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 MTRN 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/MTRN"
Use Arkolith to show who owns MTRN, 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. | $487.3M | 3.4M | ▲+2.1% Added · +68K sh | Q1 2026 | |
| 2 | VANGUARD GROUP INC | $291.4M | 2.3M | ▼−0.5% Reduced · −12K sh | Q4 2025 | |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | $195.3M | 1.3M | ▲New +1.3M sh | Q1 2026 | |
| 4 | STATE STREET CORP | $192.1M | 1.3M | ▲+9.8% Added · +119K sh | Q1 2026 | |
| 5 | GEODE CAPITAL MANAGEMENT, LLC | $72.9M | 504K | ▲+2.9% Added · +14K sh | Q1 2026 | |
| 6 | SEGALL BRYANT & HAMILL, LLC | $48.4M | 334K | ▼−7.3% Reduced · −26K sh | Q1 2026 | |
| 7 | Copeland Capital Management, LLC | $38.4M | 265K | ▼−13% Reduced · −40K sh | Q1 2026 | |
| 8 | Granahan Investment Management, LLC | $20.9M | 144K | ▲+4.5% Added · +6K sh | Q1 2026 | |
| 9 | VANGUARD FIDUCIARY TRUST CO | $19.7M | 136K | ▲New +136K sh | Q1 2026 | |
| 10 | First Eagle Investment Management, LLC | $14.7M | 102K | ▲+76% Added · +44K sh | Q1 2026 | |
| 11 | Ceredex Value Advisors LLC | $14.1M | 98K | ▲New +98K sh | Q1 2026 | |
| 12 | PANAGORA ASSET MANAGEMENT INC | $12.3M | 85K | ▲+89% Added · +40K sh | Q1 2026 | |
| 13 | PUBLIC SECTOR PENSION INVESTMENT BOARD | $10.7M | 74K | ▲+3.5% Added · +3K sh | Q1 2026 | |
| 14 | GENDELL JEFFREY L | $10.3M | 71K | —Held | Q1 2026 | |
| 15 | Fiera Capital Corp | $8.5M | 59K | ▲+28% Added · +13K sh | Q1 2026 | |
| 16 | HEARTLAND ADVISORS INC | $7.0M | 48K | ▼−4.9% Reduced · −3K sh | Q1 2026 | |
| 17 | CITADEL ADVISORS LLC | $5.5M | 38K | ▲+172% Added · +24K sh | Q1 2026 | |
| 18 | Aptus Capital Advisors, LLC | $5.2M | 36K | ▲New +36K sh | Q1 2026 | |
| 19 | Pathstone Holdings, LLC | $3.6M | 25K | ▲+0.8% Added · +193 sh | Q1 2026 | |
| 20 | SOROS FUND MANAGEMENT LLC | $3.1M | 21K | ▲New +21K sh | Q1 2026 | |
| 21 | INTECH INVESTMENT MANAGEMENT LLC | $3.0M | 21K | ▼−74% Reduced · −60K sh | Q1 2026 | |
| 22 | RICE HALL JAMES & ASSOCIATES, LLC | $2.5M | 17K | ▼−1.8% Reduced · −309 sh | Q1 2026 | |
| 23 | State of New Jersey Common Pension Fund D | $2.2M | 15K | ▲New +15K sh | Q1 2026 | |
| 24 | Advisors Asset Management, Inc. | $2.0M | 14K | ▲+36% Added · +4K sh | Q1 2026 | |
| 25 | FMR LLC | $1.8M | 13K | ▲+152% Added · +8K 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 12, 2026 | PHILLIPPY ROBERT J | Director | Grant (A) | 7 | $0 |
| Jun 12, 2026 | LIGGETT EMILY M | Director | Grant (A) | 1 | $0 |
| Jun 12, 2026 | Fashinpaur Melissa A | Chief Accounting Officer | Grant (A) | 1 | $0 |
| Jun 12, 2026 | KHILNANI VINOD M | Director | Grant (A) | 12 | $0 |
| Jun 12, 2026 | SHULAR CRAIG S | Director | Grant (A) | 31 | $0 |
| Jun 12, 2026 | Prevost Patrick M. | Director | Grant (A) | 9 | $0 |
| Jun 12, 2026 | Chemnitz Gregory R. | VP General Counsel & Secretary | Grant (A) | 2 | $0 |
| Jun 12, 2026 | Chadwick Shelly Marie | Vice President, Finance & CFO | Grant (A) | 8 | $0 |
| Jun 12, 2026 | Vijayvargiya Jugal K. | President and CEO, Director | Grant (A) | 11 | $0 |
| Mar 9, 2026 | Vijayvargiya Jugal K. | President and CEO, Director | Tax withholding (F) | 14 | $2K |
| Mar 9, 2026 | Chemnitz Gregory R. | VP General Counsel & Secretary | Tax withholding (F) | 5 | $721 |
| Mar 9, 2026 | Chadwick Shelly Marie | Vice President, Finance & CFO | Tax withholding (F) | 6 | $865 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 107 funds | $43.3B |
| META PLATFORMS INC-CLASS AMETA | 106 funds | $20.6B |
| APPLE INCAAPL | 105 funds | $49.2B |
| ALPHABET INC-CL AGOOGL | 105 funds | $29.2B |
| AMAZON.COM INCAMZN | 104 funds | $33.6B |
| BROADCOM INCAVGO | 104 funds | $21.5B |
| ALPHABET INC-CL CGOOG | 104 funds | $20.8B |
| NVIDIA CORPNVDA | 103 funds | $59.6B |
| JPMORGAN CHASE & COJPM | 103 funds | $13.9B |
| ELI LILLY & COLLY | 103 funds | $11.1B |
| JOHNSON & JOHNSONJNJ | 102 funds | $9.6B |
| VISA INC-CLASS A SHARESV | 102 funds | $8.5B |
Ranked by how many of MTRN'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 MTRN. 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.