Twin Securities, Inc. (CIK: 0001351351) is a financial institution headquartered at 152 West 57Th Street, 54Th Floor, New York, New York 10019. The firm regularly files Form 13F with the U.S. Securities and Exchange Commission (SEC), disclosing its equity holdings and investment positions.

As of the latest reporting period (2026-03-31), the institution manages a portfolio valued at $206.1 M, comprising 17 distinct securities. Over its filing history, it has submitted 52 Form 13F reports.

To view the institution’s full SEC filing history:
🔗 View All SEC Filings

Q1 2026 — Top-10 concentration: 98.3%. Quarterly turnover: 47.3%. ▲ 7 new, +6 added, −2 reduced, ×7 exited.

Top Buys

Q1 2026

1. EA Electronic Arts

+$42.22 M

2. CWAN Clearwater Analytics Holdings

+$26.36 M

3. HOLX Hologic

+$7.14 M

4. ACLX Arcellx

+$6.2 M

5. TERN Terns Pharmaceuticals

+$6.11 M

Top Sells

Q1 2026

1. CYBR Cyberark Software

−$59.39 M

2. EXAS Exact Sciences Corporation

−$49.11 M

3. CFLT Confluent

−$15.29 M

4. NSC Norfolk Southern Corporation

−$7.28 M

5. RNA Atrium Therapeutics

−$4.21 M

Stocks/ETFs

-22.51%

$202.31 M 98.16%

Options

+554.73%

$3.79 M 1.84%

Debt

$0 0.00%

Other

$0 0.00%

Name	Shares	Market Value	Weight	Change	Activity
Electronic Arts EA	446,948	$91.12 M	44.21%	▲ 207,112	Add 86.4%
Warner Bros Discovery WBD	1.3 M	$35.7 M	17.32%	▲ 184,926	Add 16.6%
Clearwater Analytics Holdings CWAN	1.16 M	$27.53 M	13.36%	▲ 1,114,776	Add 2260.6%
Hologic HOLX	179,036	$13.53 M	6.57%	▲ 94,523	Add 111.8%
Kenvue KVUE	480,517	$8.28 M	4.02%	▲ 74,934	Add 18.5%
Arcellx ACLX	53,982	$6.2 M	3.01%	▲ 53,982	New Buy
Terns Pharmaceuticals TERN	115,958	$6.11 M	2.97%	▲ 115,958	New Buy
Apellis Pharmaceuticals APLS	127,440	$5.13 M	2.49%	▲ 127,440	New Buy
Revolution Medicines RVMD	38,593	$3.75 M	1.82%	▲ 38,593	New Buy
Onestream OS	60,372	$1.45 M	0.70%	▲ 60,372	New Buy

View Full List

Twin Securities, Inc.'s Portfolio

This portfolio view aggregates one or more SEC Form 13F filings submitted by Twin Securities, Inc. each quarter. Holdings are organized into Stocks/ETFs, Options, Debt, and Other, with transaction markers indicating New Buy, Add, Reduce, No Change, or Sold Out. Reported anomalies are corrected where possible, and share counts are adjusted to reflect corporate actions such as stock splits. Since 2013, we have collected 52 quarters of portfolio data for this firm, providing a transparent record of institutional strategy over time.

Options Exposure History

CALL PUT

Report Date	Type	Underlying Shares	Notional Value	% Change

Report Date	Bought/Sold (Sh.)	% Change	Qtr. End Shares	Reported Price

Stocks ETFs

Name	Shares	Value	% of Portfolio	% Change
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CALL PUT

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Name	Amount	Value	% of Portfolio	% Change
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Twin Securities, Inc. Quarterly 13F Statistics

Discover detailed insights into Twin Securities, Inc.’s SEC Form 13F filings, including:

Quarterly changes in holdings
Portfolio turnover
Asset allocation trends
Top 10 stock and ETF positions

This page provides a transparent view of institutional strategies based on official SEC disclosures, helping investors track long‑term shifts since 2013.

Quarter	Holdings	Total Value	Turnover Rate	Asset Allocation	Top 10 Stock & ETF Holdings

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Twin Securities, Inc.'s All 13F Filings

This section lists all SEC Form 13F filings submitted by Twin Securities, Inc..

Form 13F must be filed within 45 days after the end of each calendar quarter and discloses the reporting manager, the securities held, their CUSIP numbers, the number of shares held at quarter-end, and the total reported market value.

Please note that the market value shown reflects reported holdings only and should not be considered a substitute for Assets Under Management (AUM), as cash positions are excluded.
Each filing entry includes a direct link to the original Form 13F document on the SEC’s EDGAR system .

Report For	Filed At	AUM	Holdings	Form Type	Source

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Insider Trading Activity (SEC Form 4)

This section tracks real-time insider transactions reported via SEC Form 4 filings. Unlike the quarterly 13F portfolio snapshots, these records reflect immediate buying and selling activity where the filer acts as a corporate insider. Use this data to spot timely market moves.

Date Top Line (Transaction Date): The date of the most recent insider transaction. Bottom Line (Filing Date): The date the transaction was filed with the SEC.	Value Total Value: The total monetary value of the transaction. (Shares × Price)	Shares Shares Traded: Number of shares bought or sold in this specific transaction. Adjusted for splits.	Position / Chg Top Line (Held): Total shares owned after the transaction. Bottom Line (Change %): The percentage change in holdings due to this trade.
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Data Source & Methodology: This table is sourced exclusively from SEC Form 4 filings and is adjusted for stock splits. It reflects active insider trading decisions and does not include passive beneficial ownership reported in 13F or 13D/G filings.

Twin Securities, Inc. 13F Filings, Portfolio & Analysis

Twin Securities, Inc. — Portfolio Overview & Company Profile

Portfolio Summary (Q1 2026)

Top Buys

Top Sells

Asset Allocation

Sector Allocation (Stocks)

Top Stock & ETF Holdings (Q1 2026)

Historical Portfolio Charts

Twin Securities, Inc.'s Portfolio

Twin Securities, Inc. Quarterly 13F Statistics

Twin Securities, Inc.'s All 13F Filings

Insider Trading Activity (SEC Form 4)