Duolingo, Inc. SEC Filings

Duolingo (DUOL) insider activity: On 10/20/2025, President & CEO, Director, 10% owner and Co‑Founder Luis von Ahn reported multiple equity transactions. 120,000 performance‑based RSUs were settled into 120,000 shares of Class B common stock, then 120,000 Class B shares were converted into 120,000 Class A shares. To cover taxes, 51,768 Class A shares were withheld at $312.73 per share.

Following these transactions, the report lists 780,000 performance‑based RSUs beneficially owned and 3,218,403 shares of Class B common stock beneficially owned. Each Class B share is convertible into one Class A share and is subject to automatic conversion under specified conditions.

Duolingo, Inc. filed a Form 144 notice reporting a proposed sale of 1,000 shares of common stock through Morgan Stanley Smith Barney LLC on 10/08/2025. The filing shows an aggregate market value of $319,980, implying a per‑share market price near $319.98. The shares were originally issued as founders' shares acquired on 08/25/2011, and no other sales by the filer are reported in the past three months. The filing includes the usual representation that the seller is not aware of undisclosed material adverse information.

Duolingo insider Severin Hacker reported multiple transactions dated 10/06/2025. Mr. Hacker exercised a stock option to acquire 10,000 shares at an exercise price of $38.08 and simultaneously sold 10,000 Class A shares in multiple brokered trades under a Rule 10b5-1 plan at weighted average prices ranging from $316.79 to $329.19. After the activity his direct beneficial holdings of Class A common stock are reported as 72 shares, with additional direct and indirect holdings shown as exercised options and Class B/Class A shares, including 2,886,917 Class A shares held indirectly in a trust.

Duolingo, Inc. notice records a proposed sale of 40,000 common shares by an insider via Morgan Stanley Smith Barney, with an aggregate market value of $12,905,200 and an approximate sale date of 10/06/2025 on NASDAQ. The securities were acquired the same day by exercise of stock options and paid in cash. The filing also discloses six prior 10b5-1 plan sales by the same person, each for 10,000 shares between 07/07/2025 and 09/19/2025, producing gross proceeds ranging from $2,685,462 to $3,928,885. The signer represents they have no undisclosed material adverse information and, where applicable, relies on a written trading plan or instructions that satisfy Rule 10b5-1.

Natalie Glance, Chief Engineering Officer of Duolingo, Inc. (DUOL), reported multiple open-market sales of Class A common stock executed on 10/01/2025 pursuant to a Rule 10b5-1 trading plan adopted on 11/14/2024. The filings show nine sale entries totaling 3,283 shares sold at weighted-average prices reported in footnotes, with transaction price ranges between $303.45 and $320.21. Following these disposals, the reporting person directly beneficially owns 116,171 shares and indirectly owns 130 shares through a family member, for combined beneficial ownership of 116,301 shares.

Severin Hacker, Duolingo Chief Technology Officer and co-founder, reported option exercise and planned sales under a Rule 10b5-1 plan. The filing shows a $38.08 stock option exercised to acquire 10,000 shares on 09/19/2025. Those 10,000 shares were subsequently sold in multiple transactions under a 10b5-1 plan adopted September 11, 2024, for weighted-average prices reported in five separate sale groups ranging from about $286.26 to $291.15, generating aggregate sales of 10,000 shares. After the option exercise and sales, the reporting person shows 72 shares of Class A common stock directly owned and larger holdings of Class B and indirect holdings, including 2,886,917 Class A-equivalent shares held indirectly through the SBH Trust (Reporting Person is trustee).

Stephen C. Chen, General Counsel of Duolingo, Inc. (DUOL), exercised stock options to acquire 1,700 shares of Class A common stock on 09/18/2025 at an exercise price of $14.42 per share. The filing shows the option shares were fully vested and exercisable. After the reported transaction, Mr. Chen directly beneficially owned 34,338 shares of Class A common stock and held derivative securities covering 2,506 shares. The derivative line reflects that 1,700 option shares were acquired on the transaction date and that his total derivative holdings following the transaction are 2,506, with the newly acquired options exercisable through 03/10/2030.

Severin Hacker, Chief Tech Officer and Co‑Founder of Duolingo (DUOL), reported transactions on 09/05/2025. He exercised a fully vested option to buy 10,000 shares at $38.08 and contemporaneously sold 10,000 Class A shares across multiple transactions under a Rule 10b5‑1 trading plan adopted 09/11/2024 at weighted average prices in the mid‑$260s. After the reported trades, Mr. Hacker directly holds 72 Class A shares and 55,252 Class B shares (which are convertible into Class A); he also has indirect ownership of 2,886,917 Class A shares via the SBH Trust.

Duolingo General Counsel Stephen C. Chen reported a sale of Class A common stock. Mr. Chen sold 1,515 shares at $321.36 per share on 08/26/2025 under a Rule 10b5-1 trading plan adopted May 27, 2025. After the sale he beneficially owned 32,638 shares, reported in a Form 4 signed on 08/28/2025. The filing identifies Mr. Chen as an officer (General Counsel) and notes the transaction was executed pursuant to his pre-established trading plan.