Twin Securities, Inc. — 13F Holdings & Portfolio
CIK 1351351 · latest 13F-HR filed 2026-05-15
Twin Securities, Inc. manages $206.1M in 13F-reported U.S. long-equity assets across 17 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are EA (44.21%), WBD (17.32%), CWAN (13.36%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 8 new positions, exited 8, added to 6, and trimmed 2.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$206.1M
Long-equity book
17
Distinct positions
2026-03-31
Filed 2026-05-15
+8 / −8 / ↑6 / ↓2
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- ELECTRONIC ARTS INC$42.1M +85.9%
- CLEARWATER ANALYTICS HLDGS I$26.3M +2214.6%
- HOLOGIC INC$7.2M +115.0%
- WARNER BROS DISCOVERY INC$3.6M +11.1%
- KENVUE INC$1.3M +18.4%
New Positions
- ARCELLX INC$6.2M
- TERNS PHARMACEUTICALS INC$6.1M
- APELLIS PHARMACEUTICALS INC$5.1M
- REVOLUTION MEDICINES INC$3.8M
- ONESTREAM INC$1.4M
Exited Positions
- CYBERARK SOFTWARE LTD$59.4M
- EXACT SCIENCES CORP$49.1M
- AVIDITY BIOSCIENCES INC$26.3M
- CONFLUENT INC$15.3M
- NORFOLK SOUTHN CORP$7.3M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | ELECTRONIC ARTS INC | EA | 285512109 | $91.1M | 44.21% | 446,948 | SH |
| 2 | WARNER BROS DISCOVERY INC | WBD | 934423104 | $35.7M | 17.32% | 1,299,915 | SH |
| 3 | CLEARWATER ANALYTICS HLDGS I | CWAN | 185123106 | $27.5M | 13.36% | 1,164,090 | SH |
| 4 | HOLOGIC INC | HOLX | 436440101 | $13.5M | 6.57% | 179,036 | SH |
| 5 | KENVUE INC | KVUE | 49177J102 | $8.3M | 4.02% | 480,517 | SH |
| 6 | ARCELLX INC | ACLX | 03940C100 | $6.2M | 3.01% | 53,982 | SH |
| 7 | TERNS PHARMACEUTICALS INC | TERN | 880881107 | $6.1M | 2.97% | 115,958 | SH |
| 8 | APELLIS PHARMACEUTICALS INC | APLS | 03753U106 | $5.1M | 2.49% | 127,440 | SH |
| 9 | REVOLUTION MEDICINES INC Put | RVMD | 76155X100 | $3.8M | 1.84% | 39,000 | SH |
| 10 | REVOLUTION MEDICINES INC | RVMD | 76155X100 | $3.8M | 1.82% | 38,593 | SH |
| 11 | ONESTREAM INC | OS | 68278B107 | $1.4M | 0.70% | 60,372 | SH |
| 12 | TAKE-TWO INTERACTIVE SOFTWAR | TTWO | 874054109 | $1.3M | 0.62% | 6,500 | SH |
| 13 | DAY ONE BIOPHARMACEUTICALS I | DAWN | 23954D109 | $678.1K | 0.33% | 31,626 | SH |
| 14 | ATRIUM THERAPEUTICS INC | RNA | 04965N104 | $667.3K | 0.32% | 49,913 | SH |
| 15 | TIC SOLUTIONS INC | TIC | 00510N102 | $508.9K | 0.25% | 77,339 | SH |
| 16 | MANCHESTER UTD PLC NEW | MANU | G5784H106 | $251.0K | 0.12% | 14,920 | SH |
| 17 | SURGERY PARTNERS INC | SGRY | 86881A100 | $119.5K | 0.06% | 10,025 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-15 | $206.1M | 17 | 0001172661-26-002293 |
| 2025-12-31 | 2026-02-17 | $261.7M | 17 | 0001172661-26-000903 |
| 2025-09-30 | 2025-11-14 | $201.2M | 15 | 0001172661-25-005055 |