Stockbridge Partners (Robert Gibson & Sharlyn C. Heslam) latest 13F portfolio: 17 holdings worth $4.8B as of Q2 2026.
Backtested since 2020: mirroring Stockbridge Partners's reported 13F equity holdings each quarter would have returned +140.0% versus +182.3%for the S&P 500 (+14.8% annualized). See the Performance tab for the full equity curve.
Investor: Robert Gibson & Sharlyn C. Heslam
Number of Assets: 17
Reporting Period: Q2 - 2026
Holdings at Report: $4,753,238,742
Return $ Since Report: -$142,432,232
Return % Since Report: -3.00%
Company | Position | Activity | Shares | Port. % | Rep. Price | Curr. Price | Rep. Value | Curr. Value | Return Value | Return % |
|---|---|---|---|---|---|---|---|---|---|---|
| Martin Marietta Materials Inc. (MLM) | Equity | +31.78% | 42,450 | 0.52% | $576.70 | $490.64 | $24,480,915 | $20,827,668 | -$3,653,247 | -14.92% |
| Servicetitan Inc. (TTAN) | Equity | +100% | 188,565 | 0.28% | $70.71 | $55.04 | $13,333,431 | $10,378,618 | -$2,954,813 | -22.16% |
| Veeva Systems Inc. (VEEV) | Equity | +100% | 404,617 | 1.51% | $177.47 | $260.21 | $71,807,379 | $105,285,390 | +$33,478,011 | +46.62% |
| Waste Connections Inc. (WCN) | Equity | -52.63% | 1,161,217 | 4.07% | $166.69 | $155.33 | $193,563,262 | $180,371,837 | -$13,191,425 | -6.82% |
| Alphabet Inc. (GOOGL) | Equity | +28.30% | 1,252,838 | 9.42% | $357.37 | $349.54 | $447,726,716 | $437,916,995 | -$9,809,721 | -2.19% |
| Allison Transmission Holdings Inc. (ALSN) | Equity | +45.57% | 1,499,984 | 3.56% | $112.74 | $117.10 | $169,108,196 | $175,648,126 | +$6,539,930 | +3.87% |
| Deere & Company (DE) | Equity | +0.45% | 567,456 | 7.57% | $634.33 | $683.99 | $359,954,364 | $388,134,229 | +$28,179,865 | +7.83% |
| Formula One Group (FWONK) | Equity | +395.22% | 3,613,069 | 7.23% | $95.14 | $94.54 | $343,747,385 | $341,579,543 | -$2,167,842 | -0.63% |
| Nvidia Corp. (NVDA) | Equity | -15.46% | 1,295,226 | 5.45% | $200.09 | $222.27 | $259,161,770 | $287,889,883 | +$28,728,113 | +11.09% |
| Transdigm Group Inc. (TDG) | Equity | 0% | 434,281 | 12.17% | $1,332.04 | $1,086.05 | $578,479,663 | $471,650,880 | -$106,828,783 | -18.47% |
| Vulcan Materials Company (VMC) | Equity | -6.63% | 1,065,963 | 6.62% | $295.01 | $240.83 | $314,469,745 | $256,715,869 | -$57,753,876 | -18.37% |
| Amazon.com Inc. (AMZN) | Equity | -28.23% | 1,776,149 | 8.91% | $238.34 | $253.71 | $423,327,353 | $450,626,763 | +$27,299,410 | +6.45% |
| Guidewire Software Inc. (GWRE) | Equity | +456.92% | 759,827 | 1.97% | $123.05 | $144.29 | $93,496,712 | $109,635,438 | +$16,138,726 | +17.26% |
| Mastercard Inc. (MA) | Equity | +55.32% | 319,922 | 3.46% | $513.60 | $565.24 | $164,311,939 | $180,832,711 | +$16,520,772 | +10.05% |
| Taiwan Semiconductor Manufacturing Company Limited (TSM) | Equity | -3.66% | 2,072,924 | 20.83% | $477.57 | $434.67 | $989,966,315 | $901,037,875 | -$88,928,440 | -8.98% |
| Visa Inc. (V) | Equity | +65.17% | 557,138 | 4.02% | $343.09 | $368.29 | $191,148,476 | $205,188,354 | +$14,039,878 | +7.35% |
| Woodward Inc. (WWD) | Equity | +100% | 270,673 | 2.42% | $425.44 | $321.74 | $115,155,121 | $87,086,331 | -$28,068,790 | -24.37% |