TransDigm Stock Slides 9.9% Over 7 Straight Down Days
A persistent stock slide at the aircraft component supplier is drawing attention, but the underlying data presents a more complicated picture.
A seven-day slide has erased about $7.7 billion from TransDigm (TDG)‘s market value. The stock has now moved lower for 7 consecutive trading days, a cumulative loss of 9.9%.
TransDigm Group Incorporated designs, produces, and supplies aircraft components. Its segments provide items like mechanical actuators, ignition systems, engineered latching devices, and elastomer sealing solutions.
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Here is how TDG stock stacks up against the S&P 500 over the streak and the periods around it:
| Return Period | TDG | S&P 500 |
|---|---|---|
| 1D | -1.6% | 0.4% |
| 7D (Current Streak) | -9.9% | 0.8% |
| 1M (21D) | -3.4% | 2.0% |
| 3M (63D) | -1.4% | 9.5% |
| YTD 2026 | -8.6% | 10.2% |
| 2025 | 12.2% | 16.4% |
| 2024 | 32.3% | 23.3% |
| 2023 | 66.6% | 24.2% |
The stock’s slide contrasts with its operating metrics.
This move appears specific to the company. Over the same 7 trading days, the S&P 500 returned +0.8%. The market is not unusually streaky right now, with 44 S&P 500 stocks on winning streaks of 3 days or more and 33 on losing streaks.
Fundamentally, TransDigm’s revenue over the last twelve months grew 13.3%, ahead of the S&P 500 median of 7.5%. Its operating margin of 46.8% is also well above the median of 18.4%. The market may be weighing these figures against a price-to-earnings multiple of 34.0, which is higher than the S&P 500 median of 24.2.
A streak is information, not an instruction.
A string of losses like this is a clear signal about momentum and investor attention. It is not, by itself, a reason to act. The disciplined approach is to treat the streak as a prompt to check the business against the price.
The data here offers a starting point for that assessment, showing a company with strong operating results that also trades at a premium valuation, even after its recent decline.
A slide like this always poses the same follow-up: which marked-down stocks are actually worth buying? Our Buy the Dip screen runs that test every day, flagging beaten-down names whose fundamentals still hold up.
And for anyone who would rather own the sector than one company’s story, an aerospace and defense ETF like ITA owns the whole group. That way, no single company’s next surprise decides the outcome.
A Losing Streak Reveals The Exposure You Already Had
A stock that falls day after day is a live lesson in what single-name exposure feels like. How much damage any single position could do to your net worth is a question with a precise answer. The Trefis Wealth team computes it for investors professionally, with the same rules-based systematic discipline that runs our High Quality Portfolio. Request a free vulnerability audit of your biggest positions.