Twin Securities, Inc. holds a concentrated book of 16 stocks worth $202.3M as of Q1 2026 (disclosed May 15, 2026, a ~45-day 13F lag). This quarter they opened Arcellx Inc and trimmed Surgery Partners Inc. Their largest long position is Electronic Arts Inc at 45% of the equity book. They also disclosed $3.8M in put options (a bearish bet), shown separately below and excluded from the equity book.
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curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1351351/holdings"
Use Arkolith to show Twin Securities, Inc.'s latest holdings, largest changes, and filing provenance.
Top-heavy: concentrated book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
84% 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 Twin Securities, Inc.
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| VANGUARD GROUP INC | 22 / 16 | $40.5B |
| NORGES BANK | 20 / 16 | $6.6B |
| UBS Group AG | 18 / 16 | $4.7B |
| MORGAN STANLEY | 18 / 16 | $4.5B |
| JPMORGAN CHASE & CO | 18 / 16 | $4.2B |
| GOLDMAN SACHS GROUP INC | 18 / 16 | $3.1B |
| NORTHERN TRUST CORP | 18 / 16 | $3.1B |
| BANK OF AMERICA CORP /DE/ | 18 / 16 | $2.7B |
Ranked by how many of Twin Securities, Inc.'s top 16 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 | Electronic Arts Inc COM | $91.1M | 446.9K | 45.0% | ▲+86% Added · +207K sh | |
| 2 | Warner Bros Discovery Inc COM SER A | $35.7M | 1.30M | 17.6% | ▲+17% Added · +185K sh | |
| 3 | Clearwater Analytics Hldgs I CL A | $27.5M | 1.16M | 13.6% | ▲24× Added · +1.1M sh | |
| 4 | Hologic Inc COM | $13.5M | 179.0K | 6.7% | ▲+112% Added · +95K sh | |
| 5 | Kenvue Inc COM | $8.3M | 480.5K | 4.1% | ▲+18% Added · +75K sh | |
| 6 | Arcellx Inc COMMON STOCK | $6.2M | 54.0K | 3.1% | ▲New New position | |
| 7 | Terns Pharmaceuticals Inc COM | $6.1M | 116.0K | 3.0% | ▲New New position | |
| 8 | Apellis Pharmaceuticals Inc COM | $5.1M | 127.4K | 2.5% | ▲New New position | |
| 9 | Revolution Medicines Inc COM | $3.8M | 38.6K | 1.9% | ▲New New position | |
| 10 | Onestream Inc CL A | $1.4M | 60.4K | 0.7% | ▲New New position | |
| 11 | Take-Two Interactive Softwar COM | $1.3M | 6.5K | 0.6% | ▲New New position | |
| 12 | Day One Biopharmaceuticals I COM | $678K | 31.6K | 0.3% | ▲New New position | |
| 13 | Atrium Therapeutics Inc COM | $667K | 49.9K | 0.3% | ▲New New position | |
| 14 | Tic Solutions Inc COM | $509K | 77.3K | 0.3% | —Held | |
| 15 | Manchester Utd PLC New ORD CL A | $251K | 14.9K | 0.1% | ▲+2.4% Added · +350 sh | |
| 16 | Surgery Partners Inc COM | $119K | 10.0K | 0.1% | ▼−94% Reduced · −160K sh |
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | REVOLUTION MEDICINES INCRVMD | $3.8M | 39K |
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
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~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.