and Custom Carbon Applications for furniture and architecture. All products are custom-manufactured in the USA using pre-impregnated carbon fiber with epoxy, and the company is known for their Faux Bois finish that mimics wood grain. The product line is distinguished by their proprietary manufacturing process using uni-directional pre-preg materials cured in their 65-foot oven rather than autoclave, and their extensive engineering capabilities for custom solutions ranging from small decorative pieces to 140-foot masts.

Differentiator

Problem solved

Functional benefit

Products and services

• Carbon Masts Custom carbon fiber masts for sailboats ranging from 30 to 140 feet in length, including conventional masts and in-mast furling systems, built to customer specifications using pre-preg uni-directional carbon/epoxy cured in GMT's 65-foot oven.
• Carbon Booms Custom carbon fiber booms for sailboats up to 120 feet, including conventional D-section booms and proprietary Pocket Boom and PowerFurl designs, engineered and manufactured to vessel specifications.
• PowerFurl Boom Proprietary carbon furling boom system with a mandrel-driven motor installed within the boom body, designed for boats from 40 to 120 feet with hydraulic or electric drive systems; allows push-button mainsail furling while preserving sail shape, using low profile sailtrack without a through-the-mast mandrel.
• Pocket Boom Pioneered Park Avenue style carbon boom with a hollow profile and wide open top that allows mainsails to flake automatically between lazy jacks when doused; designed for boats from 40 to 150 feet.
• Carbon Poles Custom carbon fiber spinnaker poles, whisker poles, and reaching struts weighing approximately half of comparable aluminum poles, for asymmetric and symmetric sail handling.
• Carbon Bow Sprits Custom carbon fiber bow sprits available in fixed, demountable, tube-launched, and deck-mounted configurations for asymmetric spinnaker boats.
• Carbon Rudders and Stocks Custom carbon composite rudders and rudder stocks for racing and cruising yachts of all sizes, built from pre-impregnated carbon with epoxy and uni-directional carbon skins over rigid foam cores, with designs to exceed American Bureau of Shipping standards.
• Boarding Systems Custom carbon boarding solutions encompassing Sea Stairs, Gangways/Passerelles, and Ladders designed and manufactured for sailboats, powerboats, and yachts of all sizes, from small craft to megayachts.
• Sea Stairs Articulating custom carbon boarding stairs that remain level for easy and safe boarding, deployable either perpendicular or parallel to the vessel.
• Gangways and Passerelles Custom carbon gangways and passerelles including telescoping, single plank, bi-fold, and sectional designs for private boats up to megayachts.
• Boarding and Swim Ladders Custom carbon fiber boarding and swim ladders with teak or carbon treads, designed for any application from small sailboats to large yachts.
• Custom Marine Products Bespoke carbon composite marine products including helm chairs, anchor rollers, radar arches, hardtops, cross beams, and custom structural parts for sailboats, powerboats, and yachts, engineered to customer specifications.
• Robotic and Industrial Parts Custom carbon composite parts for robotics, manufacturing automation, and industrial applications, including lightweight end effectors, industrial rollers, and large composite structures.
• Science and Undersea Products Custom carbon composite components for scientific and undersea applications, including telescope support structures, submersible parts such as ballast tanks and fairings, and medical imaging equipment components.
• Defense Applications Custom carbon composite products for defense and national security applications, including carbon containers, control panel assemblies, camera tubes, and prototypes for military platforms.
• Custom Carbon Applications Bespoke carbon fiber products for diverse non-marine applications including high-end furniture, architectural elements, light fixtures, and custom engineering projects.

Quantifiable outcome

• Over 1,000 spars built for vessels ranging from 30 to 120+ feet
• +4 more outcomes

Named customers20 records

Segments5 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

15 partnerships are on record, tiered core and minor.

