Westchester Capital Management, LLC
13F filer · CIK 0001512805Reported Aug 14, 2026
Net seller this quarter
13F portfolio value$2.04BU.S. long equity reported on 13F
Positions27665 new · 60 closed
Net flow last quarter-$79.1MBuys minus sells
Top 10 positions weight48.8%Concentration
Holdings
13F · last 4 quarters freeScroll for earlier quarters
| Company | Value | % of portfolio | % of company | POSITION CHANGE qoq % | First reported |
|---|---|---|---|---|---|
| Q2 2026Reported Aug 14, 2026276 positions | |||||
| EAEAElectronic Arts Inc. | $169M | 8.29% | Not reported | +13.9% | Q3 2025 |
| $162M | 7.94% | 0.23% | +2.8% | Q3 2025 | |
| $152M | 7.46% | 0.23% | +9.2% | Q2 2022 | |
| CIGTLSChart Industries Inc | $128M | 6.28% | 1.28% | +23.7% | Q3 2025 |
| WFWBSWebster Financial Corp | $107M | 5.23% | 0.86% | -23.8% | Q1 2026 |
| $76M | 3.72% | 1.45% | +11.1% | Q1 2026 | |
| $58.3M | 2.86% | 2.03% | +25.8% | Q1 2026 | |
| $49.7M | 2.43% | 0.40% | +105.5% | Q1 2026 | |
| $49.7M | 2.43% | 0.60% | +101.8% | Q1 2026 | |
| $43.4M | 2.13% | 0.21% | New | Q2 2026 | |
| $41.6M | 2.04% | 0.68% | +532.5% | Q4 2017 | |
| ANANSCAgriculture & Natural Solutions Acquisition Corporation | $23.2M | 1.14% | Not reported | Not reported | Q1 2024 |
| $19.5M | 0.96% | 0.05% | +208.7% | Q4 2023 | |
| $19.3M | 0.95% | 0.54% | New | Q2 2026 | |
| SMSEMSelect Medical Holdings Corp | $16.2M | 0.79% | 0.79% | New | Q2 2026 |
| TBLDTopBuild Corp | $15.9M | 0.78% | 0.13% | New | Q2 2026 |
| KGKFIIK&F Growth Acquisition Corp. II | $15.6M | 0.76% | Not reported | Not reported | Q1 2025 |
| $14.9M | 0.73% | 0.14% | New | Q2 2026 | |
| $14.6M | 0.71% | Not reported | Not reported | Q3 2025 | |
| $13.4M | 0.65% | Not reported | Not reported | Q4 2025 | |
| $13.4M | 0.65% | Not reported | Not reported | Q3 2025 | |
| KDKCHVKochav Defense Acquisition Corp. | $13.3M | 0.65% | Not reported | Not reported | Q3 2025 |
| $13.2M | 0.65% | 4.99% | Not reported | Q3 2025 | |
| SASDHISiddhi Acquisition Corp (Cayman Islands) | $13M | 0.64% | Not reported | Not reported | Q2 2025 |
| PAPACHPioneer Acquisition I Corp | $12.9M | 0.63% | Not reported | Not reported | Q3 2025 |
| $12.6M | 0.62% | Not reported | Not reported | Q2 2025 | |
| $12.4M | 0.61% | 3.88% | Not reported | Q4 2024 | |
| $12.2M | 0.60% | Not reported | -24.8% | Q3 2022 | |
| $11.9M | 0.58% | Not reported | Not reported | Q4 2024 | |
| $11.7M | 0.57% | Not reported | Not reported | Q4 2025 | |
| $11.4M | 0.56% | Not reported | Not reported | Q3 2025 | |
| AIAACBArtius II Acquisition Inc. | $10.4M | 0.51% | Not reported | Not reported | Q2 2025 |
| $10.3M | 0.50% | Not reported | Not reported | Q3 2025 | |
| $10.2M | 0.50% | Not reported | Not reported | Q4 2024 | |
| $10.1M | 0.49% | Not reported | Not reported | Q4 2019 | |
| ATAPGEApogee Therapeutics, Inc. | $9.68M | 0.47% | 0.10% | New | Q2 2026 |
| NSNTWONewbury Street II Acquisition Corp | $9.55M | 0.47% | Not reported | Not reported | Q4 2024 |
