BEACONLIGHT CAPITAL, LLC — 13F Holdings & Portfolio
CIK 1569537 · latest 13F-HR filed 2026-05-14
BEACONLIGHT CAPITAL, LLC manages $189.8M in 13F-reported U.S. long-equity assets across 34 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are CSTM (15.18%), REZI (10.55%), STM (7.00%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 15 new positions, exited 5, added to 5, and trimmed 11.
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.
$189.8M
Long-equity book
34
Distinct positions
2026-03-31
Filed 2026-05-14
+15 / −5 / ↑5 / ↓11
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- CONSTELLIUM SE$3.5M +14.0%
- CHENIERE ENERGY INC$1.5M +21.4%
- NATERA INC$1.4M +25.9%
- TRANSMEDICS GROUP INC$653.0K +18.3%
- JAMES HARDIE INDS PLC$493.9K +20.4%
Top Trims
- SANDISK CORP-$5.7M -75.3%
- QUIDELORTHO CORP-$4.3M -63.4%
- RESIDEO TECHNOLOGIES INC-$4.3M -17.7%
- SOMNIGROUP INTERNATIONAL INC-$4.0M -48.1%
- GDS HLDGS LTD-$3.5M -72.9%
New Positions
- STMICROELECTRONICS N V$13.3M
- CELSIUS HLDGS INC$5.5M
- FEDEX CORP$5.4M
- TANDEM DIABETES CARE INC$4.9M
- SOLSTICE ADVANCED MATLS INC$3.5M
Exited Positions
- CARPENTER TECHNOLOGY CORP$8.0M
- TWILIO INC$6.6M
- SEAGATE TECHNOLOGY HLDNGS PL$3.5M
- FAIR ISAAC CORP$848.7K
- ADVANCE AUTO PARTS INC$429.2K
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 | CONSTELLIUM SE | CSTM | F21107101 | $28.8M | 15.18% | 1,171,812 | SH |
| 2 | RESIDEO TECHNOLOGIES INC | REZI | 76118Y104 | $20.0M | 10.55% | 594,234 | SH |
| 3 | STMICROELECTRONICS N V | STM | 861012102 | $13.3M | 7.00% | 384,477 | SH |
| 4 | STATE STR SPDR S&P 500 ETF T Put | SPY | 78462F103 | $12.5M | 6.58% | 19,200 | SH |
| 5 | SENSIENT TECHNOLOGIES CORP | SXT | 81725T100 | $10.7M | 5.66% | 124,182 | SH |
| 6 | TECK RESOURCES LTD | TECK | 878742204 | $9.5M | 5.00% | 183,299 | SH |
| 7 | CHENIERE ENERGY INC | LNG | 16411R208 | $8.5M | 4.46% | 29,799 | SH |
| 8 | UNITY SOFTWARE INC | U | 91332U101 | $7.6M | 3.99% | 345,309 | SH |
| 9 | GULFPORT ENERGY CORP | GPOR | 402635502 | $7.2M | 3.79% | 33,981 | SH |
| 10 | NATERA INC | NTRA | 632307104 | $6.7M | 3.54% | 33,589 | SH |
| 11 | CELSIUS HLDGS INC | CELH | 15118V207 | $5.5M | 2.92% | 156,391 | SH |
| 12 | FEDEX CORP | FDX | 31428X106 | $5.4M | 2.85% | 15,201 | SH |
| 13 | TANDEM DIABETES CARE INC | TNDM | 875372203 | $4.9M | 2.56% | 253,877 | SH |
| 14 | SOMNIGROUP INTERNATIONAL INC | SGI | 88023U101 | $4.4M | 2.31% | 59,199 | SH |
| 15 | TRANSMEDICS GROUP INC | TMDX | 89377M109 | $4.2M | 2.22% | 42,478 | SH |
| 16 | EQT CORP | EQT | 26884L109 | $4.0M | 2.10% | 62,760 | SH |
| 17 | SOLSTICE ADVANCED MATLS INC | SOLS | 83443Q103 | $3.5M | 1.86% | 46,433 | SH |
| 18 | SERVICENOW INC | NOW | 81762P102 | $3.0M | 1.58% | 28,682 | SH |
| 19 | JAMES HARDIE INDS PLC | JHX | G4253H101 | $2.9M | 1.54% | 153,863 | SH |
| 20 | SNOWFLAKE INC | SNOW | 833445109 | $2.8M | 1.46% | 18,317 | SH |
| 21 | CELANESE CORP DEL | CE | 150870103 | $2.7M | 1.42% | 41,055 | SH |
| 22 | BROADCOM INC | AVGO | 11135F101 | $2.6M | 1.39% | 8,516 | SH |
| 23 | QUIDELORTHO CORP | QDEL | 219798105 | $2.5M | 1.32% | 152,057 | SH |
| 24 | VICOR CORP | VICR | 925815102 | $2.2M | 1.14% | 13,477 | SH |
| 25 | TRANSOCEAN LTD | RIG | H8817H100 | $2.2M | 1.14% | 326,947 | SH |
| 26 | DIGIMARC CORP NEW | DMRC | 25381B101 | $2.1M | 1.12% | 431,772 | SH |
| 27 | SANDISK CORP | SNDK | 80004C200 | $1.9M | 0.98% | 2,942 | SH |
| 28 | CANADIAN PACIFIC KANSAS CITY | CP | 13646K108 | $1.6M | 0.84% | 20,314 | SH |
| 29 | LYONDELLBASELL INDUSTRIES NV | LYB | N53745100 | $1.4M | 0.73% | 17,202 | SH |
| 30 | GDS HLDGS LTD | GDS | 36165L108 | $1.3M | 0.68% | 31,989 | SH |
| 31 | VENTURE GLOBAL INC | VG | 92333F101 | $1.2M | 0.63% | 75,636 | SH |
| 32 | METHANEX CORP | MEOH | 59151K108 | $1.0M | 0.54% | 17,308 | SH |
| 33 | CF INDUSTRIES HOLD | CF | 125269100 | $934.2K | 0.49% | 7,195 | SH |
| 34 | ONTO INNOVATION INC | ONTO | 683344105 | $808.2K | 0.43% | 3,941 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-14 | $189.8M | 34 | 0000919574-26-003095 |
| 2025-12-31 | 2026-02-17 | $171.2M | 23 | 0000919574-26-001169 |
| 2025-09-30 | 2025-11-14 | $202.7M | 28 | 0000919574-25-006888 |