13F-HR filed by WATER ISLAND CAPITAL LLC
WATER ISLAND CAPITAL LLC filed this 13F-HR for the quarter ended 2026-03-31, filed 2026-05-15, with 98 holding rows worth $895,644,676.
- Accession
- 0001222765-26-000007
- Filer
- CIK 1222765
- Filed
- 2026-05-15
- Accepted by EDGAR
- acceptance time not in the bulk data set
- Ingested
- Source
- SEC quarterly data set
13F report for Q1 2026
A holdings report, 98 entries on the cover page, a total value of $895,644,676 stated on the cover page (in dollars after the unit check, H1), rows summing to $895,644,676 with VALUE read as dollars as filed, 13F file number 028-10693. The quarter's positions are built on this report. The resolved quarter.
The information table after summing rows of one CUSIP and put or call (H4), with the CUSIP and issuer name as filed. Values in dollars after the unit check (method).
| Issuer as filed | CUSIP | Class | Amount | Value | Value read as | Type |
|---|---|---|---|---|---|---|
| ELECTRONIC ARTS INC COM | 285512109 | Stock | 249,888 | $50,944,667 | dollars as filed | |
| JANUS HENDERSON GROUP PLC ORD SHS | G4474Y214 | Stock | 922,277 | $47,377,369 | dollars as filed | |
| WARNER BROS DISCOVERY INC COM SER A | 934423104 | Stock | 1,617,020 | $44,403,369 | dollars as filed | |
| HOLOGIC INC | 436440101 | COM | 560,045 | $42,333,801 | dollars as filed | |
| TXNM ENERGY INC COM | 69349H107 | Stock | 674,867 | $39,452,726 | dollars as filed | |
| PENUMBRA INC COM | 70975L107 | Stock | 120,095 | $39,435,596 | dollars as filed | |
| CHART INDS INC | 16115Q308 | COM | 189,939 | $39,269,891 | dollars as filed | |
| NORFOLK SOUTHN CORP COM | 655844108 | Stock | 134,051 | $38,472,637 | dollars as filed | |
| MASIMO CORP COM | 574795100 | Stock | 194,197 | $34,541,821 | dollars as filed | |
| ELECTRONIC ARTS INC | 285512959 | OPTION | 149,800 | $30,539,726 | dollars as filed | put |
| WEBSTER FINL CORP | 947890109 | COM | 415,823 | $28,866,433 | dollars as filed | |
| WARNER BROS DISCOVERY INC | 934423954 | PUT | 1,049,500 | $28,819,270 | dollars as filed | put |
| TRI POINTE HOMES INC | 87265H109 | COM | 536,367 | $25,064,430 | dollars as filed | |
| NATIONAL STORAGE AFFILIATES TR COM SHS BEN IN | 637870106 | REIT | 576,224 | $21,746,694 | dollars as filed | |
| Great Lakes Dredge & Dock Corp | 390607109 | Common Stock | 1,263,580 | $21,480,860 | dollars as filed | |
| ARCELLX INC COMMON STOCK | 03940C100 | Stock | 183,409 | $21,059,022 | dollars as filed | |
| Day One Biopharmaceuticals Inc | 23954D109 | Common Stock | 944,247 | $20,244,656 | dollars as filed | |
| DIGITALBRIDGE GROUP INC | 25401T603 | CL A NEW | 1,299,051 | $20,031,366 | dollars as filed | |
| DAY ONE BIOPHARMACEUTICALS I | 23954D959 | Equity Put | 839,700 | $18,003,168 | dollars as filed | put |
| STELLAR BANCORP INC | 858927106 | COM | 431,231 | $15,787,367 | dollars as filed | |
| ENHABIT INC | 29332G102 | COM | 984,611 | $13,873,170 | dollars as filed | |
| SILICON LABORATORIES INC COM | 826919102 | Stock | 58,417 | $12,159,499 | dollars as filed | |
| KENVUE INC | 49177J102 | COM | 700,600 | $12,078,345 | dollars as filed | |
| KENVUE INC | 49177J952 | COM | 700,600 | $12,078,344 | dollars as filed | put |
| VERIS RESIDENTIAL INC | 554489104 | COM | 597,390 | $11,272,750 | dollars as filed | |
| Peakstone Realty Trust | 39818P799 | REIT | 503,583 | $10,519,849 | dollars as filed | |
