Stockbridge Partners LLC: TRANSDIGM GROUP INC (TDG): Quarterly 13F Position History
As of Q1 2026, Stockbridge Partners LLC reported 434,281 shares of TRANSDIGM GROUP INC (TDG), worth $503.3M and representing 12.2% of its 13F equity book. Quarter-over-quarter share count change: + 1 (+0.0%) . The position first appeared in Q2 2016 and has been disclosed across 40 13F-HR filings in Pactolio's tracked window.
- 434,281Shares Held (Latest Filing)
- $503.3MReported Market Value (Latest Filing)
- 12.2%Portfolio Weight (% of 13F Equity Book)
- +1Quarter-over-Quarter Share Change
- -$74.2MQuarter-over-Quarter Value Change
- 1,802,838Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 40 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 434,281 | +1 | +0.0% | $503.3M | 12.2% | $1159.0 |
| Q4 2025 | 434,280 | 90,953 | -17.3% | $577.5M | 12.7% | $1329.8 |
| Q3 2025 | 525,233 | 7,318 | -1.4% | $692.3M | 13.4% | $1318.0 |
| Q2 2025 | 532,551 | 45,700 | -7.9% | $809.8M | 15.8% | $1520.6 |
| Q1 2025 | 578,251 | 90,034 | -13.5% | $799.9M | 17.7% | $1383.3 |
| Q4 2024 | 668,285 | 38,053 | -5.4% | $846.9M | 18.0% | $1267.3 |
| Q3 2024 | 706,338 | 0 | — | $1.0B | 20.2% | $1427.1 |
| Q2 2024 | 706,338 | 63,710 | -8.3% | $902.4M | 18.7% | $1277.6 |
| Q1 2024 | 770,048 | 253,890 | -24.8% | $948.4M | 19.5% | $1231.6 |
| Q4 2023 | 1,023,938 | 147,981 | -12.6% | $1.0B | 22.1% | $1011.6 |
| Q3 2023 | 1,171,919 | 24,022 | -2.0% | $988.1M | 22.0% | $843.1 |
| Q2 2023 | 1,195,941 | 0 | — | $1.1B | 21.8% | $894.2 |
| Q1 2023 | 1,195,941 | 406,407 | -25.4% | $881.5M | 20.4% | $737.0 |
| Q4 2022 | 1,602,348 | 0 | — | $1.0B | 27.1% | $629.6 |
| Q3 2022 | 1,602,348 | 0 | — | $840.9M | 23.8% | $524.8 |
| Q2 2022 | 1,602,348 | +47,851 | +3.1% | $859.9M | 22.5% | $536.7 |
| Q1 2022 | 1,554,497 | 0 | — | $1.0B | 21.9% | $651.5 |
| Q4 2021 | 1,554,497 | 0 | — | $989.1M | 20.0% | $636.3 |
| Q3 2021 | 1,554,497 | 0 | — | $970.9M | 20.0% | $624.6 |
| Q2 2021 | 1,554,497 | 0 | — | $1.0B | 21.4% | $647.3 |
| Q1 2021 | 1,554,497 | 0 | — | $913.9M | 22.3% | $587.9 |
| Q4 2020 | 1,554,497 | 0 | — | $962.0M | 22.6% | $618.8 |
| Q3 2020 | 1,554,497 | +133,310 | +9.4% | $738.6M | 20.3% | $475.1 |
| Q2 2020 | 1,421,187 | +259,484 | +22.3% | $628.2M | 19.7% | $442.1 |
| Q1 2020 | 1,161,703 | +9,053 | +0.8% | $372.0M | 14.7% | $320.2 |
| Q4 2019 | 1,152,650 | 0 | — | $645.5M | 23.4% | $560.0 |
| Q3 2019 | 1,152,650 | 283,248 | -19.7% | $600.1M | 23.8% | $520.7 |
| Q2 2019 | 1,435,898 | 0 | — | $694.7M | 26.8% | $483.8 |
| Q1 2019 | 1,435,898 | 366,940 | -20.4% | $651.9M | 24.0% | $454.0 |
| Q4 2018 | 1,802,838 | 0 | — | $613.1M | 27.7% | $340.1 |
| Q3 2018 | 1,802,838 | 0 | — | $671.2M | 26.6% | $372.3 |
| Q2 2018 | 1,802,838 | 0 | — | $622.2M | 25.9% | $345.1 |
| Q1 2018 | 1,802,838 | 0 | — | $553.4M | 23.9% | $306.9 |
| Q4 2017 | 1,802,838 | 0 | — | $495.1M | 23.3% | $274.6 |
| Q3 2017 | 1,802,838 | 0 | — | $460.9M | 23.2% | $255.7 |
| Q2 2017 | 1,802,838 | 0 | — | $484.7M | 22.2% | $268.9 |
| Q1 2017 | 1,802,838 | +104,967 | +6.2% | $396.9M | 18.7% | $220.2 |
| Q4 2016 | 1,697,871 | +174,673 | +11.5% | $422.7M | 20.6% | $249.0 |
| Q3 2016 | 1,523,198 | 0 | — | $440.4M | 21.2% | $289.1 |
| Q2 2016 | 1,523,198 | — | — | $401.7M | 21.0% | $263.7 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Stockbridge Partners LLC first disclose a TDG position in 13F-HR filings?
Stockbridge Partners LLC first reported TRANSDIGM GROUP INC (TDG) on its 13F-HR filing for the period ending 2016-06-30 (Q2 2016). The position has appeared on 40 reported quarters within Pactolio's tracked window.
What was Stockbridge Partners LLC's most recent quarter-over-quarter share-count change in TDG?
Between Q4 2025 and Q1 2026, Stockbridge Partners LLC added 1 shares of TDG (+0.0%), bringing the total reported position to 434,281 shares at a market value of $503.3M.
Does the implied price-per-share represent Stockbridge Partners LLC's cost basis in TDG?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.