Best Aerospace, Maritime and Defense Companies in Connecticut, United States
The 71 best Aerospace, Maritime and Defense companies in Connecticut, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: ThayerMahan.
Our analysis of 50 Aerospace, Maritime and Defense companies
$6.7b in tracked funding; 89% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Aerospace, Maritime and Defense companies in Connecticut
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ThayerMahan Provider of autonomous maritime surveillance solutions 62Product top 25%Funding top 30%Growth top 30%Talent top 38% All 11 signals ▾Producttop 25% Fundingtop 30% Growthtop 30% Talenttop 38% AItop 45% Techtop 47% Innovationtop 50% Patentsbottom 46% Globalbottom 44% Marketbottom 43% Newsbottom 22% Product: 10 distinct product lines · Company stage: Series C Funding: Raised $83.0M across 4 rounds · 4 rounds over 9 yrs (0.4/yr) rank vs industry peers · Fliar Intelligence Index 62/100 | $83M | 30 mo ago | Series C | John Kao Co-founder and Executive Chairman | 2015 | WordPressApple iCloud MailMicrosoft 365+20 | 17 patents Autonomous maritime systems integrating sensor fusion, modular navigation, hybrid comms, and AI-driven perception. | 2 job openings · 1 expansion · 1 award |
| 2 | Raptor Scientific Provider of test and measurement instrumentation solutions, offering a range of products and services… | $60M | 81 mo ago | Acquired | Derek Coppinger Chief Executive Officer & Board Member | 2019 | WordPressApple iCloud MailMicrosoft 365+21 | — | — |
| 3 | LiquidPiston Reinventing rotary engines for efficient power solutions across diverse markets 67Moat top 19%Patents top 21%Funding top 27%Tech top 28% All 11 signals ▾Moattop 19% Patentstop 21% Fundingtop 27% Techtop 28% Innovationtop 29% Growthtop 30% Talenttop 38% Fin. healthtop 46% Globalbottom 47% Marketbottom 36% Newsbottom 22% Moat: Editorial + unicorn rating 8/10 · IP moat: 138 patents Patents: 138 patents matched (strict assignee match) · 45 filings since 2022 vs 34 in 2017-21 rank vs industry peers · Fliar Intelligence Index 67/100 | $50M | 3 mo ago | Series D | Nikolay Shkolnik Co-Founder | 2003 | WebflowSentryVimeo+27 | 136 patents Compact rotary two‑stroke hybrid engines and fuel vaporizers for UAV and mobile power | — |
| 4 | Hamiltonsundstrand Developer of aerospace and industrial systems and components for multiple sectors | $20K | 14 mo ago | Public | — | 1999 | — | — | — |
| 5 | Hexcel Advanced composites technology, producing carbon fiber reinforcements and resin systems for commercial… | — | 101 mo ago | Public | Thomas Gentile CEO & President & Chairman | 1946 | WordPress Block EditorWordPressMySQL+20 | 725 patents Patents concentrated in computing, sensing & instrumentation | 1 partnership · 1 award |
| 6 | MB Aerospace Manufacturer of aerospace engine components and repair business | — | 156 mo ago | Acquired | — | 2000 | — | 5,889 patents Aircraft cabin interior systems and thrust‑deflection hardware for commercial airplanes | — |
| 7 | aerocision AeroCision is a supplier of complex engine components and assemblies for the global aerospace industry. | — | — | Acquired | — | 1958 | — | — | — |
| 8 | Aerospace Drive Systems Provider of aerospace designing services | — | — | Acquired | Tom Holzthum CEO | 1946 | — | — | — |
Top 6 Aerospace, Maritime and Defense companies in Connecticut
#1
Series D · Bloomfield, Connecticut · founded 2003 · 17 employees$50Mraised▾
Reinventing rotary engines for efficient power solutions across diverse markets. The company develops compact, powerful, quiet, efficient, low-vibration, multi-fuel capable combustion engines scalable for various applications. They focus on military, aerospace, industrial, commercial, marine, UAV, urban mobility, and automotive sectors. Their patented thermodynamic cycle improves efficiency and reduces noise. They offer innovative engine technology, providing solutions for power generation and mobility. They aim to enhance mobility and reduce greenhouse gas emissions through optimized thermodynamics and rotary engine technology. They are an innovator of combustion engine and power system technologies for cleaner and more efficient mobility.
- Mar 2026Series D$500K
- Nov 2024Series C$25K
- Oct 2023Series C$30M
- Jun 2023Series C$50K
#2
Series C · Groton, Connecticut · founded 2015 · 90 employees$83Mraised▾
Provider of autonomous maritime surveillance solutions. It offers systems for undersea and anti-submarine warfare, maritime border and critical infrastructure security, and whale monitoring for vessel transit. Services also include offshore support, subsea infrastructure monitoring, and acoustic sciences. The company develops and deploys these solutions, providing tailored Search-as-a-Service offerings to meet diverse customer needs. Its approach emphasizes agile development and rapid deployment of AI-driven data platforms connected to autonomous systems.
- Nov 2023Series C$20M
- Feb 2023Series C$50.2M
- May 2020Series B$10M
- Apr 2017Series A$2.7M
#3
Acquired · Berlin, Connecticut · founded 2019 · 23 employees$60Mraised▾
Raptor Scientific is a leading provider of test and measurement solutions, offering a range of products and services for mission-critical applications. The company has acquired several businesses, including MEDTHERM Corporation, a leading provider of heat flux sensors, infrared radiometers, and thermocouples. Raptor Scientific's solutions are used in various industries, including aerospace, defense, and industrial markets. The company's focus on providing high-quality, accurate, and reliable products has established it as a trusted name in the industry.
- Sep 2019Series C$60M
#4
Public · Windsor Locks, Connecticut · founded 1999 · 2599 employees$20Kraised▾
Developer of aerospace and industrial systems and components for multiple sectors. It provides engineered solutions for aircraft, industrial, and energy applications. The company focuses on designing, manufacturing, and servicing a wide array of products. These products include control systems, power systems, and sensing technologies.
- Apr 2025Grant (prize money)$20K
#5
Public · Stamford, Connecticut · founded 1946 · 5590 employees—raised▾
Hexcel is a global leader in advanced composites technology, producing carbon fiber reinforcements and resin systems, and is the world leader in manufacturing composite materials for commercial aerospace, space and defense, and industrial markets. They offer a range of products including honeycomb, infusion resins, and carbon fiber.
#6
Acquired · East Granby, Connecticut · founded 2000 · 335 employees—raised▾
Manufacturer of aerospace engine components and repair business
- 2013Conventional Debt—
- Conventional Debt—
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Aerospace, Maritime and Defense coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Defense Technology is moving in the United States
A read on the academic research around Defense Technology — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 462 United States-affiliated papers.
- Pennsylvania State University19
- United States Air Force Research Laboratory15
- United States Naval Academy12
- U.S. Air Force Institute of Technology10
- Naval Postgraduate School9
- Photonics2→4
- Jamming6→7
- Electronic warfare55
- Radar36
- Missile32
- Missile defense18
- Jamming12
- Aerospace engineering2→4
- Cruise missile4→5
Where defense tech is researched across United States
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Who's filing defense tech patents in the United States
United States defense tech patent filing is accelerating — 57 filings from 65 assignees (2016–2025), led by Raytheon, BAE SYS INF & Elect SYS Integ, Lockheed; annual filings 3→6.
- Raytheon17
- BAE SYS INF & Elect SYS Integ15
- Lockheed10
- Leonardo Electronics US10
- AAI10
- Rocky Research7
- Huggett James M5
- Stroili Frank D5
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.