WATER ISLAND CAPITAL LLC
Follow13F filer, CIK 1222765, NEW YORK, NY
WATER ISLAND CAPITAL LLC reported $927,601,491 across 91 holdings for the quarter ended 2025-12-31, in a 13F-HR filed 2026-02-17. Its ten largest share positions make up 43.58% of the portfolio.
Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001222765-26-000003
- Period
- 2025-12-31
- Reported value
- $928M
- Holdings
- 91
- Top 10 weight
- 43.58%
- New
- 61
- Sold out
- 54
Largest buys vs the previous quarter
| Security | Shares change | Approx. value |
|---|---|---|
| EXASnew | +350,009 | $35.5M |
| HOLXnew | +467,742 | $34.8M |
| CMAnew | +398,037 | $34.6M |
| CDTXnew | +150,708 | $33.3M |
| WBDnew | +1,139,634 | $32.8M |
Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.
Largest sells vs the previous quarter
| Security | Shares change | Approx. value |
|---|---|---|
| VERONA PHARMA PLCexited | -290,182 | -$31M |
| AVIDXCHANGE HOLDINGS INCexited | -2,882,867 | -$28.7M |
| INFORMATICA INCexited | -1,149,598 | -$28.6M |
| VERITEX HLDGS INCexited | -815,698 | -$27.4M |
| VERINT SYS INCexited | -1,202,967 | -$24.4M |
Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.
Holdings, Q4 2025
Share positions as resolved from 13F-HR 0001222765-26-000003, largest first. % of portfolio is the value over $818,612,069, the sum of the share positions whose value is usable for ratios (method).
| Security | History | Shares | Value | % of portfolio | Change | Latest event | Timeline |
|---|---|---|---|---|---|---|---|
| GTLSCHART INDS INC | 188,325 | $38.8M | 4.74% | +61,154 | Timeline | ||
| CYBERARK SOFTWARE LTD/ISRAELCYBERARK SOFTWARE LTD/ISRAEL | 86,648 | $38.7M | 4.72% | +849 | |||
| NSCNORFOLK SOUTHN CORP | 129,043 | $37.3M | 4.55% | +3,244 | Timeline | ||
| EAELECTRONIC ARTS INC | 180,838 | $37M | 4.51% | +92,248 | Timeline | ||
| EXASEXACT SCIENCES CORP | 350,009 | $35.5M | 4.34% | new | Timeline | ||
| HOLXHOLOGIC INC | 467,742 | $34.8M | 4.26% | new | Timeline | ||
| CMACOMERICA INC | 398,037 | $34.6M | 4.23% | new | Timeline | ||
| TXNMTXNM ENERGY INC | 576,411 | $33.9M | 4.15% | +125,751 | Timeline | ||
| CDTXCIDARA THERAPEUTICS INC | 150,708 | $33.3M | 4.07% | new | Timeline | ||
| WBDWARNER BROS DISCOVERY INC | 1,139,634 | $32.8M | 4.01% | new | Timeline | ||
| JHGJANUS HENDERSON GROUP PLC | 647,485 | $30.8M | 3.76% | new | Timeline | ||
| AVADEL PHARMACEUTICALSAVADEL PHARMACEUTICALS | 1,087,117 | $23.4M | 2.86% | new | |||
| SEESEALED AIR CORP NEW | 559,237 | $23.2M | 2.83% | new | Timeline | ||
| TGNATEGNA INC | 1,179,885 | $22.9M | 2.8% | -43,623 | Timeline | ||
