🕵️ Macrogenics Inc ($MGNX)
SEC insider & ownership activity, last 12 months · CIK 1125345 · every row links its SEC filing
Over the last 12 months insiders bought $151K with no open-market selling against it. William K. Heiden bought $151K in discretionary trades (Aug). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $151K (2 lots) · 0 sellers, $0 (0 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| William K. Heiden | 2 | $151K | 0 | – | Aug 20, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Armistice Capital, LLC | 9.5% | 13G | May 15, 2026 | filing ↗ | |
| Steven Boyd | 9.5% | 13G | May 15, 2026 | filing ↗ | |
| Blackrock, Inc. | 7.1% | 13G | Jul 29, 2026 | filing ↗ | |
| Bank of America Corp /DE/ | 5.1% | 13G | May 14, 2026 | filing ↗ | |
| Millennium Management LLC | exited | 13G | Jul 20, 2026 | filing ↗ | |
| Millennium Group Management LLC | exited | 13G | Jul 20, 2026 | filing ↗ | |
| Israel A. Englander | exited | 13G | Jul 20, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Thomas Spitznagel | $76K | Jul 13, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Other events (8.01) | Jul 23, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jul 1, 2026 | filing ↗ |
| Acquisition or disposition (2.01) | Jun 30, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 30, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 30, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 19, 2026 | filing ↗ |
| Earnings (2.02) | May 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 13, 2026 | filing ↗ |
| Material agreement (1.01) | May 11, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 11, 2026 | filing ↗ |
| Material agreement (1.01) | May 1, 2026 | filing ↗ |
| Other events (8.01) | May 1, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 1, 2026 | filing ↗ |
| Other events (8.01) | Apr 8, 2026 | filing ↗ |
| Earnings (2.02) | Mar 9, 2026 | filing ↗ |
| Other events (8.01) | Mar 2, 2026 | filing ↗ |
| Other events (8.01) | Feb 23, 2026 | filing ↗ |
| Officer/director changes (5.02) | Nov 14, 2025 | filing ↗ |
| Earnings (2.02) | Nov 12, 2025 | filing ↗ |
| Earnings (2.02) | Aug 14, 2025 | filing ↗ |
| Officer/director changes (5.02) | Aug 13, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 13, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 13, 2025 | filing ↗ |