Water Island Capital LLC holds a diversified book of 75 stocks worth $944.9M as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter they opened Taylor Morrison Home Corp and trimmed Janus Henderson Group PLC. Their largest long position is Taylor Morrison Home Corp at 6% of the equity book. They also disclosed $82.8M in put options (a bearish bet) and $47.4M in call options (bullish), shown separately below and excluded from the equity book.
Top-heavy: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
95% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Other tracked managers holding the same core names as Water Island Capital LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| BlackRock, Inc. | 74 / 75 | $67.8B |
| JPMORGAN CHASE & CO | 73 / 75 | $7.6B |
| CITIGROUP INC | 73 / 75 | $2.4B |
| WELLS FARGO & COMPANY/MN | 73 / 75 | $2.0B |
| STATE STREET CORP | 72 / 75 | $38.6B |
| MORGAN STANLEY | 72 / 75 | $11.9B |
| BANK OF AMERICA CORP /DE/ | 71 / 75 | $8.5B |
| ROYAL BANK OF CANADA | 71 / 75 | $2.3B |
Ranked by how many of Water Island Capital LLC's top 75 disclosed names each fund also holds: a cross-fund conviction signal from the latest 13F of every tracked manager.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Taylor Morrison Home Corp Equity | $52.2M | 727.5K | 5.5% | ▲New New position | |
| 2 | Electronic Arts Inc Equity | $51.9M | 252.9K | 5.5% | ▲+1.2% Added · +3K sh | |
| 3 | Chart Inds Inc Equity | $49.6M | 237.6K | 5.3% | ▲+25% Added · +48K sh | |
| 4 | Penumbra Inc Equity | $47.5M | 150.5K | 5.0% | ▲+25% Added · +30K sh | |
| 5 | Warner Bros Discovery Inc Equity | $46.4M | 1.74M | 4.9% | ▲+7.6% Added · +123K sh | |
| 6 | Janus Henderson Group PLC Equity | $46.3M | 890.9K | 4.9% | ▼−3.4% Reduced · −31K sh | |
| 7 | Norfolk Southn Corp Equity | $46.0M | 146.3K | 4.9% | ▲+9.1% Added · +12K sh | |
| 8 | TXNM Energy Inc Equity | $41.9M | 737.7K | 4.4% | ▲+9.3% Added · +63K sh | |
| 9 | Caesars Entertainment Inc Ne Equity | $39.6M | 1.31M | 4.2% | ▲45× Added · +1.3M sh | |
| 10 | Webster Finl Corp Equity | $33.4M | 437.2K | 3.5% | ▲+5.1% Added · +21K sh | |
| 11 | National Storage Affiliates Equity | $32.4M | 728.5K | 3.4% | ▲+26% Added · +152K sh | |
| 12 | Silicon Laboratories Inc Equity | $32.4M | 148.1K | 3.4% | ▲+154% Added · +90K sh | |
| 13 | Liveramp Hldgs Inc Equity | $30.3M | 805.3K | 3.2% | ▲New New position | |
| 14 | Catalyst Pharmaceuticals Inc Equity | $29.3M | 933.8K | 3.1% | ▲New New position | |
| 15 | Dominion Energy Inc Equity | $26.0M | 381.2K | 2.8% | ▲New New position | |
| 16 | Arcosa Inc Equity | $25.2M | 173.6K | 2.7% | ▲New New position | |
| 17 | Bio-Techne Corp Equity | $23.7M | 335.7K | 2.5% | ▲New New position | |
| 18 | Whitestone REIT Equity | $23.3M | 1.23M | 2.5% | ▲New New position | |
| 19 | Roku Inc Equity | $22.8M | 164.9K | 2.4% | ▲New New position | |
| 20 | Topbuild Cor Equity | $21.8M | 51.3K | 2.3% | ▲New New position | |
| 21 | Digitalbridge Group Inc Equity | $21.7M | 1.38M | 2.3% | ▲+6.0% Added · +77K sh | |
| 22 | Avanos Med Inc Equity | $19.9M | 799.0K | 2.1% | ▲New New position | |
| 23 | Sila Realty Trust Inc Equity | $18.9M | 623.9K | 2.0% | ▲New New position | |
| 24 | Organon & Co Equity | $18.6M | 1.37M | 2.0% | ▲New New position | |
| 25 | Stellar Bancorp Inc Equity | $15.1M | 383.2K | 1.6% | ▼−11% Reduced · −48K sh | |
| 26 | Nuvalent Inc Equity | $12.8M | 104.0K | 1.4% | ▲New New position | |
| 27 | Apogee Therapeutics Inc Equity | $12.6M | 94.9K | 1.3% | ▲New New position | |
