In its 13F for Q1 2024 (holdings as of March 31, 2024, filed May 15, 2024), Twin Securities, Inc. reported 9 stock positions worth $86.1 million . Its top holding was Endeavor Group Hold Class A (EDR) at 31.8% of the portfolio, followed by Pioneer Natural Resources (PXD, 27.3% ) and United States Steel (X, 20.1% ). Compared with Q4 2023, it opened 5 new positions, sold out of 4, added to 3 and reduced 1. The biggest buy was Pioneer Natural Resources (PXD, shares +678% ) and the biggest sale an exit from Karuna Therapeutics (KRTX).
Location New York, NY
CIK 0001351351
Portfolio Value $86.1M (Q1 2024) Holdings 9 stocks · $86.1M Holdings quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock % Of Portfolio ▼ Shares Held Total Value Change vs Q4 2023 EDR Endeavor Group Hold Class A 1,064,858 $27.4M Add +182.8% PXD Pioneer Natural Resources Co. 89,466 $23.5M Add +678.0% X United States Steel Corp. 424,197 $17.3M Add +65.8% SWAV Shockwave Medical Inc. 23,621 $7.7M New CERE Cerevel Therapeutics Holding 101,276 $4.3M Reduce -56.5% JNPR Juniper Networks Inc. 78,337 $2.9M New AXONICS INC 33,414 $2.3M New MANU Manchester United PLC Class A 36,408 $508K New HES Hess Corp. 1,749 $267K New
Options reported separately and not counted above: EDR calls ($8.1M), X puts ($4.2M), KVUE calls ($1.9M), X calls ($73K).
Portfolio Sells Q4 2023 → Q1 2024 Portfolio Sells quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock Change vs Q4 2023 % Of Portfolio Change To Portfolio ▲ KRTX Karuna Therapeutics Inc. Sold out 0.00% −43.18 SPLK Splunk Inc. Sold out 0.00% −9.82 IMGN Immunogen Inc. Sold out 0.00% −7.10 CERE Cerevel Therapeutics Holding Reduce -56.5% 4.97% −5.70 KVUE Kenvue Inc. Sold out 0.00% −3.31
Portfolio Buys Q4 2023 → Q1 2024 Portfolio Buys quarter Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024
Stock Change vs Q4 2023 % Of Portfolio Change To Portfolio ▼ PXD Pioneer Natural Resources Co. Add +678.0% 27.26% +24.47 EDR Endeavor Group Hold Class A Add +182.8% 31.81% +22.15 SWAV Shockwave Medical Inc. New 8.93% +8.93 X United States Steel Corp. Add +65.8% 20.08% +6.62 JNPR Juniper Networks Inc. New 3.37% +3.37 AXONICS INC New 2.68% +2.68 MANU Manchester United PLC Class A New 0.59% +0.59 HES Hess Corp. New 0.31% +0.31
Options Activity Q4 2023 → Q1 2024 Security Type Change vs Q4 2023 Underlying Shares Value ▼ EDR Endeavor Group Hold Class A call New 313,100 $8.1M X United States Steel Corp. put New 102,400 $4.2M KVUE Kenvue Inc. call Reduce -93.3% 5,800 $1.9M KRTX Karuna Therapeutics Inc. call Sold out 1,100 $348Kbefore exit
Calls and puts are listed by the shares they cover; their value is not part of the stock holdings above.
All Filings Quarter Positions 13F Reported Value Top Holdings Q2 2026 11 $195.8M EA, WBD, APGE, ROKU, KVUE Q1 2026 16 $202.3M EA, WBD, CWAN, HOLX, KVUE Q4 2025 16 $261.1M CYBR, EXAS, EA, WBD, RNAM Q3 2025 13 $198.5M VRNA, K, MRUS, COOP, CYBR Q2 2025 11 $113.0M K, HES, BPMC, SGRY, SPR Q1 2025 13 $174.1M ITCI, K, BECN, HES, HEES Q4 2024 13 $169.6M JNPR, K, HCP, SMAR, HES Q3 2024 12 $85.6M JNPR, EDR, HES, SMAR, SRCL Q2 2024 12 $82.9M EDR, CERE, HES, X, HCP Q1 2024 9 $86.1M EDR, PXD, X, SWAV, CERE