Moog Inc. (NYSE: MOG.A): Satellite Propulsion & Space Motion Control Systems
Moog is a 75-year-old, East Aurora, New York-based motion-control company that builds satellite propulsion systems, actuation hardware, and slip rings for spacecraft, launch vehicles, and defense platforms. It started out making hydraulic valves for military aircraft in 1951 and has quietly turned its Space and Defense business into the largest of its four reportable segments.
Who they are
Moog was founded in July 1951 when Bill Moog, Art Moog, and Lou Geyer pooled $3,000 to start Moog Valve, built around Bill Moog's patented electrohydraulic servo valve — a technology that became foundational to precision motion control across aerospace and defense. More than seven decades later, the company still carries the Moog family name and trades under a dual-class structure (Class A shares as MOG.A, Class B as MOG.B), with Pat Roche now serving as Chairman and CEO. Moog has grown well beyond its original hydraulics business into a diversified aerospace and defense supplier, now organized into four segments: Space and Defense, Military Aircraft, Commercial Aircraft, and Industrial.
What they do
Moog's Space and Defense segment builds the motion-control hardware that lets spacecraft actually maneuver and function once they're in orbit: propulsion systems (mono- and bipropellant valves, feed systems, and electric propulsion subsystems for satellite stationkeeping), satellite buses, and slip rings — the rotating electrical connectors that let a satellite's solar arrays continuously track the sun while data and power still flow through. This same segment also supplies components for launch vehicles, missiles, armored ground vehicles, and naval systems, making Moog one of the more diversified suppliers in this stage of the value chain.
Moog's history in space propulsion runs deep — it acquired a dedicated In-Space Propulsion business back in 2012 — and its hardware has flown on a wide range of commercial and government satellite programs over the decades.
How they make money
Moog sells components directly to satellite manufacturers, launch vehicle builders, and defense primes through direct OEM sales on long-term programs, plus a meaningful aftermarket and spares business that tends to carry higher margins than initial hardware sales. Space and Defense has become the company's largest segment by revenue, a shift from Moog's historical identity as primarily an aircraft flight-controls supplier — reflecting both organic growth in space demand and the relative maturity of its commercial and military aircraft businesses.
Where it sits in the value chain
Moog sits in Stage 3: Components, Structures & Propulsion — supplying the propulsion and motion-control systems that satellite builders (Stage 2) need to actually operate a spacecraft once it reaches orbit, rather than just build its structure. Because Moog's propulsion and slip-ring hardware is largely program-agnostic, it shows up across a wide range of satellite platforms rather than being tied to any single customer's success — a structurally different risk profile than pure-play space startups.
The bigger trend
Moog's shift is part of a wider pattern among decades-old aerospace and defense suppliers: as commercial satellite constellations and government space budgets both scale up, legacy motion-control and hydraulics businesses that used to sell almost exclusively into commercial and military aircraft are finding their space and defense segments growing fastest. That's a structurally different growth driver than the aviation cycle Moog was built around — commercial aircraft demand tracks air travel, while satellite constellation buildouts track a much younger, still-scaling market. The read-through is that "space exposure" increasingly includes established industrial suppliers like Moog, not just the newer pure-play space companies getting most of the headlines.
What to watch
A few threads worth following for Moog's space business:
- Space and Defense segment mix shift — as this segment continues growing as a share of total revenue, Moog increasingly trades on space and defense fundamentals rather than commercial aviation cycles.
- Satellite constellation buildouts — large low-Earth-orbit constellation programs (commercial and government) are a structural demand driver for propulsion and slip-ring components at scale.
- Dual-class share structure — MOG.A (the more widely traded class) and MOG.B differ in voting rights; investors researching Moog should confirm which class a given quote or index membership refers to.
Related companies
Moog shares its value chain stage with other component, structure, and propulsion suppliers feeding the same launch vehicle and satellite programs.
FAQ
What is Moog's biggest business segment?
Space and Defense is now Moog's largest reportable segment by revenue, ahead of Military Aircraft, Commercial Aircraft, and Industrial — a shift from the company's historical identity as primarily an aircraft flight-controls supplier.
What's the difference between MOG.A and MOG.B stock?
Moog has a dual-class share structure. MOG.A (Class A) is the more widely traded class and is the one included in the S&P 400 index; MOG.B (Class B) generally carries different voting rights. Both represent the same underlying company.
What are slip rings used for on satellites?
A slip ring is a rotating electrical connector that lets power and data keep flowing between a satellite's body and its solar arrays even as the arrays rotate to continuously track the sun. Moog is a major supplier of this component.
When did Moog get into space propulsion?
Moog's propulsion business has deep roots in the space industry, reinforced by its 2012 acquisition of a dedicated In-Space Propulsion business, building on decades of prior work supplying motion-control hardware to satellite and launch vehicle programs.
Sources referenced
Moog Inc. investor relations and company site (moog.com) · Wikipedia company infobox data, cross-checked against filings · Forbes and PitchBook company profiles · MarketScreener company profile.
Last updated: August 2026