Loar is proving the roll-up can scale
- Loar sells small but important aerospace and defense parts that can be hard to replace once approved on an aircraft.
- Aftermarket sales were about 55% of 2025 revenue, giving Loar repeat demand from aircraft already in service.
- Q1 2026 sales rose 36.1%, with 11.4% organic growth and the rest from recent deals.
- The bull case got stronger after Loar reported a record 40.5% adjusted EBITDA margin and raised 2026 guidance.
- The main check on the story is debt, because LMB and Harper added scale but also raised interest and integration risk.
A stronger roll-up, still priced for skill
Loar buys and builds companies that make niche aircraft parts. The key idea is simple: once a part is approved on an aircraft, customers do not switch suppliers lightly. That gives Loar pricing power and repeat sales, especially in the aftermarket, which is replacement parts and repairs for aircraft already flying.
The Q1 2026 update made the bull case stronger. Net sales rose 36.1% to $156.1 million, and organic sales rose 11.4%. Management also said adjusted EBITDA margin reached a record 40.5%. That means profit before interest, taxes, depreciation, amortization, and certain adjustments grew faster than sales, even while commercial original-equipment sales led the mix.
The earlier worry was that acquisitions were hiding weaker profit quality. Management pushed back on that. It said lower GAAP net income was mainly tied to higher interest and non-cash acquisition charges, such as amortization and inventory step-up. It also said the defense sales dip was a timing issue, not lost demand, and pointed to record defense backlog.
This is not an all-clear story. The Finn view is balanced because the stock already expects a lot, and leverage matters. If Loar keeps margins near 40%, turns defense backlog into sales, and starts converting its $700 million new business pipeline, the thesis can keep improving. If debt costs stay high or integrations stumble, the premium case can fade quickly.
Tiny parts, sticky positions
Loar makes highly engineered components for aircraft and defense systems. Its parts include safety, control, braking, lighting, filtration, and cockpit items. Many are small in dollar size compared with the full aircraft, but they matter for safety or performance.
The company makes money in two main ways. First, it sells parts to aircraft makers and defense programs as original equipment. Second, it sells aftermarket parts after the aircraft is in service. In 2025, aftermarket was about 55% of revenue and OEM was about 45%. Aftermarket demand can be steadier because planes need parts for years.
Growth comes from two engines. Loar tries to win new programs on its own, and management said its five-year organic new business pipeline is now $700 million. It also buys companies, then pushes pricing, cost controls, and cross-selling. The recent LMB and Harper Engineering deals added sales, but they also made the balance sheet more important.
Where the model can break is clear. If Loar overpays for deals, fails to integrate factories, loses key customer approvals, or sees flight hours fall, profit can miss the high margin target. Debt adds pressure because more cash must go to interest before shareholders benefit.
Parts spread across the aircraft
Flight control and cockpit components
Auto throttles, cockpit panels, knobs, switches, and human-machine interface products help pilots control and monitor aircraft. These parts can be sticky once designed into a platform.
Safety restraints and fire barriers
Seat belts, lap-belt airbags, and fire barriers serve safety needs where certification matters. That can make switching suppliers slow and costly.
Braking and motion parts
Loar sells carbon and metallic brake discs, motion devices, rods, latches, bushings, and washers. These are narrow products, but many support long-lived aircraft fleets.
Sensors, switches, and ice protection
Temperature sensors, fluid sensors, switches, ice protection systems, and RAM air components fit the company’s high-IP niche strategy. New platform wins can turn into years of sales.
Water, air, and lighting systems
Water purification, illumination, filtration, and related cabin products broaden Loar beyond core mechanical parts. Beadlight added lighting, air filtration, and interface products in 2025.
Aftermarket replacement parts
Aftermarket is not one product line, but it is central to the model. It represented about 55% of 2025 revenue and can produce repeat demand as aircraft keep flying.
2025 sales mix by end market
Segment shares are from Loar’s 2025 Form 10-K for the year ended December 31, 2025. Loar also said 2025 sales were about 55% aftermarket and 45% OEM, so customer behavior after delivery matters as much as new aircraft builds.
What could break the thesis
Debt costs eat the margin gain
High impact · Medium oddsThe LMB and Harper Engineering acquisitions added scale, but also increased financial pressure. Q1 2026 net income fell partly because interest expense was higher. If rates stay high or cash flow misses, more of Loar’s profit goes to lenders instead of owners.
Defense backlog does not convert
Medium impact · Medium oddsManagement said the Q1 2026 defense decline came from unusual ordering patterns for F-18 brakes and RC-135 autothrottle products. It also pointed to record defense backlog and strong defense book-to-bill. The risk is that the timing issue lasts longer than expected or reflects a program slowdown.
Acquisitions look better on adjusted numbers than GAAP
Medium impact · Medium oddsLoar says recent GAAP pressure came from non-cash acquisition charges, including amortization and inventory step-up. Those charges may be normal after deals, but investors still need to see when they taper. If adjusted profit stays strong but GAAP profit and free cash flow lag, confidence can weaken.
New business pipeline converts too slowly
Medium impact · Medium oddsManagement said the organic new business pipeline reached $700 million. That sounds large, but a pipeline is not the same as revenue. If conversion stays near the low end of expectations, organic growth may not be enough to support the valuation without more deals.
Aerospace cycle turns down
High impact · Low oddsLoar depends heavily on commercial aerospace, business aviation, defense, and flight activity. A broad downturn in aircraft production, airline flying, or defense order timing would hit several parts of the business at once. That matters more when leverage is higher.
In one breath
What does Loar Holdings do?
Loar designs and makes niche parts for aircraft and defense systems. Its products include auto throttles, restraints, brakes, sensors, switches, water systems, lighting, and cockpit components.
Why do investors care about Loar’s aftermarket sales?
Aftermarket means replacement parts and service for aircraft already in use. Loar said aftermarket was about 55% of 2025 revenue, which can make demand more repeatable than one-time aircraft build sales.
Why did Loar’s Q1 2026 update help the bull case?
The company reported record sales, adjusted EBITDA, and adjusted EBITDA margin in Q1 2026. Management also raised 2026 guidance and said its organic new business pipeline had grown to $700 million.
What is the biggest risk for Loar stock?
The main risk is that debt and acquisition execution catch up with the company. If Loar cannot integrate LMB and Harper while keeping margins high and cash flow strong, the stock could lose support.