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 MRBK 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/MRBK"
Use Arkolith to show who owns MRBK, 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. | $10.6M | 559K | ▲+2.9% Added · +16K sh | Q1 2026 | |
| 2 | VANGUARD GROUP INC | $10.3M | 584K | ▲+0.8% Added · +5K sh | Q4 2025 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $9.2M | 487K | ▲New +487K sh | Q1 2026 | |
| 4 | FIRST MANHATTAN CO. LLC. | $8.3M | 438K | —Held | Q1 2026 | |
| 5 | DIMENSIONAL FUND ADVISORS LP | $8.2M | 434K | ▲+9.8% Added · +39K sh | Q1 2026 | |
| 6 | Ategra Capital Management, LLC | $4.5M | 239K | ▼−32% Reduced · −113K sh | Q1 2026 | |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $4.0M | 213K | ▼~0% Reduced · −55 sh | Q1 2026 | |
| 8 | AMERICAN CENTURY COMPANIES INC | $3.7M | 193K | ▲+42% Added · +57K sh | Q1 2026 | |
| 9 | Nuveen, LLC | $3.2M | 169K | ▲+31% Added · +40K sh | Q1 2026 | |
| 10 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $3.2M | 166K | ▼−7.0% Reduced · −13K sh | Q1 2026 | |
| 11 | Connor, Clark & Lunn Investment Management Ltd. | $2.6M | 138K | ▼−1.0% Reduced · −1K sh | Q1 2026 | |
| 12 | STATE STREET CORP | $2.5M | 132K | ▲+26% Added · +27K sh | Q1 2026 | |
| 13 | TWO SIGMA INVESTMENTS, LP | $2.1M | 111K | ▲+10% Added · +10K sh | Q1 2026 | |
| 14 | Trexquant Investment LP | $1.7M | 89K | ▼−3.3% Reduced · −3K sh | Q1 2026 | |
| 15 | SEGALL BRYANT & HAMILL, LLC | $1.5M | 79K | ▼−37% Reduced · −47K sh | Q1 2026 | |
| 16 | GOLDMAN SACHS GROUP INC | $1.5M | 78K | ▲+23% Added · +15K sh | Q1 2026 | |
| 17 | Russell Investments Group, Ltd. | $1.3M | 67K | ▲+2.2% Added · +1K sh | Q1 2026 | |
| 18 | NORTHERN TRUST CORP | $1.3M | 67K | ▲+2.5% Added · +2K sh | Q1 2026 | |
| 19 | MARSHALL WACE, LLP | $1.3M | 67K | ▼−43% Reduced · −50K sh | Q1 2026 | |
| 20 | MORGAN STANLEY | $1.2M | 65K | ▲+140% Added · +38K sh | Q1 2026 | |
| 21 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.2M | 63K | ▲New +63K sh | Q1 2026 | |
| 22 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $1.2M | 61K | —Held | Q1 2026 | |
| 23 | VANGUARD FIDUCIARY TRUST CO | $1.1M | 60K | ▲New +60K sh | Q1 2026 | |
| 24 | Qube Research & Technologies Ltd | $999K | 53K | ▲New +53K sh | Q1 2026 | |
| 25 | Ancora Advisors LLC | $986K | 52K | ▼−3.3% Reduced · −2K 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 |
|---|---|---|---|---|---|
| Jun 8, 2026 | Annas Christopher J. | Chairman & CEO, Director | Option exercise (M) | 42K | $320K |
| Jun 8, 2026 | Annas Christopher J. | Chairman & CEO, Director | Tax withholding (F) | 17K | $320K |
| Jun 8, 2026 | Annas Christopher J. | Chairman & CEO, Director | Option exercise (M) | 42K | $0 |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 200 | $1K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 200 | $3K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 400 | $4K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 200 | $2K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 200 | $2K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 200 | $3K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 200 | $3K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 400 | $4K |
| Mar 6, 2026 | Collier George C. III | Director | Option exercise (M) | 200 | $1K |
| Company | Co-held by | Combined value |
|---|---|---|
| NVIDIA CORPNVDA | 24 funds | $15.3B |
| MICROSOFT CORPMSFT | 24 funds | $9.8B |
| AMAZON.COM INCAMZN | 24 funds | $8.0B |
| ALPHABET INC-CL AGOOGL | 24 funds | $5.9B |
| ALPHABET INC-CL CGOOG | 24 funds | $5.0B |
| META PLATFORMS INC-CLASS AMETA | 24 funds | $4.5B |
| VISA INC-CLASS A SHARESV | 24 funds | $2.2B |
| ARISTA NETWORKS INCANET | 24 funds | $1.5B |
| RTX CORPRTX | 24 funds | $1.4B |
| BRISTOL-MYERS SQUIBB COBMY | 24 funds | $1.0B |
| APPLE INCAAPL | 23 funds | $11.9B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 23 funds | $2.8B |
Ranked by how many of MRBK'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 MRBK. 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.