Stephen C. Chen
Insider
First SEC filing: July 27, 2021 · Latest: June 18, 2026
Insider at
Insider transactions
0 buys (P)
16 sells (S)
Net: $-2,462,510
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 14, 2026 | DUOL | S 10b5-1 | 2,107 | $147.43 | $310,635 | 49,734 Direct | -4.06% | Disposed | -2.1% (price as of 2026-10-02) |
| Sept. 14, 2026 | DUOL | S 10b5-1 | 5,965 | $150.00 | $894,750 | 43,769 Direct | -11.99% | Disposed | -3.8% (price as of 2026-10-02) |
| Aug. 17, 2026 | DUOL | S | 1,024 | $129.13 | $132,229 | 51,841 Direct | -1.94% | Disposed | 11.7% (price as of 2026-10-02) |
| June 17, 2026 | DUOL | M | 58 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| June 17, 2026 | DUOL | M | 58 | $14.42 | $836 | 52,865 Direct | +0.11% | Acquired | 900.5% (price as of 2026-10-02) |
| May 18, 2026 | DUOL | S 10b5-1 | 1,277 | $113.27 | $144,646 | 53,507 Direct | -2.33% | Disposed | 27.4% (price as of 2026-10-02) |
| May 18, 2026 | DUOL | S 10b5-1 | 700 | $114.22 | $79,954 | 52,807 Direct | -1.31% | Disposed | 26.3% (price as of 2026-10-02) |
| May 15, 2026 | DUOL | A | 24,411 | $112.06 | $2,735,497 | 55,604 Direct | +78.26% | Acquired | 28.7% (price as of 2026-10-02) |
| May 15, 2026 | DUOL | S 10b5-1 | 820 | $112.16 | $91,971 | 54,784 Direct | -1.47% | Disposed | 28.6% (price as of 2026-10-02) |
| May 12, 2026 | DUOL | M | 648 | $14.42 | $9,344 | 31,193 Direct | +2.12% | Acquired | 900.5% (price as of 2026-10-02) |
| May 12, 2026 | DUOL | M | 648 | · | · | 58 Direct | -91.78% | Disposed | (price as of 2026-10-02) |
| Feb. 18, 2026 | DUOL | S 10b5-1 | 821 | $111.83 | $91,812 | 31,625 Direct | -2.53% | Disposed | 29.0% (price as of 2026-10-02) |
| Feb. 18, 2026 | DUOL | S 10b5-1 | 480 | $113.95 | $54,696 | 31,145 Direct | -1.52% | Disposed | 26.6% (price as of 2026-10-02) |
| Feb. 18, 2026 | DUOL | S 10b5-1 | 520 | $114.55 | $59,566 | 30,625 Direct | -1.67% | Disposed | 25.9% (price as of 2026-10-02) |
| Feb. 18, 2026 | DUOL | S 10b5-1 | 80 | $115.47 | $9,238 | 30,545 Direct | -0.26% | Disposed | 24.9% (price as of 2026-10-02) |
| Feb. 17, 2026 | DUOL | S | 896 | $110.06 | $98,614 | 32,446 Direct | -2.69% | Disposed | 31.1% (price as of 2026-10-02) |
| Dec. 29, 2025 | DUOL | M | 1,800 | $14.42 | $25,956 | 33,342 Direct | +5.71% | Acquired | 900.5% (price as of 2026-10-02) |
| Dec. 29, 2025 | DUOL | M | 1,800 | · | · | 706 Direct | -71.83% | Disposed | (price as of 2026-10-02) |
| Nov. 18, 2025 | DUOL | S 10b5-1 | 120 | $173.97 | $20,876 | 32,936 Direct | -0.36% | Disposed | -17.1% (price as of 2026-10-02) |
| Nov. 18, 2025 | DUOL | S 10b5-1 | 594 | $175.15 | $104,039 | 32,342 Direct | -1.80% | Disposed | -17.6% (price as of 2026-10-02) |
| Nov. 18, 2025 | DUOL | S 10b5-1 | 320 | $175.94 | $56,301 | 32,022 Direct | -0.99% | Disposed | -18.0% (price as of 2026-10-02) |
| Nov. 18, 2025 | DUOL | S 10b5-1 | 480 | $177.19 | $85,051 | 31,542 Direct | -1.50% | Disposed | -18.6% (price as of 2026-10-02) |
| Nov. 17, 2025 | DUOL | S | 1,282 | $177.95 | $228,132 | 33,056 Direct | -3.73% | Disposed | -18.9% (price as of 2026-10-02) |
