Hacker Severin
Insider transactions at 1 company
This page shows all SEC Form 4 filings attributed to Hacker Severin. Form 4 disclosures are required whenever a corporate insider — director, officer, or 10%+ shareholder — buys, sells, or receives company stock. Each row represents a separate reported transaction. All data is sourced directly from the SEC EDGAR public database.
| Company | Title | Type | Shares | Price | Value | Date |
|---|---|---|---|---|---|---|
| DUOL | Chief Tech Officer, Co-Founder | C | 50,000 | — | — | Dec 8, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 280 | $176.68 | $49,470 | Nov 19, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,778 | $261.94 | $465,729 | Nov 4, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 680 | $317.68 | $216,022 | Oct 20, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 500 | $317.31 | $158,655 | Oct 6, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 2,300 | $287.81 | $661,963 | Sep 19, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 2,100 | $267.93 | $562,653 | Sep 5, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Gift | 10,000 | — | — | Aug 20, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,003 | $339.15 | $340,167 | Aug 19, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,133 | $344.99 | $390,874 | Aug 5, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,200 | $365.49 | $438,588 | Jul 21, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 200 | $386.91 | $77,382 | Jul 7, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,199 | $471.45 | $565,269 | Jun 20, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | C | 60,000 | — | — | Jun 6, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | $38.08 | $380,800 | Jun 5, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | $38.08 | $380,800 | May 19, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 400 | $502.26 | $200,904 | May 5, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | $38.08 | $380,800 | Apr 21, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 100 | $276.80 | $27,680 | Apr 7, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,360 | $301.62 | $410,203 | Mar 19, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 100 | $294.74 | $29,474 | Mar 5, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | $14.42 | $144,200 | Feb 19, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 100 | $395.05 | $39,505 | Feb 5, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 300 | $338.82 | $101,646 | Jan 21, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | — | — | Jan 6, 2025 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,455 | $337.40 | $490,917 | Dec 19, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 2,000 | $342.63 | $685,260 | Dec 13, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 6,015 | $342.88 | $2,062,423 | Dec 12, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 3,992 | $337.33 | $1,346,621 | Dec 11, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | C | 3,000 | — | — | Nov 27, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | C | 15,000 | — | — | Aug 26, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 274 | $172.53 | $47,273 | Aug 1, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 568 | $202.62 | $115,088 | Jul 1, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 100 | $200.59 | $20,059 | Jun 3, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 300 | $224.43 | $67,329 | May 1, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 3,653 | $218.66 | $798,765 | Apr 1, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Gift | 10,000 | — | — | Mar 13, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,100 | $237.20 | $260,920 | Mar 1, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 2,300 | $177.69 | $408,687 | Feb 1, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 300 | $222.70 | $66,810 | Jan 2, 2024 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 900 | $212.03 | $190,827 | Dec 1, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 600 | $144.74 | $86,844 | Nov 1, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | — | — | Oct 2, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | C | 3,000 | — | — | Sep 15, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | — | — | Sep 1, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | C | 10,000 | — | — | May 1, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 2,022 | $143.11 | $289,368 | Apr 3, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 1,601 | $106.24 | $170,090 | Mar 1, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | Sale | 400 | $96.19 | $38,476 | Feb 1, 2023 |
| DUOL | Chief Tech Officer, Co-Founder | C | 2,800 | — | — | Jan 10, 2023 |