Twin Securities, Inc. holds a concentrated book of 11 reported positions worth $195.8M as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter they opened Apogee Therapeutics Inc and trimmed Warner Bros Discovery Inc. Their largest long position is Electronic Arts Inc at 55% of the reported non-option book. They also disclosed $27.6M in put options (a bearish bet), shown separately below and excluded from the non-option book. Cloning the disclosed picks since 2025 would be -8% (-7.6%/yr). That is a simulation of the disclosed long book, not audited returns.
Growth of $10,000 cloning Twin Securities, Inc.'s disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~45 days for the latest filing, with no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: concentrated book
Excluding Electronic Arts Inc (55% of the book), the rest is a concentrated book:
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
100% mapped to company sectors
+1 sector below the cut, under 0.5% together
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 (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as Twin Securities, Inc.
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Kryger Capital LLC | 8 / 11 | $848.9M |
| Harvest Management LLC | 8 / 11 | $103.2M |
| Marble Bar Asset Management LLP | 5 / 11 | $54.5M |
| Birnam Oak Advisors, LP | 6 / 11 | $229.8M |
| HBK Investments L P | 7 / 11 | $3.7B |
| Pentwater Capital Management LP | 6 / 11 | $5.9B |
| Sand Grove Capital Management LLP | 4 / 11 | $112.1M |
| Westchester Capital Management, LLC | 8 / 11 | $592.0M |
Ranked by the share of each fund's own book sitting in the names it shares with Twin Securities, Inc.: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each position's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Electronic Arts Inc COM | $108.4M | 528.4K | 55.3% | ▲+18% Added · +81K sh | |
| 2 | Warner Bros Discovery Inc COM SER A | $21.5M | 807.0K | 11.0% | ▼−38% Reduced · −493K sh | |
| 3 | Apogee Therapeutics Inc COM | $15.9M | 120.0K | 8.1% | ▲New New position | |
| 4 | Roku Inc COM CL A | $14.6M | 105.7K | 7.5% | ▲New New position | |
| 5 | Kenvue Inc COM | $14.4M | 755.0K | 7.4% | ▲+57% Added · +274K sh | |
| 6 | Topbuild Cor COM | $14.2M | 39.9K | 7.2% | ▲New New position | |
| 7 | Paramount Skydance Corp COM CL B | $3.3M | 334.7K | 1.7% | ▲New New position | |
| 8 | Organon & Co COMMON STOCK | $2.4M | 175.1K | 1.2% | ▲New New position | |
| 9 | Tic Solutions Inc COM | $626K | 77.3K | 0.3% | —Held | |
| 10 | Atrium Therapeutics Inc COM | $357K | 26.5K | 0.2% | ▼−47% Reduced · −23K sh | |
| 11 | Norfolk Southn Corp COM | $205K | 652 | 0.1% | ▲New New position |
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/1351351/holdings"
Use Arkolith to show Twin Securities, Inc.'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 INCWBD | $20.3M | 760K |
| PUT · bearish | ELECTRONIC ARTS INCEA | $7.4M | 36K |
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 non-option book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter. Raw filing totals can include option notional.
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. Book totals and portfolio weights cover reported non-option positions, which can include notes and warrants. Disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.