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 OSUR 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/OSUR"
Use Arkolith to show who owns OSUR, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $19.5M | 6.5M | ▲+1.1% Added · +69K sh | Q1 2026 | |
| 2 | PRIVATE MANAGEMENT GROUP INC | $16.3M | 5.4M | ▲+0.5% Added · +26K sh | Q1 2026 | |
| 3 | Neuberger Berman Group LLC | $13.1M | 4.4M | ▲+9.5% Added · +377K sh | Q1 2026 | |
| 4 | VANGUARD GROUP INC | $9.9M | 4.1M | ▼−0.8% Reduced · −32K sh | Q4 2025 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $9.1M | 3.0M | ▲New +3.0M sh | Q1 2026 | |
| 6 | DIMENSIONAL FUND ADVISORS LP | $8.5M | 2.8M | ▼−13% Reduced · −438K sh | Q1 2026 | |
| 7 | SYSTEMATIC FINANCIAL MANAGEMENT LP | $7.4M | 2.5M | ▲+0.1% Added · +3K sh | Q1 2026 | |
| 8 | RENAISSANCE TECHNOLOGIES LLC | $6.2M | 2.1M | ▼−2.9% Reduced · −62K sh | Q1 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $5.5M | 1.8M | ▲+3.9% Added · +69K sh | Q1 2026 | |
| 10 | STATE STREET CORP | $5.1M | 1.7M | ▲+6.2% Added · +100K sh | Q1 2026 | |
| 11 | D. E. Shaw & Co., Inc. | $4.1M | 1.4M | ▼−17% Reduced · −283K sh | Q1 2026 | |
| 12 | JACOBS LEVY EQUITY MANAGEMENT, INC | $3.0M | 1000K | ▲+1.1% Added · +11K sh | Q1 2026 | |
| 13 | WELLS FARGO & COMPANY/MN | $2.7M | 900K | ▲+2.6% Added · +23K sh | Q1 2026 | |
| 14 | Archon Capital Management LLC | $2.2M | 748K | ▲+30% Added · +174K sh | Q1 2026 | |
| 15 | NORTHERN TRUST CORP | $1.8M | 595K | ▲+3.4% Added · +20K sh | Q1 2026 | |
| 16 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.8M | 590K | ▲New +590K sh | Q1 2026 | |
| 17 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1.8M | 586K | ▼−5.8% Reduced · −36K sh | Q1 2026 | |
| 18 | VANGUARD FIDUCIARY TRUST CO | $1.4M | 455K | ▲New +455K sh | Q1 2026 | |
| 19 | SEI INVESTMENTS CO | $1.3M | 418K | ▲+127% Added · +234K sh | Q1 2026 | |
| 20 | GOLDMAN SACHS GROUP INC | $1.2M | 412K | ▲+30% Added · +94K sh | Q1 2026 | |
| 21 | MORGAN STANLEY | $1.1M | 374K | ▼−29% Reduced · −155K sh | Q1 2026 | |
| 22 | KLP KAPITALFORVALTNING AS | $1.1M | 363K | —Held | Q1 2026 | |
| 23 | JPMORGAN CHASE & CO | $1.1M | 361K | ▼−9.2% Reduced · −37K sh | Q1 2026 | |
| 24 | Intrinsic Edge Capital Management LLC | $1.0M | 349K | —Held | Q1 2026 | |
| 25 | AQR CAPITAL MANAGEMENT LLC | $993K | 331K | ▲+49% Added · +109K 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 26, 2026 | Boyd Steven Kyle | Director | Tax withholding (F) | 1K | $4K |
| Mar 26, 2026 | Boyd Steven Kyle | Director | Grant (A) | 5K | $16K |
| Mar 20, 2026 | McGrath Kenneth J | Chief Financial Officer | Buy (P) | 32K | $95K |
| Mar 20, 2026 | EGLINTON MANNER CARRIE | President & CEO, Director | Buy (P) | 32K | $95K |
| Mar 13, 2026 | EGLINTON MANNER CARRIE | President & CEO, Director | Buy (P) | 22K | $66K |
| Mar 13, 2026 | McGrath Kenneth J | Chief Financial Officer | Buy (P) | 22K | $66K |
| Mar 2, 2026 | Anthony Michele Marie | SVP Finance & CAO | Grant (A) | 43K | $0 |
| Mar 2, 2026 | EGLINTON MANNER CARRIE | President & CEO, Director | Grant (A) | 355K | $0 |
| Mar 2, 2026 | McGrath Kenneth J | Chief Financial Officer | Grant (A) | 88K | $0 |
| Mar 1, 2026 | Anthony Michele Marie | SVP Finance & CAO | Tax withholding (F) | 4K | $12K |
| Mar 1, 2026 | Anthony Michele Marie | SVP Finance & CAO | Grant (A) | 14K | $0 |
| Mar 1, 2026 | Anthony Michele Marie | SVP Finance & CAO | Tax withholding (F) | 11K | $33K |
| Company | Co-held by | Combined value |
|---|---|---|
| APPLE INCAAPL | 38 funds | $20.9B |
| MICROSOFT CORPMSFT | 38 funds | $17.6B |
| JPMORGAN CHASE & COJPM | 38 funds | $5.8B |
| AMAZON.COM INCAMZN | 37 funds | $12.8B |
| ALPHABET INC-CL CGOOG | 37 funds | $8.3B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 37 funds | $4.7B |
| ELI LILLY & COLLY | 37 funds | $4.5B |
| COSTCO WHOLESALE CORPCOST | 37 funds | $3.3B |
| LAM RESEARCH CORPLRCX | 37 funds | $3.0B |
| NETFLIX INCNFLX | 37 funds | $2.3B |
| BANK OF AMERICA CORPBAC | 37 funds | $1.5B |
| NVIDIA CORPNVDA | 36 funds | $21.8B |
Ranked by how many of OSUR'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 OSUR. 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.