92 tracked 13F filers disclose a position in MGNX as of the latest SEC 13F filings, a combined $118.1M 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 | 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 | →First observed position No prior filed position | 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 | MARSHALL WACE, LLP | $5.9M | 2.0M | ▲+58% Added · +741K sh | Q1 2026 | |
| 8 | WASATCH ADVISORS LP | $9.3M | 2.0M | ▲+29% Added · +459K sh | Q2 2026 | |
| 9 | RA CAPITAL MANAGEMENT, L.P. | $5.4M | 1.9M | ▲New +1.9M sh | Q1 2026 | |
| 10 | VANGUARD PORTFOLIO MANAGEMENT LLC | $3.5M | 1.2M | →First observed position No prior filed position | Q1 2026 | |
| 11 | BlackRock, Inc. | $3.4M | 1.2M | ▲+0.9% Added · +10K sh | Q1 2026 | |
| 12 | D. E. Shaw & Co., Inc. | $3.1M | 1.1M | ▲+40% Added · +302K sh | Q1 2026 | |
| 13 | Connor, Clark & Lunn Investment Management Ltd. | $2.5M | 867K | ▲+5.9% Added · +48K sh | Q1 2026 | |
| 14 | CITADEL ADVISORS LLC | $2.3M | 783K | ▼−24% Reduced · −253K sh | Q1 2026 | |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | $2.0M | 697K | ▲+6.4% Added · +42K sh | Q1 2026 | |
| 16 | JANE STREET GROUP, LLC | $1.8M | 609K | ▼−52% Reduced · −646K sh | Q1 2026 | |
| 17 | DIADEMA PARTNERS LP | $1.7M | 600K | ▲New +600K 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 | Walleye Capital LLC | $1.9M | 408K | ▲+22% Added · +73K sh | Q2 2026 | |
| 22 | VANGUARD FIDUCIARY TRUST CO | $983K | 340K | →First observed position No prior filed position | 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.
Last quarter, 15 funds opened a new position in MGNX and 11 added to an existing one, while 12 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 | 42 funds | $68.4B |
| ELI LILLY & COLLY | 42 funds | $19.5B |
| AMAZON.COM INCAMZN | 41 funds | $53.9B |
| META PLATFORMS INC-CLASS AMETA | 41 funds | $29.4B |
| COSTCO WHOLESALE CORPCOST | 41 funds | $13.4B |
| BRISTOL-MYERS SQUIBB COBMY | 41 funds | $5.0B |
| NVIDIA CORPNVDA | 40 funds | $106.6B |
| APPLE INCAAPL | 40 funds | $80.7B |
| ALPHABET INC-CL AGOOGL | 40 funds | $44.2B |
| JPMORGAN CHASE & COJPM | 40 funds | $16.2B |
| MICRON TECHNOLOGY INCMU | 40 funds | $15.5B |
| ADVANCED MICRO DEVICESAMD | 40 funds | $12.0B |
Ranked by how many of MGNX's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 20, 2025 | HEIDEN WILLIAM K | Director | Buy (P) | 50K | $74K |
| Aug 19, 2025 | HEIDEN WILLIAM K | Director | Buy (P) | 51K | $77K |
| Feb 15, 2025 | Smith Beth Ann | VP, Controller & Treasurer | Sell (S) | 423 | $1K |
| Apr 4, 2024 | Peters Jeffrey Stuart | Senior VP and General Counsel | Sell (S) | 5K | $95K |
| Apr 4, 2024 | Peters Jeffrey Stuart | Senior VP and General Counsel | Sell (S) | 43K | $640K |
| Apr 4, 2024 | Peters Jeffrey Stuart | Senior VP and General Counsel | Sell (S) | 147 | $2K |
| Apr 4, 2024 | Peters Jeffrey Stuart | Senior VP and General Counsel | Sell (S) | 232 | $4K |
| Apr 4, 2024 | Peters Jeffrey Stuart | Senior VP and General Counsel | Sell (S) | 3K | $58K |
| Mar 6, 2024 | Peters Jeffrey Stuart | Senior VP and General Counsel | Sell (S) | 20K | $422K |
| Mar 4, 2024 | Karrels James | SVP, CFO and Secretary | Sell (S) | 30K | $615K |
| Mar 4, 2024 | Spitznagel Thomas | Sr VP, Technical Ops | Sell (S) | 10K | $200K |
| Mar 4, 2024 | Risser Eric Blasius | Chief Operating Officer | Sell (S) | 15K | $300K |
Connected entities for MGNX
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/MGNX/capital-change-brief"
Use Arkolith's capital_change_brief for MGNX. 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 MGNX. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.