| TERNS PHARMACEUTICALS INC COM | 880881107 | Stock | 188,500 | $9,937,720 | dollars as filed | |
| TERNS PHARMACEUTICALS INC | 880881957 | Equity Put | 188,500 | $9,937,720 | dollars as filed | put |
| SILICON LABORATORIES INC | 826919952 | PUT | 47,600 | $9,907,940 | dollars as filed | put |
| KENNEDY-WILSON HOLDINGS INC | 489398107 | COM | 825,652 | $8,933,555 | dollars as filed | |
| ZIM INTEGRATED SHIPPING SERV | M9T951109 | SHS | 331,800 | $8,742,930 | dollars as filed | |
| ZIM INTEGRATED SHIPPING SERV | M9T951959 | PUT | 331,800 | $8,742,930 | dollars as filed | put |
| TXNM ENERGY INC | 69349HAF4 | NOTE 5.750% 6/0 | 6,000,000 | $8,098,750 | dollars as filed | principal |
| JANUS HENDERSON GROUP PLC | G4474Y954 | ORD SHS | 154,300 | $7,926,391 | dollars as filed | put |
| BANCO SANTANDER SA | 05964H905 | ADR | 681,700 | $7,689,576 | dollars as filed | call |
| UNIFIRST CORP MASS | 904708104 | COM | 25,743 | $6,476,681 | dollars as filed | |
| CSG SYS INTL INC | 126349AH2 | NOTE 3.875% 9/1 | 5,000,000 | $6,091,111 | dollars as filed | principal |
| AXALTA COATING SYS LTD COM | G0750C108 | Stock | 206,902 | $5,731,185 | dollars as filed | |
| AXALTA COATING SYS LTD | G0750C958 | PUT | 195,000 | $5,401,500 | dollars as filed | put |
| RAPID7 INC | 753422AF1 | NOTE 0.250% 3/1 | 5,501,530 | $4,863,227 | dollars as filed | principal |
| APELLIS PHARMACEUTICALS INC | 03753U106 | COM | 120,500 | $4,847,715 | dollars as filed | |
| APELLIS PHARMACEUTICALS INC | 03753U956 | Equity Put | 120,500 | $4,847,715 | dollars as filed | put |
| AIR LEASE CORP | 00912X302 | CL A | 73,131 | $4,749,127 | dollars as filed | |
| BENTLEY SYS INC | 08265TAD1 | NOTE 0.375% 7/0 | 5,000,000 | $4,747,188 | dollars as filed | principal |
| NUTANIX INC | 67059NAK4 | NOTE 0.500%12/1 | 5,000,000 | $4,514,886 | dollars as filed | principal |
| REDFIN CORP | 75737FAE8 | NOTE 0.500% 4/0 | 4,500,000 | $4,304,250 | dollars as filed | principal |
| HALOZYME THERAPEUTICS INC | 40637HAD1 | NOTE 0.250% 3/0 | 3,000,000 | $3,111,250 | dollars as filed | principal |
| AES CORP COM | 00130H105 | Stock | 185,833 | $2,618,387 | dollars as filed | |
| VARONIS SYS INC | 922280AD4 | NOTE 1.000% 9/1 | 3,000,000 | $2,614,696 | dollars as filed | principal |
| CLEARWATER ANALYTICS HLDGS I | 185123106 | CL A | 109,589 | $2,591,780 | dollars as filed | |
| SEALED AIR CORP NEW | 81211K100 | COM | 56,071 | $2,357,785 | dollars as filed | |
| ALLIED GOLD CORP | 01921D204 | COM NEW | 72,785 | $2,255,310 | dollars as filed | |
| ONESTREAM INC | 68278B107 | CL A | 91,120 | $2,186,880 | dollars as filed | |
| BRIGHTHOUSE FINL INC | 10922N103 | COM | 33,490 | $2,005,381 | dollars as filed | |
| NCR ATLEOS CORPORATION | 63001N106 | COM SHS | 38,939 | $1,696,962 | dollars as filed | |
| SELECT MED HLDGS CORP | 81619Q105 | COM | 103,467 | $1,685,477 | dollars as filed | |
| THERMON GROUP HLDGS INC | 88362T103 | COM | 32,987 | $1,662,545 | dollars as filed | |
| Sun Country Airlines Holding | 866683105 | COM | 98,859 | $1,633,151 | dollars as filed | |
| CENTESSA PHARMACEUTICALS PLC | 152309100 | SPONSORED ADS | 41,000 | $1,628,520 | dollars as filed | |
| CENTESSA PHARMACEUTICALS PLC | 152309950 | PUT | 41,000 | $1,628,520 | dollars as filed | put |
| CSG SYSTEMS | 126349109 | COM | 20,223 | $1,616,627 | dollars as filed | |
| SEMRUSH HLDGS INC CL A COM | 81686C104 | Stock | 133,872 | $1,598,432 | dollars as filed | |