| $9.45M | 0.46% | Not reported | Not reported | Q3 2025 | |
| $9.43M | 0.46% | Not reported | New | Q2 2026 | |
| GIGSRFGSR IV Acquisition Corp. | $9.14M | 0.45% | Not reported | Not reported | Q1 2026 |
| $9.05M | 0.44% | Not reported | -35.3% | Q3 2025 | |
| CACOPLCopley Acquisition Corp | $8.98M | 0.44% | Not reported | Not reported | Q2 2025 |
| $8.68M | 0.43% | Not reported | Not reported | Q2 2025 | |
| $8.51M | 0.42% | Not reported | Not reported | Q1 2026 | |
| $8.48M | 0.41% | Not reported | New | Q2 2026 | |
| $8.4M | 0.41% | Not reported | Not reported | Q4 2025 | |
| HAHAVAHarvard Ave Acquisition Corp | $8.07M | 0.40% | Not reported | +302.2% | Q4 2025 |
| $7.72M | 0.38% | Not reported | Not reported | Q4 2024 | |
| $7.5M | 0.37% | Not reported | Not reported | Q4 2025 | |
| $7.38M | 0.36% | 9.38% | Not reported | Q4 2025 | |
| Q1 2026Reported May 15, 2026269 positions | |||||
| EAEAElectronic Arts Inc. | $148M | 6.70% | Not reported | +22.1% | Q3 2025 |
| $144M | 6.52% | 0.22% | +29.4% | Q3 2025 | |
| $144M | 6.51% | 0.21% | +43.4% | Q2 2022 | |
| WFWBSWebster Financial Corp | $127M | 5.77% | 1.13% | New | Q1 2026 |
| CIGTLSChart Industries Inc | $103M | 4.65% | 1.04% | Not reported | Q3 2025 |
| $65M | 2.95% | 1.30% | New | Q1 2026 | |
| CACWANClearwater Analytics Holdings, Inc. | $61.9M | 2.80% | Not reported | New | Q1 2026 |
| CSCTRACentra Software Inc | $55.8M | 2.53% | Not reported | New | Q1 2026 |
| $45.3M | 2.05% | 1.61% | New | Q1 2026 | |
| SASEESealed Air Corp | $39.8M | 1.80% | 0.64% | +10.8% | Q1 2017 |
| PPRAProassurance Corp | $36M | 1.63% | 2.82% | -9.4% | Q1 2025 |
| HHOLXHologic Inc | $34.4M | 1.56% | 0.20% | +42.4% | Q4 2025 |
| $25.2M | 1.14% | 0.20% | New | Q1 2026 | |
| MMASIMasimo Corp | $24.6M | 1.12% | 0.27% | New | Q1 2026 |
| ANANSCAgriculture & Natural Solutions Acquisition Corporation | $23.1M | 1.04% | Not reported | +4.1% | Q1 2024 |
| HAHYACHaymaker Acquisition Corp. 4 | $22.2M | 1.01% | Not reported | Not reported | Q3 2018 |
| SAALSumisho Air Lease Corporation | $21.7M | 0.98% | 0.30% | Not reported | Q3 2025 |
| $20.4M | 0.93% | 0.30% | New | Q1 2026 | |
| $17.5M | 0.79% | 15.57% | Not reported | Q1 2025 | |
| $16M | 0.73% | Not reported | -0.2% | Q3 2022 | |
| KGKFIIK&F Growth Acquisition Corp. II | $15.4M | 0.70% | Not reported | -21.7% | Q1 2025 |
| $14.5M | 0.66% | Not reported | Not reported | Q3 2025 | |
| $13.9M | 0.63% | Not reported | Not reported | Q3 2025 | |
| $13.3M | 0.60% | Not reported | +23.2% | Q4 2025 | |
| $13.2M | 0.60% | Not reported | Not reported | Q3 2025 | |
| KDKCHVKochav Defense Acquisition Corp. | $13.2M | 0.60% | Not reported | Not reported | Q3 2025 |
| $13.1M | 0.59% | 4.99% | Not reported | Q3 2025 | |
| SASDHISiddhi Acquisition Corp (Cayman Islands) | $13M | 0.59% | Not reported | -7.4% | Q2 2025 |
| PAPACHPioneer Acquisition I Corp | $12.8M | 0.58% | Not reported | +208.0% | Q3 2025 |
| $12.6M | 0.57% | Not reported | Not reported | Q2 2025 | |
