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 MGNX 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/MGNX"
Use Arkolith to show who owns MGNX, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | ARMISTICE CAPITAL, LLC | $17.4M | 6.0M | ▼−4.9% Reduced · −312K sh | Q1 2026 | |
| 2 | RENAISSANCE TECHNOLOGIES LLC | $8.6M | 3.0M | ▲+1.9% Added · +55K sh | Q1 2026 | |
| 3 | MILLENNIUM MANAGEMENT LLC | $8.1M | 2.8M | ▲+42% Added · +820K sh | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $7.7M | 2.7M | ▲New +2.7M sh | Q1 2026 | |
| 5 | TWO SIGMA INVESTMENTS, LP | $7.3M | 2.5M | ▲+153% Added · +1.5M sh | Q1 2026 | |
| 6 | BANK OF AMERICA CORP /DE/ | $6.9M | 2.4M | ▲+31% Added · +564K sh | Q1 2026 | |
| 7 | VANGUARD GROUP INC | $6.8M | 4.2M | ▲+0.1% Added · +3K sh | Q4 2025 | |
| 8 | MARSHALL WACE, LLP | $5.9M | 2.0M | ▲+58% Added · +741K sh | Q1 2026 | |
| 9 | RA CAPITAL MANAGEMENT, L.P. | $5.4M | 1.9M | ▲New +1.9M sh | Q1 2026 | |
| 10 | WASATCH ADVISORS LP | $4.5M | 1.6M | ▼−13% Reduced · −227K sh | Q1 2026 | |
| 11 | VANGUARD PORTFOLIO MANAGEMENT LLC | $3.5M | 1.2M | ▲New +1.2M sh | Q1 2026 | |
| 12 | BlackRock, Inc. | $3.4M | 1.2M | ▲+0.9% Added · +10K sh | Q1 2026 | |
| 13 | D. E. Shaw & Co., Inc. | $3.1M | 1.1M | ▲+40% Added · +302K sh | Q1 2026 | |
| 14 | Connor, Clark & Lunn Investment Management Ltd. | $2.5M | 867K | ▲+5.9% Added · +48K sh | Q1 2026 | |
| 15 | CITADEL ADVISORS LLC | $2.3M | 783K | ▼−24% Reduced · −253K sh | Q1 2026 | |
| 16 | GEODE CAPITAL MANAGEMENT, LLC | $2.0M | 697K | ▲+6.4% Added · +42K sh | Q1 2026 | |
| 17 | JANE STREET GROUP, LLC | $1.8M | 609K | ▼−52% Reduced · −646K sh | Q1 2026 | |
| 18 | Affinity Asset Advisors, LLC | $1.4M | 500K | ▲+3.2% Added · +16K sh | Q1 2026 | |
| 19 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.3M | 452K | ▲+560% Added · +384K sh | Q1 2026 | |
| 20 | JACOBS LEVY EQUITY MANAGEMENT, INC | $1.3M | 441K | ▼−51% Reduced · −460K sh | Q1 2026 | |
| 21 | VANGUARD FIDUCIARY TRUST CO | $983K | 340K | ▲New +340K sh | Q1 2026 | |
| 22 | Walleye Capital LLC | $969K | 335K | ▲10× Added · +302K sh | Q1 2026 | |
| 23 | UBS Group AG | $856K | 296K | ▲+148% Added · +177K sh | Q1 2026 | |
| 24 | STATE STREET CORP | $849K | 294K | ▲+7.0% Added · +19K sh | Q1 2026 | |
| 25 | Vestal Point Capital, LP | $809K | 280K | —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 |
|---|---|---|---|---|---|
| Feb 15, 2026 | Peters Jeffrey Stuart | Senior VP, GC, and Secretary | Tax withholding (F) | 5K | $9K |
| Feb 15, 2026 | Risser Eric Blasius | President and CEO, Director | Option exercise (M) | 17K | — |
| Feb 15, 2026 | Risser Eric Blasius | President and CEO, Director | Tax withholding (F) | 6K | $11K |
| Feb 15, 2026 | Risser Eric Blasius | President and CEO, Director | Option exercise (M) | 17K | $0 |
| Feb 15, 2026 | Karrels James | SVP and CFO | Option exercise (M) | 15K | — |
| Feb 15, 2026 | Smith Beth Ann | VP, Controller & Treasurer | Option exercise (M) | 1K | $0 |
| Feb 15, 2026 | Spitznagel Thomas | Sr VP, Technical Ops | Option exercise (M) | 13K | — |
| Feb 15, 2026 | Karrels James | SVP and CFO | Option exercise (M) | 15K | $0 |
| Feb 15, 2026 | Koenig Scott | Director | Option exercise (M) | 21K | $0 |
| Feb 15, 2026 | Peters Jeffrey Stuart | Senior VP, GC, and Secretary | Option exercise (M) | 13K | $0 |
| Feb 15, 2026 | Karrels James | SVP and CFO | Tax withholding (F) | 6K | $10K |
| Feb 15, 2026 | Bonvini Ezio | Sr VP, Research & CSO | Option exercise (M) | 17K | — |
| Company | Co-held by | Combined value |
|---|---|---|
| CHEVRON CORPCVX | 29 funds | $2.3B |
| NVIDIA CORPNVDA | 28 funds | $22.9B |
| APPLE INCAAPL | 28 funds | $17.2B |
| MICROSOFT CORPMSFT | 28 funds | $14.0B |
| AMAZON.COM INCAMZN | 28 funds | $12.9B |
| BROADCOM INCAVGO | 28 funds | $8.0B |
| ALPHABET INC-CL CGOOG | 28 funds | $7.0B |
| JPMORGAN CHASE & COJPM | 28 funds | $4.5B |
| MASTERCARD INC - AMA | 28 funds | $4.2B |
| ELI LILLY & COLLY | 28 funds | $3.6B |
| COSTCO WHOLESALE CORPCOST | 28 funds | $3.3B |
| NETFLIX INCNFLX | 28 funds | $2.1B |
Ranked by how many of MGNX'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 MGNX. 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.