| Sept. 18, 2025 | DUOL | M | 1,700 | $14.42 | $24,514 | 34,338 Direct | +5.21% | Acquired | 900.5% (price as of 2026-10-02) |
| Sept. 18, 2025 | DUOL | M | 1,700 | · | · | 2,506 Direct | -40.42% | Disposed | (price as of 2026-10-02) |
| Aug. 26, 2025 | DUOL | S 10b5-1 | 1,515 | $321.36 | $486,860 | 32,638 Direct | -4.44% | Disposed | -55.1% (price as of 2026-10-02) |
| Aug. 15, 2025 | DUOL | S | 1,282 | $329.03 | $421,816 | 34,153 Direct | -3.62% | Disposed | -56.2% (price as of 2026-10-02) |
| Aug. 15, 2025 | DUOL | G | 750 | · | · | 35,435 Direct | -2.07% | Disposed | (price as of 2026-10-02) |
| May 16, 2025 | DUOL | S 10b5-1 | 1,268 | $525.07 | $665,789 | 37,552 Direct | -3.27% | Disposed | -72.5% (price as of 2026-10-02) |
| May 16, 2025 | DUOL | S 10b5-1 | 300 | $526.44 | $157,932 | 37,252 Direct | -0.80% | Disposed | -72.6% (price as of 2026-10-02) |
| May 16, 2025 | DUOL | S 10b5-1 | 300 | $527.61 | $158,283 | 36,952 Direct | -0.81% | Disposed | -72.7% (price as of 2026-10-02) |
| May 16, 2025 | DUOL | S 10b5-1 | 467 | $529.25 | $247,160 | 36,485 Direct | -1.26% | Disposed | -72.7% (price as of 2026-10-02) |
| May 16, 2025 | DUOL | S 10b5-1 | 100 | $530.22 | $53,022 | 36,385 Direct | -0.27% | Disposed | -72.8% (price as of 2026-10-02) |
| May 16, 2025 | DUOL | S 10b5-1 | 200 | $531.43 | $106,286 | 36,185 Direct | -0.55% | Disposed | -72.9% (price as of 2026-10-02) |
| May 15, 2025 | DUOL | A | 5,443 | · | · | 40,077 Direct | +15.72% | Acquired | (price as of 2026-10-02) |
| May 15, 2025 | DUOL | S | 1,257 | $531.71 | $668,359 | 38,820 Direct | -3.14% | Disposed | -72.9% (price as of 2026-10-02) |
| Feb. 18, 2025 | DUOL | S 10b5-1 | 1,166 | $435.00 | $507,210 | 35,532 Direct | -3.18% | Disposed | -66.8% (price as of 2026-10-02) |
| Feb. 18, 2025 | DUOL | S | 898 | $435.28 | $390,881 | 34,634 Direct | -2.53% | Disposed | -66.9% (price as of 2026-10-02) |
| Feb. 6, 2025 | DUOL | M | 1,331 | $14.42 | $19,193 | 36,698 Direct | +3.76% | Acquired | 900.5% (price as of 2026-10-02) |
| Feb. 6, 2025 | DUOL | M | 1,331 | · | · | 4,206 Direct | -24.04% | Disposed | (price as of 2026-10-02) |
| Dec. 19, 2024 | DUOL | M | 3,700 | $14.42 | $53,354 | 35,367 Direct | +11.68% | Acquired | 900.5% (price as of 2026-10-02) |
| Dec. 19, 2024 | DUOL | M | 3,700 | · | · | 5,537 Direct | -40.06% | Disposed | (price as of 2026-10-02) |
| Nov. 18, 2024 | DUOL | S 10b5-1 | 275 | $307.04 | $84,436 | 34,034 Direct | -0.80% | Disposed | -53.0% (price as of 2026-10-02) |
| Nov. 18, 2024 | DUOL | S 10b5-1 | 1,767 | $307.95 | $544,148 | 32,267 Direct | -5.19% | Disposed | -53.2% (price as of 2026-10-02) |
| Nov. 18, 2024 | DUOL | S 10b5-1 | 400 | $309.87 | $123,948 | 31,867 Direct | -1.24% | Disposed | -53.4% (price as of 2026-10-02) |
| Nov. 18, 2024 | DUOL | S 10b5-1 | 200 | $312.19 | $62,438 | 31,667 Direct | -0.63% | Disposed | -53.8% (price as of 2026-10-02) |
