Hacker Severin (CIK 1870272) reported 275 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2025-12-09). Recent activity: Buy DUOL (50,000 shares), Sell DUOL (50,000 shares), Buy DUOL (10,000 shares), Sell DUOL (1,146 shares), Sell DUOL (1,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2025-12-09 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Buy | 50,000 | $0 |
| 2025-12-09 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 50,000 | $0 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Buy | 10,000 | $380,800 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 1,146 | $194,327 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 1,000 | $170,550 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 2,009 | $344,544 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 1,281 | $220,832 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 760 | $132,042 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 3,089 | $539,370 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 435 | $76,325 |
| 2025-11-20 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 280 | $49,470 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 744 | $191,892 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Buy | 10,000 | $380,800 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 936 | $242,209 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 560 | $145,438 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 165 | $43,088 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 1,778 | $465,729 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 560 | $147,263 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 1,625 | $429,098 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 760 | $201,415 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 1,727 | $459,589 |
| 2025-11-06 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 1,145 | $305,566 |
| 2025-10-22 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Buy | 10,000 | $380,800 |
| 2025-10-22 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 100 | $30,586 |
| 2025-10-22 | Duolingo, Inc. (DUOL) | Chief Tech Officer, Co-Founder | Sell | 600 | $184,530 |
Source: SEC Form 4 filings · as of 2025-12-09