| ASPEN INSURANCE HOLDINGS-AASPEN INSURANCE HOLDINGS-A | 572,685 | $21.2M | 2.6% | -47,564 | |||
| CWANCLEARWATER ANALYTICS HLDGS I | 875,632 | $21.1M | 2.58% | new | Timeline | ||
| SNVSYNOVUS FINANCIAL CORP | 403,650 | $20.2M | 2.47% | -17,850 | Timeline | ||
| CFLTCONFLUENT INC-CLASS A | 640,113 | $19.4M | 2.36% | new | Timeline | ||
| ALAIR LEASE CORP | 298,440 | $19.2M | 2.34% | -2,237 | Timeline | ||
| DBRGDIGITALBRIDGE GROUP INC | 929,000 | $14.3M | 1.74% | new | Timeline | ||
| JAMFJAMF HOLDING CORP | 985,069 | $12.8M | 1.57% | new | Timeline | ||
| CADECADENCE BANK | 297,603 | $12.7M | 1.56% | new | Timeline | ||
| HIHILLENBRAND INC | 399,006 | $12.7M | 1.55% | new | Timeline | ||
| PLYMPLYMOUTH INDUSTRIAL REIT INC | 559,215 | $12.2M | 1.49% | new | Timeline | ||
| RNAMAVIDITY BIOSCIENCES INC | 168,385 | $12.1M | 1.48% | new | Timeline | ||
| KVUEKENVUE INC | 690,191 | $11.9M | 1.45% | new | Timeline | ||
| CSGSCSG SYS INTL INC | 150,720 | $11.6M | 1.41% | new | Timeline | ||
| FOLDAMICUS THERAPEUTIC | 706,617 | $10.1M | 1.23% | new | Timeline | ||
| DVAXDYNAVAX TECHNOLOGIES CORP | 610,261 | $9.39M | 1.15% | new | Timeline | ||
| QRVOQORVO INC | 109,521 | $9.26M | 1.13% | new | Timeline | ||
| FRGEFORGE GLOBAL HOLDINGS INC | 197,075 | $8.78M | 1.07% | new | Timeline | ||
| ASTRIA THERAPEUTICS INCASTRIA THERAPEUTICS INC | 615,790 | $8.06M | 0.98% | new | |||
| SEMRSEMRUSH HLDGS INC | 628,602 | $7.47M | 0.91% | new | Timeline | ||
| AXTAAXALTA COATING SYS LTD | 205,722 | $6.65M | 0.81% | new | Timeline | ||
| HOUSANYWHERE REAL ESTATE INC | 444,821 | $6.3M | 0.77% | -11,779 | Timeline | ||
| BAPRABOEING CO | 80,000 | $5.52M | 0.67% | 0 | Timeline | ||
| ALEXALEXANDER & BALDWIN INC | 263,012 | $5.43M | 0.66% | new | Timeline | ||
| EBEVENTBRITE INC-CLASS A | 987,653 | $4.4M | 0.54% | new | Timeline | ||
| DAYDAYFORCE INC | 47,453 | $3.28M | 0.4% | -136,268 | Timeline | ||
| THSTREEHOUSE FOODS INC | 99,421 | $2.35M | 0.29% | new | Timeline | ||
| NGDNEW GOLD INC | 226,878 | $1.98M | 0.24% | new | Timeline | ||
| REVGREV GROUP INC | 31,261 | $1.9M | 0.23% | new | Timeline | ||
| BHFBRIGHTHOUSE FINL INC | 28,841 | $1.87M | 0.23% | new | Timeline | ||
| STAASTAAR SURGICAL CO | 67,862 | $1.57M | 0.19% | -590,455 | Timeline | ||
| WTRGESSENTIAL UTILS INC | 36,646 | $1.41M | 0.17% | new | Timeline | ||
| CTLPCANTALOUPE INC | 131,794 | $1.4M | 0.17% | -29,113 | Timeline | ||
| IMXIINTERNATIONAL MONEY EXPRESS | 88,476 | $1.36M | 0.17% | +2,301 | Timeline | ||
| DENNDENNY'S CORP | 213,445 | $1.33M | 0.16% | new | Timeline | ||