| $12.3M | 0.56% | 3.88% | Not reported | Q4 2024 | |
| $11.8M | 0.54% | Not reported | Not reported | Q4 2024 | |
| $11.6M | 0.52% | Not reported | -11.7% | Q4 2025 | |
| $11.3M | 0.51% | Not reported | +21.8% | Q3 2025 | |
| VAVACHVoyager Acquisition Corp./Cayman Islands | $10.3M | 0.47% | 3.80% | -23.8% | Q4 2024 |
| AIAACBArtius II Acquisition Inc. | $10.3M | 0.47% | Not reported | Not reported | Q2 2025 |
| $10.2M | 0.46% | Not reported | +53.9% | Q3 2025 | |
| $10.1M | 0.46% | Not reported | Not reported | Q4 2024 | |
| $9.99M | 0.45% | Not reported | +100.0% | Q4 2019 | |
| $9.73M | 0.44% | Not reported | -24.8% | Q1 2025 | |
| ATATIIArchimedes Tech SPAC Partners II Co. | $9.44M | 0.43% | 13.77% | Not reported | Q2 2025 |
| NSNTWONewbury Street II Acquisition Corp | $9.44M | 0.43% | Not reported | Not reported | Q4 2024 |
| MLMLACMountain Lake Acquisition Corp. | $9.35M | 0.42% | Not reported | Not reported | Q1 2025 |
| GIGPATGP-Act III Acquisition Corp. | $9.33M | 0.42% | Not reported | -36.7% | Q3 2024 |
| $9.32M | 0.42% | Not reported | Not reported | Q3 2025 | |
| APAPLSApellis Pharmaceuticals, Inc. | $9.15M | 0.41% | 0.18% | New | Q1 2026 |
| GIGSRFGSR IV Acquisition Corp. | $9.03M | 0.41% | Not reported | New | Q1 2026 |
| CACOPLCopley Acquisition Corp | $8.86M | 0.40% | Not reported | Not reported | Q2 2025 |
| $8.59M | 0.39% | Not reported | Not reported | Q2 2025 | |
| $8.43M | 0.38% | Not reported | New | Q1 2026 | |
| Q4 2025Reported Feb 13, 2026254 positions | |||||
| EAEAElectronic Arts Inc. | $121M | 5.10% | Not reported | +360.0% | Q3 2025 |
| $112M | 4.70% | 0.17% | +196.3% | Q3 2025 | |
| $105M | 4.42% | 0.15% | +185.5% | Q2 2022 | |
| CIGTLSChart Industries Inc | $102M | 4.30% | 1.10% | -9.7% | Q3 2025 |
| FCFYBRFrontier Communications Parent, Inc. | $87.9M | 3.69% | Not reported | +10.3% | Q3 2024 |
| $76.3M | 3.21% | 0.29% | New | Q4 2025 | |
| $75M | 3.15% | Not reported | -16.0% | Q2 2023 | |
| ABRNAMAvidity Biosciences, Inc. | $69.4M | 2.92% | 0.64% | New | Q4 2025 |
| CCMAComerica Inc | $57.2M | 2.40% | 0.52% | New | Q4 2025 |
| PPRAProassurance Corp | $38.8M | 1.63% | 3.12% | -8.8% | Q1 2025 |
| DDAYDayforce, Inc. | $37.8M | 1.59% | 0.34% | New | Q4 2025 |
| SASEESealed Air Corp | $35.4M | 1.49% | 0.58% | Not reported | Q1 2017 |
| AAAAMApollo Asset Management, Inc. | $28.8M | 1.21% | 270117.20% | Not reported | Q3 2024 |
| CCFLTConfluent, Inc. | $25.9M | 1.09% | 0.78% | New | Q4 2025 |
| LBLBRDALiberty Broadband Corp | $25.6M | 1.08% | Not reported | -29.8% | Q1 2025 |
| HHOLXHologic Inc | $23.8M | 1.00% | 0.14% | New | Q4 2025 |
| TTGNATegna Inc | $23.1M | 0.97% | Not reported | Not reported | Q4 2021 |
| HAHYACHaymaker Acquisition Corp. 4 | $22.1M | 0.93% | Not reported | Not reported | Q3 2018 |
| ANANSCAgriculture & Natural Solutions Acquisition Corporation | $21.9M | 0.92% | Not reported | -20.3% | Q1 2024 |
| SAALSumisho Air Lease Corporation | $21.5M | 0.90% | 0.30% | +117.6% | Q3 2025 |
