COGT Cogent Biosciences

• None no insider bought on the open market
• $382M sold by 5 insiders outside a trading plan
• $1.7M sold by 1 insider under 10b5-1 plans

1. Insider
   Trade
   Value
   Traded, filed
2. Arlene Morris Director
   Planned sale
   $1.7M 45,510 shares at $37.12 100% of stake
   Traded Aug 27 Filed Aug 31
   ↗
3. Fairmount Funds Management LLC Director
   Sale
   $243M 7,000,000 shares at $34.66 56% of stake
   Traded Mar 31 Filed Mar 31
   ↗
4. Fairmount Funds Management LLC Director
   Sale
   $127M 3,500,000 shares at $36.40 39% of stake
   Traded Jan 22 Filed Jan 22
   ↗
5. Evan Kearns Chief Legal Officer
   Sale
   $2.5M 65,000 shares at $38.70 37% of stake
   Traded Dec 26, 2025 Filed Dec 30, 2025
   ↗
6. John L. Green CFO
   Sale
   $3M 77,000 shares at $38.68 37% of stake
   Traded Dec 26, 2025 Filed Dec 30, 2025
   ↗
7. Jessica Sachs Chief Medical Officer
   Sale
   $3.2M 82,642 shares at $38.70 38% of stake
   Traded Dec 26, 2025 Filed Dec 30, 2025
   ↗
8. John Edward Robinson Chief Scientific Officer
   Sale
   $3.5M 90,000 shares at $38.74 39% of stake
   Traded Dec 26, 2025 Filed Dec 30, 2025
   ↗

Also filed in the last 12 months, not counted as buying or selling: 12 stock grants, 6 share withholdings for taxes, 2 gifts, 2 option exercises, and 1 conversion.