Stockbridge Partners LLC
In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 14, 2025), Stockbridge Partners LLC reported 14 stock positions worth $5.2 billion. Its top holding was Transdigm (TDG) at 13.4% of the portfolio, followed by Taiwan Semiconductor-SP ADR (TSM, 11.5%) and Amazon.com (AMZN, 10.3%). Compared with Q2 2025, it opened 2 new positions, added to 2 and reduced 10. The biggest buy was a new position in KLA (KLAC) and the biggest sale Thermo Fisher Scientific (TMO, shares −66%).
- Most Recent 13F
- Q2 2026
- Location
- Boston, MA
- CIK
- 0001505183
- Portfolio Value
- $5.2B (Q3 2025)
- SEC Filing
- 0000919574-25-006813 ↗ filed Nov 14, 2025
Holdings Value
Holdings 14 stocks · $5.2B
| TDG Transdigm Group Inc. | 13.39% | 525,233 | $692.3M | Reduce -1.4% |
| TSM Taiwan Semiconductor-SP ADR | 11.49% | 2,128,453 | $594.5M | Reduce -4.0% |
| AMZN Amazon.com Inc. | 10.30% | 2,426,541 | $532.8M | Reduce -2.3% |
| MSFT Microsoft Corp. | 9.32% | 930,812 | $482.1M | Reduce -8.2% |
| VMC Vulcan Materials Co. | 8.31% | 1,396,525 | $429.6M | Reduce -1.6% |
| WCN Waste Connections Inc. | 7.60% | 2,234,527 | $392.8M | Add +4.5% |
| VEEV Veeva Systems Inc. Class A | 7.52% | 1,306,224 | $389.1M | Reduce -16.3% |
| NOW ServiceNow Inc. | 7.47% | 419,795 | $386.3M | Add +96.8% |
| DE Deere & Co. | 7.05% | 797,359 | $364.6M | Reduce -4.6% |
| KLAC KLA Corp. | 6.48% | 310,675 | $335.1M | New |
| GWRE Guidewire Software Inc. | 4.62% | 1,039,356 | $238.9M | Reduce -16.7% |
| HLT Hilton Worldwide Holdings Inc. | 4.45% | 886,951 | $230.1M | Reduce -32.2% |
| TMO Thermo Fisher Scientific Inc. | 1.95% | 207,584 | $100.7M | Reduce -66.1% |
| KLAR Klarna Group PLC | 0.06% | 82,119 | $3.0M | New |
Portfolio Sells Q2 2025 → Q3 2025
| TMO Thermo Fisher Scientific Inc. | Reduce -66.1% | 1.95% | −2.90 |
| TDG Transdigm Group Inc. | Reduce -1.4% | 13.39% | −2.45 |
| HLT Hilton Worldwide Holdings Inc. | Reduce -32.2% | 4.45% | −2.36 |
| VEEV Veeva Systems Inc. Class A | Reduce -16.3% | 7.52% | −1.27 |
| DE Deere & Co. | Reduce -4.6% | 7.05% | −1.26 |
| GWRE Guidewire Software Inc. | Reduce -16.7% | 4.62% | −1.13 |
| MSFT Microsoft Corp. | Reduce -8.2% | 9.32% | −0.54 |
| AMZN Amazon.com Inc. | Reduce -2.3% | 10.30% | −0.35 |
| VMC Vulcan Materials Co. | Reduce -1.6% | 8.31% | +1.07 |
| TSM Taiwan Semiconductor-SP ADR | Reduce -4.0% | 11.49% | +1.67 |
Portfolio Buys Q2 2025 → Q3 2025
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 17 | $4.8B | TSM, TDG, GOOGL, AMZN, DE |
| Q1 2026 | 16 | $4.1B | TSM, AMZN, TDG, WCN, DE |
| Q4 2025 | 13 | $4.5B | TSM, TDG, AMZN, WCN, VMC |
| Q3 2025 | 14 | $5.2B | TDG, TSM, AMZN, MSFT, VMC |
| Q2 2025 | 12 | $5.1B | TDG, AMZN, MSFT, TSM, VEEV |
| Q1 2025 | 12 | $4.5B | TDG, AMZN, DE, WCN, MSFT |
| Q4 2024 | 12 | $4.7B | TDG, AMZN, GWRE, VMC, DE |
| Q3 2024 | 13 | $5.0B | TDG, AMZN, GWRE, VMC, DE |
| Q2 2024 | 13 | $4.8B | TDG, GWRE, AMZN, MSFT, NYT |
| Q1 2024 | 13 | $4.9B | TDG, AMZN, VMC, MSFT, TMO |