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 OPK 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/OPK"
Use Arkolith to show who owns OPK, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Rubric Capital Management LP | $54.5M | 47.8M | —Held | Q1 2026 | |
| 2 | BlackRock, Inc. | $41.3M | 36.2M | ▲+4.0% Added · +1.4M sh | Q1 2026 | |
| 3 | VANGUARD GROUP INC | $40.9M | 32.5M | ▼−14% Reduced · −5.1M sh | Q4 2025 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $16.8M | 14.8M | ▲New +14.8M sh | Q1 2026 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $16.5M | 14.5M | ▲New +14.5M sh | Q1 2026 | |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | $12.9M | 11.3M | ▲+2.2% Added · +240K sh | Q1 2026 | |
| 7 | STATE STREET CORP | $10.8M | 9.5M | ▲+6.1% Added · +550K sh | Q1 2026 | |
| 8 | GOLDMAN SACHS GROUP INC | $8.7M | 7.7M | ▲+28% Added · +1.7M sh | Q1 2026 | |
| 9 | UBS Group AG | $6.9M | 6.1M | ▲+13% Added · +719K sh | Q1 2026 | |
| 10 | NORTHERN TRUST CORP | $4.1M | 3.6M | ▲+5.3% Added · +181K sh | Q1 2026 | |
| 11 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $4.1M | 3.6M | ▼−3.2% Reduced · −119K sh | Q1 2026 | |
| 12 | VANGUARD FIDUCIARY TRUST CO | $3.1M | 2.7M | ▲New +2.7M sh | Q1 2026 | |
| 13 | AWM Investment Company, Inc. | $2.4M | 2.1M | —Held | Q1 2026 | |
| 14 | CITADEL ADVISORS LLC | $2.4M | 2.1M | ▼−27% Reduced · −778K sh | Q1 2026 | |
| 15 | DIMENSIONAL FUND ADVISORS LP | $1.8M | 1.6M | ▼−3.2% Reduced · −51K sh | Q1 2026 | |
| 16 | Y.D. More Investments Ltd | $1.5M | 1.3M | ▼−0.5% Reduced · −7K sh | Q1 2026 | |
| 17 | Bank of New York Mellon Corp | $1.5M | 1.3M | ▼−2.3% Reduced · −30K sh | Q1 2026 | |
| 18 | MORGAN STANLEY | $1.4M | 1.2M | ▲+30% Added · +279K sh | Q1 2026 | |
| 19 | VOYA INVESTMENT MANAGEMENT LLC | $1.3M | 1.2M | ▲+5.3% Added · +59K sh | Q1 2026 | |
| 20 | BANK OF AMERICA CORP /DE/ | $1.3M | 1.1M | ▲+85% Added · +524K sh | Q1 2026 | |
| 21 | JANE STREET GROUP, LLC | $1.3M | 1.1M | ▼−37% Reduced · −661K sh | Q1 2026 | |
| 22 | PFG Investments, LLC | $1.3M | 1.1M | ▼−16% Reduced · −208K sh | Q1 2026 | |
| 23 | OP Asset Management Ltd | $1.3M | 1.1M | ▲New +1.1M sh | Q1 2026 | |
| 24 | Clearstead Advisors, LLC | $1.0M | 884K | ▲+0.2% Added · +2K sh | Q1 2026 | |
| 25 | Nuveen, LLC | $966K | 847K | ▲+0.6% Added · +5K 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 20, 2026 | PAGANELLI JOHN A | Director | Buy (P) | 10K | $11K |
| Mar 18, 2026 | UPPALURI SUBBARAO V | Director | Grant (A) | 50K | $0 |
| Nov 21, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 102K | $133K |
| Nov 21, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 191K | $255K |
| Nov 21, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 89K | $119K |
| Nov 21, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 4K | $5K |
| Nov 21, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 193K | $258K |
| Nov 20, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 162K | $217K |
| Nov 20, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 14K | $18K |
| Nov 20, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 47K | $63K |
| Nov 20, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 119K | $157K |
| Nov 20, 2025 | Frost Gamma Investments Trust | 10% Owner | Buy (P) | 212K | $282K |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 69 funds | $26.7B |
| BROADCOM INCAVGO | 69 funds | $13.9B |
| ELI LILLY & COLLY | 69 funds | $7.2B |
| VISA INC-CLASS A SHARESV | 69 funds | $6.0B |
| COSTCO WHOLESALE CORPCOST | 69 funds | $5.1B |
| MASTERCARD INC - AMA | 69 funds | $4.2B |
| UNITEDHEALTH GROUP INCUNH | 69 funds | $3.1B |
| HONEYWELL INTERNATIONAL INCHON | 69 funds | $2.0B |
| AMAZON.COM INCAMZN | 68 funds | $20.0B |
| ALPHABET INC-CL AGOOGL | 68 funds | $17.5B |
| META PLATFORMS INC-CLASS AMETA | 68 funds | $12.2B |
| JPMORGAN CHASE & COJPM | 68 funds | $8.8B |
Ranked by how many of OPK'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 OPK. 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.