FDMT
4D Molecular Therapeutics Inc
NASDAQ: FDMT · HEALTHCARE · BIOTECHNOLOGY
$12.93
+8.11% today
Updated 2026-10-28
Market cap
$697.18M
P/E ratio
—
P/S ratio
7.58x
EPS (TTM)
$-2.60
Dividend yield
—
52W range
$7 – $17
Volume
1.0M
4D Molecular Therapeutics Inc (FDMT) Insider transactions
Net insider activity
Net buying (2,574,704 shares)
Buy transactions
47
Sell transactions
53
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | — | — |
| 2026-09-16 | BIZILY, SCOTT | Chief Legal Officer | Buy | 1,635 | $4.14 | $6768.90 |
| 2026-09-14 | KIRN, DAVID | Director, See Remarks | Sale | 58,333 | $13.90 | $811003.70 |
| 2026-09-01 | BIZILY, SCOTT | Chief Legal Officer | Sale | 584 | — | — |
| 2026-09-01 | BIZILY, SCOTT | Chief Legal Officer | Buy | 584 | $6.49 | $3790.16 |
| 2026-08-19 | KIRN, DAVID | Director, See Remarks | Sale | 50,000 | — | — |
| 2026-08-19 | KIRN, DAVID | Director, See Remarks | Buy | 50,000 | $4.14 | $207000.00 |
| 2026-08-19 | KIRN, DAVID | Director, See Remarks | Sale | 43,149 | $15.36 | $662621.93 |
| 2026-08-19 | KIRN, DAVID | Director, See Remarks | Sale | 25,927 | $16.42 | $425651.34 |
| 2026-08-17 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | — | — |
| 2026-08-17 | BIZILY, SCOTT | Chief Legal Officer | Buy | 1,635 | $4.14 | $6768.90 |
| 2026-08-13 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | — | — |
| 2026-08-13 | BIZILY, SCOTT | Chief Legal Officer | Buy | 1,635 | $4.14 | $6768.90 |
| 2026-08-04 | KIRN, DAVID | Director, See Remarks | Sale | 26,842 | $10.23 | $274596.34 |
| 2026-08-03 | KIRN, DAVID | Director, See Remarks | Sale | 12,415 | $10.05 | $124722.33 |
| 2026-07-10 | KIRN, DAVID | Director, See Remarks | Sale | 15,283 | $12.01 | $183559.53 |
| 2026-07-10 | KIRN, DAVID | Director, See Remarks | Sale | 442 | $12.84 | $5673.29 |
| 2026-07-09 | KIRN, DAVID | Director, See Remarks | Sale | 42,608 | $12.87 | $548177.48 |
| 2026-06-30 | BIZILY, SCOTT | Chief Legal Officer | Sale | 5,752 | — | — |
| 2026-06-30 | BIZILY, SCOTT | Chief Legal Officer | Sale | 814 | — | — |
| 2026-06-30 | BIZILY, SCOTT | Chief Legal Officer | Sale | 6,566 | $14.00 | $91924.00 |
| 2026-06-30 | BIZILY, SCOTT | Chief Legal Officer | Buy | 5,752 | $6.49 | $37330.48 |
| 2026-06-30 | BIZILY, SCOTT | Chief Legal Officer | Buy | 814 | $4.14 | $3369.96 |
| 2026-06-23 | BIZILY, SCOTT | Chief Legal Officer | Sale | 9,810 | — | — |
| 2026-06-23 | BIZILY, SCOTT | Chief Legal Officer | Sale | 9,810 | $12.00 | $117720.00 |
| 2026-06-22 | KIRN, DAVID | Director, See Remarks | Sale | 114,746 | $10.47 | $1.20M |
| 2026-06-17 | TOMASELLO, SHAWN | Director | Buy | 50,000 | — | — |
| 2026-06-17 | THEUER, CHARLES | Director | Buy | 50,000 | — | — |
| 2026-06-17 | SBLENDORIO, GLENN | Director | Buy | 50,000 | — | — |
| 2026-06-17 | MILLIGAN, JOHN F | Director | Buy | 75,000 | — | — |
| 2026-06-17 | MILLER-RICH, NANCY | Director | Buy | 50,000 | — | — |
| 2026-06-17 | GRAY, SUSANNAH | Director | Buy | 50,000 | — | — |
| 2026-06-17 | CHACKO, JACOB | Director | Buy | 50,000 | — | — |
