| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Chief Tech Officer, Co-founder
1 company
Severin Hacker is Chief Tech Officer, Co-founder at DUOL. Severin Hacker's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $9K at current prices.
Historically, Severin Hacker's trades have earned a middling insider score of 58/100 across 57 rated trades. Over a 12-month horizon, 48.1% of those trades were profitable, with an average 12-month return of -10.2%.
The DUOL filings lean toward selling, a net 711,420 shares.
Severin Hacker has 72 Form 4 filings on record from July 2021 to May 2026, all as Chief Tech Officer, Co-founder at Duolingo (DUOL), 2021–2026.
The 571 reported transactions were 486 open-market sales, 65 conversions, 10 gifts and 7 tax withholdings, plus smaller numbers of other types.
Counted by filing, the open-market trades come to no purchases and 56 sales worth about $225.1M.
The largest open-market sale was 188,901 shares of DUOL at an average $339.54 on December 11, 2024, about $64.1M. Twelve months later DUOL was down 42%.
39 of the 40 sales since April 2023 were made under a Rule 10b5-1 trading plan; the other was not.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Nov 19, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $172.74 | $1,727,441.08 | -99.3% | -35.8% | - | |
| Nov 4, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $263.13 | $2,631,299.18 | -99.3% | -49.7% | - | |
| Oct 20, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $314.72 | $3,147,198.33 | -99.3% | -52.5% | -55.4% | |
| Oct 6, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $321.63 | $3,216,303.32 | -99.3% | -42.2% | -53.8% | |
| Sep 19, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $288.94 | $2,889,373.13 | -99.3% | -37.1% | -51.2% | |
| Sep 5, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,300 | $268.30 | $2,763,520.61 | -97.4% | -30.5% | -43.0% | |
| Aug 19, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $344.56 | $3,445,587.09 | -99.3% | -47.7% | -57.1% | |
| Aug 5, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $344.41 | $3,444,076.39 | -99.3% | -22.2% | -60.2% | |
| Jul 21, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,000 | $360.33 | $3,603,336.35 | -99.3% | -12.1% | -65.0% | |
| Jul 7, 2025 | DUOL Duolingo, Inc. | Chief Tech Officer, Co-founder | Sale+OE10b5-1 | 10,900 | $393.20 | $4,285,901.85 | -99.3% | -19.2% | -66.7% |