CIK: 0001505183
Total reported value
$4.1B
Reporting period: 2026-03-31 · Number of holdings: 16
Stockbridge Partners LLC disclosed 16 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $4.1B and a quarterly turnover rate of 47.4%.
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Stockbridge Partners LLC's disclosed holdings carry a Herfindahl concentration index of 0.098 — mathematically equivalent to about 10 equally-sized positions, close to its 16 actual disclosed holdings. Value is spread relatively evenly across the portfolio rather than concentrated in a handful of names.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.77), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
Recent activity leans toward adding more aggressively to already-large existing positions than to newly initiated ones (a 7.8 percentage-point tilt) — a pattern consistent with a momentum-following approach.
Trim GWRE
-90.6% -$270.1M
Add TSM
+1.5% $82.6M
Trim MSFT
-29.8% -$167.4M
Add AMZN
+25.3% $59.4M
Trim VMC
-13.3% -$64.8M
Add KLAC
-12.9% $10.4M
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | TSM | Taiwan Semiconductor-sp Adr | Stock-Tech | 17.57% | +3.38% | +1.45% | |
| 2 | AMZN | Amazon.com INC | Stock-Consumer Disc | 12.45% | +2.41% | +25.26% | |
| 3 | TDG | Transdigm Group INC | Stock-Industrials | 12.16% | -0.55% | +0.00% | |
| 4 | WCN | Waste Connections INC | Stock-Industrials | 9.62% | +0.48% | +3.54% | |
| 5 | DE | Deere & Co | Stock-Industrials | 7.69% | -0.28% | -27.40% | |
| 6 | VMC | Vulcan Materials Co | Stock-Materials | 7.51% | -0.76% | -13.32% | |
| 7 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 6.78% | +0.40% | +5.52% | |
| 8 | NVDA | Nvidia CORP | Stock-Tech | 6.46% | +6.46% | NEW | |
| 9 | KLAC | Kla CORP | Stock-Tech | 4.74% | +0.65% | -12.87% | |
| 10 | MSFT | Microsoft CORP | Stock-Tech | 4.70% | -3.27% | -29.77% | |
| 11 | ALSN | Allison Transmission Holding | Stock-Consumer Disc | 2.91% | +2.91% | NEW | |
| 12 | MA | Mastercard INC - A | Stock-Financials | 2.49% | +2.49% | NEW | |
| 13 | V | Visa Inc-class A Shares | Stock-Financials | 2.46% | +2.46% | NEW | |
| 14 | FWONK | Liberty Media Corp-formula-c | Stock-Comm Services | 1.50% | +1.50% | NEW | |
| 15 | GWRE | Guidewire Software INC | Stock-Tech | 0.49% | -5.90% | -90.56% | |
| 16 | MLM | Martin Marietta Materials | Stock-Materials | 0.46% | +0.46% | NEW |
Performance for Q3 2026
+0.1%
Performance Last 4 Quarters
-8.1%
Based on 60% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 16 | $4.1B | 47 | |
| 2025-12-31 | 13 | $4.5B | 30 | |
| 2025-09-30 | 14 | $5.2B | 36 | |
| 2025-06-30 | 12 | $5.1B | 0 | |
| 2025-03-31 | 12 | $4.5B | 100 | |
| 2024-12-31 | 12 | $4.7B | 0 | |
| 2024-09-30 | 13 | $5.0B | 0 | |
| 2024-06-30 | 13 | $4.8B | 0 | |
| 2024-03-31 | 13 | $4.9B | 0 | |
| 2023-12-31 | 14 | $4.7B | 0 | |
| 2023-09-30 | 15 | $4.5B | 0 | |
| 2023-06-30 | 15 | $4.9B | 0 | |
| 2023-03-31 | 15 | $4.3B | 0 | |
| 2022-12-31 | 14 | $3.7B | 0 | |
| 2022-09-30 | 16 | $3.5B | 0 | |
| 2022-06-30 | 17 | $3.8B | 0 | |
| 2022-03-31 | 17 | $4.6B | 0 | |
| 2021-12-31 | 17 | $5.0B | 0 | |
| 2021-09-30 | 19 | $4.9B | 0 | |
| 2021-06-30 | 16 | $4.7B | 93 | |
| 2021-03-31 | 15 | $4.1B | 100 | |
| 2020-12-31 | 14 | $4.2B | 0 | |
| 2020-09-30 | 11 | $3.6B | 27 | |
| 2020-06-30 | 14 | $3.2B | 40 | |
| 2020-03-31 | 15 | $2.5B | 41 | |
| 2019-12-31 | 12 | $2.8B | 13 | |
| 2019-09-30 | 10 | $2.5B | 21 | |
| 2019-06-30 | 12 | $2.6B | 18 | |
| 2019-03-31 | 14 | $2.7B | 27 | |
| 2018-12-31 | 12 | $2.2B | 25 | |
| 2018-09-30 | 15 | $2.5B | 15 | |
| 2018-06-30 | 16 | $2.4B | 15 | |
| 2018-03-31 | 16 | $2.3B | 26 | |
| 2017-12-31 | 15 | $2.1B | 23 | |
| 2017-09-30 | 14 | $2.0B | 26 | |
| 2017-06-30 | 13 | $2.2B | 18 | |
| 2017-03-31 | 13 | $2.1B | 36 | |
| 2016-12-31 | 13 | $2.1B | 28 | |
| 2016-09-30 | 15 | $2.1B | 23 | |
| 2016-06-30 | 13 | $1.9B | 30 | |
| 2016-03-31 | 14 | $1.9B | 15 | |
| 2015-12-31 | 13 | $1.8B | 30 | |
| 2015-09-30 | 17 | $1.8B | 23 | |
| 2015-06-30 | 16 | $1.9B | 14 | |
| 2015-03-31 | 15 | $1.9B | 38 | |
| 2014-12-31 | 15 | $1.9B | 21 | |
| 2014-09-30 | 15 | $1.8B | 34 | |
| 2014-06-30 | 14 | $1.7B | 21 | |
| 2014-03-31 | 15 | $1.5B | 52 | |
| 2013-12-31 | 15 | $1.4B | 24 | |
| 2013-09-30 | 14 | $1.2B | 28 | |
| 2013-06-30 | 16 | $1.2B | 0 |
