WATER ISLAND CAPITAL LLC — 13F Holdings & Portfolio
CIK 1222765 · latest 13F-HR filed 2026-08-14
WATER ISLAND CAPITAL LLC manages $1.08B in 13F-reported U.S. long-equity assets across 85 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are TMHC (4.85%), EA (4.82%), GTLS (4.62%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 35 new positions, exited 46, added to 22, and trimmed 11.
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.
9TH FLOOR
NEW YORK, NY 10011
$1.08B
Long-equity book
85
Distinct positions
2026-06-30
Filed 2026-08-14
+35 / −46 / ↑22 / ↓11
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- CAESARS ENTERTAINMENT INC NE$38.8M +4982.6%
- SILICON LABORATORIES INC$20.2M +166.3%
- NATIONAL STORAGE AFFILIATES$10.6M +49.0%
- CHART INDS INC$10.4M +26.4%
- PENUMBRA INC$8.1M +20.5%
Top Trims
- KENVUE INC-$4.4M -36.4%
- UNIFIRST CORP MASS-$4.1M -63.1%
- AXALTA COATING SYS LTD-$2.4M -41.8%
- DICKS SPORTING GOODS INC-$924.4K -87.2%
- BOEING CO-$682.1K -47.4%
New Positions
- TAYLOR MORRISON HOME CORP$52.2M
- LIVERAMP HLDGS INC$30.3M
- CATALYST PHARMACEUTICALS INC$29.3M
- DOMINION ENERGY INC$26.0M
- ARCOSA INC$25.2M
Exited Positions
- HOLOGIC INC$42.3M
- MASIMO CORP$34.5M
- TRI POINTE HOMES INC$25.1M
- GREAT LAKES DREDGE & DOCK CO$21.5M
- ARCELLX INC$21.1M
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 | TAYLOR MORRISON HOME CORP | TMHC | 87724P106 | $52.2M | 4.85% | 727,492 | SH |
| 2 | ELECTRONIC ARTS INC | EA | 285512109 | $51.9M | 4.82% | 252,932 | SH |
| 3 | CHART INDS INC | GTLS | 16115Q308 | $49.6M | 4.62% | 237,599 | SH |
| 4 | PENUMBRA INC | PEN | 70975L107 | $47.5M | 4.42% | 150,456 | SH |
| 5 | WARNER BROS DISCOVERY INC | WBD | 934423104 | $46.4M | 4.32% | 1,740,468 | SH |
| 6 | JANUS HENDERSON GROUP PLC | JHG | G4474Y214 | $46.3M | 4.31% | 890,916 | SH |
| 7 | NORFOLK SOUTHN CORP | NSC | 655844108 | $46.0M | 4.28% | 146,283 | SH |
| 8 | TXNM ENERGY INC | TXNM | 69349H107 | $41.9M | 3.90% | 737,734 | SH |
| 9 | WARNER BROS DISCOVERY INC Put | — | 934423954 | $40.7M | 3.78% | 1,525,200 | SH |
| 10 | CAESARS ENTERTAINMENT INC NE | CZR | 12769G100 | $39.6M | 3.69% | 1,313,074 | SH |
| 11 | STATE STR SPDR S&P 500 ETF T Call | XCNY | 78462F903 | $33.6M | 3.13% | 45,000 | SH |
| 12 | WEBSTER FINL CORP | WBS | 947890109 | $33.4M | 3.11% | 437,210 | SH |
| 13 | NATIONAL STORAGE AFFILIATES | NSA | 637870106 | $32.4M | 3.01% | 728,454 | SH |
| 14 | SILICON LABORATORIES INC | SLAB | 826919102 | $32.4M | 3.01% | 148,138 | SH |
| 15 | LIVERAMP HLDGS INC | RAMP | 53815P108 | $30.3M | 2.82% | 805,327 | SH |
| 16 | CATALYST PHARMACEUTICALS INC | CPRX | 14888U101 | $29.3M | 2.73% | 933,819 | SH |
| 17 | DOMINION ENERGY INC | D | 25746U109 | $26.0M | 2.42% | 381,231 | SH |
