229 tracked 13F filers disclose a position in MTX as of the latest SEC 13F filings, a combined $2.0B 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. | $341.2M | 4.8M | ▲+0.8% Added · +38K sh | Q1 2026 | |
| 2 | FMR LLC | $302.4M | 4.3M | ▲+57% Added · +1.5M sh | Q1 2026 | |
| 3 | DIMENSIONAL FUND ADVISORS LP | $140.0M | 2.0M | ▼~0% Reduced · −619 sh | Q1 2026 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $134.8M | 1.9M | →First observed position No prior filed position | Q1 2026 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $97.0M | 1.4M | →First observed position No prior filed position | Q1 2026 | |
| 6 | STATE STREET CORP | $85.8M | 1.2M | ▼−1.0% Reduced · −12K sh | Q1 2026 | |
| 7 | AMERICAN CENTURY COMPANIES INC | $72.3M | 1.0M | ▼−23% Reduced · −299K sh | Q1 2026 | |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | $67.9M | 957K | ▲+6.6% Added · +60K sh | Q1 2026 | |
| 9 | BRANDES INVESTMENT PARTNERS, LP | $59.6M | 841K | ▲+2.6% Added · +21K sh | Q1 2026 | |
| 10 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $39.8M | 561K | ▲+41% Added · +162K sh | Q1 2026 | |
| 11 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $38.8M | 547K | ▼−8.4% Reduced · −50K sh | Q1 2026 | |
| 12 | SNYDER CAPITAL MANAGEMENT L P | $35.6M | 501K | ▼−7.1% Reduced · −38K sh | Q1 2026 | |
| 13 | AMERIPRISE FINANCIAL INC | $33.3M | 469K | ▲+3.4% Added · +15K sh | Q1 2026 | |
| 14 | Nuveen, LLC | $28.8M | 406K | ▲+1.2% Added · +5K sh | Q1 2026 | |
| 15 | D. E. Shaw & Co., Inc. | $26.0M | 367K | ▼−9.2% Reduced · −37K sh | Q1 2026 | |
| 16 | GOLDMAN SACHS GROUP INC | $24.9M | 350K | ▲+13% Added · +40K sh | Q1 2026 | |
| 17 | Allspring Global Investments Holdings, LLC | $24.9M | 348K | ▼−15% Reduced · −61K sh | Q1 2026 | |
| 18 | NORTHERN TRUST CORP | $24.2M | 341K | ▲+5.7% Added · +18K sh | Q1 2026 | |
| 19 | BANK OF AMERICA CORP /DE/ | $23.8M | 335K | ▼−0.3% Reduced · −1K sh | Q1 2026 | |
| 20 | MORGAN STANLEY | $19.5M | 274K | ▼−2.8% Reduced · −8K sh | Q1 2026 | |
| 21 | Bank of New York Mellon Corp | $19.2M | 271K | ▼−2.4% Reduced · −7K sh | Q1 2026 | |
| 22 | GAMCO INVESTORS, INC. ET AL | $18.0M | 255K | ▼−7.8% Reduced · −22K sh | Q1 2026 | |
| 23 | AQR CAPITAL MANAGEMENT LLC | $15.4M | 217K | ▲+33% Added · +53K sh | Q1 2026 | |
| 24 | VANGUARD FIDUCIARY TRUST CO | $14.3M | 201K | →First observed position No prior filed position | Q1 2026 | |
| 25 | PANAGORA ASSET MANAGEMENT INC | $14.0M | 198K | ▲+0.2% Added · +405 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, 1 fund opened a new position in MTX and 25 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 | 85 funds | $44.8B |
| BROADCOM INCAVGO | 85 funds | $23.2B |
| META PLATFORMS INC-CLASS AMETA | 85 funds | $18.7B |
| TESLA INCTSLA | 85 funds | $12.2B |
| ELI LILLY & COLLY | 85 funds | $11.5B |
| VISA INC-CLASS A SHARESV | 85 funds | $8.5B |
| MICRON TECHNOLOGY INCMU | 85 funds | $8.1B |
| COSTCO WHOLESALE CORPCOST | 85 funds | $7.5B |
| UNITEDHEALTH GROUP INCUNH | 85 funds | $4.3B |
| BRISTOL-MYERS SQUIBB COBMY | 85 funds | $2.7B |
| NVIDIA CORPNVDA | 84 funds | $60.7B |
| APPLE INCAAPL | 84 funds | $51.4B |
Ranked by how many of MTX's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| May 14, 2026 | DIETRICH DOUGLAS T | CHAIRMAN AND CEO, Director | Sell (S) | 22K | $1.8M |
| May 11, 2026 | JORDAN TIMOTHY | Vice President | Sell (S) | 6K | $482K |
| Dec 29, 2025 | MONAGLE DJ III | Group President | Sell (S) | 23K | $1.4M |
| Nov 21, 2025 | ARGIRAKIS BRETT | Group President | Sell (S) | 7K | $381K |
| Jun 16, 2025 | Motwani Rocky | Director | Buy (P) | 370 | $20K |
| May 2, 2025 | JOHNSON KRISTINA M | Director | Buy (P) | 1K | $54K |
| Apr 30, 2025 | DIETRICH DOUGLAS T | CHAIRMAN AND CEO, Director | Buy (P) | 2K | $103K |
| Apr 30, 2025 | ALDAG ERIK | SVP FINANCE AND TREASURY, CFO | Buy (P) | 1K | $50K |
| Jun 24, 2024 | MONAGLE DJ III | Group President | Sell (S) | 14K | $1.2M |
| Jun 18, 2024 | Hastings Jonathan J | Senior Vice President | Sell (S) | 22K | $1.8M |
| Jun 17, 2024 | ARGIRAKIS BRETT | Group President | Sell (S) | 2K | $190K |
| Jun 12, 2024 | Hastings Jonathan J | Senior Vice President | Sell (S) | 800 | $69K |
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/MTX/capital-change-brief"
Use Arkolith's capital_change_brief for MTX. 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 MTX. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.