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Disclosery

Twin Securities, Inc.

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13F filer, CIK 1351351, New York, NY

Twin Securities, Inc. reported $206,104,895 across 17 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-15. Its ten largest share positions make up 98.27% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001172661-26-002293

Period
2026-03-31
Reported value
$206M
Holdings
17
Top 10 weight
98.27%
New
9
Sold out
9

Largest buys vs the previous quarter

SecurityShares changeApprox. value
EAadded+207,112$42.2M
CWANadded+1,114,776$26.4M
HOLXadded+94,523$7.14M
ACLXnew+53,982$6.2M
TERNnew+115,958$6.11M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
CYBERARK SOFTWARE LTD/ISRAELexited-133,145-$59.4M
EXASexited-483,589-$49.1M
RNAMexited-365,144-$26.3M
CFLTexited-505,486-$15.3M
NSCexited-25,200-$7.28M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2026

Share positions as resolved from 13F-HR 0001172661-26-002293, largest first. % of portfolio is the value over $202,312,145, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
EAELECTRONIC ARTS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 239,836 shares; 2026Q1: 446,948 shares 446,948$91.1M45.04%+207,112Timeline
WBDWARNER BROS DISCOVERY INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: 127,717 shares; 2025Q4: 1,114,989 shares; 2026Q1: 1,299,915 shares 1,299,915$35.7M17.64%+184,926Timeline
CWANCLEARWATER ANALYTICS HLDGS IQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 49,314 shares; 2026Q1: 1,164,090 shares 1,164,090$27.5M13.61%+1,114,776Timeline
HOLXHOLOGIC INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 84,513 shares; 2026Q1: 179,036 shares 179,036$13.5M6.69%+94,523Timeline
KVUEKENVUE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 405,583 shares; 2026Q1: 480,517 shares 480,517$8.28M4.09%+74,934Timeline
ACLXARCELLX INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 53,982 shares 53,982$6.2M3.06%newTimeline
TERNTERNS PHARMACEUTICALS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 115,958 shares 115,958$6.11M3.02%newTimeline
APLSAPELLIS PHARMACEUTICALS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 127,440 shares 127,440$5.13M2.53%newTimeline
RVMDREVOLUTION MEDICINES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 38,593 shares 38,593$3.75M1.86%newTimeline
OSONESTREAM INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 60,372 shares 60,372$1.45M0.72%newTimeline
TTWOTAKE-TWO INTERACTIVE SOFTWARQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 6,500 shares 6,500$1.28M0.63%newTimeline
DAWNDAY ONE BIOPHARMACEUTICALS IQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 31,626 shares 31,626$678K0.34%newTimeline
RNAATRIUM THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: not reported; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: not reported; 2026Q1: 49,913 shares 49,913$667K0.33%newTimeline
TICTIC SOLUTIONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 405,768 shares; 2025Q2: 434,568 shares; 2025Q3: 123,056 shares; 2025Q4: 77,339 shares; 2026Q1: 77,339 shares 77,339$509K0.25%0Timeline
MANUMANCHESTER UTD PLC NEWQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 36,266 shares; 2024Q4: 36,543 shares; 2025Q1: 37,143 shares; 2025Q2: 12,143 shares; 2025Q3: 14,763 shares; 2025Q4: 14,570 shares; 2026Q1: 14,920 shares 14,920$251K0.12%+350Timeline
SGRYSURGERY PARTNERS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 330,273 shares; 2025Q2: 511,716 shares; 2025Q3: 142,872 shares; 2025Q4: 170,258 shares; 2026Q1: 10,025 shares 10,025$119K0.06%-160,233Timeline

Options

Puts and calls, as filed. The amount and value describe the underlying shares, not the option premium, so they stay out of % of portfolio (H5).

SecurityTypeAmountValueChange
RVMDREVOLUTION MEDICINES INC Stockput39,000$3.79Mnew

Sold out in Q1 2026

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
CYBERARK SOFTWARE LTD/ISRAELCYBERARK SOFTWARE LTD/ISRAEL133,145$59.4Mshares
EXASEXACT SCIENCES CORP483,589$49.1Mshares
RNAMAVIDITY BIOSCIENCES INC365,144$26.3Mshares
CFLTCONFLUENT INC-CLASS A505,486$15.3Mshares
NSCNORFOLK SOUTHN CORP25,200$7.28Mshares
DAYDAYFORCE INC39,241$2.71Mshares
CDTXCIDARA THERAPEUTICS INC4,900$1.08Mshares
MLYSMINERALYS THERAPEUTICS INC16,737$607Kshares
WBDWARNER BROS DISCOVERY INC20,100$579Kcall

How Q1 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001172661-26-002293 base2026-05-15acceptance time not in the bulk data set