| 28 | Xoma Royalty Corporation Equity | $10.3M | 242.0K | 1.1% | ▲New New position | |
| 29 | TXNM Energy Inc Convertible Bond | $7.8M | 6.00M | 0.8% | —Held | |
| 30 | Rapid7 Inc Convertible Bond | $7.8M | 8.50M | 0.8% | ▲+55% Added · +3.0M sh | |
| 31 | Kenvue Inc Equity | $7.7M | 402.0K | 0.8% | ▼−43% Reduced · −299K sh | |
| 32 | Varonis Sys Inc Convertible Bond | $4.9M | 5.00M | 0.5% | ▲+67% Added · +2.0M sh | |
| 33 | Bentley Sys Inc Convertible Bond | $4.8M | 5.00M | 0.5% | —Held | |
| 34 | Etsy Inc Convertible Bond | $4.7M | 5.00M | 0.5% | ▲New New position | |
| 35 | Alphabet Inc Convertible Preferred Stock | $4.3M | 85.0K | 0.5% | ▲New New position | |
| 36 | Redfin Corp Convertible Bond | $4.3M | 4.50M | 0.5% | —Held | |
| 37 | Snap Inc Convertible Bond | $4.1M | 5.00M | 0.4% | ▲New New position | |
| 38 | Axalta Coating Sys Ltd Equity | $3.3M | 97.5K | 0.4% | ▼−53% Reduced · −109K sh | |
| 39 | Globalstar Inc Equity | $2.5M | 30.7K | 0.3% | ▲New New position | |
| 40 | Aes Corp Equity | $2.5M | 167.6K | 0.3% | ▼−9.8% Reduced · −18K sh | |
| 41 | Unifirst Corp Mass Equity | $2.4M | 9.0K | 0.3% | ▼−65% Reduced · −17K sh | |
| 42 | Esperion Therapeutics Inc Ne Equity | $1.9M | 612.8K | 0.2% | ▲New New position | |
| 43 | Payoneer Global Inc Equity | $1.8M | 258.2K | 0.2% | ▲New New position | |
| 44 | NCR Atleos Corporation Equity | $1.8M | 41.9K | 0.2% | ▲+7.5% Added · +3K sh | |
| 45 | Brighthouse Finl Inc Equity | $1.8M | 28.3K | 0.2% | ▼−15% Reduced · −5K sh | |
| 46 | Qorvo Inc Equity | $1.8M | 19.1K | 0.2% | ▲New New position | |
| 47 | Allied Gold Corp Equity | $1.7M | 73.0K | 0.2% | ▲+0.3% Added · +231 sh | |
| 48 | Select Med Hldgs Corp Equity | $1.4M | 82.5K | 0.1% | ▼−20% Reduced · −21K sh | |
| 49 | Eqt Corp Equity | $1.3M | 25.0K | 0.1% | ▲New New position | |
| 50 | Talkspace Inc Equity | $1.3M | 242.7K | 0.1% | ▲+12% Added · +26K sh |
The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1222765/holdings"
Use Arkolith to show WATER ISLAND CAPITAL LLC's latest holdings, largest changes, and filing provenance.
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | WARNER BROS DISCOVERY INC | $40.7M | 1.5M |
| CALL · bullish | STATE STR SPDR S&P 500 ETF T | $33.6M | 45K |
| PUT · bearish | ORGANON & CO | $13.2M | 974K |
| PUT · bearish | STATE STR SPDR S&P 500 ETF T | $11.2M | 15K |
| CALL · bullish | NUVALENT INC | $10.4M | 84K |
| PUT · bearish | NUVALENT INC | $10.4M | 84K |
| PUT · bearish | LIVERAMP HLDGS INC | $4.4M | 117K |
| CALL · bullish | QXO INC | $3.5M | 200K |
| PUT · bearish | APOGEE THERAPEUTICS INC | $2.3M | 18K |
| PUT · bearish | VARONIS SYS INC | $629K | 15K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Aug 14, 2026 | 85 | $1.1B | 13F-HR |
| Q1 2026 | Mar 31, 2026 | May 15, 2026 | 98 | $895.6M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 17, 2026 | 91 | $927.6M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 14, 2025 | 84 | $793.3M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 14, 2025 | 76 | $702.0M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 15, 2025 | 84 | $764.1M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 13, 2025 | 78 | $925.7M | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Nov 14, 2024 | 75 | $986.6M | 13F-HR/A |
| Q1 2024 | Mar 31, 2024 | Nov 14, 2024 | 61 | $961.8M | 13F-HR/A |
| Q4 2023 | Dec 31, 2023 | Nov 14, 2024 | 58 | $1.0B | 13F-HR/A |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.