Among active 13F managers last quarter, 3 opened and 27 added, while 20 reduced; the largest holder to move was American Century Companies Inc (−23%). Over the last 180 days, 2 insiders sold and none bought, a net -$2.2M in open-market trades.
The legs disagree, or only one of them leans.
260 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 | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.9M | $361.7M | ▲+1.6% Added · +79K sh | Q2 2026 | |
| 2 | FMR LLC | 4.6M | $343.0M | ▲+8.8% Added · +373K sh | Q2 2026 | |
| 3 | Dimensional Fund Advisors LP | 2.0M | $140.0M | ▼~0% Reduced · −619 sh | Q1 2026 | |
| 4 | Vanguard Portfolio Management LLC | 1.9M | $142.8M | ▲+1.5% Added · +29K sh | Q2 2026 | |
| 5 | Vanguard Capital Management LLC | 1.4M | $103.1M | ▲+1.9% Added · +27K sh | Q2 2026 | |
| 6 | State Street Corp | 1.3M | $93.6M | ▲+4.6% Added · +56K sh | Q2 2026 | |
| 7 | Geode Capital Management, LLC | 1.0M | $76.1M | ▲+7.4% Added · +71K sh | Q2 2026 | |
| 8 | American Century Companies Inc | 1.0M | $72.3M | ▼−23% Reduced · −299K sh | Q1 2026 | |
| 9 | Mirae Asset Global Etfs Holdings Ltd. | 561K | $39.8M | ▲+41% Added · +162K sh | Q1 2026 | |
| 10 | Charles Schwab Investment Management Inc | 547K | $38.8M | ▼−8.4% Reduced · −50K sh | Q1 2026 | |
| 11 | Snyder Capital Management L P | 489K | $36.1M | ▼−2.6% Reduced · −13K sh | Q2 2026 | |
| 12 | Ameriprise Financial Inc | 469K | $33.3M | ▲+3.4% Added · +15K sh | Q1 2026 | |
| 13 | Nuveen, LLC | 406K | $28.8M | ▲+1.2% Added · +5K sh | Q1 2026 | |
| 14 | D. E. Shaw & Co., Inc. | 367K | $26.0M | ▼−9.2% Reduced · −37K sh | Q1 2026 | |
| 15 | Goldman Sachs Group Inc | 350K | $24.9M | ▲+13% Added · +40K sh | Q1 2026 | |
| 16 | Northern Trust Corp | 341K | $24.2M | ▲+5.7% Added · +18K sh | Q1 2026 | |
| 17 | Bank Of America Corp | 335K | $23.8M | ▼−0.3% Reduced · −1K sh | Q1 2026 | |
| 18 | Brandes Investment Partners, LP | 286K | $21.2M | ▼−66% Reduced · −555K sh | Q2 2026 | |
| 19 | Morgan Stanley | 274K | $19.5M | ▼−2.8% Reduced · −8K sh | Q1 2026 | |
| 20 | Bank of New York Mellon Corp | 271K | $19.2M | ▼−2.4% Reduced · −7K sh | Q1 2026 | |
| 21 | Allspring Global Investments Holdings, LLC | 260K | $19.2M | ▼−25% Reduced · −88K sh | Q2 2026 | |
| 22 | Gamco Investors, Inc. Et Al | 255K | $18.0M | ▼−7.8% Reduced · −22K sh | Q1 2026 | |
| 23 | Panagora Asset Management Inc | 246K | $18.2M | ▲+25% Added · +48K sh | Q2 2026 | |
| 24 | AQR Capital Management LLC | 217K | $15.4M | ▲+33% Added · +53K sh | Q1 2026 | |
| 25 | Vanguard Fiduciary Trust Co | 206K | $15.3M | ▲+2.5% Added · +5K sh | Q2 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, 3 funds opened a new position in MTX and 27 added to an existing one, while 20 reduced. 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 | Their position there |
|---|---|---|
| Microsoft CorpMSFT | 133 funds | $198.9B |
| Nvidia CorpNVDA | 132 funds | $312.2B |
| Amazon.com IncAMZN | 131 funds | $152.6B |
| Alphabet Inc-CL AGOOGL | 131 funds | $135.3B |
| Alphabet Inc-CL CGOOG | 130 funds | $104.2B |
| Eli Lilly & CoLLY | 130 funds | $65.9B |
| Broadcom IncAVGO | 129 funds | $129.4B |
| JPMorgan Chase & CoJPM | 129 funds | $47.3B |
| Meta Platforms Inc-Class AMETA | 128 funds | $83.1B |
| Apple IncAAPL | 127 funds | $226.0B |
| Tesla IncTSLA | 127 funds | $56.2B |
| Visa Inc-Class A SharesV | 127 funds | $44.4B |
Ranked by how many of MTX's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in MTX.
| 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) 2 lots, same day | 9K | $766K |
One row per insider, day and transaction code; shares and value are summed across the lots. Every lot is on the full insider page and in the filing.
Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.
Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive
| Source | Buying | Selling | Net |
|---|---|---|---|
13F funds Top 100 holders by value, passive included; the hero counts active managers only | 55 | 36 | – |
Insiders Form 4 open-market | 0 | 2 | -$2.2M |
US House STOCK Act trades | 1 | 0 | +$8K |
Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.
Connected entities for MTX
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.