| Nov. 15, 2024 | DUOL | S | 1,249 | $309.30 | $386,316 | 34,309 Direct | -3.51% | Disposed | -53.4% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | M | 7,382 | $14.42 | $106,448 | 55,022 Direct | +15.50% | Acquired | 900.5% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | S 10b5-1 | 1,363 | $208.53 | $284,226 | 53,659 Direct | -2.48% | Disposed | -30.8% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | S 10b5-1 | 3,173 | $209.54 | $664,870 | 50,486 Direct | -5.91% | Disposed | -31.1% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | S 10b5-1 | 2,815 | $210.62 | $592,895 | 47,671 Direct | -5.58% | Disposed | -31.5% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | S 10b5-1 | 2,977 | $211.62 | $629,993 | 44,694 Direct | -6.24% | Disposed | -31.8% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | S 10b5-1 | 5,677 | $212.69 | $1,207,441 | 39,017 Direct | -12.70% | Disposed | -32.2% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | S 10b5-1 | 3,459 | $213.42 | $738,220 | 35,558 Direct | -8.87% | Disposed | -32.4% (price as of 2026-10-02) |
| Aug. 30, 2024 | DUOL | M | 7,382 | · | · | 9,237 Direct | -44.42% | Disposed | (price as of 2026-10-02) |
| Aug. 15, 2024 | DUOL | S | 1,249 | $199.50 | $249,176 | 47,640 Direct | -2.55% | Disposed | -27.7% (price as of 2026-10-02) |
| June 28, 2024 | DUOL | M | 6,715 | $14.42 | $96,830 | 48,889 Direct | +15.92% | Acquired | 900.5% (price as of 2026-10-02) |
| June 28, 2024 | DUOL | M | 6,715 | · | · | 16,619 Direct | -28.78% | Disposed | (price as of 2026-10-02) |
| May 15, 2024 | DUOL | S | 988 | · | · | 33,057 Direct | -2.90% | Disposed | (price as of 2026-10-02) |
| May 15, 2024 | DUOL | A | 9,117 | · | · | 42,174 Direct | +27.58% | Acquired | (price as of 2026-10-02) |
| Feb. 15, 2024 | DUOL | S | 988 | · | · | 34,045 Direct | -2.82% | Disposed | (price as of 2026-10-02) |
| Feb. 9, 2024 | DUOL | M | 2,000 | $14.42 | $28,840 | 37,033 Direct | +5.71% | Acquired | 900.5% (price as of 2026-10-02) |
| Feb. 9, 2024 | DUOL | S 10b5-1 | 2,000 | $190.00 | $380,000 | 35,033 Direct | -5.40% | Disposed | -24.1% (price as of 2026-10-02) |
| Feb. 9, 2024 | DUOL | M | 2,000 | · | · | 23,334 Direct | -7.89% | Disposed | (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | M | 18,000 | $14.42 | $259,560 | 53,033 Direct | +51.38% | Acquired | 900.5% (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | S 10b5-1 | 5,396 | $205.20 | $1,107,259 | 47,637 Direct | -10.17% | Disposed | -29.7% (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | S 10b5-1 | 3,840 | $205.98 | $790,963 | 43,797 Direct | -8.06% | Disposed | -30.0% (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | S 10b5-1 | 1,586 | $207.19 | $328,603 | 42,211 Direct | -3.62% | Disposed | -30.4% (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | S 10b5-1 | 4,722 | $208.17 | $982,979 | 37,489 Direct | -11.19% | Disposed | -30.7% (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | S 10b5-1 | 2,091 | $209.01 | $437,040 | 35,398 Direct | -5.58% | Disposed | -31.0% (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | S 10b5-1 | 365 | $210.29 | $76,756 | 35,033 Direct | -1.03% | Disposed | -31.4% (price as of 2026-10-02) |
