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Super Investors WATER ISLAND CAPITAL LLC
WI

WATER ISLAND CAPITAL LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$1.08B
Positions
85
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (53 quarters reported)

$3B $702M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q2 26

$2.05B in Q2 2013 → $1.08B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Taylor Morrison Home Corp 4.9% New 727,492 $52.2M
Electronic Arts Inc 4.8% Added 1.2% 252,932 $51.9M
CI Chart Inds Inc 4.6% Added 25% 237,599 $49.6M
Penumbra Inc 4.4% Added 25% 150,456 $47.5M
Warner Bros Discovery Inc 4.3% Added 7.6% 1,740,468 $46.4M
Janus Henderson Group PLC 4.3% Trimmed 3.4% 890,916 $46.3M
NS Norfolk Southn Corp 4.3% Added 9.1% 146,283 $46M
Txnm Energy Inc 3.9% Added 9.3% 737,734 $41.9M
Warner Bros Discovery Inc Put 3.8% Added 45% 1,525,200 $40.7M
CE Caesars Entertainment Inc Ne 3.7% Added 4351% 1,313,074 $39.6M
SS State Str SPDR S&P 500 ETF T Call 3.1% New 45,000 $33.6M
WF Webster Finl Corp 3.1% Added 5.1% 437,210 $33.4M
NS National Storage Affiliates 3.0% Added 26% 728,454 $32.4M
Silicon Laboratories Inc 3.0% Added 154% 148,138 $32.4M
LH Liveramp Hldgs Inc 2.8% New 805,327 $30.3M
Catalyst Pharmaceuticals Inc 2.7% New 933,819 $29.3M
Dominion Energy Inc 2.4% New 381,231 $26M
Arcosa Inc 2.3% New 173,589 $25.2M
Bio-techne Corp 2.2% New 335,727 $23.7M
Whitestone REIT 2.2% New 1,227,709 $23.3M
Roku Inc 2.1% New 164,890 $22.8M
TC Topbuild Cor 2.0% New 51,251 $21.8M
Digitalbridge Group Inc 2.0% Added 6.0% 1,376,380 $21.7M
AM Avanos Med Inc 1.8% New 799,002 $19.9M
Sila Realty Trust Inc 1.8% New 623,872 $18.9M
Organon & Co 1.7% New 1,374,899 $18.6M
Stellar Bancorp Inc 1.4% Trimmed 11% 383,227 $15.1M
Organon & Co Put 1.2% New 974,200 $13.2M
Nuvalent Inc 1.2% New 103,979 $12.8M
Apogee Therapeutics Inc 1.2% New 94,900 $12.6M
SS State Str SPDR S&P 500 ETF T Put 1.0% New 15,000 $11.2M
Nuvalent Inc Call 1.0% New 84,000 $10.4M
Nuvalent Inc Put 1.0% New 84,000 $10.4M
Xoma Royalty Corporation 1.0% New 242,000 $10.3M
Txnm Energy Inc 0.7% Unchanged 6,000,000 $7.85M
Rapid7 Inc 0.7% Added 55% 8,501,530 $7.83M
Kenvue Inc 0.7% Trimmed 43% 402,042 $7.68M
VS Varonis Sys Inc 0.5% Added 67% 5,000,000 $4.85M
BS Bentley Sys Inc 0.4% Unchanged 5,000,000 $4.8M
Etsy Inc 0.4% New 5,000,000 $4.73M
LH Liveramp Hldgs Inc Put 0.4% New 117,100 $4.41M
Alphabet Inc 0.4% New 85,000 $4.33M
Redfin Corp 0.4% Unchanged 4,500,000 $4.33M
Snap Inc 0.4% New 5,000,000 $4.07M
Qxo Inc Call 0.3% New 200,000 $3.46M
AC Axalta Coating Sys Ltd 0.3% Trimmed 53% 97,500 $3.34M
Globalstar Inc 0.2% New 30,668 $2.49M
Aes Corp 0.2% Trimmed 9.8% 167,570 $2.46M
UM Unifirst Corp Mass 0.2% Trimmed 65% 9,045 $2.39M
Apogee Therapeutics Inc Put 0.2% New 17,500 $2.32M
ET Esperion Therapeutics Inc Ne 0.2% New 612,774 $1.94M
Payoneer Global Inc 0.2% New 258,216 $1.84M
Ncr Atleos Corporation 0.2% Added 7.5% 41,860 $1.82M
BF Brighthouse Finl Inc 0.2% Trimmed 15% 28,329 $1.79M
Qorvo Inc 0.2% New 19,052 $1.78M
Allied Gold Corp 0.2% Added 0.3% 73,016 $1.73M
SM Select Med Hldgs Corp 0.1% Trimmed 20% 82,492 $1.36M
Eqt Corp 0.1% New 25,000 $1.33M
Talkspace Inc 0.1% Added 12% 242,655 $1.26M
Global Business Travel Group 0.1% New 133,456 $1.25M

Showing top 60 of 85 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

Company Action Shares changed Value of change % of portfolio
Taylor Morrison Home Corp New +727,492 +$52.2M 4.9%
Hologic Inc Exited −560,045 −$42.3M —
CE Caesars Entertainment Inc Ne Added +1,283,574 +$38.7M 3.7%
Masimo Corp Exited −194,197 −$34.5M —
SS State Str SPDR S&P 500 ETF T New +45,000 +$33.6M 3.1%
Electronic Arts Inc Exited −149,800 −$30.5M —
LH Liveramp Hldgs Inc New +805,327 +$30.3M 2.8%
Catalyst Pharmaceuticals Inc New +933,819 +$29.3M 2.7%
Dominion Energy Inc New +381,231 +$26M 2.4%
Arcosa Inc New +173,589 +$25.2M 2.3%