| KGKFIIK&F Growth Acquisition Corp. II | $19.5M | 0.82% | Not reported | Not reported | Q1 2025 |
| $17.3M | 0.73% | 15.57% | Not reported | Q1 2025 | |
| $15.9M | 0.67% | Not reported | Not reported | Q3 2022 | |
| CCTLPCantaloupe, Inc. | $14.8M | 0.62% | Not reported | Not reported | Q2 2025 |
| GIGPATGP-Act III Acquisition Corp. | $14.6M | 0.61% | Not reported | +22.5% | Q3 2024 |
| $14.3M | 0.60% | Not reported | Not reported | Q3 2025 | |
| CFCADECadence Financial Corp | $14.1M | 0.59% | Not reported | Not reported | Q2 2021 |
| SASDHISiddhi Acquisition Corp (Cayman Islands) | $13.9M | 0.58% | Not reported | +103.9% | Q2 2025 |
| $13.8M | 0.58% | Not reported | Not reported | Q3 2025 | |
| VAVACHVoyager Acquisition Corp./Cayman Islands | $13.5M | 0.57% | 4.99% | Not reported | Q4 2024 |
| $13.5M | 0.57% | Not reported | Not reported | Q3 2024 | |
| $13.1M | 0.55% | Not reported | New | Q4 2025 | |
| $13.1M | 0.55% | Not reported | +191.0% | Q3 2025 | |
| TFTHSTreeHouse Foods, Inc. | $13.1M | 0.55% | 1.10% | New | Q4 2025 |
| KDKCHVKochav Defense Acquisition Corp. | $13M | 0.55% | Not reported | +349.7% | Q3 2025 |
| $13M | 0.55% | 206.34% | Not reported | Q3 2025 | |
| $12.8M | 0.54% | Not reported | Not reported | Q1 2025 | |
| $12.4M | 0.52% | Not reported | Not reported | Q2 2025 | |
| $12.2M | 0.51% | 3.88% | Not reported | Q4 2024 | |
| $11.7M | 0.49% | Not reported | -4.4% | Q4 2024 | |
| $10.7M | 0.45% | Not reported | New | Q4 2025 | |
| AIAACBArtius II Acquisition Inc. | $10.3M | 0.43% | Not reported | Not reported | Q2 2025 |
| DBBCARD. Boral ARC Acquisition I Corp. | $10.1M | 0.42% | 1002475.00% | -9.4% | Q3 2025 |
| $9.98M | 0.42% | Not reported | Not reported | Q4 2024 | |
| $9.6M | 0.40% | Not reported | -15.0% | Q4 2024 | |
| ATATIIArchimedes Tech SPAC Partners II Co. | $9.4M | 0.39% | 13.77% | +0.8% | Q2 2025 |
| NSNTWONewbury Street II Acquisition Corp | $9.39M | 0.39% | Not reported | Not reported | Q4 2024 |
| $9.28M | 0.39% | Not reported | +78.1% | Q3 2025 | |
| MLMLACMountain Lake Acquisition Corp. | $9.23M | 0.39% | Not reported | -24.9% | Q1 2025 |
| $9.23M | 0.39% | Not reported | +80.6% | Q3 2025 | |
| Q3 2025Reported Nov 14, 2025222 positions | |||||
| CBCOOPCooperative Bankshares Inc | $155M | 7.10% | Not reported | +47.7% | Q2 2025 |
| CIGTLSChart Industries Inc | $110M | 5.03% | 1.22% | New | Q3 2025 |
| $81.8M | 3.74% | Not reported | Not reported | Q2 2023 | |
| FCFYBRFrontier Communications Parent, Inc. | $78.2M | 3.58% | Not reported | -6.1% | Q3 2024 |
| ICIPGInterpublic Group of Companies, Inc. | $63.7M | 2.91% | 0.62% | +8.0% | Q4 2024 |
| VPVRNAVerona Pharma plc | $51.6M | 2.36% | 0.07% | New | Q3 2025 |
| LBLBRDALiberty Broadband Corp | $47.9M | 2.19% | Not reported | +1.8% | Q1 2025 |
| PPRAProassurance Corp | $42.3M | 1.93% | 3.43% | -1.4% | Q1 2025 |
| $39.3M | 1.80% | 0.06% | New | Q3 2025 | |
| AAAAMApollo Asset Management, Inc. | $28.4M | 1.30% | 270117.20% | +23.3% | Q3 2024 |
