The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This stock page is the Follow view. The Build view lets your agent query OBIO owners, fund changes, insider filings, and source links through REST or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/OBIO"
Use Arkolith to show who owns OBIO, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | RTW INVESTMENTS, LP | $35.3M | 8.3M | —Held | Q1 2026 | |
| 2 | PERCEPTIVE ADVISORS LLC | $21.4M | 5.0M | ▼−1.7% Reduced · −89K sh | Q1 2026 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $9.4M | 2.2M | ▲New +2.2M sh | Q1 2026 | |
| 4 | VANGUARD GROUP INC | $6.7M | 1.6M | ▲+8.3% Added · +123K sh | Q4 2025 | |
| 5 | Alyeska Investment Group, L.P. | $4.3M | 1.0M | —Held | Q1 2026 | |
| 6 | MILLENNIUM MANAGEMENT LLC | $3.0M | 703K | ▲+189% Added · +459K sh | Q1 2026 | |
| 7 | BlackRock, Inc. | $2.7M | 636K | ▲+0.8% Added · +5K sh | Q1 2026 | |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | $2.1M | 485K | ▲+2.6% Added · +12K sh | Q1 2026 | |
| 9 | Affinity Asset Advisors, LLC | $1.7M | 403K | ▼−30% Reduced · −170K sh | Q1 2026 | |
| 10 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1.1M | 265K | ▲+0.6% Added · +2K sh | Q1 2026 | |
| 11 | VANGUARD FIDUCIARY TRUST CO | $1000K | 235K | ▲New +235K sh | Q1 2026 | |
| 12 | Simplify Asset Management Inc. | $932K | 219K | ▲New +219K sh | Q1 2026 | |
| 13 | MARSHALL WACE, LLP | $801K | 188K | ▲+9.8% Added · +17K sh | Q1 2026 | |
| 14 | 683 Capital Management, LLC | $786K | 185K | ▼−9.3% Reduced · −19K sh | Q1 2026 | |
| 15 | STATE STREET CORP | $720K | 169K | ▲+6.5% Added · +10K sh | Q1 2026 | |
| 16 | GOLDMAN SACHS GROUP INC | $660K | 155K | ▲+16% Added · +21K sh | Q1 2026 | |
| 17 | NORTHERN TRUST CORP | $503K | 118K | ▲+6.7% Added · +7K sh | Q1 2026 | |
| 18 | Qube Research & Technologies Ltd | $463K | 109K | ▲+2.1% Added · +2K sh | Q1 2026 | |
| 19 | IFP Advisors, Inc | $420K | 99K | ▲+14% Added · +12K sh | Q1 2026 | |
| 20 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $414K | 98K | ▼−37% Reduced · −58K sh | Q1 2026 | |
| 21 | Point72 Asset Management, L.P. | $374K | 88K | ▼−46% Reduced · −74K sh | Q1 2026 | |
| 22 | CITADEL ADVISORS LLC | $337K | 79K | ▲+162% Added · +49K sh | Q1 2026 | |
| 23 | Hudson Bay Capital Management LP | $302K | 71K | ▲+44% Added · +22K sh | Q1 2026 | |
| 24 | RENAISSANCE TECHNOLOGIES LLC | $301K | 71K | ▼−53% Reduced · −80K sh | Q1 2026 | |
| 25 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $300K | 71K | ▲+182% Added · +46K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Mar 25, 2026 | Aiello Joshua | Principal Accounting Officer | Tax withholding (F) | 241 | $1K |
| Mar 25, 2026 | Sherman Darren | See Remarks, Director | Tax withholding (F) | 33K | $152K |
| Mar 25, 2026 | Hochman David P | See Remarks, Director | Tax withholding (F) | 32K | $148K |
| Mar 13, 2026 | Hochman David P | See Remarks, Director | Buy (P) | 10K | $43K |
| Feb 12, 2026 | Aiello Joshua | Principal Accounting Officer | Grant (A) | 70K | $0 |
| Feb 12, 2026 | Hochman David P | See Remarks, Director | Grant (A) | 504K | $0 |
| Feb 12, 2026 | Taylor Andrew Lawrence | Chief Financial Officer | Grant (A) | 181K | $0 |
| Feb 12, 2026 | Sherman Darren | See Remarks, Director | Grant (A) | 397K | $0 |
| Feb 5, 2026 | Cleary Chris | Director | Tax withholding (F) | 676 | $3K |
| Jan 28, 2026 | Sherman Darren | See Remarks, Director | Grant (A) | 35K | $0 |
| Jan 2, 2026 | Sherman Darren | See Remarks, Director | Tax withholding (F) | 6K | $24K |
| Jan 2, 2026 | Aiello Joshua | Principal Accounting Officer | Tax withholding (F) | 241 | $1K |
| Company | Co-held by | Combined value |
|---|---|---|
| ELI LILLY & COLLY | 16 funds | $723.1M |
| INTUITIVE SURGICAL INCISRG | 15 funds | $1.4B |
| MERCK & CO. INC.MRK | 15 funds | $989.8M |
| UNITEDHEALTH GROUP INCUNH | 15 funds | $880.9M |
| NVIDIA CORPNVDA | 14 funds | $8.3B |
| AMAZON.COM INCAMZN | 14 funds | $5.4B |
| MICROSOFT CORPMSFT | 14 funds | $2.9B |
| ALPHABET INC-CL AGOOGL | 14 funds | $2.3B |
| HOME DEPOT INCHD | 14 funds | $1.3B |
| JOHNSON & JOHNSONJNJ | 14 funds | $1.1B |
| CHEVRON CORPCVX | 14 funds | $1.0B |
| COCA-COLA CO/THEKO | 14 funds | $841.7M |
Ranked by how many of OBIO's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for OBIO. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes. Every panel above is one call to the Arkolith API & MCP server.