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 OPY 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/OPY"
Use Arkolith to show who owns OPY, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | DIMENSIONAL FUND ADVISORS LP | $44.3M | 497K | ▲+1.5% Added · +7K sh | Q1 2026 | |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | $34.9M | 391K | ▲New +391K sh | Q1 2026 | |
| 3 | VANGUARD GROUP INC | $31.7M | 438K | ▲+2.8% Added · +12K sh | Q4 2025 | |
| 4 | AMERICAN CENTURY COMPANIES INC | $31.5M | 353K | ▲+10% Added · +33K sh | Q1 2026 | |
| 5 | BlackRock, Inc. | $16.7M | 187K | ▲+6.2% Added · +11K sh | Q1 2026 | |
| 6 | Boston Partners | $11.7M | 131K | ▲+52% Added · +45K sh | Q1 2026 | |
| 7 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $9.0M | 101K | ▼−9.1% Reduced · −10K sh | Q1 2026 | |
| 8 | MORGAN STANLEY | $7.9M | 88K | ▲+3.9% Added · +3K sh | Q1 2026 | |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $7.7M | 87K | ▲+18% Added · +13K sh | Q1 2026 | |
| 10 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $6.5M | 73K | ▲+26% Added · +15K sh | Q1 2026 | |
| 11 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $6.4M | 72K | ▲+9.0% Added · +6K sh | Q1 2026 | |
| 12 | MILLENNIUM MANAGEMENT LLC | $6.0M | 67K | ▼−41% Reduced · −47K sh | Q1 2026 | |
| 13 | STATE STREET CORP | $5.3M | 60K | ▼−11% Reduced · −8K sh | Q1 2026 | |
| 14 | JPMORGAN CHASE & CO | $4.7M | 54K | ▲+6.0% Added · +3K sh | Q1 2026 | |
| 15 | Empowered Funds, LLC | $4.1M | 46K | ▲New +46K sh | Q1 2026 | |
| 16 | TWO SIGMA INVESTMENTS, LP | $3.6M | 41K | ▲+71% Added · +17K sh | Q1 2026 | |
| 17 | VANGUARD FIDUCIARY TRUST CO | $3.6M | 40K | ▲New +40K sh | Q1 2026 | |
| 18 | D. E. Shaw & Co., Inc. | $3.4M | 38K | ▼−24% Reduced · −12K sh | Q1 2026 | |
| 19 | GOLDMAN SACHS GROUP INC | $3.3M | 37K | ▼−19% Reduced · −9K sh | Q1 2026 | |
| 20 | VANGUARD PORTFOLIO MANAGEMENT LLC | $3.0M | 33K | ▲New +33K sh | Q1 2026 | |
| 21 | BOOTHBAY FUND MANAGEMENT, LLC | $2.9M | 32K | ▼−0.1% Reduced · −21 sh | Q1 2026 | |
| 22 | Man Group plc | $2.8M | 32K | ▲+64% Added · +12K sh | Q1 2026 | |
| 23 | Neuberger Berman Group LLC | $2.6M | 30K | ▼−2.4% Reduced · −725 sh | Q1 2026 | |
| 24 | Qube Research & Technologies Ltd | $2.5M | 28K | ▲+32% Added · +7K sh | Q1 2026 | |
| 25 | POLEN CAPITAL MANAGEMENT LLC | $2.4M | 27K | ▲+65% Added · +11K 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 2, 2026 | McNAMARA DENNIS P | Secretary | Sell (S) | 5K | $424K |
| Feb 26, 2026 | BEHRENS EVAN | Director | Other (J) | 1K | — |
| Feb 26, 2026 | Spaulding Suzanne | Director | Other (J) | 1K | — |
| Feb 26, 2026 | Glasser Teresa | Director | Other (J) | 1K | — |
| Feb 26, 2026 | ROTH R LAWRENCE | Director | Other (J) | 1K | — |
| Feb 26, 2026 | Friedman Paul M | Director | Other (J) | 1K | — |
| Feb 26, 2026 | Dwyer Timothy Martin | Director | Other (J) | 1K | — |
| Feb 26, 2026 | Kanter Stacy J. | Director | Other (J) | 1K | — |
| Jan 28, 2026 | LOWENTHAL ALBERT G | CEO, Director, 10% Owner | Other (J) | 110K | — |
| Jan 28, 2026 | McNAMARA DENNIS P | Secretary | Other (J) | 3K | — |
| Jan 28, 2026 | McNAMARA DENNIS P | Secretary | Other (J) | 5K | — |
| Jan 28, 2026 | LOWENTHAL ALBERT G | CEO, Director, 10% Owner | Other (J) | 56K | — |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 31 funds | $9.3B |
| AMAZON.COM INCAMZN | 31 funds | $8.4B |
| BROADCOM INCAVGO | 31 funds | $5.5B |
| ELI LILLY & COLLY | 31 funds | $3.2B |
| UNITEDHEALTH GROUP INCUNH | 31 funds | $1.4B |
| AUTOMATIC DATA PROCESSINGADP | 31 funds | $457.3M |
| NVIDIA CORPNVDA | 30 funds | $13.6B |
| APPLE INCAAPL | 30 funds | $8.9B |
| ALPHABET INC-CL AGOOGL | 30 funds | $5.4B |
| META PLATFORMS INC-CLASS AMETA | 30 funds | $4.5B |
| ALPHABET INC-CL CGOOG | 30 funds | $4.2B |
| MASTERCARD INC - AMA | 30 funds | $2.8B |
Ranked by how many of OPY'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 OPY. 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.