| PRAPROASSURANCE CORP | 46,992 | $1.14M | 0.14% | -163,469 | Timeline | ||
| NWENORTHWESTERN ENERGY GROUP IN | 14,307 | $923K | 0.11% | +4 | Timeline | ||
| MOFGMIDWESTONE FINANCIAL GROUP I | 21,980 | $846K | 0.1% | new | Timeline | ||
| UDMYUDEMY INC | 135,922 | $795K | 0.1% | new | Timeline | ||
| ZEUSOLYMPIC STEEL INC | 16,293 | $697K | 0.09% | new | Timeline | ||
| SOHO HOUSE & CO INCSOHO HOUSE & CO INC | 70,756 | $634K | 0.08% | +5,214 | |||
| CIOCITY OFFICE REIT INC | 61,498 | $430K | 0.05% | +7,181 | Timeline | ||
| DHILDIAMOND HILL INVT GROUP INC | 2,482 | $421K | 0.05% | new | Timeline | ||
| HTBKHERITAGE COMM CORP | 33,924 | $407K | 0.05% | new | Timeline | ||
| FFWMFIRST FNDTN INC | 65,919 | $406K | 0.05% | new | Timeline | ||
| TRUETRUECAR INC | 173,620 | $392K | 0.05% | new | Timeline | ||
| FSFGFIRST SAVINGS FINANCIAL GRP | 8,788 | $280K | 0.03% | new | Timeline | ||
| DKSDICKS SPORTING GOODS INC | 1,100 | $218K | 0.03% | new | Timeline |
Options
Puts and calls, as filed. The amount and value describe the underlying shares, not the option premium, so they stay out of % of portfolio (H5).
| Security | Type | Amount | Value | Change |
|---|---|---|---|---|
| STATE STR SPDR S&P 500 ETF TSTATE STR SPDR S&P 500 ETF T CALL | call | 25,000 | $17M | new |
| Cidara Therapeutics IncCidara Therapeutics Inc Equity Put | put | 76,900 | $17M | new |
| TECK RESOURCES LTDTECK RESOURCES LTD CL B | put | 292,100 | $14M | +82,500 |
| AVIDITY BIOSCIENCES INCAVIDITY BIOSCIENCES INC Put | put | 168,700 | $12.2M | new |
| KENVUE INCKENVUE INC COM | put | 695,000 | $12M | new |
| HILLENBRAND INCHILLENBRAND INC Cmn | put | 315,000 | $9.99M | new |
| AMICUS THERAPEUTICAMICUS THERAPEUTIC CALL | call | 451,000 | $6.42M | new |
| HOLOGIC INCHOLOGIC INC PUT | put | 60,600 | $4.51M | new |
| KIMBERLY-CLARK CORPKIMBERLY-CLARK CORP CALL | call | 42,200 | $4.26M | new |
| WARNER BROS DISCOVERY INCWARNER BROS DISCOVERY INC PUT | put | 94,900 | $2.74M | new |
| AXALTA COATING SYS LTDAXALTA COATING SYS LTD PUT | put | 67,100 | $2.17M | new |
| CORE SCIENTIFIC INC NEWCORE SCIENTIFIC INC NEW CALL | call | 143,800 | $2.09M | new |
| KENVUE INCKENVUE INC COM | call | 118,400 | $2.04M | new |
| REALOGY HOLDINGS CORPREALOGY HOLDINGS CORP COM | call | 71,100 | $1.01M | new |
| REALOGY HOLDINGS CORPREALOGY HOLDINGS CORP Cmn | put | 71,100 | $1.01M | -385,500 |
| JANUS HENDERSON GROUP PLCJANUS HENDERSON GROUP PLC ORD SHS | put | 12,000 | $571K | new |
Principal amounts
Notes and convertibles filed as a face amount (PRN). A face amount is never added to a share count (H6).
