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$ Value

$0

Shares

50,000

Price

$0

Filed

Dec 9

Insider

Name

Hacker Severin

Title

Chief Tech Officer, Co-Founder

CIK

0001870272

Roles

Director Officer 10% Owner

Transaction Details

Transaction Date

2025-12-08

Code

G

Table

Non-Derivative

Ownership

Direct

Equity Swap

No

Shares After

72

Footnotes

Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock in connection with: (i) any transfer, whether or not for value, except for certain permitted transfers further described in the Issuer's amended and restated certificate of incorporation, (ii) such time as the aggregate number of shares of Class B Common Stock outstanding ceases to represent 5% of the aggregate number of shares of Common Stock outstanding, and (iii) the death of the Reporting Person. | Shares held by SBH Trust dated March 10, 2020, of which Reporting Person is Trustee.

Filing Info

Accession No.

0001628280-25-056204

Form Type

4

Issuer CIK

0001562088

Hacker Severin's History

Date Ticker Type Value
2026-02-17 DUOL M $0
2026-02-17 DUOL M $0
2026-02-17 DUOL F $3.4M
2025-12-08 DUOL C $0
2025-12-08 DUOL G $0
2025-12-08 DUOL C $0
2025-12-03 DUOL M $0
2025-12-03 DUOL M $200K
2025-12-01 DUOL M $0
2025-12-01 DUOL M $0

Other Insiders at DUOL (90d)

Insider Bought Sold Last
Shelton James H $499K 2026-03-03
Munson Gillian
Chief Financial Officer
2026-03-25
von Ahn Luis
President & CEO, Co-Founder
2026-02-17
Meese Robert
Chief Business Officer
$110K 2026-02-17
Skaruppa Matthew
Chief Financial Officer
$658K 2026-02-18
Chen Stephen C.
General Counsel
$314K 2026-02-18
Hacker Severin
Chief Tech Officer, Co-Founder
2026-02-17
Glance Natalie
Chief Engineering Officer
$594K 2026-02-27