Water Island Capital Llc
Institutional manager — quarterly 13F holdings, Q ending 2026-03-31
Reported value
$895.6M
Q ending 2026-03-31
Prior quarter
$927.6M
Q ending 2025-12-31
Change
-3.4% QoQ · +17.2% YoY
Positions
98
reported holdings
Largest positions
All 98 reported positions, Q ending 2026-03-31. A manager can hold shares, calls and puts on the same security at once — such positions are listed as separate rows. Type: Shares = common stock, Put/Call = option positions (valued at the underlying), Principal = debt. Tickers link to stock pages where covered.
| Holding | Ticker | Type | Value ▼ | Shares |
|---|---|---|---|---|
| Electronic Arts Inc | EA | Shares | $50.9M | 250K |
| Janus Henderson Group Plc | Shares | $47.4M | 922K | |
| Warner Bros Discovery Inc | WBD | Shares | $44.4M | 1.6M |
| Hologic Inc | HOLX | Shares | $42.3M | 560K |
| Txnm Energy Inc | TXNM | Shares | $39.5M | 675K |
| Penumbra Inc | PEN | Shares | $39.4M | 120K |
| Chart Inds Inc | I3N | Shares | $39.3M | 190K |
| Norfolk Southn Corp | NSC | Shares | $38.5M | 134K |
| Masimo Corp | MASI* | Shares | $34.5M | 194K |
| Electronic Arts Inc | Put | $30.5M | 150K | |
| Webster Finl Corp | WBS | Shares | $28.9M | 416K |
| Warner Bros Discovery Inc | Put | $28.8M | 1.0M | |
| Tri Pointe Homes Inc | T86 | Shares | $25.1M | 536K |
| National Storage Affiliates | NSA | Shares | $21.7M | 576K |
| Great Lakes Dredge & Dock Co | GLDD | Shares | $21.5M | 1.3M |
| Arcellx Inc | ACLX | Shares | $21.1M | 183K |
| Day One Biopharmaceuticals I | DAWNGBX | Shares | $20.2M | 944K |
| Digitalbridge Group Inc | DBRG | Shares | $20.0M | 1.3M |
| Day One Biopharmaceuticals I | Put | $18.0M | 840K | |
| Stellar Bancorp Inc | Shares | $15.8M | 431K | |
| Enhabit Inc | EHABUSD | Shares | $13.9M | 985K |
| Silicon Laboratories Inc | SLAB | Shares | $12.2M | 58K |
| Kenvue Inc | KVUE | Shares | $12.1M | 701K |
| Kenvue Inc | Put | $12.1M | 701K | |
| Veris Residential Inc | Shares | $11.3M | 597K | |
| Peakstone Realty Trust | PKST | Shares | $10.5M | 504K |
| Terns Pharmaceuticals Inc | 430 | Shares | $9.9M | 189K |
| Terns Pharmaceuticals Inc | Put | $9.9M | 189K | |
| Silicon Laboratories Inc | Put | $9.9M | 48K | |
| Kennedy-Wilson Holdings Inc | Shares | $8.9M | 826K | |
| Zim Integrated Shipping Serv | Shares | $8.7M | 332K | |
| Zim Integrated Shipping Serv | Put | $8.7M | 332K | |
| Txnm Energy Inc | TXNM 5.75 06/01/54 | Principal | $8.1M | 6.0M |
| Janus Henderson Group Plc | Put | $7.9M | 154K | |
| Banco Santander Sa | Call | $7.7M | 682K | |
| Unifirst Corp Mass | UNF | Shares | $6.5M | 26K |
| Csg Sys Intl Inc | CSGS 3.875 09/15/28 | Principal | $6.1M | 5.0M |
| Axalta Coating Sys Ltd | Shares | $5.7M | 207K | |
| Axalta Coating Sys Ltd | Put | $5.4M | 195K | |
| Rapid7 Inc | RPD 0.25 03/15/27 | Principal | $4.9M | 5.5M |
| Apellis Pharmaceuticals Inc | APLS | Shares | $4.8M | 121K |
| Apellis Pharmaceuticals Inc | Put | $4.8M | 121K | |
| Air Lease Corp | AVLA | Shares | $4.7M | 73K |
| Bentley Sys Inc | BSY 0.375 07/01/27 | Principal | $4.7M | 5.0M |
| Nutanix Inc | NTNX 0.5 12/15/29 | Principal | $4.5M | 5.0M |
