Stockbridge Partners (Robert Gibson & Sharlyn C. Heslam) latest 13F portfolio: 16 holdings worth $4.1B as of Q1 2026.
Backtested since 2020: mirroring Stockbridge Partners's reported 13F equity holdings each quarter would have returned +146.1% versus +180.1%for the S&P 500 (+15.6% annualized). See the Performance tab for the full equity curve.
Investor: Robert Gibson & Sharlyn C. Heslam
Number of Assets: 16
Reporting Period: Q1 - 2026
Holdings at Report: $4,138,921,234
Return $ Since Report: +$506,127,751
Return % Since Report: +12.23%
Company | Position | Activity | Shares | Port. % | Rep. Price | Curr. Price | Rep. Value | Curr. Value | Return Value | Return % |
|---|---|---|---|---|---|---|---|---|---|---|
| Allison Transmission Holdings Inc. (ALSN) | Equity | +100% | 1,030,398 | 2.91% | $117.06 | $116.31 | $120,618,390 | $119,845,591 | -$772,799 | -0.64% |
| Alphabet Inc. (GOOGL) | Equity | +5.52% | 976,482 | 6.78% | $287.56 | $373.51 | $280,797,164 | $364,725,792 | +$83,928,628 | +29.89% |
| Amazon.com Inc. (AMZN) | Equity | +25.26% | 2,474,931 | 12.45% | $208.27 | $284.02 | $515,453,879 | $702,929,903 | +$187,476,024 | +36.37% |
| Deere & Company (DE) | Equity | -27.40% | 564,933 | 7.69% | $563.30 | $605.06 | $318,226,759 | $341,818,361 | +$23,591,602 | +7.41% |
| Guidewire Software Inc. (GWRE) | Equity | -90.56% | 136,435 | 0.49% | $149.56 | $157.33 | $20,405,219 | $21,465,319 | +$1,060,100 | +5.20% |
| KLA Corp. (KLAC) | Equity | -12.87% | 133,271 | 4.74% | $1,472.41 | $182.75 | $196,229,553 | $24,355,275 | -$171,874,278 | -87.59% |
| Formula One Group (FWONK) | Equity | +100% | 729,594 | 1.50% | $85.02 | $97.74 | $62,030,082 | $71,310,518 | +$9,280,436 | +14.96% |
| Martin Marietta Materials Inc. (MLM) | Equity | +100% | 32,213 | 0.46% | $588.68 | $542.27 | $18,963,149 | $17,468,144 | -$1,495,005 | -7.88% |
| Mastercard Inc. (MA) | Equity | +100% | 205,974 | 2.49% | $499.66 | $570.97 | $102,916,969 | $117,604,975 | +$14,688,006 | +14.27% |
| Microsoft Corp. (MSFT) | Equity | -29.77% | 525,737 | 4.70% | $370.17 | $487.65 | $194,612,065 | $256,375,648 | +$61,763,583 | +31.74% |
| Nvidia Corp. (NVDA) | Equity | +100% | 1,532,118 | 6.46% | $174.40 | $206.64 | $267,201,379 | $316,596,864 | +$49,395,485 | +18.49% |
| Taiwan Semiconductor Manufacturing Company Limited (TSM) | Equity | +1.45% | 2,151,675 | 17.57% | $337.95 | $406.11 | $727,158,566 | $873,816,734 | +$146,658,168 | +20.17% |
| Transdigm Group Inc. (TDG) | Equity | +0.00% | 434,281 | 12.16% | $1,158.96 | $1,285.56 | $503,314,308 | $558,294,282 | +$54,979,974 | +10.92% |
| Visa Inc. (V) | Equity | +100% | 337,310 | 2.46% | $302.24 | $365.67 | $101,948,574 | $123,344,148 | +$21,395,574 | +20.99% |
| Vulcan Materials Company (VMC) | Equity | -13.32% | 1,141,672 | 7.51% | $272.30 | $283.59 | $310,877,286 | $323,766,762 | +$12,889,476 | +4.15% |
| Waste Connections Inc. (WCN) | Equity | +3.54% | 2,451,169 | 9.62% | $162.44 | $167.81 | $398,167,892 | $411,330,670 | +$13,162,778 | +3.31% |