Updated Jul 16, 2026 · Last SEC filing 2026-05-20
MACROGENICS INC (MGNX) has filed 10 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-05-20. 7 Form 8-K material event filings were reported by MGNX in the last 90 days. 1 Form 144 notices of proposed sale were filed for MGNX stock. InsiderAlpha tracks every MGNX SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0001125345 |
|---|
| Form 4 filings (90d) | 10 |
|---|---|
| Form 8-K filings (90d) | 7 |
| Form 144 notices (90d) | 1 |
| Latest Form 4 filing | 2026-05-20 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| STUMP DAVID C | Director | M — Option exercise | 3.8K | — | — | SEC | |
| Chhabra Meenu | Director | M — Option exercise | 3.8K | — | — | SEC | |
| SIEGEL JAY PHILIP | Director | M — Option exercise | 3.8K | — | — | SEC | |
| HURWITZ EDWARD | Director | M — Option exercise | 3.8K | — | — | SEC | |
| Ferrante Karen Jean | Director | M — Option exercise | 3.8K | — | — | SEC | |
| O'Brien Federica F. | Director | M — Option exercise | 3.8K | — | — | SEC | |
| Jackson Scott Thomas | Director | M — Option exercise | 3.8K | — | — | SEC | |
| HEIDEN WILLIAM K | Director | M — Option exercise | 3.8K | — | — | SEC | |
| Liu Margaret | Director | M — Option exercise | 3.8K | — | — | SEC | |
| Koenig Scott | Director | M — Option exercise | 21.2K | $0.00 | — | SEC | |
| Spitznagel Thomas | Sr VP, Technical Ops | M — Option exercise | 13.3K | — | — | SEC | |
| Bonvini Ezio | Sr VP, Research & CSO | M — Option exercise | 16.7K | — | — | SEC | |
| Risser Eric Blasius | President and CEO | M — Option exercise | 16.7K | — | — | SEC | |
| Risser Eric Blasius | President and CEO | F — Tax withholding / forfeiture | 6.4K | $1.71 | $11K | SEC | |
| Spitznagel Thomas | Sr VP, Technical Ops | F — Tax withholding / forfeiture | 5.5K | $1.71 | $9K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for MACROGENICS INC (MGNX). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| O'Brien Federica F. | 4 | — |
| Jackson Scott Thomas | 4 | — |
| Ferrante Karen Jean | 4 | — |
| HEIDEN WILLIAM K | 4 | — |
| Chhabra Meenu | 4 | — |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in MGNX insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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