| 2026-06-01 | KIRN, DAVID | Director, See Remarks | Sale | 1,922 | $10.02 | $19257.86 |
| 2026-03-25 | SIMMS, CHRISTOPHER PAUL | See Remarks | Buy | 219,000 | — | — |
| 2026-03-25 | KIRN, DAVID | Director, Chief Executive Officer | Buy | 750,000 | — | — |
| 2026-03-25 | BIZILY, SCOTT | Chief Legal Officer | Buy | 217,000 | — | — |
| 2026-03-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 865 | — | — |
| 2026-03-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 221 | — | — |
| 2026-03-20 | GUPTA, ASHOO | VP, Finance and Controller | Buy | 865 | — | — |
| 2026-03-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 310 | $8.61 | $2669.10 |
| 2026-03-20 | GUPTA, ASHOO | VP, Finance and Controller | Buy | 221 | — | — |
| 2026-03-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 80 | $8.61 | $688.80 |
| 2026-01-05 | SBLENDORIO, GLENN | Director | Buy | 45,000 | — | — |
| 2025-12-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 866 | — | — |
| 2025-12-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 220 | — | — |
| 2025-12-20 | GUPTA, ASHOO | VP, Finance and Controller | Buy | 866 | — | — |
| 2025-12-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 310 | $8.68 | $2690.80 |
| 2025-12-20 | GUPTA, ASHOO | VP, Finance and Controller | Buy | 220 | — | — |
| 2025-12-20 | GUPTA, ASHOO | VP, Finance and Controller | Sale | 79 | $8.68 | $685.72 |
| 2025-12-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | — | — |
| 2025-12-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | $10.90 | $17821.50 |
| 2025-12-12 | THEUER, CHARLES | Director | Sale | 9,333 | — | — |
| 2025-12-12 | THEUER, CHARLES | Director | Buy | 9,333 | $1.14 | $10639.62 |
| 2025-12-09 | HUMER, KRISTIAN | Chief Financial Officer | Buy | 480,000 | — | — |
| 2025-11-17 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | — | — |
| 2025-11-17 | BIZILY, SCOTT | Chief Legal Officer | Buy | 1,635 | $4.14 | $6768.90 |
| 2025-10-24 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,084 | — | — |
| 2025-10-24 | BIZILY, SCOTT | Chief Legal Officer | Sale | 2,678 | $12.00 | $32136.00 |
| 2025-10-24 | BIZILY, SCOTT | Chief Legal Officer | Buy | 1,084 | $6.49 | $7035.16 |
| 2025-10-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | — | — |
| 2025-10-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,635 | $10.17 | $16627.95 |
| 2025-10-09 | BIZILY, SCOTT | Chief Legal Officer | Sale | 2,408 | $10.00 | $24080.00 |
| 2025-09-23 | BIZILY, SCOTT | Chief Legal Officer | Sale | 2,407 | $8.00 | $19256.00 |
| 2025-06-17 | TOMASELLO, SHAWN | Director | Buy | 22,500 | — | — |
| 2025-06-17 | THEUER, CHARLES | Director | Buy | 22,500 | — | — |
| 2025-06-17 | MILLIGAN, JOHN F | Director | Buy | 33,750 | — | — |
| 2025-06-17 | MILLER-RICH, NANCY | Director | Buy | 22,500 | — | — |
| 2025-06-17 | GRAY, SUSANNAH | Director | Buy | 22,500 | — | — |
| 2025-06-17 | CHACKO, JACOB | Director | Buy | 22,500 | — | — |
| 2025-03-06 | MEHRA, UNEEK | See Remarks | Buy | 130,000 | — | — |
