Stellant Systems
- Company typePrivate
- Founded2021
- HeadquartersTorrance, United States
- Headcount1,001–5,000
- GTM typeB2B
- OfferingHardware or Manufacturing
What Stellant Systems does
Stellant Systems designs and manufactures high-power RF and microwave power amplification components for mission-critical aerospace, defense, space, medical, and industrial applications. The company's portfolio spans 14 product lines including Traveling-Wave Tubes (TWTs), Traveling-Wave Tube Amplifiers (TWTAs), Solid-State Power Amplifiers (SSPAs), Microwave Power Modules (MPMs), Crossed-Field Amplifiers (CFAs), Klystrons, Magnetrons, Thyratrons, Inductive Output Tubes, Electronic Power Conditioners, and Xenon Ion Propulsion Systems (XIPS). Stellant holds differentiated positions as the sole manufacturer of space-qualified TWTs in the United States and the only vertically integrated space TWTA supplier globally, with more than 4,800 TWTs, 4,100 TWTAs, and 152 ion thrusters currently in orbit.
The company operates five U.S. manufacturing facilities in Torrance CA (headquarters, space products), Williamsport PA (defense tubes), Folsom CA (RF components, ex-Narda Microwave-West), and the PST sites in Melville NY and Topsfield MA (high-power GaN SSPAs, acquired from Comtech in November 2023 for ~$40M). Approximately 1,100 employees including nearly 100 veterans and over 150 engineers support these operations.
Stellant's revenue model is hardware sales to defense primes, U.S. and allied government agencies, satellite OEMs (including Airbus OneSat), medical LINAC manufacturers, and industrial customers, with approximately 50% of revenue derived from aftermarket and sustainment on legacy platforms. Go-to-market combines direct enterprise sales, regional sales representatives covering 35+ countries, and U.S. distribution. The company was established in October 2021 when Arlington Capital Partners acquired L3Harris Technologies' Electron Devices and Narda Microwave-West divisions; in December 2025, TransDigm Group announced its acquisition of Stellant for approximately $960 million, pending regulatory approvals.
Stellant Systems firmographics
Firmographics- Name
- Stellant Systems
- Legal name
- Stellant Systems, Inc.
- Website
- https://stellantsystems.com
- Company type
- Private
- Founded year
- 2021
- Operating status
- Acquired
- Headcount range
- 1,001–5,000 employees
- Ownership category
- akta.pro rank
Stellant Systems industry classification
Industry- Product category
- RF and Microwave Power Amplification
- NAICS
- Other Communications Equipment Manufacturing (33429), Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing (334511), Electrical Equipment Manufacturing (33531)
- SIC
- Electronic & Other Electrical Equipment (No Computer Equip) (3600), Electronic Coils, Transformers & Other Inductors (3677)
- akta.pro primary industry
- RF Front-End Modules (FEMs) & Integrated RF Modules (HDAHAMAA)
- akta.pro secondary industry
- Power Management & Protection Components (PMICs, regulators, power modules, fuses, TVS, surge/EMI protection) (IMAGAJAD)
Keywords
Where Stellant Systems is headquartered
LocationHeadquarters
- HQ city
- Torrance
- HQ country
- United States
- HQ region
- North America
Offices5 records
Markets served
Stellant Systems business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Technology or R&D, Supply Chain, Infrastructure, Marketing or Sales
Revenue model
- Aerospace & Defense Component Sales: Design and manufacture of high-power electronic components for aerospace and defense platforms, generating approximately 50% of revenue from the aftermarket. Products include TWTs, TWTAs, MPMs, SSPAs, CFAs, and other RF amplification devices for military aircraft, naval systems, and defense electronics.
- Space Component Sales: Supply of RF/microwave amplification products for satellite communications including space-qualified TWTs, TWTAs, nanoMPMs, and electronic power conditioners for commercial, civil, and military space missions.
- Defense Contract Manufacturing: Long-term defense contracts including the $91M IDIQ contract for AEGIS Combat System amplifier repair, $9.4M Navy contract for F/A-18 TWTs, and multiple contracts for CFA and TWT production supporting critical defense programs.
- Medical & Scientific Equipment: High-power devices for medical linear accelerators (LINAC) used in cancer radiotherapy treatment, industrial applications including food processing and agricultural production, and scientific research equipment.
- Industrial RF Components: RF and microwave power components for industrial applications including broadcasting, industrial heating, and scientific research equipment.