| Redfin Corp | RDFN 0.5 04/01/27 | Principal | $4.3M | 4.5M |
| Halozyme Therapeutics Inc | HALO 0.25 03/01/27 | Principal | $3.1M | 3.0M |
| Aes Corp | AES | Shares | $2.6M | 186K |
| Varonis Sys Inc | VRNS 1 09/15/29 | Principal | $2.6M | 3.0M |
| Clearwater Analytics Hldgs I | Shares | $2.6M | 110K | |
| Sealed Air Corp New | SDA | Shares | $2.4M | 56K |
| Allied Gold Corp | AAUC | Shares | $2.3M | 73K |
| Onestream Inc | K4F | Shares | $2.2M | 91K |
| Brighthouse Finl Inc | BHF | Shares | $2.0M | 33K |
| Ncr Atleos Corporation | NATL | Shares | $1.7M | 39K |
| Select Med Hldgs Corp | Shares | $1.7M | 103K | |
| Thermon Group Hldgs Inc | 8TG | Shares | $1.7M | 33K |
| Sun Ctry Airls Hldgs Inc | SNCY | Shares | $1.6M | 99K |
| Centessa Pharmaceuticals Plc | 260 | Shares | $1.6M | 41K |
| Centessa Pharmaceuticals Plc | Put | $1.6M | 41K | |
| Csg Sys Intl Inc | Shares | $1.6M | 20K | |
| Semrush Hldgs Inc | 628 | Shares | $1.6M | 134K |
| Amicus Therapeutic | AM6 | Shares | $1.5M | 104K |
| Boeing Co | BA | Shares | $1.4M | 7K |
| Sunopta Inc | STKL | Shares | $1.3M | 197K |
| Proassurance Corp | PRA | Shares | $1.3M | 51K |
| Cantaloupe Inc | UTE0 | Shares | $1.2M | 108K |
| Clear Channel Outdoor Hldgs | CCO | Shares | $1.1M | 479K |
| Ihs Holding Limited | Shares | $1.1M | 138K | |
| Talkspace Inc | TALK | Shares | $1.1M | 216K |
| Mister Car Wash Inc | Shares | $1.1M | 157K | |
| Dicks Sporting Goods Inc | DKS | Shares | $1.1M | 5K |
| Gladstone Cap Corp | GLAD 5.875 10/01/30 | Principal | $968K | 1.0M |
| Coterra Energy Inc | CTRA | Shares | $959K | 27K |
| Skywater Technology Inc | SKYT | Shares | $947K | 35K |
| Northwestern Energy Group In | NWE | Shares | $912K | 14K |
| Amneal Pharmaceuticals Inc | AMRX | Shares | $850K | 68K |
| Caesars Entertainment Inc Ne | CZR | Shares | $780K | 30K |
| Udemy Inc | 7WH | Shares | $644K | 139K |
| Lauder Estee Cos Inc | EL | Shares | $538K | 8K |
| Penn Entertainment Inc | PENN | Shares | $526K | 35K |
| Calavo Growers Inc | Shares | $524K | 20K | |
| International Money Express | IMXI | Shares | $523K | 33K |
| Nathans Famous Inc | NATH | Shares | $503K | 5K |
| On24 Inc | ONTF | Shares | $489K | 60K |
| Heritage Comm Corp | XHC | Shares | $474K | 38K |
| Blue Foundry Bancorp | BLFY | Shares | $472K | 36K |
| Echostar Corp | ECHO | Shares | $468K | 4K |
| Flushing Finl Corp | FL8 | Shares | $463K | 30K |
| United Airls Hldgs Inc | UAL | Shares | $460K | 5K |
| Diamond Hill Invt Group Inc | BVE | Shares | $434K | 3K |
| First Fndtn Inc | FFWM | Shares | $399K | 68K |
| Alaska Air Group Inc | ALK | Shares | $378K | 10K |
| Pacific Biosciences Calif In | PACB | Shares | $359K | 272K |
| Victory Cap Hldgs Inc Del | VCTR | Shares | $335K | 5K |
| Viking Therapeutics Inc | VKTX | Shares | $335K | 10K |
| United Parcel Svcs Inc | UPS | Shares | $248K | 3K |
| Paypal Hldgs Inc | PYPL | Shares | $232K | 5K |
Values as reported in public regulatory filings (USD); holdings are reported quarterly, up to 45 days after quarter end, and may contain reporting errors. Nothing here is investment advice.