| 2025-03-06 | KIRN, DAVID | Director, Chief Executive Officer | Buy | 267,500 | — | — |
| 2025-03-06 | KIM, ROBERT YOUNG | Chief Medical Officer | Buy | 92,300 | — | — |
| 2025-03-06 | KAMAL, FARIBORZ | President & COO | Buy | 178,400 | — | — |
| 2025-03-06 | BIZILY, SCOTT | Chief Legal Officer | Buy | 78,500 | — | — |
| 2024-12-09 | RA, CAPITAL MANAGEMENT, L.P. | 10% Owner | Buy | 535,000 | — | — |
| 2024-12-09 | RA, CAPITAL MANAGEMENT, L.P. | 10% Owner | Sale | 535,000 | — | — |
| 2024-11-08 | BVF, PARTNERS L P/IL | See Explanation of Responses | Buy | 3,062,000 | — | — |
| 2024-11-08 | BVF, PARTNERS L P/IL | See Explanation of Responses | Buy | 2,378,000 | — | — |
| 2024-11-08 | BVF, PARTNERS L P/IL | See Explanation of Responses | Buy | 240,000 | — | — |
| 2024-11-08 | BVF, PARTNERS L P/IL | See Explanation of Responses | Sale | 3,062,000 | — | — |
| 2024-11-08 | BVF, PARTNERS L P/IL | See Explanation of Responses | Sale | 2,378,000 | — | — |
| 2024-11-08 | BVF, PARTNERS L P/IL | See Explanation of Responses | Sale | 240,000 | — | — |
| 2024-09-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 500 | — | — |
| 2024-09-16 | BIZILY, SCOTT | Chief Legal Officer | Buy | 500 | $6.49 | $3245.00 |
| 2024-08-19 | BIZILY, SCOTT | Chief Legal Officer | Sale | 500 | — | — |
| 2024-08-19 | BIZILY, SCOTT | Chief Legal Officer | Buy | 500 | $6.49 | $3245.00 |
| 2024-07-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,250 | — | — |
| 2024-07-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 500 | — | — |
| 2024-07-16 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,750 | $27.11 | $47442.50 |
| 2024-07-16 | BIZILY, SCOTT | Chief Legal Officer | Buy | 1,250 | $8.04 | $10050.00 |
| 2024-07-16 | BIZILY, SCOTT | Chief Legal Officer | Buy | 500 | $6.49 | $3245.00 |
| 2024-07-11 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,996 | — | — |
| 2024-07-11 | BIZILY, SCOTT | Chief Legal Officer | Sale | 1,996 | $25.00 | $49900.00 |
| 2024-07-10 | KIRN, DAVID | Director, Chief Executive Officer | Sale | 11,653 | — | — |
| 2024-07-10 | KIRN, DAVID | Director, Chief Executive Officer | Sale | 1,270 | — | — |
| 2024-07-10 | KIRN, DAVID | Director, Chief Executive Officer | Sale | 12,923 | $22.49 | $290598.21 |
| 2024-07-10 | KIRN, DAVID | Director, Chief Executive Officer | Buy | 11,653 | $14.42 | $168036.26 |
| 2024-07-10 | KIRN, DAVID | Director, Chief Executive Officer | Buy | 1,270 | $15.78 | $20040.60 |
| 2024-07-01 | BIZILY, SCOTT | Chief Legal Officer | Sale | 2,916 | — | — |
Frequently asked questions
Are FDMT insiders buying or selling?
Over the transactions on record, FDMT insiders have been net sellers, with about $4.97M in stock sold across 53 sales, against 16 open-market purchases.
Does insider selling at FDMT mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which FDMT insiders are selling the most?
Recent selling is concentrated in a few names. KIRN, DAVID accounts for the largest share on record, with about $4.55M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.