What happened
Duolingo, Inc. (NASDAQ: DUOL) said Ahn Luis von, its President & CEO, Co-Founder, director and 10% owner, sold 46,682 Class A shares on 2026-09-24. He is the reporting person on the filing.
The Form 4 was filed on 2026-09-28. It says the trades were made under a Rule 10b5-1 trading plan adopted on June 2, 2026. The shares traded from $150.45 to $152.29 per share, for about $7.03 million total. After the sale, Ahn Luis von held 0 direct Class A shares. Table II still lists stock option and Class B Common Stock entries, so the filing separates the sale from other reported interests.
Key numbers
| Metric | Latest | Change | Source |
|---|---|---|---|
| Shares sold | 46,682 shares | SEC Form 4 | |
| Total sale value | about $7.03 million | SEC Form 4 | |
| Sale price range | $150.45 to $152.29 per share | SEC Form 4 | |
| Direct shares held after the sale | 0 shares | SEC Form 4 | |
| Shares sold as a share of the holding before the trade | about 100.0% | Calculated from SEC Form 4 |
Why it matters
The filing also shows a fully vested and exercisable stock option with a $38.08 exercise price. It says each share of Class B Common Stock can convert into one share of Class A Common Stock at the holder's option. The Rule 10b5-1 plan matters because it points to a preplanned sale, not a fresh signal on Duolingo.
What's next
The key dates are 2026-09-24 for the trades and 2026-09-28 for the filing. That gives investors a baseline for any later ownership report from the same reporting person. If another Form 4 changes the direct Class A line or the Table II entries, it will be easier to see how much the stake has shifted.
Until then, this filing is the latest snapshot of Ahn Luis von's reported ownership changes. The direct sale, the plan disclosure and the remaining derivative entries together define the current reference point. A later filing will matter most if it shows a different mix of direct shares, option exposure or convertible Class B stock. Compared with this filing, that would be the clearest sign of a new position shift.
Sources
- SEC Form 4 — Form 4 filed 2026-09-28
Read the full OptimistFi thesis on Duolingo, Inc.: https://optimistfi.com/stocks/DUOL
See what would break the Duolingo, Inc. thesis and track it live on the OptimistFi Thesis-Break Engine.
Browse every company OptimistFi covers at optimistfi.com/stocks, or read the latest evidence-first research.
The full Duolingo, Inc. investment case, its status and the next test to watch live on the Duolingo, Inc. thesis page.
Originally published on OptimistFi, evidence-first equity research. More at optimistfi.com.