Go-to-market motion2 records
Distribution channels3 records
Marketing channels7 records
Stellant Systems product offering
Product offeringCore offering
Stellant Systems designs and manufactures high-power RF and microwave power amplification products for mission-critical applications. The company's portfolio spans 14 distinct product lines including Traveling-Wave Tubes (TWTs), Traveling-Wave Tube Amplifiers (TWTAs), Solid-State Power Amplifiers (SSPAs), Microwave Power Modules (MPMs), Crossed-Field Amplifiers (CFAs), Klystrons, Magnetrons, Thyratrons, Inductive Output Tubes (IOTs), Electron Emitters, Electronic Power Conditioners (EPCs), Xenon Ion Propulsion Systems (XIPS), control components, and amplifier modules/systems. Products are manufactured at five domestic facilities and serve defense, space, medical, scientific, and industrial markets.
Product overview
Stellant Systems is a premier manufacturer of RF and microwave power amplification products, offering a comprehensive portfolio of 14 distinct product lines. The company operates as the only vertically integrated space TWTA supplier in the world and the only manufacturer of space-qualified Traveling-Wave Tubes (TWTs) in the USA. The product portfolio centers on high-power amplification devices including Traveling-Wave Tubes, Traveling-Wave Tube Amplifiers (TWTAs), Solid-State Power Amplifiers (SSPAs), Microwave Power Modules (MPMs), and nanoMPM modules for space applications. Complementary products include Crossed-Field Amplifiers, Klystrons, Magnetrons, Thyratrons, Inductive Output Tubes, Electron Emitters, Electronic Power Conditioners, and XIPS propulsion systems. The company serves four primary markets: Space (satellite communications and propulsion), Defense (electronic warfare, radar, and directed energy), Medical & Scientific (linear accelerators for cancer treatment), and Industrial (food processing, agricultural production, and mining). All products are manufactured across five domestic facilities in Torrance CA, Williamsport PA, Folsom CA, Melville NY, and Topsfield MA.
Differentiator
Problem solved
Functional benefit
Brands
- Power Systems Technology (PST): High-power Solid-State Power Amplifiers (SSPAs) and control components manufacturing, acquired from Comtech in 2023
- nanoMPM®
- XIPS®
Products and services
- Traveling-Wave Tubes (TWTs)
Quantifiable outcome
- Over 4,100 TWTAs in orbit with 300 million operating hours
- +3 more outcomes
Companies that use Stellant Systems
Customer profileNamed customers5 records
Segments4 records
Ideal customer profiles4 records
Stellant Systems technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature6 records
Stellant Systems partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered minor and core.
- Jefferson Lab / DOE ARPA-EminorStellant Systems is a commercial partner in DOE ARPA-E NEWTON program grants totaling $8.17 million awarded to Jefferson Lab for developing accelerator-driven systems for nuclear waste transmutation. Stellant contributes magnetron technology development.
- TransDigm GroupcoreTransDigm Group announced acquisition of Stellant Systems for approximately $960 million in cash from Arlington Capital Partners. The deal was announced December 31, 2025 and remained pending subject to regulatory approvals. Stellant's proprietary products and aftermarket revenue model aligned with TransDigm's business strategy.
- Comtech Telecommunications Corp.coreStellant acquired Comtech's Power Systems Technology (PST) product line for $40 million (preliminary price of $35M plus up to $5M contingent consideration). The acquisition closed November 7, 2023, strengthening Stellant's SSPA portfolio.
- Airbus Defence and SpacecoreAirbus selected L3Harris Technologies (now Stellant Systems) to provide nanoMPM power amplification modules for OneSat satellites operating in multiple frequency bands for next-generation software-defined networks. Seven OneSat satellites in production for four major operators.
Scale indicators10 records
Recent moves6 records
Expansion highlights5 records
Stellant Systems competitors and assessment
Company assessmentDirect peers
- Communications & Power Industries (CPI): CPI is one of the closest direct competitors to Stellant, manufacturing traveling-wave tubes, klystrons, magnetrons, and other vacuum electron devices for defense, space, medical, and industrial markets. It competes head-to-head in space-qualified TWTs, satellite communications amplifiers, and radar/EW applications.
- Thales (Thales Electron Devices): Thales Electron Devices manufactures TWTs, klystrons, and microwave tubes for space, defense, and scientific applications, directly competing with Stellant in space-qualified TWTs and traveling-wave tube amplifiers globally.
- Qorvo: Qorvo is a leading supplier of GaN-based solid-state power amplifiers and RF components for defense, aerospace, and commercial applications. It directly competes with Stellant's SSPA portfolio and represents the primary solid-state substitute threat to vacuum-tube TWTs.
