Top Institutional Investors

Westchester Capital Management, LLC — 13F Holdings & Portfolio

CIK 1512805 · latest 13F-HR filed 2026-05-15

Backtest portfolio

Westchester Capital Management, LLC manages $2.21B in 13F-reported U.S. long-equity assets across 863 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are EA (6.23%), WBD (5.89%), NSC (5.84%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 64 new positions, exited 44, added to 34, and trimmed 61.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM

$2.21B

Long-equity book

Holdings

863

Distinct positions

Period

2026-03-31

Filed 2026-05-15

Q/Q Activity

+64 / −44 / ↑34 / ↓61

vs 2025-12-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • WARNER BROS DISCOVERY INC$38.5M +36.6%
  • NORFOLK SOUTHN CORP$32.1M +28.7%
  • ELECTRONIC ARTS INC$26.5M +21.8%
  • HOLOGIC INC$10.6M +44.5%
  • PIONEER ACQUISITION I CORP$8.7M +211.1%
Show all 34 →

Top Trims

  • LIBERTY BROADBAND CORP-$17.3M -67.3%
  • CANTALOUPE INC-$10.2M -68.8%
  • D. BORAL ARC ACQ I CORP.-$6.1M -61.1%
  • GP-ACT III ACQUISITION CORP-$5.2M -35.9%
  • SIM ACQUISITION CORP. I-$5.2M -38.6%
Show all 61 →

New Positions

  • WEBSTER FINL CORP$127.3M
  • UNIFIRST CORP MASS$65.0M
  • CLEARWATER ANALYTICS HLDGS I$61.9M
  • COTERRA ENERGY INC$55.8M
  • DIGITALBRIDGE GROUP INC$45.3M
Show all 64 →

