TRANSDIGM GROUP INC (TDG) Stock Institutional Trading Activity
TRANSDIGM GROUP INC (TDG) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Lone Pine Capital, Triple Frond Partners, Vulcan Value Partners, AltaRock Partners, and Renaissance Technologies LLC. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q2 2015 | Viking Global Investors | Buy | 458,176 | 458,176 | $102,938 |
| Q2 2015 | Tiger Global Management | Sell | -1,313,114 | 1,255,501 | $282,073 |
| Q1 2015 | AltaRock Partners | Buy | 76,666 | 231,750 | $50,688 |
| Q1 2015 | Renaissance Technologies LLC | Sell | -313,300 | 85,700 | $18,744 |
| Q1 2015 | Triple Frond Partners | Buy | 275,000 | 275,000 | $60,148 |
| Q1 2015 | Lone Pine Capital | Buy | 428,587 | 2,215,423 | $484,557 |
| Q1 2015 | Tiger Global Management | Buy | 25,003 | 2,568,615 | $561,807 |
| Q4 2014 | AltaRock Partners | Buy | 155,084 | 155,084 | $30,451 |
| Q4 2014 | Renaissance Technologies LLC | Buy | 377,700 | 399,000 | $78,344 |
| Q4 2014 | Tiger Global Management | Sell | -5,076 | 2,543,612 | $499,438 |
| Q3 2014 | Renaissance Technologies LLC | Sell | -12,117 | 21,300 | $3,926 |
| Q3 2014 | Lone Pine Capital | Buy | 807,441 | 1,786,836 | $329,367 |
| Q2 2014 | Lone Pine Capital | Sell | -54,523 | 979,395 | $163,814 |
| Q2 2014 | Tiger Global Management | Sell | -74,284 | 2,548,688 | $426,294 |
| Q1 2014 | Lone Pine Capital | Sell | -1,734,711 | 1,033,918 | $191,482 |
| Q4 2013 | Renaissance Technologies LLC | Sell | -4,183 | 33,417 | $5,381 |
| Q4 2013 | Tiger Global Management | Buy | 822,972 | 2,622,972 | $422,351 |
| Q4 2013 | Lone Pine Capital | Buy | 212,419 | 2,768,629 | $445,805 |
| Q3 2013 | Renaissance Technologies LLC | Buy | 23,000 | 37,600 | $5,215 |
| Q3 2013 | Tiger Global Management | Buy | 1,270,000 | 1,800,000 | $249,660 |
| Q2 2013 | Akre Capital Management | Buy | 10,000 | 10,000 | $1,568 |
| Q2 2013 | Renaissance Technologies LLC | Buy | 14,600 | 14,600 | $2,289 |
| Q2 2013 | Tiger Global Management | Buy | 530,000 | 530,000 | $83,088 |
| Q2 2013 | Lone Pine Capital | Buy | 2,556,210 | 2,556,210 | $400,737 |
Frequently asked questions about TDG activity
Which institutional owners are buying TDG?
Institutional owners buying TDG include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in TDG activity?
"Buy" means an investor increased their reported position in TDG compared to the prior reporting period. This reflects growing exposure to TRANSDIGM GROUP INC (TDG) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in TDG increasing?
Institutional interest in TDG can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.