- Cobham Advanced Electronic Solutions: Cobham AES (now part of TransDigm, the pending acquirer of Stellant) manufactures RF/microwave components, integrated subsystems, and EW technology for aerospace and defense. It directly competes with Stellant across RF amplifiers and microwave subsystems and will become a sister company post-acquisition.
- Tesat-Spacecom: Tesat-Spacecom (an Airbus subsidiary) designs and manufactures satellite communication payloads and equipment including traveling-wave tube amplifiers. It both competes with Stellant in space TWTAs and is a downstream customer for space-grade RF components.
Broad incumbents
- Teledyne Technologies: Teledyne operates Teledyne Defense Electronics and Teledyne Microwave Solutions, which compete with Stellant across RF/microwave components, SSPAs, and electronic warfare subsystems. Its scale and broad portfolio make it an incumbent across many of Stellant's served markets.
- L3Harris Technologies: L3Harris was Stellant's former parent (Electron Devices and Narda Microwave-West divisions, divested in 2021). It continues to operate in adjacent defense electronics and competes with Stellant across RF components and integrated defense systems.
- Raytheon (RTX): Raytheon is a major U.S. defense prime contractor and a significant customer for Stellant's RF components, while also operating internal RF/EW capabilities. Its scale across EW, radar, and missile programs overlaps with Stellant's addressable defense market.
Emerging players
- MACOM Technology Solutions: MACOM designs and manufactures RF, microwave, and millimeterwave semiconductor products including GaN power amplifiers for defense and aerospace. It overlaps with Stellant's SSPA business and competes in GaN-based high-power amplification.
Regional players
- Toshiba Electronic Devices & Storage: Toshiba manufactures space-qualified traveling-wave tubes and high-power RF devices primarily for Asian and Japanese satellite and defense markets. It is one of the few non-U.S. competitors in space TWTs and competes with Stellant for satellite prime contracts.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks5 records
Key highlights7 records
Customer concentration
Stellant Systems social profiles
Digital presenceStellant Systems financial estimates
Financial estimateRevenue estimate
Valuation estimate
Stellant Systems leadership team
Management profileNumber of profiles
Profiles13 records
Stellant Systems subsidiaries and ownership
Company hierarchySubsidiaries1 record
Stellant Systems funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Stellant Systems M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Stellant Systems
What does Stellant Systems do?
Stellant Systems designs and manufactures high-power RF and microwave power amplification products for mission-critical applications. The company's portfolio spans 14 distinct product lines including Traveling-Wave Tubes (TWTs), Traveling-Wave Tube Amplifiers (TWTAs), Solid-State Power Amplifiers (SSPAs), Microwave Power Modules (MPMs), Crossed-Field Amplifiers (CFAs), Klystrons, Magnetrons, Thyratrons, Inductive Output Tubes (IOTs), Electron Emitters, Electronic Power Conditioners (EPCs), Xenon Ion Propulsion Systems (XIPS), control components, and amplifier modules/systems. Products are manufactured at five domestic facilities and serve defense, space, medical, scientific, and industrial markets.
Is Stellant Systems a public or private company?
Stellant Systems is a private company. It is classified as private equity controlled and is currently acquired.
When was Stellant Systems founded?
Stellant Systems was founded in 2021. It employs 1,001 to 5,000 people.
Where is Stellant Systems based?
Stellant Systems is headquartered in Torrance, United States, in the North America region.
How does Stellant Systems make money?
Five revenue lines are on record. Aerospace & Defense Component Sales are the primary driver. The others are space Component Sales, defense Contract Manufacturing, medical & Scientific Equipment and industrial RF Components.
Who are Stellant Systems's main competitors?
Direct peers on record are Communications & Power Industries (CPI), Thales (Thales Electron Devices), Qorvo, Cobham Advanced Electronic Solutions and Tesat-Spacecom. Broad incumbents are Teledyne Technologies, L3Harris Technologies and Raytheon (RTX). MACOM Technology Solutions is listed as an emerging player. Toshiba Electronic Devices & Storage is listed as a regional player.
Does Stellant Systems have an API?
No public API is recorded for Stellant Systems.
What industry is Stellant Systems in?
Stellant Systems's product category is RF and Microwave Power Amplification. Its primary akta.pro industry code is HDAHAMAA, RF Front-End Modules (FEMs) & Integrated RF Modules, with a secondary code of IMAGAJAD, Power Management & Protection Components (PMICs, regulators, power modules, fuses, TVS, surge/EMI protection). Its NAICS code is 33429 and its SIC code is 3600.