| Jan. 4, 2024 | DUOL | M | 18,000 | · | · | 25,334 Direct | -41.54% | Disposed | (price as of 2026-10-02) |
| Nov. 15, 2023 | DUOL | S | 988 | $209.78 | $207,263 | 35,033 Direct | -2.74% | Disposed | -31.2% (price as of 2026-10-02) |
| Sept. 11, 2023 | DUOL | M | 8,842 | $14.42 | $127,502 | 44,863 Direct | +24.55% | Acquired | 900.5% (price as of 2026-10-02) |
| Sept. 11, 2023 | DUOL | S 10b5-1 | 8,742 | $160.38 | $1,402,042 | 36,121 Direct | -19.49% | Disposed | -10.0% (price as of 2026-10-02) |
| Sept. 11, 2023 | DUOL | S 10b5-1 | 100 | $161.00 | $16,100 | 36,021 Direct | -0.28% | Disposed | -10.4% (price as of 2026-10-02) |
| Sept. 11, 2023 | DUOL | M | 8,842 | · | · | 43,334 Direct | -16.95% | Disposed | (price as of 2026-10-02) |
| Sept. 8, 2023 | DUOL | M | 5,325 | $14.42 | $76,786 | 41,346 Direct | +14.78% | Acquired | 900.5% (price as of 2026-10-02) |
| Sept. 8, 2023 | DUOL | S 10b5-1 | 5,325 | $160.08 | $852,426 | 36,021 Direct | -12.88% | Disposed | -9.9% (price as of 2026-10-02) |
| Sept. 8, 2023 | DUOL | M | 5,325 | · | · | 52,176 Direct | -9.26% | Disposed | (price as of 2026-10-02) |
| Aug. 15, 2023 | DUOL | S | 988 | $132.44 | $130,851 | 36,021 Direct | -2.67% | Disposed | 8.9% (price as of 2026-10-02) |
| May 15, 2023 | DUOL | A | 11,125 | · | · | 37,009 Direct | +42.98% | Acquired | (price as of 2026-10-02) |
| May 15, 2023 | DUOL | S | 669 | $140.83 | $94,215 | 25,884 Direct | -2.52% | Disposed | 2.4% (price as of 2026-10-02) |
| March 21, 2023 | DUOL | M | 9,252 | $14.42 | $133,414 | 35,805 Direct | +34.84% | Acquired | 900.5% (price as of 2026-10-02) |
| March 21, 2023 | DUOL | S 10b5-1 | 9,252 | $130.43 | $1,206,738 | 26,553 Direct | -25.84% | Disposed | 10.6% (price as of 2026-10-02) |
| March 21, 2023 | DUOL | M | 9,252 | · | · | 57,501 Direct | -13.86% | Disposed | (price as of 2026-10-02) |
| March 7, 2023 | DUOL | M | 10,748 | $14.42 | $154,986 | 37,301 Direct | +40.48% | Acquired | 900.5% (price as of 2026-10-02) |
| March 7, 2023 | DUOL | S 10b5-1 | 10,748 | $130.10 | $1,398,315 | 26,553 Direct | -28.81% | Disposed | 10.9% (price as of 2026-10-02) |
| March 7, 2023 | DUOL | M | 10,748 | · | · | 66,753 Direct | -13.87% | Disposed | (price as of 2026-10-02) |
| Feb. 15, 2023 | DUOL | S | 484 | $96.94 | $46,919 | 26,553 Direct | -1.79% | Disposed | 48.8% (price as of 2026-10-02) |
| Nov. 15, 2022 | DUOL | S | 674 | $74.31 | $50,085 | 27,037 Direct | -2.43% | Disposed | 94.1% (price as of 2026-10-02) |
| Aug. 15, 2022 | DUOL | S | 673 | $106.37 | $71,587 | 27,711 Direct | -2.37% | Disposed | 35.6% (price as of 2026-10-02) |
| June 24, 2022 | DUOL | M | 25,358 | $14.42 | $365,662 | 53,742 Direct | +89.34% | Acquired | 900.5% (price as of 2026-10-02) |
| June 24, 2022 | DUOL | S 10b5-1 | 7,348 | $102.57 | $753,684 | 46,394 Direct | -13.67% | Disposed | 40.7% (price as of 2026-10-02) |
| June 24, 2022 | DUOL | S 10b5-1 | 10,712 | $103.42 | $1,107,835 | 35,682 Direct | -23.09% | Disposed | 39.5% (price as of 2026-10-02) |
| June 24, 2022 | DUOL | S 10b5-1 | 6,201 | $104.50 | $648,004 | 29,481 Direct | -17.38% | Disposed | 38.1% (price as of 2026-10-02) |