| 18 | ARCOSA INC | ACA | 039653100 | $25.2M | 2.35% | 173,589 | SH |
| 19 | BIO-TECHNE CORP | TECH | 09073M104 | $23.7M | 2.21% | 335,727 | SH |
| 20 | WHITESTONE REIT | WSR | 966084204 | $23.3M | 2.17% | 1,227,709 | SH |
| 21 | ROKU INC | ROKU | 77543R102 | $22.8M | 2.12% | 164,890 | SH |
| 22 | TOPBUILD COR | COR | 89055F103 | $21.8M | 2.03% | 51,251 | SH |
| 23 | DIGITALBRIDGE GROUP INC | DBRG | 25401T603 | $21.7M | 2.02% | 1,376,380 | SH |
| 24 | AVANOS MED INC | AVNS | 05350V106 | $19.9M | 1.85% | 799,002 | SH |
| 25 | SILA REALTY TRUST INC | SILA | 146280508 | $18.9M | 1.76% | 623,872 | SH |
| 26 | ORGANON & CO | OGN | 68622V106 | $18.6M | 1.73% | 1,374,899 | SH |
| 27 | STELLAR BANCORP INC | STEL | 858927106 | $15.1M | 1.40% | 383,227 | SH |
| 28 | ORGANON & CO Put | OGN | 68622V956 | $13.2M | 1.23% | 974,200 | SH |
| 29 | NUVALENT INC | NUVL | 670703107 | $12.8M | 1.19% | 103,979 | SH |
| 30 | APOGEE THERAPEUTICS INC | APGE | 03770N101 | $12.6M | 1.17% | 94,900 | SH |
| 31 | STATE STR SPDR S&P 500 ETF T Put | XCNY | 78462F953 | $11.2M | 1.04% | 15,000 | SH |
| 32 | NUVALENT INC Call | NUVL | 670703907 | $10.4M | 0.96% | 84,000 | SH |
| 33 | NUVALENT INC Put | NUVL | 670703957 | $10.4M | 0.96% | 84,000 | SH |
| 34 | XOMA ROYALTY CORPORATION | XOMA | 98419J206 | $10.3M | 0.96% | 242,000 | SH |
| 35 | TXNM ENERGY INC | TXNM | 69349HAF4 | $7.8M | 0.73% | 6,000,000 | PRN |
| 36 | RAPID7 INC | RPD | 753422AF1 | $7.8M | 0.73% | 8,501,530 | PRN |
| 37 | KENVUE INC | KVUE | 49177J102 | $7.7M | 0.71% | 402,042 | SH |
| 38 | VARONIS SYS INC | VRNS | 922280AD4 | $4.9M | 0.45% | 5,000,000 | PRN |
| 39 | BENTLEY SYS INC | BSY | 08265TAD1 | $4.8M | 0.45% | 5,000,000 | PRN |
| 40 | ETSY INC | ETSY | 29786AAL0 | $4.7M | 0.44% | 5,000,000 | PRN |
| 41 | LIVERAMP HLDGS INC Put | — | 53815P958 | $4.4M | 0.41% | 117,100 | SH |
| 42 | ALPHABET INC | GOOGM | 02079K404 | $4.3M | 0.40% | 85,000 | SH |
| 43 | REDFIN CORP | RKT | 75737FAE8 | $4.3M | 0.40% | 4,500,000 | PRN |
| 44 | SNAP INC | SNAP | 83304AAK2 | $4.1M | 0.38% | 5,000,000 | PRN |
| 45 | QXO INC Call | QXO | 82846H905 | $3.5M | 0.32% | 200,000 | SH |
| 46 | AXALTA COATING SYS LTD | AXTA | G0750C108 | $3.3M | 0.31% | 97,500 | SH |
| 47 | GLOBALSTAR INC | GSAT | 378973507 | $2.5M | 0.23% | 30,668 | SH |
| 48 | AES CORP | AES | 00130H105 | $2.5M | 0.23% | 167,570 | SH |
| 49 | UNIFIRST CORP MASS | UNF | 904708104 | $2.4M | 0.22% | 9,045 | SH |
| 50 | APOGEE THERAPEUTICS INC Put | APGE | 03770N951 | $2.3M | 0.22% | 17,500 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $1.08B | 85 | 0001222765-26-000011 |
| 2026-03-31 | 2026-05-15 | $895.6M | 98 | 0001222765-26-000007 |
| 2025-12-31 | 2026-02-17 | $927.6M | 91 | 0001222765-26-000003 |
| 2025-09-30 | 2025-11-14 | $793.3M | 84 | 0001222765-25-000021 |