13F-HRCIK 0001222765
Last filed Aug 14, 2026Water Island Capital LLC·13F Holdings
$223.2M+128.2% vs prior quarter
- Positions
- 16
- Top-10 weight
- 98%
- Largest
- PEN · 21%
- Quarter ending
- Jun 30, 2026
- Added
- 11
- Trimmed
- 5
- Sold out
- 3
- Last filed
- Aug 14, 2026
Portfolio
What does Water Island Capital LLC own?
Water Island Capital LLC reported 16 long equity positions worth $223.2M for the quarter ending Jun 30, 2026. The largest is PEN at 21% of reported value. The ten largest positions make up 98% of the portfolio. Against the prior quarter it added to 11 positions, trimmed 5 and sold out of 3. The latest 13F was filed Aug 14, 2026.
Largest positionsValue · weight
- PENPenumbra Inc.$47.5M21% of portfolio
- NSCNorfolk Southern Corporation$46.0M21% of portfolio
- CZRCaesars Entertainment, Inc.$39.6M18% of portfolio
- DDominion Energy, Inc.$26.0M12% of portfolio
- TECHBio-Techne Corporation$23.7M11% of portfolio
- ROKURoku Inc$22.8M10% of portfolio
- KVUEKenvue Inc.$7.7M3.4% of portfolio
- GSATGlobalstar Inc.$2.5M1.1% of portfolio
- AESThe AES Corporation$2.5M1.1% of portfolio
- EQTEQT Corporation$1.3M0.6% of portfolio
Sector tilt
Which sectors does Water Island Capital LLC lean on?
Healthcare (32%) and Industrials (21%) are the two largest sectors by reported value.
By share of reported value, across 16 classified tickers.
Quarter changes
What did Water Island Capital LLC buy and sell last quarter?
Largest additions last quarterEst. value
Reported value
How has Water Island Capital LLC's 13F value moved?
Reported value went from $64.8M to $223.2M over 4 quarters. It moves with prices and with buying and selling, so it is not a fund return.
$64.8MDec 2022
$24.6MSep 2023
$97.8MMar 2026
$223.2MJun 2026
Latest 13F
What Water Island Capital LLC changed in its latest 13F
| Company | Change | Shares vs prior | Est. value | Filed |
|---|---|---|---|---|
| Caesars Entertainment, Inc. CZR | +4351% | $38.7M | Aug 14, 2026 | |
| Dominion Energy, Inc. D | New | $26.0M | Aug 14, 2026 | |
| Bio-Techne Corporation TECH | New | $23.7M | Aug 14, 2026 | |
| Roku Inc ROKU | New | $22.8M | Aug 14, 2026 | |
| Penumbra Inc. PEN | +25% | $9.6M | Aug 14, 2026 | |
| Kenvue Inc. KVUE | -43% | $5.7M | Aug 14, 2026 | |
| Norfolk Southern Corporation NSC | +9.1% | $3.8M | Aug 14, 2026 | |
| Globalstar Inc. GSAT | New | $2.5M | Aug 14, 2026 | |
| Dick's Sporting Goods Inc DKS | -89% | $1.1M | Aug 14, 2026 | |
| EQT Corporation EQT | +282% | $981K | Aug 14, 2026 | |
| Equitable Holdings Inc. EQH | New | $908K | Aug 14, 2026 | |
| The Boeing Company BA | -52% | $808K | Aug 14, 2026 | |
| Honeywell International Inc. HON | New | $560K | Aug 14, 2026 | |
| The Estée Lauder Companies Inc. EL | -100% | $538K | Aug 14, 2026 | |
| EchoStar Corporation ECHO | +113% | $457K | Aug 14, 2026 |