| Security | Type | Amount | Value | Change |
|---|---|---|---|---|
| CSG SYS INTL INCCSG SYS INTL INC NOTE 3.875% 9/1 | principal | 5,000,000 | $5.97M | new |
| SPOTIFY USA INCSPOTIFY USA INC NOTE 3/1 | principal | 5,000,000 | $5.67M | 0 |
| RAPID7 INCRAPID7 INC NOTE 0.250% 3/1 | principal | 5,501,530 | $5.1M | +3,001,530 |
| CONFLUENT INCCONFLUENT INC NOTE 1/1 | principal | 5,000,000 | $4.86M | new |
| BENTLEY SYS INCBENTLEY SYS INC NOTE 0.375% 7/0 | principal | 5,000,000 | $4.71M | 0 |
| REDFIN CORPREDFIN CORP NOTE 0.500% 4/0 | principal | 4,500,000 | $4.22M | 0 |
| TXNM ENERGY INCTXNM ENERGY INC NOTE 5.750% 6/0 | principal | 3,000,000 | $4.04M | 0 |
| NUTANIX INCNUTANIX INC NOTE 0.500%12/1 | principal | 3,500,000 | $3.38M | new |
| HALOZYME THERAPEUTICS INCHALOZYME THERAPEUTICS INC NOTE 0.250% 3/0 | principal | 3,000,000 | $3.23M | 0 |
| BLACKLINE INCBLACKLINE INC NOTE 3/1 | principal | 3,071,000 | $3.03M | 0 |
| VARONIS SYS INCVARONIS SYS INC NOTE 1.000% 9/1 | principal | 3,000,000 | $2.79M | new |
| ITRON INCITRON INC NOTE 3/1 | principal | 2,500,000 | $2.47M | new |
| GLADSTONE CAP CORPGLADSTONE CAP CORP NOTE 5.875%10/0 | principal | 2,000,000 | $1.99M | 0 |
| EVOLENT HEALTH INCEVOLENT HEALTH INC NOTE 3.500%12/0 | principal | 2,000,000 | $1.35M | 0 |
Sold out in Q4 2025
Positions in the previous quarter's report that this quarter's report no longer lists.
| Security | Shares before | Value before | Type |
|---|---|---|---|
| VERONA PHARMA PLCVERONA PHARMA PLC | 290,182 | $31M | shares |
| AVIDXCHANGE HOLDINGS INCAVIDXCHANGE HOLDINGS INC | 2,882,867 | $28.7M | shares |
| INFORMATICA INCINFORMATICA INC | 1,149,598 | $28.6M | shares |
| VERITEX HLDGS INCVERITEX HLDGS INC | 815,698 | $27.4M | shares |
| VERINT SYS INCVERINT SYS INC | 1,202,967 | $24.4M | shares |
| POTBELLY CORPPOTBELLY CORP | 1,351,588 | $23M | shares |
| WNS HLDGS LTD COM SHSWNS HLDGS LTD COM SHS | 296,042 | $22.6M | shares |
| SYNOVUS FINL CORPSYNOVUS FINL CORP | 421,500 | $20.7M | put |
| CORE SCIENTIFIC INC NEWCORE SCIENTIFIC INC NEW | 1,042,000 | $18.7M | put |
| MERIDIANLINK INCMERIDIANLINK INC | 930,234 | $18.5M | shares |
| SAPIENS INTERNATIONAL CORPSAPIENS INTERNATIONAL CORP | 421,434 | $18.1M | shares |
| HANESBRANDS INCHANESBRANDS INC | 2,264,676 | $14.9M | shares |
| CORZCORE SCIENTIFIC INC NEW | 785,446 | $14.1M | shares |
| VIMEO INCVIMEO INC | 1,555,942 | $12.1M | shares |
| MGRCMCGRATH RENTCORP | 99,363 | $11.6M | shares |
| PROPROS Holdings Inc | 492,502 | $11.3M | shares |
| INTEGRAL AD SCIENCE HLDNG COINTEGRAL AD SCIENCE HLDNG CO | 1,071,160 | $10.9M | shares |