Stockbridge Partners LLC's most significant position changes for 2026-03-31: Sold out: Veeva Systems Inc-class A (VEEV); Sold out: Servicenow INC (NOW); New buy: Nvidia CORP (NVDA); New buy: Allison Transmission Holding (ALSN); New buy: Mastercard INC - A (MA).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | TSM | Taiwan Semiconductor-sp Adr | +3.4% | +1.45% | Add |
| 2 | AMZN | Amazon.com INC | +2.4% | +25.26% | Add |
| 3 | KLAC | Kla CORP | +0.7% | -12.87% | Trim |
| 4 | WCN | Waste Connections INC | +0.5% | +3.54% | Add |
| 5 | GOOGL | Alphabet Inc-cl A | +0.4% | +5.52% | Add |
| 6 | DE | Deere & Co | -0.3% | -27.40% | Trim |
| 7 | TDG | Transdigm Group INC | -0.6% | +0.00% | Add |
| 8 | VMC | Vulcan Materials Co | -0.8% | -13.32% | Trim |
| 9 | MSFT | Microsoft CORP | -3.3% | -29.77% | Trim |
| 10 | GWRE | Guidewire Software INC | -5.9% | -90.56% | Trim |
| 11 | VEEV | Veeva Systems Inc-class A | — | EXIT | Sold out |
| 12 | NOW | Servicenow INC | — | EXIT | Sold out |
| 13 | NVDA | Nvidia CORP | — | NEW | New buy |
| 14 | ALSN | Allison Transmission Holding | — | NEW | New buy |
| 15 | MA | Mastercard INC - A | — | NEW | New buy |
| 16 | V | Visa Inc-class A Shares | — | NEW | New buy |
| 17 | FWONK | Liberty Media Corp-formula-c | — | NEW | New buy |
| 18 | MLM | Martin Marietta Materials | — | NEW | New buy |
| 19 | KLAR | Klarna Group plc | — | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-15 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-17 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-14 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-14 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-15 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-14 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-14 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-14 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-15 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-14 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-14 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-14 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-15 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-14 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-14 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-15 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-13 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-14 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-15 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-16 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-17 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-04-02 | Amendment | View on EDGAR |
| 2020-12-31 | 2021-02-16 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-16 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-14 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-15 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-14 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-14 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-14 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-15 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-14 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-14 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-14 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-15 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-14 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-14 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-14 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-15 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-15 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-15 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-16 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-16 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-16 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-14 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-15 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-17 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-11-14 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-14 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-05-15 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-02-14 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-11-14 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-08-14 | 13F-HR | View on EDGAR |
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