| ANANSCAgriculture & Natural Solutions Acquisition Corporation | $26.9M | 1.23% | Not reported | Not reported | Q1 2024 |
| EAEAElectronic Arts Inc. | $26.1M | 1.19% | Not reported | New | Q3 2025 |
| $25M | 1.14% | 0.05% | Not reported | Q2 2022 | |
| TTGNATegna Inc | $24.2M | 1.11% | Not reported | Not reported | Q4 2021 |
| HAHYACHaymaker Acquisition Corp. 4 | $22M | 1.01% | Not reported | +63.1% | Q3 2018 |
| KGKFIIK&F Growth Acquisition Corp. II | $19.3M | 0.88% | Not reported | Not reported | Q1 2025 |
| $17.1M | 0.78% | 15.87% | Not reported | Q1 2025 | |
| $15.8M | 0.72% | Not reported | +794.1% | Q3 2022 | |
| CCTLPCantaloupe, Inc. | $14.7M | 0.67% | Not reported | -2.9% | Q2 2025 |
| NENETDNabors Energy Transition Corp. II | $14.5M | 0.66% | Not reported | -12.9% | Q4 2023 |
| $14.1M | 0.65% | Not reported | New | Q3 2025 | |
| $13.6M | 0.62% | Not reported | New | Q3 2025 | |
| $13.3M | 0.61% | Not reported | +3.7% | Q3 2024 | |
| SASPRSpirit AeroSystems Holdings, Inc. | $13.3M | 0.61% | 0.29% | Not reported | Q2 2025 |
| VHVBTXVeritex Holdings, Inc. | $13.2M | 0.60% | 0.72% | New | Q3 2025 |
| VAVACHVoyager Acquisition Corp./Cayman Islands | $13.2M | 0.60% | 4.99% | Not reported | Q4 2024 |
| $13.2M | 0.60% | Not reported | -28.3% | Q4 2024 | |
| $13.1M | 0.60% | Not reported | -0.1% | Q2 2025 | |
| $12.9M | 0.59% | 206.34% | New | Q3 2025 | |
| $12.7M | 0.58% | Not reported | Not reported | Q1 2025 | |
| $12.5M | 0.57% | Not reported | New | Q3 2025 | |
| $12.3M | 0.56% | Not reported | Not reported | Q2 2025 | |
| MLMLACMountain Lake Acquisition Corp. | $12.2M | 0.56% | Not reported | Not reported | Q1 2025 |
| $12.2M | 0.56% | Not reported | Not reported | Q4 2024 | |
| $12.1M | 0.55% | 3.88% | Not reported | Q4 2024 | |
| GIGPATGP-Act III Acquisition Corp. | $11.8M | 0.54% | Not reported | -4.3% | Q3 2024 |
| $11.2M | 0.51% | Not reported | Not reported | Q4 2024 | |
| DBBCARD. Boral ARC Acquisition I Corp. | $11M | 0.50% | Not reported | New | Q3 2025 |
| MMRUSMerus N.V. | $10.7M | 0.49% | 0.15% | New | Q3 2025 |
| CHCHACCrane Harbor Acquisition Corp. | $10.4M | 0.47% | Not reported | New | Q3 2025 |
| KDKCHVUKochav Defense Acquisition Corp. | $10.2M | 0.47% | Not reported | Not reported | Q2 2025 |
| AIAACBArtius II Acquisition Inc. | $10.1M | 0.46% | Not reported | Not reported | Q2 2025 |
| $9.92M | 0.45% | Not reported | Not reported | Q4 2024 | |
| SAALSumisho Air Lease Corporation | $9.78M | 0.45% | 0.14% | New | Q3 2025 |
| NSNTWONewbury Street II Acquisition Corp | $9.3M | 0.43% | Not reported | +23.9% | Q4 2024 |
| ATATIIArchimedes Tech SPAC Partners II Co. | $9.19M | 0.42% | 13.66% | +38.5% | Q2 2025 |
| CACOPLCopley Acquisition Corp | $8.7M | 0.40% | Not reported | +700.6% | Q2 2025 |
| $8.67M | 0.40% | 0.21% | New | Q3 2025 | |
| PAPACHUPioneer Acquisition I Corp | $8.54M | 0.39% | Not reported | +240.0% | Q2 2025 |
| $8.5M | 0.39% | Not reported | Not reported | Q2 2025 | |
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