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 MUX 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/MUX"
Use Arkolith to show who owns MUX, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | STATE STREET CORP | $68.7M | 3.4M | ▲+54% Added · +1.2M sh | Q1 2026 | |
| 2 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $43.6M | 2.1M | ▼−3.2% Reduced · −70K sh | Q1 2026 | |
| 3 | BlackRock, Inc. | $39.8M | 1.9M | ▲+6.1% Added · +112K sh | Q1 2026 | |
| 4 | Tidal Investments LLC | $27.8M | 1.4M | ▼−7.7% Reduced · −114K sh | Q1 2026 | |
| 5 | TWO SIGMA INVESTMENTS, LP | $26.6M | 1.3M | ▲+81% Added · +582K sh | Q1 2026 | |
| 6 | DIMENSIONAL FUND ADVISORS LP | $25.9M | 1.3M | ▲+16% Added · +173K sh | Q1 2026 | |
| 7 | BNP PARIBAS FINANCIAL MARKETS | $22.2M | 1.1M | ▲+8.8% Added · +88K sh | Q1 2026 | |
| 8 | UBS Group AG | $22.0M | 1.1M | ▼−22% Reduced · −311K sh | Q1 2026 | |
| 9 | MORGAN STANLEY | $17.3M | 847K | ▼−13% Reduced · −131K sh | Q1 2026 | |
| 10 | VANGUARD GROUP INC | $17.2M | 928K | ▲+4.9% Added · +43K sh | Q4 2025 | |
| 11 | FMR LLC | $15.5M | 757K | ▲+28% Added · +167K sh | Q1 2026 | |
| 12 | Mawer Investment Management Ltd. | $14.4M | 707K | ▲+183% Added · +457K sh | Q1 2026 | |
| 13 | BANK OF MONTREAL /CAN/ | $14.0M | 686K | ▲+895% Added · +617K sh | Q1 2026 | |
| 14 | Amundi | $13.8M | 675K | ▼−12% Reduced · −94K sh | Q1 2026 | |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | $12.3M | 603K | ▲+15% Added · +81K sh | Q1 2026 | |
| 16 | VOLORIDGE INVESTMENT MANAGEMENT, LLC | $12.1M | 592K | ▼−16% Reduced · −110K sh | Q1 2026 | |
| 17 | VANGUARD CAPITAL MANAGEMENT LLC | $11.4M | 556K | ▲New +556K sh | Q1 2026 | |
| 18 | ROYAL BANK OF CANADA | $10.9M | 535K | ▼−6.8% Reduced · −39K sh | Q1 2026 | |
| 19 | BANK OF AMERICA CORP /DE/ | $10.9M | 535K | ▲14× Added · +498K sh | Q1 2026 | |
| 20 | MARSHALL WACE, LLP | $9.6M | 471K | ▲+498% Added · +392K sh | Q1 2026 | |
| 21 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $9.1M | 445K | ▲+3.7% Added · +16K sh | Q1 2026 | |
| 22 | ALPS ADVISORS INC | $8.7M | 426K | ▲New +426K sh | Q1 2026 | |
| 23 | JPMORGAN CHASE & CO | $7.0M | 371K | ▼−17% Reduced · −73K sh | Q1 2026 | |
| 24 | BARCLAYS PLC | $6.6M | 324K | ▲+124% Added · +179K sh | Q1 2026 | |
| 25 | WELLS FARGO & COMPANY/MN | $6.6M | 323K | ▲79× Added · +319K 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 5, 2026 | Kaszas Stephen Douglas | Director | Buy (P) | 1K | $18K |
| Mar 19, 2026 | Darveau-Garneau Nicolas | Director | Grant (A) | 479 | $0 |
| Mar 19, 2026 | Diges Carmen L | General Counsel/Corp Sec | Grant (A) | 1K | $0 |
| Mar 19, 2026 | Asterbadi Dalia Nadine | Director | Grant (A) | 479 | $0 |
| Mar 19, 2026 | Florek John Casimir | Director | Grant (A) | 479 | $0 |
| Mar 19, 2026 | Ing Perry | Chief Financial Officer | Grant (A) | 2K | $0 |
| Mar 19, 2026 | Makori Michelle | Director | Grant (A) | 239 | $0 |
| Mar 19, 2026 | Shaver William M | Chief Operating Officer, Director | Grant (A) | 4K | $0 |
| Mar 19, 2026 | Shaver William M | Chief Operating Officer, Director | Grant (A) | 479 | $0 |
| Dec 20, 2025 | Shaver William M | Chief Operating Officer, Director | Option exercise (M) | 6K | $0 |
| Dec 20, 2025 | Shaver William M | Chief Operating Officer, Director | Option exercise (M) | 12K | $0 |
| Dec 20, 2025 | Spears Stephan Michael | VP Corporate Development | Option exercise (M) | 1K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| VISA INC-CLASS A SHARESV | 42 funds | $4.1B |
| MICROSOFT CORPMSFT | 41 funds | $16.1B |
| AMAZON.COM INCAMZN | 41 funds | $11.9B |
| AMERICAN EXPRESS COAXP | 41 funds | $1.4B |
| ALPHABET INC-CL AGOOGL | 40 funds | $11.7B |
| BROADCOM INCAVGO | 40 funds | $7.7B |
| META PLATFORMS INC-CLASS AMETA | 40 funds | $7.4B |
| ELI LILLY & COLLY | 40 funds | $4.7B |
| TESLA INCTSLA | 40 funds | $4.6B |
| PALANTIR TECHNOLOGIES INC-APLTR | 40 funds | $1.8B |
| NVIDIA CORPNVDA | 39 funds | $22.4B |
| APPLE INCAAPL | 39 funds | $18.8B |
Ranked by how many of MUX'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 MUX. 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.