TDG vs VSEC: Which Is the Better Buy in 2026?
Last updated August 2026
Short answer
TDG and VSEC are similarly sized, but TDG trades noticeably cheaper on forward earnings (26.69x vs 34.21x): the market is paying up for VSEC's profile and pricing TDG more conservatively, or for faster growth. Which you prefer comes down to the drivers you believe, and whether adding either over-concentrates what you already own.
TDG vs VSEC: the tie-breaker metrics
Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.
| Metric | TDG | VSEC | What it tells you |
|---|---|---|---|
| Forward P/E | 26.69 | 34.21 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 39.21 | 67.03 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Beta | 0.88 | 1.21 | Volatility vs the market. Above 1 swings harder than the index; below 1 is steadier. Higher beta means bigger drawdowns to hold through. |
| Price vs 52-week range | 27% of range | 50% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
Reading it: TDG is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.
Before you buy: how TDG and VSEC affect your concentration
The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. TDG and VSEC share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.
This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined TDG and VSEC exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.
What does TransDigm Group (TDG) do?
TransDigm Group designs and manufactures highly engineered aerospace components used on commercial and military aircraft. Its business model is distinctive: it focuses on proprietary, sole-source parts (things like pumps, valves, actuators, ignition systems, cockpit controls, and specialized fasteners) where TransDigm is often the only approved supplier for a given aircraft. A large share of revenue comes from the aftermarket, selling replacement parts and spares over the decades-long service life of an aircraft, which carries very high margins and recurring demand. TransDigm grows through a disciplined acquisition strategy, buying niche aerospace-parts makers with similar proprietary, sole-source characteristics and then applying its playbook of value-based pricing and cost discipline. The company is known for a private-equity-style approach to capital allocation, high leverage, and large special dividends. Headquartered in Cleveland, Ohio, it serves commercial airlines, business jets, and defense customers worldwide.
What does VSE Corporation (VSEC) do?
VSE Corporation is a Miramar, Florida aftermarket company founded in 1959 that has reshaped itself into a focused aviation platform. It distributes engine and airframe accessory parts and provides maintenance, repair and overhaul (MRO) services for commercial and business and general aviation operators, having exited its legacy federal, defense and fleet businesses to become a pure-play aviation name. Aviation revenue surpassed $1 billion for the first time in 2025, and engine aftermarket activity now makes up over half of total revenue.
TDG vs VSEC: how do they differ?
Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.
- TDG drivers: High-margin proprietary aftermarket; Acquisition-driven growth.
- VSEC drivers: Aviation aftermarket tailwind; Precision Aviation Group scale-up.
Which fits which kind of investor
A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: TransDigm carries very high debt, a deliberate part of its model, which raises interest costs and financial risk if cash flow weakens or rates stay elevated. For VSEC, the most visible risk is valuation: VSEC trades at a triple-digit trailing price-to-earnings ratio and a forward multiple near the high-40s, leaving little room for disappointment.
TDG or VSEC: which should you pick?
TDG vs VSEC: the full fundamentals
TDG. TransDigm trades at a premium valuation justified by best-in-class margins, a wide sole-source moat, and a long record of compounding through acquisitions. The qualitative profile is a high-quality, highly levered aerospace compounder. The premium multiple and high leverage mean the stock is sensitive to air-traffic cycles, acquisition pace, and any erosion of pricing power.
VSEC. VSE has grown revenue quickly, and Q1 2026 revenue rose about 27 percent year over year before the Precision Aviation Group deal even closed, with full-year guidance calling for high-50s percent growth. Profitability has improved sharply off a low base, but the trailing earnings multiple near 100x and forward multiple near 49x show the market is already pricing in a lot of that expected growth.
Headline figures (approximate, early 2026): TDG shows revenue (ttm) ~$8 to 9 billion, ebitda margin ~50%, among the highest in aerospace, aftermarket revenue share roughly half of total revenue, net leverage high, by design (around 5x EBITDA); VSEC shows revenue (ttm) ~$1.18B, q1 2026 revenue ~$325M (up ~27% YoY), net income (ttm) ~$50M, market cap ~$6.1B.
The bottom line: TDG vs VSEC
TDG and VSEC are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined TDG and VSEC exposure against your real portfolio. It is not an investment adviser.
Wondering how TDG or VSEC fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in TransDigm Group with AI
Connect the broker you already use and ask Walnut's AI how TDG fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between TDG and VSEC?
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TransDigm Group designs and manufactures highly engineered aerospace components used on commercial and military aircraft. VSE Corporation is a Miramar, Florida aftermarket company founded in 1959 that has reshaped itself into a focused aviation platform. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is TDG or VSEC the better stock?
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Neither is universally better; they suit different views and risk levels. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, TDG or VSEC?
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On forward P/E (as of August 2026), TDG trades at 26.69x and VSEC at 34.21x, so TDG is the cheaper of the two on next year's expected earnings. A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both TDG and VSEC?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of TDG vs VSEC?
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TDG: TransDigm carries very high debt, a deliberate part of its model, which raises interest costs and financial risk if cash flow weakens or rates stay elevated. Commercial aftermarket revenue is sensitive to air-traffic cycles; a downturn in flying (as in a recession or pandemic) cuts demand sharply. The company's aggressive pricing on sole-source parts has drawn government scrutiny, including Department of Defense reviews of pricing to the military, creating regulatory and reputational risk. Growth depends on continued availability of attractive acquisitions at reasonable prices. The stock often trades at a premium valuation, leaving it exposed to multiple compression if growth or margins disappoint, and high leverage amplifies downside in stress scenarios. VSEC: The most visible risk is valuation: VSEC trades at a triple-digit trailing price-to-earnings ratio and a forward multiple near the high-40s, leaving little room for disappointment. The company has grown largely through large debt-and-equity-funded acquisitions, so integration missteps, higher interest costs, or slower-than-expected synergies from Precision Aviation Group could pressure results. Aviation aftermarket demand, while more recurring than new-aircraft production, still softens if air traffic or fleet utilization weakens. Original-equipment manufacturers capturing more aftermarket work through bundled engine programs, and consolidation among larger competitors, could squeeze independent distributors. Concentration in a single end market removes the buffer VSE's former defense and fleet segments once provided.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell TDG or VSEC; figures are approximate and dated (as of August 2026). Verify current data before investing.