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For the fiscal year ended December 31, 2025

https://www.sec.gov/Archives/edgar/data/1562088/000162828026012494/duol-20251231.htm
Yes ☒ No ☐ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act

Registration No. 333-    ​

https://www.sec.gov/Archives/edgar/data/1801661/000110465921037435/tm218975-3_s1.htm
If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box

Registration No. 333-

https://www.sec.gov/Archives/edgar/data/1326801/000119312512034517/d287954ds1.htm
If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, check the following box: ¨ If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the