Showing the 10 largest of 139 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
Penumbra Inc New +120,095 +$39.4M 4.4%
Cyberark Software Ltd Exited −86,648 −$38.7M —
Exact Sciences Corp Exited −350,009 −$35.5M —
Comerica Inc Exited −398,037 −$34.6M —
Masimo Corp New +194,197 +$34.5M 3.9%
Cidara Therapeutics Inc Exited −150,708 −$33.3M —
Electronic Arts Inc New +149,800 +$30.5M 3.4%
WF Webster Finl Corp New +415,823 +$28.9M 3.2%
Warner Bros Discovery Inc Added +954,600 +$26.2M 3.2%
Tri Pointe Homes Inc New +536,367 +$25.1M 2.8%

Showing the 10 largest of 144 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
Exact Sciences Corp New +350,009 +$35.5M 3.8%
Hologic Inc New +467,742 +$34.8M 3.8%
Comerica Inc New +398,037 +$34.6M 3.7%
Cidara Therapeutics Inc New +150,708 +$33.3M 3.6%
Warner Bros Discovery Inc New +1,139,634 +$32.8M 3.5%
Verona Pharma PLC Exited −290,182 −$31M —
Janus Henderson Group PLC New +647,485 +$30.8M 3.3%
Avidxchange Holdings Inc Exited −2,882,867 −$28.7M —
Informatica Inc Exited −1,149,598 −$28.6M —
VH Veritex Hldgs Inc Exited −815,698 −$27.4M —

Showing the 10 largest of 136 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

Company Action Shares changed Value of change % of portfolio
Amedisys Inc Exited −561,814 −$55.3M —
Cyberark Software Ltd New +85,799 +$41.5M 5.2%
CN Chevron Corp New Exited −280,300 −$40.1M —
Ansys Inc Exited −113,285 −$39.8M —
NS Norfolk Southn Corp New +125,799 +$37.8M 4.8%
Juniper Networks Inc Exited −928,961 −$37.1M —
Hess Corp Exited −260,459 −$36.1M —
Springworks Therapeutics Inc Exited −703,525 −$33.1M —
Verona Pharma PLC New +290,182 +$31M 3.9%
D& Dun & Bradstreet Hldgs Inc Exited −3,147,738 −$28.6M —

Showing the 10 largest of 121 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
H & E Equipment Services Inc Exited −431,648 −$40.9M —
Kellanova Trimmed −437,923 −$34.8M 0.6%
EH Everi Hldgs Inc Exited −2,499,273 −$34.2M —
BR Beacon Roofing Supply Inc Exited −270,509 −$33.5M —
Springworks Therapeutics Inc New +703,525 +$33.1M 4.7%
SU Skechers U S A Inc New +426,562 +$26.9M 3.8%
US United States Stl Corp New Exited −531,400 −$22.5M —
H & E Equipment Services Inc Exited −231,400 −$21.9M —
PH Playa Hotels & Resorts Nv Exited −1,584,486 −$21.1M —
Informatica Inc New +806,228 +$19.6M 2.8%

Showing the 10 largest of 106 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
CN Chevron Corp New New +280,300 +$46.9M 6.1%
Hashicorp Inc Exited −1,284,797 −$44M —
EG Endeavor Group Hldgs Inc Exited −1,346,226 −$42.1M —
H & E Equipment Services Inc New +431,648 +$40.9M 5.4%
AC Albertsons Cos Inc Exited −1,862,712 −$36.6M —
BR Beacon Roofing Supply Inc New +270,509 +$33.5M 4.4%
Championx Corporation Trimmed −1,105,824 −$33M —
S Schlumberger Ltd Exited −817,200 −$31.3M —
Smartsheet Inc Exited −555,904 −$31.1M —
Hess Corp Trimmed −150,854 −$24.1M 5.4%

Showing the 10 largest of 105 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 13, 2025

Company Action Shares changed Value of change % of portfolio
Axonics Inc Exited −691,839 −$48.2M —
Squarespace Inc Exited −995,185 −$46.2M —
Marathon Oil Corp Exited −1,628,880 −$43.4M —
VH Vizio Hldg Corp Exited −3,353,047 −$37.5M —
Catalent Inc Exited −567,174 −$34.4M —
S Schlumberger Ltd New +817,200 +$31.3M 3.4%
RR R1 Rcm Inc Exited −2,034,317 −$28.8M —
Zuora Inc New +2,422,511 +$24M 2.6%
RO Retail Opportunity Invts Cor New +1,311,468 +$22.8M 2.5%
IH Instructure Hldgs Inc Exited −848,233 −$20M —

Showing the 10 largest of 104 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 14, 2024

Company Action Shares changed Value of change % of portfolio
Kellanova New +619,784 +$50M 5.0%
OH Olink Hldg Ab Exited −1,458,010 −$37.2M —
EH Everi Hldgs Inc New +2,554,217 +$33.6M 3.4%
CT Cerevel Therapeutics Hldng I Exited −766,933 −$31.4M —
RR R1 Rcm Inc New +2,034,317 +$28.8M 2.9%
Hibbett Inc Exited −235,072 −$20.5M —
IH Instructure Hldgs Inc New +848,233 +$20M 2.0%
Petiq Inc New +616,601 +$19M 1.9%
Nuvei Corporation Exited −542,700 −$17.6M —
Encore Wire Corp Exited −59,814 −$17.3M —

Showing the 10 largest of 101 changes.

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