Exited Positions

  • CYBERARK SOFTWARE LTD$146.2M
  • FRONTIER COMMUNICATIONS PARE$87.9M
  • EXACT SCIENCES CORP$76.3M
  • TECK RESOURCES LTD$75.0M
  • AVIDITY BIOSCIENCES INC$69.4M
Show all 44 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 ELECTRONIC ARTS INC EA 285512109 $137.5M 6.23% 674,256 SH
2 WARNER BROS DISCOVERY INC WBD 934423104 $130.1M 5.89% 4,737,453 SH
3 NORFOLK SOUTHN CORP NSC 655844108 $128.8M 5.84% 448,950 SH
4 WEBSTER FINL CORP WBS 947890109 $114.4M 5.18% 1,648,075 SH
5 CHART INDS INC GTLS 16115Q308 $96.2M 4.36% 465,060 SH
6 STATE STR SPDR S&P 500 ETF T Put SPY 78462F103 $92.5M 4.19% 142,300 SH
7 UNIFIRST CORP MASS UNF 904708104 $57.7M 2.61% 229,145 SH
8 CLEARWATER ANALYTICS HLDGS I CWAN 185123106 $55.1M 2.50% 2,329,278 SH
9 COTERRA ENERGY INC CTRA 127097103 $49.9M 2.26% 1,418,741 SH
10 DIGITALBRIDGE GROUP INC DBRG 25401T603 $41.5M 1.88% 2,691,553 SH
11 SEALED AIR CORP NEW SEE 81211K100 $36.4M 1.65% 864,532 SH
12 PROASSURANCE CORP PRA 74267C106 $32.6M 1.48% 1,319,318 SH
13 HOLOGIC INC HOLX 436440101 $30.5M 1.38% 402,984 SH
14 MASIMO CORP MASI 574795100 $22.3M 1.01% 125,201 SH
15 PENUMBRA INC PEN 70975L107 $22.2M 1.01% 67,564 SH
16 AGRICULTURE & NAT SOL ACQ CO ANSC G0131Y100 $22.1M 1.00% 1,957,555 SH
17 HAYMAKER ACQUISITION CORP IV HYAC G4375F108 $21.3M 0.96% 1,857,836 SH
18 AIR LEASE CORP AL 00912X302 $19.6M 0.89% 302,524 SH
19 QORVO INC QRVO 74736K101 $18.2M 0.82% 234,869 SH
20 DRUGS MADE IN AMER ACQUTN CO DMAA G2847J104 $17.3M 0.78% 1,643,934 SH
21 SIZZLE ACQUISITION CORP. II SZZL G8193F109 $14.9M 0.67% 1,449,689 SH
22 K&F GROWTH ACQUISITION CORP KFII G52258111 $14.8M 0.67% 1,418,954 SH
23 ONESTREAM INC OS 68278B107 $14.3M 0.65% 596,996 SH
24 NORFOLK SOUTHN CORP NSC 655844108 $13.6M 0.62% 47,523 SH
25 GLOBA TERRA ACQUISITION COR GTERA G3933N116 $13.2M 0.60% 1,289,139 SH
26 TITAN ACQUISITION CORP TACH G8901A103 $12.9M 0.59% 1,252,171 SH
27 KOCHAV DEFENSE ACQUI CO KCHV G5304D106 $12.4M 0.56% 1,212,848 SH
28 OYSTER ENTERPRISES II ACQUIS OYSE G6861F104 $12.3M 0.56% 1,202,048 SH
29 SOULPOWER ACQUISITION CORP SOUL G82745103 $12.3M 0.56% 1,195,602 SH
30 GIGCAPITAL8 CORP GIW G3864J100 $12.0M 0.55% 1,207,061 SH
31 JACKSON ACQUISITION CO II JACS G4992A110 $11.8M 0.54% 1,117,827 SH
32 PIONEER ACQUISITION I CORP PACH G7117W107 $11.7M 0.53% 1,152,746 SH
33 SIDDHI ACQUISITION CORP SDHI G8118C124 $11.6M 0.53% 1,121,204 SH
34 ALDEL FINL II INC ALDF G01558108 $11.6M 0.53% 1,100,357 SH
35 WEBSTER FINL CORP WBS 947890109 $11.6M 0.53% 167,414 SH
36 WARNER BROS DISCOVERY INC WBD 934423104 $11.4M 0.52% 415,224 SH
37 ANDRETTI ACQUISITION CORP II POLE G26745102 $11.1M 0.50% 1,041,853 SH
38 JANUS HENDERSON GROUP PLC JHG G4474Y214 $10.6M 0.48% 206,645 SH
39 NEW PROVIDENCE ACQUISITION C NPAC G6476A102 $10.5M 0.48% 1,028,209 SH
40 OXLEY BRIDGE ACQ LTD OBA G6858G107 $10.3M 0.47% 1,021,569 SH
41 ARTIUS II ACQUISITION INC AACB G0509J115 $9.8M 0.44% 943,963 SH
42 VOYAGER ACQUISITION CORP VACH G93A7H104 $9.7M 0.44% 903,284 SH
43 LAUNCH TWO ACQUISITION CORP. LPBB G5S87A105 $9.6M 0.43% 902,722 SH
44 PLUM ACQUISITION CORP IV PLMK G7134A104 $9.2M 0.42% 873,367 SH
45 CAL REDWOOD ACQUISITION CORP CRAQ G17564108 $9.2M 0.42% 907,714 SH
46 GP-ACT III ACQUISITION CORP GPAT G4035N103 $9.1M 0.41% 839,883 SH
47 APEX TREAS CORP APXT G04104108 $9.1M 0.41% 907,401 SH
48 ELECTRONIC ARTS INC EA 285512109 $8.9M 0.40% 43,426 SH
49 CHURCHILL CAPITAL CORP IX CCIX G21301109 $8.8M 0.40% 821,199 SH
50 ARCHIMEDES TECH SPAC PARTNER ATII G04537109 $8.7M 0.40% 840,153 SH
Filing History
Period Filed AUM Holdings Accession
2026-03-31 2026-05-15 $2.21B 863 0001512805-26-000005
2025-12-31 2026-02-13 $2.38B 778 0001512805-26-000002
2025-09-30 2025-11-14 $2.19B 678 0001628280-25-052144