| June 24, 2022 | DUOL | S 10b5-1 | 1,097 | $105.39 | $115,613 | 28,384 Direct | -3.72% | Disposed | 36.9% (price as of 2026-10-02) |
| June 24, 2022 | DUOL | M | 25,358 | · | · | 77,501 Direct | -24.65% | Disposed | (price as of 2026-10-02) |
| June 21, 2022 | DUOL | M | 10,535 | $14.42 | $151,915 | 38,919 Direct | +37.12% | Acquired | 900.5% (price as of 2026-10-02) |
| June 21, 2022 | DUOL | S 10b5-1 | 10,535 | $102.14 | $1,076,045 | 28,384 Direct | -27.07% | Disposed | 41.2% (price as of 2026-10-02) |
Showing latest 100 of 144 transactions
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| June 17, 2026 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 58 | Disposed |
| May 12, 2026 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 648 | Disposed |
| Dec. 29, 2025 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 1,800 | Disposed |
| Sept. 18, 2025 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 1,700 | Disposed |
| Feb. 6, 2025 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 1,331 | Disposed |
| Dec. 19, 2024 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 3,700 | Disposed |
| Aug. 30, 2024 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 7,382 | Disposed |
| June 28, 2024 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 6,715 | Disposed |
| Feb. 9, 2024 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 2,000 | Disposed |
| Jan. 4, 2024 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 18,000 | Disposed |
| Sept. 11, 2023 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 8,842 | Disposed |
| Sept. 8, 2023 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 5,325 | Disposed |
| March 21, 2023 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 9,252 | Disposed |
| March 7, 2023 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 10,748 | Disposed |
| June 24, 2022 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 25,358 | Disposed |
| June 21, 2022 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 10,535 | Disposed |
| June 9, 2022 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 100 | Disposed |
| June 8, 2022 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 4,007 | Disposed |
| Feb. 28, 2022 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 5,000 | Disposed |
| Nov. 15, 2021 | DUOL | Restricted Stock Units | Class A Common Stock | · | · | 544 | Disposed |
| Nov. 15, 2021 | DUOL | Stock Option (Right to Buy) | Class A Common Stock | $14.42 | March 10, 2030 | 17,499 | Disposed |
| Aug. 15, 2021 | DUOL | Restricted Stock Units | Class A Common Stock | · | · | 544 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| July 27, 2021 | DUOL | Stock Option (Right to Buy) | 140,000 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $587,500 | · | $2,887,620 | · | · | · | $17,500 | $3,492,620 |
| 2024 | $553,333 | · | $1,616,444 | · | · | · | $17,250 | $2,187,028 |
| 2023 | $513,333 | · | $1,591,876 | · | · | · | $16,500 | $2,121,709 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.