| AMICUS THERAPEUTICS INC | 03152W109 | COM | 104,066 | $1,504,794 | dollars as filed | |
| Boeing Company | 097023105 | COM | 7,234 | $1,439,783 | dollars as filed | |
| SUNOPTA INC | 8676EP108 | COM | 196,514 | $1,273,411 | dollars as filed | |
| PROASSURANCE CORP | 74267C106 | COM | 51,103 | $1,263,266 | dollars as filed | |
| CANTALOUPE INC | 138103106 | COM | 107,867 | $1,166,042 | dollars as filed | |
| CLEAR CHANNEL OUTDOOR HLDGS | 18453H106 | COM | 478,517 | $1,134,085 | dollars as filed | |
| IHS HOLDING LIMITED | G4701H109 | ORD SHS | 137,615 | $1,132,571 | dollars as filed | |
| TALKSPACE INC | 87427V103 | COM | 216,158 | $1,118,618 | dollars as filed | |
| MISTER CAR WASH INC | 60646V105 | COM | 156,502 | $1,090,819 | dollars as filed | |
| DICKS SPORTING GOODS INC COM | 253393102 | Stock | 5,348 | $1,060,455 | dollars as filed | |
| GLADSTONE CAP CORP | 376535AG5 | NOTE 5.875%10/0 | 1,000,000 | $967,746 | dollars as filed | principal |
| COTERRA ENERGY INC COM | 127097103 | Stock | 27,292 | $959,041 | dollars as filed | |
| SKYWATER TECHNOLOGY INC COM | 83089J108 | Stock | 34,536 | $946,632 | dollars as filed | |
| NORTHWESTERN ENERGY GROUP INC COM NEW | 668074305 | Stock | 13,838 | $912,478 | dollars as filed | |
| AMNEAL PHARMACEUTICALS INC | 03168L105 | COM STK CL A | 68,400 | $850,212 | dollars as filed | |
| CAESARS ENTERTAINMENT INC NE | 12769G100 | COM | 29,500 | $779,685 | dollars as filed | |
| UDEMY INC COM | 902685106 | Stock | 139,335 | $643,728 | dollars as filed | |
| LAUDER ESTEE COS INC CL A | 518439104 | Stock | 7,500 | $538,275 | dollars as filed | |
| PENN ENTERTAINMENT INC COM | 707569109 | Stock | 35,000 | $526,050 | dollars as filed | |
| CALAVO GROWERS INC | 128246105 | COM | 20,321 | $524,079 | dollars as filed | |
| INTERNATIONAL MONEY EXPRESS | 46005L101 | COM | 33,122 | $523,328 | dollars as filed | |
| NATHANS FAMOUS INC NEW | 632347100 | COM | 4,994 | $503,046 | dollars as filed | |
| ON24 INC | 68339B104 | COM | 60,364 | $488,948 | dollars as filed | |
| Heritage Commerce Corp | 426927109 | Common Stock | 37,992 | $474,140 | dollars as filed | |
| BLUE FOUNDRY BANCORP | 09549B104 | COM | 35,658 | $472,112 | dollars as filed | |
| ECHOSTAR CORP | 278768106 | CL A | 4,000 | $468,280 | dollars as filed | |
| Flushing Financial Corp | 343873105 | Common Stock | 30,161 | $463,273 | dollars as filed | |
| UNITED AIRLS HLDGS INC COM | 910047109 | Stock | 5,000 | $460,350 | dollars as filed | |
| Diamond Hill Investment Group Inc | 25264R207 | Common Stock | 2,522 | $434,036 | dollars as filed | |
| First Foundation Inc | 32026V104 | Common Stock | 67,573 | $398,681 | dollars as filed | |
| ALASKA AIR GROUP INC COM | 011659109 | Stock | 10,265 | $377,547 | dollars as filed | |
| PACIFIC BIOSCIENCES CALIF INC COM | 69404D108 | Stock | 272,040 | $359,093 | dollars as filed | |
| VICTORY CAP HLDGS INC DEL COM CL A | 92645B103 | Stock | 5,120 | $335,258 | dollars as filed | |
| VIKING THERAPEUTICS INC | 92686J106 | COM | 10,280 | $334,511 | dollars as filed | |
| United Parcel Service,Inc. Class B | 911312106 | COM | 2,520 | $247,918 | dollars as filed | |
| PAYPALHLDGSINC | 70450Y103 | STOK | 5,124 | $231,759 | dollars as filed |
Amendment chain
| Filing | Role | Filed | Accepted | Ingested |
|---|---|---|---|---|
| 13F-HR 0001222765-26-000007 | this filing | 2026-05-15 | acceptance time not in the bulk data set |