Duolingo, Inc.

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Submission of Matters to a Vote of Security Holders

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Annual Report Scanned (Paper)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Results of Operations and Financial Condition

No description available

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

5.02

5.07

Additional Information for Proxy Statement/ Votes

2.02,9.01

General form for quarterly reports under Section 13 or 15(d)

2.02,5.02,9.01

Annual Report Scanned (Paper)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

1.01,2.03

Annual report pursuant to Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

2.02,9.01

1.01,2.03

5.03,9.01

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

5.07

General form for quarterly reports under Section 13 or 15(d)

Annual Report Scanned (Paper)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual report pursuant to Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Prospectus Supplement with Pricing Information

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

No description available

Notice of Effectiveness

Amended Initial Registration Statement

Correspondence with the SEC

Correspondence with the SEC

Registration of Securities on Exchange

Correspondence with the SEC

Amended Initial Registration Statement

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Registration (IPO) statement under Securities Act of 1933

Letter from the SEC

No description available

No description available

Letter from the SEC

No description available

06b

06b

06b

06b

Rule 506

Skaruppa Matthew

Glance Natalie

Chen Stephen C.

Hacker Severin

Meese Robert

von Ahn Luis

Skaruppa Matthew

Glance Natalie

Chen Stephen C.

Skaruppa Matthew

Glance Natalie

Chen Stephen C.

Meese Robert

Chen Stephen C.

Schlosser Mario

Ross Bonnie

Severin Hacker Foundation

Glance Natalie

Hacker Severin

von Ahn Luis