What if you'd held TDG?
A $1,000 investment in Transdigm Group Incorporated (TDG) at the month-end close of 2020-03 would be worth $3,554 at the close on 2026-10-16: a +255.4% price return. Through September 2026, the latest month the fund has reported, the same $1,000 became $3,379 in TDG and $3,252 in an S&P 500 index fund (TSP C Fund). The fund figure includes reinvested dividends; the stock figure does not, so the comparison favors the fund.
Your scenario
Result
If you'd bought $1,000 at the start of each year
Value of $1,000 invested on January 1 of each year and held to the latest close.
Every year, $1,000 from 2020
| Year | Value of $1,000 | Year return |
|---|---|---|
| 2020 | $1,000 | — |
| 2021 | $1,029 | +2.9% |
| 2022 | $1,017 | -1.2% |
| 2023 | $1,636 | +60.9% |
| 2024 | $2,042 | +24.8% |
| 2025 | $2,150 | +5.3% |
| 2026 | $1,840 | -14.4% |
Best and worst month to buy
The best month to have bought TDG was 2020-03, at a close of $320: $1,000 then is $3,554 today. The worst was 2025-07, at $1,608: $1,000 then is $708.
FAQ
What would $1,000 in TDG be worth today?
About $3,554 at the latest close, a price return of +255.4%. That is $1,000 put into TDG at the 2020-03 month-end close, the first in this price history.
What were the best and worst years for TDG?
TDG's best calendar year since 2020 was 2023, with a +60.9% return: $1,000 invested at the start of that year became about $1,609. Its worst year was 2026 (year to date), at -14.4%.
Does the calculator include dividends and splits?
Splits only. Price return: adjusted for stock splits, dividends not included. Prices are split-adjusted automatically; a ticker whose history we could not adjust with confidence starts later or is not shown.
How much would $100 per month in TDG have grown?
To about $11,688 from $8,000 invested, putting in $100 at every monthly close since 2020-03.
Did TDG beat the S&P 500?
Yes. From the March 2020 month-end through September 2026, TDG beat an S&P 500 index fund by 3.9%: $1,000 in the fund (the TSP C Fund, dividends included) became $3,252, and $1,000 in TDG (price only) became $3,379. The fund's monthly returns are published at tsp.gov.
Is this investment advice?
No. Wall Street Regrets is an entertainment and education tool. Every number here is a historical calculation, and past performance never guarantees future results.
Methodology
The figures on this page use TDG's historical price data from 2020-03 to 2026-10. The tables and the calculator above use month-end closes.
Prices come from IEX Historical Data. A "year" scenario invests $1,000 at the prior December's month-end close and values it at the latest close. Amounts in other currencies are converted at month-end exchange rates published by the European Central Bank and, for earlier years, the Federal Reserve: into US dollars at the buy date's rate and back at the sell date's rate, so the return includes the currency move.
Prices are the last regular-session trade on IEX (Investors Exchange) each day, which can differ slightly from the official close. Month-end closes miss the highs and lows inside a month. Figures ignore taxes, fees and the currency effects of non-USD listings.
What if you'd held…
Prices as of the last IEX trade on 2026-10-16. Data delayed end-of-day.