• Northrop GrummancoreStrategic or Co-development PartnerGMT works with Northrop Grumman on defense applications including camera tubes for imaging gear and electronics for battlefield operations. GMT delivered over 1,500 completed assemblies to Northrop Grumman, including composite tubes with injection-molded and machined-metal parts installed.
• RaytheonminorStrategic or Co-development PartnerGMT works with Raytheon on defense applications, though specific project details are not disclosed.
• Harvard-Smithsonian Center for AstrophysicscoreStrategic or Co-development PartnerGMT was named 'the best outside contractor working on the project' during development of the submillimeter array. GMT built frames for 6-meter dishes (quadrupod structures standing 12 feet tall) for telescope installations on Hawaii's Mauna Kea volcano.
• Woods Hole Oceanographic Institution (WHOI)coreStrategic or Co-development PartnerGMT built three complex ballast tanks for the research submersible Alvin as part of a major refit to upgrade depth rating from 4,500 to 6,500 meters. The tanks had to fit around the vessel structure due to limited space.
• Draper LaboratorycoreStrategic or Co-development PartnerGMT built carbon composite parts for Navy applications including towed arrays and a fish body modeled after tuna for propulsion research. Draper developed the tail, actuator, and control system to mate with GMT's carbon fish body.
• Hinckley YachtscoreChannel Partner/ Reseller/ DistributorGMT has worked with Hinckley for decades, building carbon masts, furling systems, and rudders for Hinckley yachts. Notable projects include Bermuda 40, SW 51, SW 59, and various pilot boat models.
• Hylas YachtscoreChannel Partner/ Reseller/ DistributorGMT has built numerous carbon masts, PowerFurl booms, and furling systems for Hylas yachts including Hylas 70, Hylas 63, and Hylas 56 (Cruising World Boat of the Year).
• Morelli and Melvin Marine ArchitectscoreStrategic or Co-development PartnerGMT works closely with Morelli & Melvin on custom catamaran designs including the 80' Fat Cat. GMT designed and built cross beams and complementary components for rigs 12 feet taller than the original at the same weight.
• Lyman-MorsecoreChannel Partner/ Reseller/ DistributorGMT builds carbon rigs for boats built by Lyman-Morse including the Seguin 40 Mischief. Lyman-Morse organized the Camden Classic Cup where GMT customers were well represented.
• Holland JachtbouwminorChannel Partner/ Reseller/ DistributorGMT built a custom carbon arch for the 140' yacht Calliope designed by Langan Design Partners. The arch reduced weight by over 1,000 lbs, allowing the builder to avoid adding tons of ballast.
• Newport CompositescoreTechnology or IntegrationGMT sources pre-preg carbon fiber materials exclusively from Newport Composites. After evaluating materials from 7 manufacturers in 1990, GMT selected Newport's product for its superior resistance to impact damage and continued evaluation confirms it remains the best available.
• Polo Ralph LaurenminorStrategic or Co-development PartnerGMT collaborated with Polo Ralph Lauren to design and build custom carbon fiber furniture pieces as part of the brand's high-end product offerings.
• Tiffany & Co.minorStrategic or Co-development PartnerGMT built carbon composite parts used in Tiffany's jewelry production, demonstrating capability to work with luxury brands requiring precision components.
• Museum of Modern Art (MoMA)minorStrategic or Co-development PartnerGMT was hired by MoMA to build light fixtures, with some works exhibited at the museum in New York City.
• John Alden DesigncoreStrategic or Co-development PartnerGMT collaborated with John Alden Design and High Modulus (now Gurit) to develop the PowerFurl boom. John Alden Design continues to specify GMT products for their yacht designs.

Scale indicators6 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Hexcel Corporation: Hexcel is a major publicly traded manufacturer of advanced composite materials including carbon fiber, prepregs, and honeycomb core used across aerospace, defense, and industrial markets. While Hexcel operates at a much larger scale and primarily as a material supplier to GMT's segment rather than a direct fabricator of finished spars, it represents a broad incumbent in the carbon composites industry GMT serves.
• Toray Advanced Composites: Toray Advanced Composites (formerly TenCate Advanced Composites) is a leading global manufacturer of carbon fiber and prepreg materials serving aerospace, defense, automotive, and industrial markets. It overlaps with GMT as a supplier of prepreg materials and a broader incumbent in the carbon composites value chain serving similar end markets.
• Strongwell Corporation: Strongwell is a large US manufacturer of fiber-reinforced polymer (FRP) composites and custom composite structures for industrial, infrastructure, and architectural applications. While Strongwell's focus is primarily pultruded fiberglass structural products rather than carbon marine spars, it is comparable as an established US custom composites fabricator operating at scale in industrial markets.

Emerging players

• Rock West Composites: Rock West Composites is a US-based manufacturer and distributor of custom carbon fiber composite products, tubing, and fabricated parts serving aerospace, industrial, and recreational markets. It overlaps with GMT in custom carbon composite fabrication for industrial and aerospace customers, though it operates at a different scale and product mix than GMT's marine-dominated business.
• ACP Composites: ACP Composites is a US manufacturer and supplier of custom carbon fiber and composite products, laminates, and parts serving aerospace, robotics, medical, and industrial applications. It is comparable to GMT as a smaller-scale US custom carbon composite parts manufacturer targeting overlapping industrial end markets.

Direct peers

• Southern Spars: Southern Spars is a global leader in custom carbon fiber spars, rigging, and rig components for superyachts and grand prix racing yachts. It is a direct competitor to GMT in the high-end custom carbon spar market, serving overlapping customers including superyacht builders, racing syndicates, and naval architects, with comparable offerings in spars, booms, and rigging.
• Future Fibres: Future Fibres designs and manufactures carbon fiber rigging (stays, shrouds, rigging terminals) and integrated rig packages for superyachts. It competes with GMT at the integrated carbon rig level for megayachts, offering complementary rigging components that often pair with spar packages of the type GMT builds.
• Hall Spars: Hall Spars (formerly Hall Carbon) is a New Zealand-based custom carbon fiber spar and rigging manufacturer serving the offshore racing and superyacht markets. It directly competes with GMT on custom carbon spars for racing and cruising yachts, with similar product offerings including masts, booms, and rigging components for grand prix and high-end cruising applications.
• Offshore Spars: Offshore Spars manufactures custom carbon fiber spars, booms, and rigging components for racing and performance cruising yachts, with a particular focus on grand prix racing applications. It is a direct competitor to GMT in custom carbon spar engineering and fabrication for offshore racing campaigns.
• Axxon Composites: Axxon Composites is an Italian manufacturer of custom carbon fiber masts, booms, and components for racing and cruising sailboats. It competes with GMT in the European premium carbon spar segment, serving similar high-end yacht builders and racing customers with comparable custom-engineered carbon products.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/GMTComposites
• LinkedInlinkedin.com/company/gmt-composites
• Instagraminstagram.com/gmtcomposites
• Xx.com/GMTComposites

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 GMT Composites