🕵️ Definium Therapeutics, Inc. ($DFTX)
SEC insider & ownership activity, last 12 months · CIK 1813814 · every row links its SEC filing
Over the last 12 months insiders sold $4.4M with no open-market buying against it. Robert B Barrow sold $2.4M through a 10b5-1 trading plan in 4 lots (Sep–Jun). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 5 sellers, $4.4M (14 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Robert B Barrow | 0 | – | 4 | $2.4M | Jun 25, 2026 |
| Mark Sullivan | 0 | – | 4 | $1.0M | Jun 25, 2026 |
| Daniel Rollings Karlin | 0 | – | 4 | $749K | Jun 25, 2026 |
| Brandi Roberts | 0 | – | 1 | $136K | Jun 25, 2026 |
| Matthew Thomas Wiley | 0 | – | 1 | $129K | Jun 25, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 8.3% | 13G | Feb 5, 2025 | filing ↗ | |
| Commodore Capital LP | 7.2% | 13G | Feb 17, 2026 | filing ↗ | |
| Commodore Capital Master LP | 7.2% | 13G | Feb 17, 2026 | filing ↗ | |
| Robert Egen Atkinson | 7.2% | 13G | Feb 17, 2026 | filing ↗ | |
| Michael Kramarz | 7.2% | 13G | Feb 17, 2026 | filing ↗ | |
| Driehaus Capital Management LLC | 6.6% | 13G | Feb 17, 2026 | filing ↗ | |
| Avoro Capital Advisors LLC | 5.1% | 13G | Feb 17, 2026 | filing ↗ | |
| Behzad Aghazadeh | 5.1% | 13G | Feb 17, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Mark Sullivan | $548K | Jun 25, 2026 | filing ↗ |
| Matthew Thomas Wiley | $121K | Jun 25, 2026 | filing ↗ |
| Brandi Roberts | $127K | Jun 25, 2026 | filing ↗ |
| Daniel Rollings Karlin | $423K | Jun 25, 2026 | filing ↗ |
| Robert B Barrow | $1.2M | Jun 25, 2026 | filing ↗ |
| Robert B Barrow | $451K | Mar 25, 2026 | filing ↗ |
| Daniel Rollings Karlin | $148K | Mar 25, 2026 | filing ↗ |
| Mark Sullivan | $198K | Mar 25, 2026 | filing ↗ |
| Karlin, DAN | $74K | Dec 26, 2025 | filing ↗ |
| Sullivan, MARK | $148K | Dec 26, 2025 | filing ↗ |
| Barrow, Robert | $339K | Dec 26, 2025 | filing ↗ |
| Mark Sullivan | $110K | Sep 25, 2025 | filing ↗ |
| Daniel Rollings Karlin | $75K | Sep 25, 2025 | filing ↗ |
| Robert B Barrow | $252K | Sep 25, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Material agreement (1.01) | Jun 22, 2026 | filing ↗ |
| Other events (8.01) | Jun 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 22, 2026 | filing ↗ |
| Other events (8.01) | Jun 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 22, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 11, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 11, 2026 | filing ↗ |
| Other events (8.01) | May 19, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 19, 2026 | filing ↗ |
| Other events (8.01) | May 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 12, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Other events (8.01) | Apr 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 22, 2026 | filing ↗ |
| Earnings (2.02) | Feb 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 26, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jan 28, 2026 | filing ↗ |
| Earnings (2.02) | Jan 9, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Jan 9, 2026 | filing ↗ |
| Other events (8.01) | Jan 9, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 9, 2026 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Other events (8.01) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |
| Material agreement (1.01) | Oct 29, 2025 | filing ↗ |
| Other events (8.01) | Oct 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 29, 2025 | filing ↗ |