Twin Securities, Inc.

New York, NY · CIK 1351351 · 13F filing filed 2026-08-14

SEC-registered investment adviser since 2012 · corporation

As an employer

$195.8m reported value -3.2% vs Q1 2026

11positions

99.9%in top 10

6 new 2 added 2 reduced 11 sold out vs Q1 2026

Options: 0 call positions (— notional), 2 put positions ($27.6m notional) – listed below, not included above.

The small lines show how much was held over the last 4 quarters (adjusted for stock splits).

#	Security	Ticker	Shares	Value	% of portfolio	Change	Shares change
1	ELECTRONIC ARTS INC COM EA	EA	528,441	$108.4m55.33%	55.33%	Added +81.5k	+81,493 18.2%
2	WARNER BROS DISCOVERY INC COM SER A WBD	WBD	807,012	$21.5m10.99%	10.99%	Reduced -492.9k	-492,903 -37.9%
3	APOGEE THERAPEUTICS INC COM COM		120,000	$15.9m8.13%	8.13%	New
4	ROKU INC COM CL A ROKU	ROKU	105,660	$14.6m7.45%	7.45%	New
5	KENVUE INC COM KVUE	KVUE	754,977	$14.4m7.37%	7.37%	Added +274.5k	+274,460 57.1%
6	TOPBUILD CORP COM BLD	BLD	39,948	$14.2m7.23%	7.23%	New
7	PARAMOUNT SKYDANCE CORP COM CL B SKYD	SKYD	334,724	$3.3m1.69%	1.69%	New
8	ORGANON & CO COMMON STOCK OGN	OGN	175,100	$2.4m1.21%	1.21%	New
9	TIC SOLUTIONS INC COM TIC	TIC	77,339	$625.7k0.32%	0.32%	Unchanged
10	ATRIUM THERAPEUTICS INC COM RNA	RNA	26,517	$356.7k0.18%	0.18%	Reduced -23.4k	-23,396 -46.9%
11	NORFOLK SOUTHN CORP COM NSC	NSC	652	$205.1k0.10%	0.10%	New

Security	Ticker	Shares held before	Value then
CLEARWATER ANALYTICS HLDGS I		1,164,090	$27.5m1.2m shares
HOLOGIC INC HOLX	HOLX	179,036	$13.5m179.0k shares
ARCELLX INC ACLX	ACLX	53,982	$6.2m54.0k shares
TERNS PHARMACEUTICALS INC		115,958	$6.1m116.0k shares
APELLIS PHARMACEUTICALS INC APLS	APLS	127,440	$5.1m127.4k shares
REVOLUTION MEDICINES INC RVMD	RVMD	38,593	$3.8m38.6k shares
ONESTREAM INC OS	OS	60,372	$1.4m60.4k shares
TAKE-TWO INTERACTIVE SOFTWAR TTWO	TTWO	6,500	$1.3m6.5k shares
DAY ONE BIOPHARMACEUTICALS I		31,626	$678.1k31.6k shares
MANCHESTER UTD PLC NEW MANU	MANU	14,920	$251.0k14.9k shares
SURGERY PARTNERS INC SGRY	SGRY	10,025	$119.5k10.0k shares

Underlying	Ticker	Type	Shares controlled	Notional	Change
WARNER BROS DISCOVERY INC WBD · Put	WBD	Put	759,600	$20.3m759.6k shares	New
ELECTRONIC ARTS INC EA · Put	EA	Put	35,900	$7.4m35.9k shares	New