MGNX's three largest insider shareholders as of June 18, 2026 are Target N V Biotech (TenPercentOwner, 9.93Mn shares), Scott Koenig (President And Ceo, 867.24K shares), Scott Koenig (President And Ceo, 427.48K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Federica F. O'Brien | - | 11,000 | 0 | 22 May, 2025 |
| Edward Hurwitz | - | 44,074 | 0 | 22 May, 2025 |
| William K Heiden | - | 111,000 | 0 | 21 Aug, 2025 |
| Target N V Biotech | - | 9,929,963 | 0 | 04 Oct, 2023 |
| Margaret Liu | - | 11,000 | 0 | 22 May, 2025 |
| Meenu Chhabra | - | 11,000 | 0 | 22 May, 2025 |
| Scott Thomas Jackson | - | 11,000 | 0 | 22 May, 2025 |
| Lynn Cilinski | Vp, Controller And Treasurer | 6,213 | 0 | 20 Feb, 2024 |
| James Karrels | Svp And Cfo | 206,037 | 0 | 17 Feb, 2026 |
| Scott Koenig | President And Ceo | 867,240 | 0 | 17 Feb, 2026 |
| Eric Blasius Risser | President And Ceo | 77,169 | 0 | 17 Feb, 2026 |
| Ezio Bonvini | Sr Vp, Research Cso | 145,799 | 0 | 17 Feb, 2026 |
| Karen Jean Ferrante | - | 11,000 | 0 | 22 May, 2025 |
| Stephen L. Eck | Chief Medical Officer | 29,377 | 0 | 19 Feb, 2025 |
| Thomas Spitznagel | Sr Vp, Technical Ops | 38,543 | 0 | 17 Feb, 2026 |
| Jeffrey Stuart Peters | Senior Vp, Gc, And Secretary | 31,105 | 0 | 17 Feb, 2026 |
| Jay Philip Siegel | - | 11,000 | 0 | 22 May, 2025 |
| Beth Ann Smith | Vp, Controller Treasurer | 12,781 | 0 | 17 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 15 Feb, 2026 | Thomas Spitznagel | Common Stock | A | 13,332 | - | 44,063 | D | M |
| 15 Feb, 2026 | Scott Koenig | Common Stock | A | 21,165 | $0.00 | 867,240 | D | M |
| 15 Feb, 2026 | James Karrels | Common Stock | A | 14,999 | - | 211,827 | D | M |
| 15 Feb, 2026 | Jeffrey Stuart Peters | Common Stock | A | 13,332 | - | 36,252 | D | M |
| 15 Feb, 2026 | Eric Blasius Risser | Common Stock | A | 16,665 | - | 83,602 | D | M |
| 15 Feb, 2026 | Beth Ann Smith | Common Stock | A | 1,095 | - | 13,204 | D | M |
| 15 Feb, 2026 | Beth Ann Smith | Common Stock | A | 1,095 | - | 13,204 | D | M |
| 15 Feb, 2026 | Eric Blasius Risser | Common Stock | A | 16,665 | - | 83,602 | D | M |
| 15 Feb, 2026 | Ezio Bonvini | Common Stock | A | 16,665 | - | 152,232 | D | M |
| 15 Feb, 2026 | Thomas Spitznagel | Common Stock | A | 13,332 | - | 44,063 | D | M |
| 15 Feb, 2026 | Jeffrey Stuart Peters | Common Stock | A | 13,332 | - | 36,252 | D | M |
| 15 Feb, 2026 | James Karrels | Common Stock | D | 5,790 | $1.71 | 206,037 | D | F |
| 15 Feb, 2026 | Jeffrey Stuart Peters | Common Stock | D | 5,147 | $1.71 | 31,105 | D | F |
| 15 Feb, 2026 | Beth Ann Smith | Common Stock | D | 423 | $1.71 | 12,781 | D | F |
| 15 Feb, 2026 | Jeffrey Stuart Peters | Common Stock | D | 5,147 | $1.71 | 31,105 | D | F |
| 15 Feb, 2026 | Eric Blasius Risser | Common Stock | D | 6,433 | $1.71 | 77,169 | D | F |
| 15 Feb, 2026 | Thomas Spitznagel | Common Stock | D | 5,520 | $1.71 | 38,543 | D | F |
| 15 Feb, 2026 | Thomas Spitznagel | Common Stock | D | 5,520 | $1.71 | 38,543 | D | F |
| 15 Feb, 2026 | Beth Ann Smith | Common Stock | D | 423 | $1.71 | 12,781 | D | F |
| 15 Feb, 2026 | Scott Koenig | Restricted Stock Unit | D | 21,165 | $0.00 | 0 | D | M |