O'Connor Alternative Investments LLC — 13F Holdings & Portfolio
CIK 2081629 · latest 13F-HR filed 2026-08-14
O'Connor Alternative Investments LLC manages $741.3M in 13F-reported U.S. long-equity assets across 6 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are GTLS (56.29%), CWAN (20.45%), COR (9.91%). Quarter over quarter (versus its 2026-06-30 filing) the fund opened 5 new positions, exited 148, added to 0, and trimmed 1.
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.
NEW YORK, NY 10022
$741.3M
Long-equity book
6
Distinct positions
2026-03-31
Filed 2026-08-14
+5 / −148 / ↑0 / ↓1
vs 2026-06-30
| Name | Title / Status | Ownership | Type |
|---|
New Positions
- CLEARWATER$151.6M
- MASIMO COR$73.4M
- ARCELLX IN$51.7M
- COTERRA EN$35.2M
- APELLIS PH$12.1M
Exited Positions
- TOPBUILD C$170.3M
- CLOUDFLARE$48.9M
- SNOWFLAKE$37.2M
- ON SEMICON$30.2M
- AKAMAI TEC$29.8M
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 | CHART INDS | GTLS | 16115Q308 | $417.3M | 56.29% | 2,018,343 | SH |
| 2 | CLEARWATER | CWAN | 185123106 | $151.6M | 20.45% | 6,409,535 | SH |
| 3 | MASIMO COR | COR | 574795100 | $73.4M | 9.91% | 412,903 | SH |
| 4 | ARCELLX IN | ACLX | 03940C100 | $51.7M | 6.98% | 450,504 | SH |
| 5 | COTERRA EN | CTRA | 127097103 | $35.2M | 4.75% | 1,002,337 | SH |
| 6 | APELLIS PH | APLS | 03753U106 | $12.1M | 1.63% | 300,000 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $1.37B | 156 | 0002081629-26-000005 |
| 2026-03-31 | 2026-05-15 | $1.17B | 128 | 0002081629-26-000003 |
| 2026-03-31 | 2026-08-14 | $741.3M | 6 | 0002081629-26-000006 |