| TECKTECK RESOURCES LTD | 209,900 | $9.21M | shares |
| MERUS N VMERUS N V | 96,000 | $9.04M | shares |
| MERUS N VMERUS N V | 96,000 | $9.04M | put |
| VERONA PHARMA PLCVERONA PHARMA PLC | 84,100 | $8.97M | put |
| KELLOGG COKELLOGG CO | 108,800 | $8.92M | call |
| WIDEOPENWEST INCWIDEOPENWEST INC | 1,558,174 | $8.04M | shares |
| PREMIER INCPREMIER INC | 278,420 | $7.74M | shares |
| 89BIO INC89BIO INC | 493,500 | $7.25M | call |
| PGREPARAMOUNT GROUP INC | 958,918 | $6.27M | shares |
| UBER TECHNOLOGIES INCUBER TECHNOLOGIES INC | 5,000,000 | $6.09M | principal |
| COMPASS INCCOMPASS INC | 655,600 | $5.26M | call |
| AKAMAI TECHNOLOGIES INCAKAMAI TECHNOLOGIES INC | 4,500,000 | $4.31M | principal |
| CUREVAC NVCUREVAC NV | 762,138 | $4.11M | shares |
| DEXCOM INCDEXCOM INC | 3,500,000 | $3.2M | principal |
| VERINT SYSTEMS INCVERINT SYSTEMS INC | 3,000,000 | $2.94M | principal |
| Sandstorm Gold LtdSandstorm Gold Ltd | 214,205 | $2.68M | shares |
| Tourmaline Bio IncTourmaline Bio Inc | 50,968 | $2.44M | shares |
| LBRDKLIBERTY BROADBAND CORP | 35,810 | $2.28M | shares |
| INTERPUBLIC GROUP COSINTERPUBLIC GROUP COS | 63,104 | $1.76M | shares |
| SCSSTEELCASE INC-CLASS A | 94,905 | $1.63M | shares |
| FUBOTV INCFUBOTV INC | 1,591,000 | $1.58M | principal |
| ZIMVIE INCZIMVIE INC | 72,353 | $1.37M | shares |
| MAC Copper LtdMAC Copper Ltd | 103,254 | $1.26M | shares |
| LIVE NATION ENTERTAINMENT INLIVE NATION ENTERTAINMENT IN | 7,500 | $1.23M | call |
| AMWDAMERICAN WOODMARK CORP | 18,336 | $1.22M | shares |
| REDWOOD TRUST INCREDWOOD TRUST INC | 1,000,000 | $1.02M | principal |
| MTSRMETSERA INC | 18,730 | $980K | shares |
| METSERA INCMETSERA INC | 18,700 | $979K | put |
| MRC GLOBAL INCMRC GLOBAL INC | 58,605 | $845K | shares |
| CCRNCROSS CTRY HEALTHCARE INC | 42,897 | $609K | shares |
| PERFORMANT HEALTHCARE INCPERFORMANT HEALTHCARE INC | 72,772 | $563K | shares |
| BRYBerry Corp | 142,979 | $540K | shares |
| PROVIDENT BANCORP INCPROVIDENT BANCORP INC | 40,282 | $505K | shares |
| CORECARD CORPORATIONCORECARD CORPORATION | 16,595 | $447K | shares |
| HARBORONE BANCORP INC NEWHARBORONE BANCORP INC NEW | 22,464 | $306K | shares |
| AURAAURA BIOSCIENCES INC | 10,372 | $64.1K | shares |
| PACBPACIFIC BIOSCIENCES CALIF IN | 35,754 | $45.8K | shares |
How Q4 2025 was built
Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).
| Filing | Role | Amendment | Filed | Accepted | Ingested |
|---|---|---|---|---|---|
| 13F-HR 0001222765-26-000003 | base | 2026-02-17 | acceptance time not in the bulk data set |