TransDigm Stock Is 15% Off Its High. A Covered-Call Trade Can Pay 9.8% a Year—With a Catch

TransDigm’s latest results offered another reminder of why the aerospace supplier has earned a premium valuation: commercial transport aftermarket sales grew 18%, and management lifted its full-year sales guidance by $150 million at the midpoint. The stock, however, is still about 15% below its 52-week high. For investors who own the shares, that gap creates the same question—how to make the wait productive. Selling a covered call is one answer.

The mechanics are straightforward. An investor holding 100 TransDigm shares can sell the call option struck at $1,360 and expiring on Dec. 17, 2027, collecting $16,300 in premium upfront. At today’s price, that is roughly 13% of the share value over 486 days—an annualized yield of about 9.8%. The strike is also about 10% above the current share price, so the call caps gains beyond that level but leaves room for a modest rally.

If TDG stays below $1,360 through expiration, the option expires worthless. The premium and the shares both remain in your account, and you can write another call if you want. If TDG closes above $1,360, the shares are called away at the strike price. The premium is still yours, and the combined gain—premium plus appreciation from the current price to $1,360—works out to about 23% over the holding period, or roughly 17% annualized. The cost is that any further upside belongs to the option buyer.

The same trade can also go wrong. If the stock falls, the $16,300 premium only cushions the first 13% of the decline over the holding period. Below that, you are absorbing losses on the shares, just as you would without the option. The income is real, but it is not a hedge against a fundamental problem.

What upside would you be giving up? The bull case is straightforward. TransDigm is a key supplier in aerospace and defense, and aftermarket parts are high-margin, repeatable revenue that tends to be less cyclical than new-aircraft production. If the operational momentum continues, the shares could trade well beyond $1,360, and a covered-call seller would miss that additional move.

Yet there is a real counterargument, and analysts have started pressing it. One noted that it may be “increasingly difficult to find aerospace acquisitions that are large enough to move the needle.” That is not an idle worry: TransDigm recently withdrew from its acquisition of Stellant after a government regulator said it “intended to challenge the transaction.” Since acquisitions are central to TransDigm’s value-creation strategy, more regulatory resistance could slow the stock’s recovery even if operations remain strong.

That makes the deal pipeline the key variable to watch. Management says it has firepower “in excess of $10 billion,” but the decision to sell a covered call ultimately comes down to whether you believe that capital can be put to work. If M&A stays a reliable engine, the option sale could mean leaving a lot of gains on the table. If the engine stalls, the annualized income from this trade starts to look like a reasonable reward for waiting.

For holders of TDG, this is a judgment call, not a mechanical trade. The strongest argument in favor of selling the call is that you are being paid for a view you already hold. The strongest argument against it is that you are capping the best-case outcome on a high-quality business with real momentum. Both are valid; the right answer depends on your conviction about the stock and your need for current income.

If you do not own TDG, the same idea can be applied to stocks you do own. A covered-call tool like the Covered Call Finder lets you enter a ticker, see what a call sale would pay today, and adjust the strike with a slider to trade off income versus upside. It is built to show what your existing portfolio could be generating in cash.

That cash can be useful, but it does not replace diversification. Selling calls on a single stock keeps you in a concentrated position; even a broad sector bet only trades single-name risk for single-theme risk. The Trefis High Quality (HQ) Portfolio, by contrast, holds roughly 30 quality, cash-generative companies across sectors, selected on fundamentals and then sized and rebalanced with discipline. Its long-term track record has beaten a blended benchmark of the S&P 500, S&P Mid-cap, and Russell 2000. The income from covered-call trades can improve your return, but it should not come at the expense of a well-diversified allocation.