Chen Stephen C.

Officer · DUOL

As of 2026-09-16, Chen Stephen C. has 42 Form 4 transactions on record across 1 company — 23 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Pattern in the record: open-market sales filed in August in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $6.5MIndirect: $0$6.5Mas of 2026-09-16
  • Direct $6.5M
  • Indirect $0
DUOLdirect43,769 sh$6.5M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

DUOL · 42 trades
2026-09-14: Sale, 5,965 sh ($895K)2026-09-14: Sale, 2,107 sh ($311K)2026-08-17: Sale, 1,024 sh ($132K)2026-06-17: Option exercise, 58 sh ($836)2026-06-17: Option exercise, 58 sh ($0)2026-05-18: Sale, 1,277 sh ($145K)2026-05-18: Sale, 700 sh ($80K)2026-05-15: Award / grant, 24,411 sh ($2.7M)2026-05-15: Sale, 820 sh ($92K)2026-05-12: Option exercise, 648 sh ($9K)2026-05-12: Option exercise, 648 sh ($0)2026-02-18: Sale, 821 sh ($92K)2026-02-18: Sale, 520 sh ($60K)2026-02-18: Sale, 480 sh ($55K)2026-02-18: Sale, 80 sh ($9K)2026-02-17: Sale, 896 sh ($99K)2025-12-29: Option exercise, 1,800 sh ($26K)2025-12-29: Option exercise, 1,800 sh ($0)2025-11-18: Sale, 594 sh ($104K)2025-11-18: Sale, 480 sh ($85K)2025-11-18: Sale, 320 sh ($56K)2025-11-18: Sale, 120 sh ($21K)2025-11-17: Sale, 1,282 sh ($228K)2025-09-18: Option exercise, 1,700 sh ($25K)2025-09-18: Option exercise, 1,700 sh ($0)2025-08-26: Sale, 1,515 sh ($487K)2025-08-15: Sale, 1,282 sh ($422K)2025-08-15: Gift, 750 sh ($0)2025-05-16: Sale, 1,268 sh ($666K)2025-05-16: Sale, 467 sh ($247K)2025-05-16: Sale, 300 sh ($158K)2025-05-16: Sale, 300 sh ($158K)2025-05-16: Sale, 200 sh ($106K)2025-05-16: Sale, 100 sh ($53K)2025-05-15: Sale, 1,257 sh ($668K)2025-05-15: Award / grant, 5,443 sh ($0)2025-02-18: Sale, 1,166 sh ($507K)2025-02-18: Sale, 898 sh ($391K)2025-02-06: Option exercise, 1,331 sh ($19K)2025-02-06: Option exercise, 1,331 sh ($0)2024-12-19: Option exercise, 3,700 sh ($53K)2024-12-19: Option exercise, 3,700 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-09-14DUOLSale5,965 @ $150.00$895K−12.0% of holding43,769Form 4
2026-09-14DUOLSale2,107 @ $147.43$311K−4.1% of holding49,734Form 4
2026-08-17DUOLSale1,024 @ $129.13$132K−1.9% of holding51,841Form 4
2026-05-18DUOLSale1,277 @ $113.27$145K−2.3% of holding53,507Form 4
2026-05-18DUOLSale700 @ $114.22$80K−1.3% of holding52,807Form 4
2026-05-15DUOLSale820 @ $112.16$92K−1.5% of holding54,784Form 4
2026-02-18DUOLSale821 @ $111.83$92K−2.5% of holding31,625Form 4
2026-02-18DUOLSale520 @ $114.55$60K−1.7% of holding30,625Form 4
2026-02-18DUOLSale480 @ $113.95$55K−1.5% of holding31,145Form 4
2026-02-18DUOLSale80 @ $115.47$9K−0.3% of holding30,545Form 4
2026-02-17DUOLSale896 @ $110.06$99K−2.7% of holding32,446Form 4
2025-11-18DUOLSale594 @ $175.15$104K−1.8% of holding32,342Form 4
2025-11-18DUOLSale480 @ $177.19$85K−1.5% of holding31,542Form 4
2025-11-18DUOLSale320 @ $175.94$56K−1.0% of holding32,022Form 4
2025-11-18DUOLSale120 @ $173.97$21K−0.4% of holding32,936Form 4
2025-11-17DUOLSale1,282 @ $177.95$228K−3.7% of holding33,056Form 4
2025-08-26DUOLSale1,515 @ $321.36$487K−4.4% of holding32,638Form 4
2025-08-15DUOLSale1,282 @ $329.03$422K−3.6% of holding34,153Form 4
2025-05-16DUOLSale1,268 @ $525.07$666K−3.3% of holding37,552Form 4
2025-05-16DUOLSale467 @ $529.25$247K−1.3% of holding36,485Form 4
2025-05-16DUOLSale300 @ $527.61$158K−0.8% of holding36,952Form 4
2025-05-16DUOLSale300 @ $526.44$158K−0.8% of holding37,252Form 4
2025-05-16DUOLSale200 @ $531.43$106K−0.5% of holding36,185Form 4
2025-05-16DUOLSale100 @ $530.22$53K−0.3% of holding36,385Form 4
2025-05-15DUOLSale1,257 @ $531.71$668K−3.1% of holding38,820Form 4
2025-02-18DUOLSale1,166 @ $435.00$507K−3.2% of holding35,532Form 4
2025-02-18DUOLSale898 @ $435.28$391K−2.5% of holding34,634Form 4
15 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-06-17DUOLOption exercise5852,865Form 4
2026-06-17DUOLOption exercise580Form 4
2026-05-15DUOLAward / grant24,41155,604Form 4
2026-05-12DUOLOption exercise64831,193Form 4
2026-05-12DUOLOption exercise64858Form 4
2025-12-29DUOLOption exercise1,80033,342Form 4
2025-12-29DUOLOption exercise1,800706Form 4
2025-09-18DUOLOption exercise1,70034,338Form 4
2025-09-18DUOLOption exercise1,7002,506Form 4
2025-08-15DUOLGift75035,435Form 4
2025-05-15DUOLAward / grant5,44340,077Form 4
2025-02-06DUOLOption exercise1,33136,698Form 4
2025-02-06DUOLOption exercise1,3314,206Form 4
2024-12-19DUOLOption exercise3,70035,367Form 4
2024-12-19DUOLOption exercise3,7005,537Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.