Institutional Manager · CIK 0001512805
Westchester Capital Management, LLC
VALHALLA, NY · File #028-14257
Latest AUM
$2.38B
Positions
778
Top-10 Concentration
56.3%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| EXITED | IB ACQUISITION CORP | 44934N108 | -349,019 | -$3.7M | $0 |
| EXITED | RF ACQUISITION CORP II | G75389109 | -250,000 | -$2.7M | $0 |
| ADD | GESHER ACQUISITION CORP. II | GSHRW | +199,406 | +$2.0M | +$1,826 |
| EXITED | MR COOPER GROUP INC | 62482R107 | -7,823 | -$1.6M | $0 |
| EXITED | KELLANOVA | 487836108 | -18,561 | -$1.5M | $0 |
| ADD | ELECTRONIC ARTS INC | EA | +5,370 | +$1.1M | +$2,459 |
| ADD | NORFOLK SOUTHN CORP | 655844108 | +2,752 | +$794,557 | -$16,074 |
| EXITED | ARIS WATER SOLUTIONS INC | 04041L106 | -30,255 | -$746,088 | $0 |
| NEW | EXACT SCIENCES CORP | 30063P105 | +7,175 | +$728,693 | $0 |
| EXITED | INTERPUBLIC GROUP COS INC | 460690100 | -24,979 | -$697,164 | $0 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 2025778 pos · $2.38B
- 13F HOLDINGS REPORTQ/E Sep 2025678 pos · $2.19B
- 13F HOLDINGS REPORTQ/E Jun 2025511 pos · $1.91B
- 13F HOLDINGS REPORTQ/E Mar 2025416 pos · $1.94B
- 13F HOLDINGS REPORTQ/E Dec 2024393 pos · $1.84B
- 13F HOLDINGS REPORTQ/E Sep 2024458 pos · $2.34B
- 13F HOLDINGS REPORTQ/E Jun 2024558 pos · $2.66B
- 13F HOLDINGS REPORTQ/E Mar 2024630 pos · $2.72B
- 13F HOLDINGS REPORTQ/E Dec 2023857 pos · $3.43B
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | CYBERARK SOFTWARE LTD | M2682V108 | 307,702 | $137.3M | 8.19% |
| 2 | SPDR S&P 500 ETF TR | SPY | 189,900 | $129.5M | 7.73% |
| 3 | ELECTRONIC ARTS INC | EA | 538,120 | $110.0M | 6.56% |
| 4 | NORFOLK SOUTHN CORP | 655844108 | 345,900 | $99.9M | 5.96% |
| 5 | CHART INDS INC | 16115Q308 | 465,060 | $95.9M | 5.72% |
| 6 | WARNER BROS DISCOVERY INC | WBD | 3,149,471 | $90.8M | 5.42% |
| 7 | FRONTIER COMMUNICATIONS PARE | 35909D109 | 2,135,760 | $81.3M | 4.85% |
| 8 | EXACT SCIENCES CORP | 30063P105 | 685,733 | $69.6M | 4.16% |
| 9 | TECK RESOURCES LTD | TCKRF | 1,394,330 | $66.8M | 3.98% |
| 10 | AVIDITY BIOSCIENCES INC | 05370A108 | 869,799 | $62.7M | 3.74% |
| 11 | TECK RESOURCES LTD | TCKRF | 1,145,200 | $54.8M | 3.27% |
| 12 | COMERICA INC | 200340107 | 616,492 | $53.6M | 3.20% |
| 13 | PROASSURANCE CORP | PRA | 1,440,196 | $34.8M | 2.08% |
| 14 | DAYFORCE INC | 15677J108 | 492,040 | $34.0M | 2.03% |
| 15 | SEALED AIR CORP NEW | SE | 772,365 | $32.0M | 1.91% |
| 16 | AA MISSION ACQUISITION CORP | YCY-WT | 2,653,972 | $28.3M | 1.69% |
| 17 | CONFLUENT INC | 20717M103 | 754,833 | $22.8M | 1.36% |
| 18 | LIBERTY BROADBAND CORP | LBRDP | 472,488 | $22.8M | 1.36% |
| 19 | NEW GOLD INC CDA | 644535106 | 2,555,590 | $22.3M | 1.33% |
| 20 | TEGNA INC | 87901J105 | 1,091,228 | $21.2M | 1.26% |