288 tracked 13F filers disclose a position in MTRN as of the latest SEC 13F filings, a combined $2.7B in reported value. 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.
| # | 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 PORTFOLIO MANAGEMENT LLC | $195.3M | 1.3M | →First observed position No prior filed position | Q1 2026 | |
| 3 | STATE STREET CORP | $192.1M | 1.3M | ▲+9.8% Added · +119K sh | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $134.2M | 928K | →First observed position No prior filed position | Q1 2026 | |
| 5 | DIMENSIONAL FUND ADVISORS LP | $128.0M | 885K | ▼−11% Reduced · −106K sh | Q1 2026 | |
| 6 | AMERICAN CENTURY COMPANIES INC | $127.7M | 883K | ▲+69% Added · +361K sh | Q1 2026 | |
| 7 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | $76.6M | 530K | ▼−6.0% Reduced · −34K sh | Q1 2026 | |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | $72.9M | 504K | ▲+2.9% Added · +14K sh | Q1 2026 | |
| 9 | ACK Asset Management LLC | $68.7M | 475K | —Held | Q1 2026 | |
| 10 | Fisher Asset Management, LLC | $63.9M | 442K | ▲+215% Added · +302K sh | Q1 2026 | |
| 11 | MORGAN STANLEY | $61.4M | 424K | ▼−1.2% Reduced · −5K sh | Q1 2026 | |
| 12 | SEGALL BRYANT & HAMILL, LLC | $48.4M | 334K | ▼−7.3% Reduced · −26K sh | Q1 2026 | |
| 13 | Harvey Partners, LLC | $42.4M | 293K | ▼−8.3% Reduced · −26K sh | Q1 2026 | |
| 14 | RAYMOND JAMES FINANCIAL INC | $40.6M | 293K | ▲+1.6% Added · +5K sh | Q1 2026 | |
| 15 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $42.3M | 293K | ▼−3.7% Reduced · −11K sh | Q1 2026 | |
| 16 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $37.7M | 261K | ▼−11% Reduced · −33K sh | Q1 2026 | |
| 17 | NORTHERN TRUST CORP | $35.8M | 248K | ▼−0.6% Reduced · −2K sh | Q1 2026 | |
| 18 | Copeland Capital Management, LLC | $67.7M | 228K | ▼−14% Reduced · −38K sh | Q2 2026 | |
| 19 | ROYAL BANK OF CANADA | $31.7M | 219K | ▼−15% Reduced · −38K sh | Q1 2026 | |
| 20 | GAMCO INVESTORS, INC. ET AL | $27.7M | 191K | ▼−2.4% Reduced · −5K sh | Q1 2026 | |
| 21 | JPMORGAN CHASE & CO | $25.2M | 183K | ▲+10% Added · +17K sh | Q1 2026 | |
| 22 | KENNEDY CAPITAL MANAGEMENT LLC | $24.0M | 166K | ▲+0.8% Added · +1K sh | Q1 2026 | |
| 23 | Aberdeen Group plc | $23.8M | 164K | ▼−16% Reduced · −32K sh | Q1 2026 | |
| 24 | Bank of New York Mellon Corp | $22.1M | 152K | ▼−2.9% Reduced · −5K sh | Q1 2026 | |
| 25 | Granahan Investment Management, LLC | $20.9M | 144K | ▲+4.5% Added · +6K 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.
Last quarter, 10 funds opened a new position in MTRN and 20 added to an existing one, while 21 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 153 funds | $243.4B |
| APPLE INCAAPL | 151 funds | $267.2B |
| ALPHABET INC-CL AGOOGL | 151 funds | $150.1B |
| AMAZON.COM INCAMZN | 150 funds | $177.7B |
| JPMORGAN CHASE & COJPM | 150 funds | $57.4B |
| META PLATFORMS INC-CLASS AMETA | 148 funds | $100.4B |
| BROADCOM INCAVGO | 147 funds | $138.6B |
| NVIDIA CORPNVDA | 145 funds | $347.2B |
| ELI LILLY & COLLY | 145 funds | $70.9B |
| ALPHABET INC-CL CGOOG | 144 funds | $112.8B |
| GENERAL ELECTRICGE | 144 funds | $25.6B |
| VISA INC-CLASS A SHARESV | 142 funds | $52.6B |
Ranked by how many of MTRN's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| May 29, 2026 | PHILLIPPY ROBERT J | Director | Sell (S) | 1K | $287K |
| May 29, 2026 | PHILLIPPY ROBERT J | Director | Sell (S) | 1K | $237K |
| May 29, 2026 | PHILLIPPY ROBERT J | Director | Sell (S) | 740 | $162K |
| May 29, 2026 | PHILLIPPY ROBERT J | Director | Sell (S) | 356 | $78K |
| May 13, 2026 | KHILNANI VINOD M | Director | Sell (S) | 735 | $151K |
| May 13, 2026 | KHILNANI VINOD M | Director | Sell (S) | 752 | $155K |
| May 13, 2026 | KHILNANI VINOD M | Director | Sell (S) | 410 | $85K |
| May 13, 2026 | KHILNANI VINOD M | Director | Sell (S) | 603 | $126K |
| May 8, 2026 | Chadwick Shelly Marie | Vice President, Finance & CFO | Sell (S) | 1K | $237K |
| Mar 3, 2026 | Chemnitz Gregory R. | VP General Counsel & Secretary | Sell (S) | 1K | $171K |
| Mar 3, 2026 | Chemnitz Gregory R. | VP General Counsel & Secretary | Sell (S) | 3K | $540K |
| Mar 3, 2026 | Chadwick Shelly Marie | Vice President, Finance & CFO | Sell (S) | 1K | $163K |
Connected entities for MTRN
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/MTRN/capital-change-brief"
Use Arkolith's capital_change_brief for MTRN. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
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.