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 MGX 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/MGX"
Use Arkolith to show who owns MGX, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $2.1M | 1.3M | ▲+2.3% Added · +29K sh | Q4 2025 | |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | $1.4M | 1.1M | ▲New +1.1M sh | Q1 2026 | |
| 3 | RENAISSANCE TECHNOLOGIES LLC | $1.1M | 788K | ▲+25% Added · +160K sh | Q1 2026 | |
| 4 | TWO SIGMA INVESTMENTS, LP | $666K | 497K | ▲+13% Added · +55K sh | Q1 2026 | |
| 5 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $530K | 396K | —Held | Q1 2026 | |
| 6 | JACOBS LEVY EQUITY MANAGEMENT, INC | $512K | 382K | ▲New +382K sh | Q1 2026 | |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $480K | 358K | ▲+17% Added · +52K sh | Q1 2026 | |
| 8 | BlackRock, Inc. | $308K | 230K | ▲+2.7% Added · +6K sh | Q1 2026 | |
| 9 | WELLS FARGO & COMPANY/MN | $271K | 202K | ▲+71% Added · +84K sh | Q1 2026 | |
| 10 | VANGUARD FIDUCIARY TRUST CO | $228K | 170K | ▲New +170K sh | Q1 2026 | |
| 11 | MILLENNIUM MANAGEMENT LLC | $228K | 170K | ▼−28% Reduced · −65K sh | Q1 2026 | |
| 12 | JANE STREET GROUP, LLC | $203K | 151K | ▼−65% Reduced · −282K sh | Q1 2026 | |
| 13 | STATE STREET CORP | $161K | 120K | —Held | Q1 2026 | |
| 14 | Man Group plc | $105K | 79K | ▲+39% Added · +22K sh | Q1 2026 | |
| 15 | NORTHERN TRUST CORP | $101K | 75K | —Held | Q1 2026 | |
| 16 | BBR PARTNERS, LLC | $72K | 53K | —Held | Q1 2026 | |
| 17 | XTX Topco Ltd | $54K | 41K | ▼−41% Reduced · −28K sh | Q1 2026 | |
| 18 | MORGAN STANLEY | $37K | 28K | ▼−54% Reduced · −32K sh | Q1 2026 | |
| 19 | MARSHALL WACE, LLP | $37K | 28K | ▼−65% Reduced · −52K sh | Q1 2026 | |
| 20 | CITADEL ADVISORS LLC | $23K | 17K | ▼−90% Reduced · −161K sh | Q1 2026 | |
| 21 | LPL Financial LLC | $23K | 17K | ▲+49% Added · +6K sh | Q1 2026 | |
| 22 | UBS Group AG | $22K | 16K | ▼−36% Reduced · −9K sh | Q1 2026 | |
| 23 | DIMENSIONAL FUND ADVISORS LP | $17K | 13K | ▼−7.2% Reduced · −986 sh | Q1 2026 | |
| 24 | Point72 Asset Management, L.P. | $16K | 12K | ▼−56% Reduced · −15K sh | Q1 2026 | |
| 25 | MEEDER ASSET MANAGEMENT INC | $7K | 5K | —Held | 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 9, 2026 | Eckhardt Juergen | Director | Grant (A) | 21K | $0 |
| Jun 9, 2026 | Dere Willard H | Director | Grant (A) | 21K | $0 |
| Jun 9, 2026 | Reid Laurence | Director | Grant (A) | 17K | $0 |
| Jun 9, 2026 | BJERKHOLT ERIC | Director | Grant (A) | 21K | $0 |
| Jun 5, 2026 | Wein Matthew | See Remarks | Sell (S) | 558 | $725 |
| Jun 5, 2026 | Wapnick Pamela | Chief Financial Officer | Sell (S) | 3K | $4K |
| Jun 5, 2026 | Irish Jian | See Remarks, Director | Sell (S) | 4K | $5K |
| Mar 5, 2026 | Wein Matthew | See Remarks | Sell (S) | 482 | $771 |
| Mar 5, 2026 | Irish Jian | Chief Executive Officer, Director | Sell (S) | 2K | $3K |
| Mar 5, 2026 | Wapnick Pamela | Chief Financial Officer | Sell (S) | 2K | $3K |
| Dec 5, 2025 | Thomas Brian C. | Director | Sell (S) | 4K | $7K |
| Dec 5, 2025 | Wein Matthew | See Remarks | Sell (S) | 199 | $352 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 12 funds | $5.6B |
| AMAZON.COM INCAMZN | 12 funds | $5.5B |
| BROADCOM INCAVGO | 12 funds | $3.9B |
| ALPHABET INC-CL CGOOG | 12 funds | $3.4B |
| MASTERCARD INC - AMA | 12 funds | $1.6B |
| COSTCO WHOLESALE CORPCOST | 12 funds | $1.6B |
| ELI LILLY & COLLY | 12 funds | $1.5B |
| ARISTA NETWORKS INCANET | 12 funds | $1.4B |
| BOOKING HOLDINGS INCBKNG | 12 funds | $1.2B |
| CHEVRON CORPCVX | 12 funds | $1.1B |
| LAM RESEARCH CORPLRCX | 12 funds | $1.0B |
| EXXON MOBIL CORPXOM | 12 funds | $989.8M |
Ranked by how many of MGX'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 MGX. 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.