O'Connor Alternative Investments LLC holds a concentrated book of 121 stocks worth $1.2B as of Q1 2026 (disclosed May 15, 2026, a ~45-day 13F lag). Their largest long position is Hologic Inc at 20% of the equity book. They also disclosed $790K in put options (a bearish bet) and $393K in call options (bullish), shown separately below and excluded from the equity book.
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Top-heavy: concentrated book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
27% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Hologic In COM | $235.7M | 3.12M | 20.2% | ▲New New position | |
| 2 | Air Lease CLA | $185.7M | 2.86M | 15.9% | ▲New New position | |
| 3 | Amicus The COM | $122.1M | 8.44M | 10.5% | ▲New New position | |
| 4 | Sealed Air COM | $93.1M | 2.21M | 8.0% | ▲New New position | |
| 5 | Onestream CLA | $76.5M | 3.19M | 6.6% | ▲New New position | |
| 6 | Day One Bi COM | $40.0M | 1.87M | 3.4% | ▲New New position | |
| 7 | Snowflake NOTE1 | $30.8M | 25.00M | 2.6% | ▲New New position | |
| 8 | Duke Energ NOTE4 | $27.7M | 25.00M | 2.4% | ▲New New position | |
| 9 | Carnival P ADS | $25.3M | 982.6K | 2.2% | ▲New New position | |
| 10 | Cloudflare NOTE8 | $25.2M | 21.50M | 2.2% | ▲New New position | |
| 11 | Live Natio NOTE3 | $22.9M | 15.00M | 2.0% | ▲New New position | |
| 12 | On Semicon NOTE0 | $19.7M | 20.00M | 1.7% | ▲New New position | |
| 13 | Akamai Tec NOTE1 | $17.2M | 15.00M | 1.5% | ▲New New position | |
| 14 | Klarna Gro SHS | $14.8M | 1.13M | 1.3% | ▲New New position | |
| 15 | Alphabet I CAPST | $14.4M | 50.3K | 1.2% | ▲New New position | |
| 16 | Vaneck ETF SEMIC | $10.5M | 27.5K | 0.9% | ▲New New position | |
| 17 | Atrium The COM | $7.7M | 578.0K | 0.7% | ▲New New position | |
| 18 | Fox Corp CLBCO | $7.3M | 137.8K | 0.6% | ▲New New position | |
| 19 | Jena Acqui USDCL | $7.2M | 700.0K | 0.6% | ▲New New position | |
| 20 | Egh Acquis SHSCL | $5.1M | 500.0K | 0.4% | ▲New New position | |
| 21 | Kensington UNIT9 | $5.0M | 500.0K | 0.4% | ▲New New position | |
| 22 | Oneim Acqu ORDSH | $5.0M | 500.0K | 0.4% | ▲New New position | |
| 23 | Gores Hldg SHSCL | $4.9M | 474.9K | 0.4% | ▲New New position | |
| 24 | Cantor Equ SHSCL | $4.5M | 450.0K | 0.4% | ▲New New position | |
| 25 | Zillow Gro CLCCA | $4.5M | 107.9K | 0.4% | ▲New New position | |
| 26 | Agricultur SHSCL | $4.3M | 384.2K | 0.4% | ▲New New position | |
| 27 | Trailblaze ORDSH | $4.0M | 400.0K | 0.3% | ▲New New position | |
| 28 | TRG Latin UNIT0 | $3.5M | 350.0K | 0.3% | ▲New New position | |
| 29 | Live Oak A CLASH | $3.4M | 324.9K | 0.3% | ▲New New position | |
| 30 | Newhold In ORDSH | $3.4M | 324.6K | 0.3% | ▲New New position | |
| 31 | Western Di COM | $3.2M | 12.0K | 0.3% | ▲New New position | |
| 32 | Oaktree Ac SHSCL | $3.2M | 300.0K | 0.3% | ▲New New position | |
| 33 | Armada Acq UNIT0 | $3.0M | 300.0K | 0.3% | ▲New New position | |
| 34 | Clearway E CLA | $2.9M | 75.0K | 0.3% | ▲New New position | |
| 35 | Norwegian SHS | $2.7M | 145.2K | 0.2% | ▲New New position | |
| 36 | GP-Act III CLA | $2.7M | 250.0K | 0.2% | ▲New New position | |
| 37 | Accel Ente COMCL | $2.7M | 246.7K | 0.2% | ▲New New position | |
| 38 | Stellar V SHSCL | $2.6M | 250.0K | 0.2% | ▲New New position | |
| 39 | Dune Acqui SHSCL | $2.6M | 250.0K | 0.2% | ▲New New position | |
| 40 | Blue WTR A ORDSH | $2.6M | 250.0K | 0.2% | ▲New New position | |
| 41 | New Provid USDCL | $2.6M | 250.0K | 0.2% | ▲New New position | |
| 42 | Cartesian COMCL | $2.6M | 250.0K | 0.2% | ▲New New position | |
| 43 | Thayer Ven CLA | $2.6M | 250.0K | 0.2% | ▲New New position | |
| 44 | Talon Cap ORDSH | $2.5M | 250.0K | 0.2% | ▲New New position | |
| 45 | Solarius C SHSCL | $2.5M | 250.0K | 0.2% | ▲New New position | |
| 46 | Pioneer Ac CLAOR | $2.5M | 250.0K | 0.2% | ▲New New position | |
| 47 | Oxley Brid USDCL | $2.5M | 250.0K | 0.2% | ▲New New position | |
| 48 | M3-Brigade ORDSH | $2.5M | 250.0K | 0.2% | ▲New New position | |
| 49 | Highview M ORDSH | $2.5M | 250.0K | 0.2% | ▲New New position | |
| 50 | CSLM Digit USDCL | $2.5M | 250.0K | 0.2% | ▲New New position |
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | AMERICAN AIRLINES GROUP INCAAL | $461K | 2.1M |
| PUT · bearish | SS SPDR S&P 500 ETF TRUST-USSPY | $257K | 115K |
| CALL · bullish | BLOOM ENERGY CORP- ABE | $245K | 15K |
| CALL · bullish | SNOWFLAKE INCSNOW | $122K | 20K |
| PUT · bearish | LUCID GROUP INCLCID | $70K | 13K |
| CALL · bullish | PALO ALTO NETWORKS INCPANW | $26K | 10K |
| PUT · bearish | INVESCO QQQ TRUST SERIES 1QQQ | $2K | 26K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 15, 2026 | 128 | $1.2B | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.