Stephen C. Chen is CLO at Duolingo, Inc. (DUOL). They have made 20 open-market trades across 1 company since 2021, most recently 2026-09-14.
CIK 0001869758
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 20 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| DUOL | 43,769 | $7.0M |
Shares reported on the most recent Form 4, priced at the 2026-09-15 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| DUOL | SELL · 10b5-1 | 2026-09-14 | 2026-09-15 | $149.33 | $1.2M | -4.3% | -0.7% | — |
| DUOL | SELL | 2026-08-17 | 2026-08-19 | $129.13 | $132K | +2.3% | -2.2% | — |
| DUOL | SELL · 10b5-1 | 2026-05-15 | 2026-05-19 | $113.18 | $317K | +8.4% | +15.5% | +19.6% |
| DUOL | SELL | 2026-02-17 | 2026-02-20 | $112.24 | $314K | -14.4% | -11.2% | -6.1% |
| DUOL | SELL · 10b5-1 | 2025-11-17 | 2025-11-19 | $176.89 | $968K | +3.7% | +5.6% | -36.4% |
| DUOL | SELL · 10b5-1 | 2025-08-26 | 2025-08-28 | $321.36 | $974K | -10.6% | +2.8% | -41.1% |
| DUOL | SELL | 2025-08-15 | 2025-08-18 | $329.03 | $844K | -12.1% | -23.9% | -51.4% |
| DUOL | SELL · 10b5-1 | 2025-05-16 | 2025-05-19 | $526.83 | $2.6M | +0.4% | -7.5% | -28.7% |
| DUOL | SELL | 2025-05-15 | 2025-05-16 | $531.71 | $1.3M | -0.8% | -8.3% | -36.3% |
| DUOL | SELL · 10b5-1 | 2025-02-18 | 2025-02-19 | $435.17 | $1.3M | -31.4% | -28.1% | +22.1% |
| DUOL | SELL · 10b5-1 | 2024-11-18 | 2024-11-20 | $308.26 | $1.4M | +6.8% | +1.2% | +30.5% |
| DUOL | SELL | 2024-11-15 | 2024-11-18 | $309.30 | $773K | +14.8% | +9.7% | +45.5% |
| DUOL | SELL · 10b5-1 | 2024-08-30 | 2024-09-03 | $211.55 | $8.2M | +13.0% | +40.1% | +71.2% |
| DUOL | SELL | 2024-08-15 | 2024-08-16 | $199.50 | $498K | +0.5% | +16.0% | +59.9% |
| DUOL | SELL · 10b5-1 | 2024-02-09 | 2024-02-12 | $190.00 | $380K | -2.8% | +23.8% | -0.6% |
| DUOL | SELL · 10b5-1 | 2024-01-04 | 2024-01-05 | $206.87 | $7.4M | -2.1% | -12.6% | +6.0% |
| DUOL | SELL | 2023-11-15 | 2023-11-16 | $209.78 | $415K | +5.3% | +15.2% | -9.1% |
| DUOL | SELL · 10b5-1 | 2023-09-08 | 2023-09-12 | $160.27 | $4.5M | -4.9% | +9.1% | +34.7% |
| DUOL | SELL | 2023-08-15 | 2023-08-17 | $132.44 | $262K | +17.1% | +33.5% | +66.1% |
| DUOL | SELL | 2023-05-15 | 2023-05-16 | $140.83 | $188K | +4.3% | +10.0% | -3.9% |
| DUOL | SELL · 10b5-1 | 2023-03-21 | 2023-03-22 | $130.43 | $2.4M | +3.6% | +2.0% | +8.8% |
| DUOL | SELL | 2023-03-07 | 2023-03-08 | $130.10 | $2.8M | +2.9% | +7.1% | +32.8% |
| DUOL | SELL | 2023-02-15 | 2023-02-17 | $96.94 | $47K | +33.2% | +43.8% | +68.7% |
| DUOL | SELL | 2022-11-15 | 2022-11-17 | $74.31 | $100K | -2.0% | +1.3% | +37.3% |
| DUOL | SELL | 2022-08-15 | 2022-08-17 | $106.37 | $143K | -9.0% | -2.5% | -27.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.