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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 FORM 10 - K □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Commission File Number 001-37468 Delaware ( State of incorporation or organization ) AppFolio , Inc. ( Exact name of registrant as specified in its charter ) 50 Castilian Drive Santa Barbara , California ( Address of principal executive offices ) to Title of each class Class A common stock , par value $ 0.0001 per share ( 805 ) 364-6093 Registrant's telephone number , including area code Trading Symbol ( s ) . APPF 26-0359894 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( b ) of the Exchange Act : 93117 ( Zip Code ) Name of exchange on which registered The NASDAQ Stock Market LLC Securities registered pursuant to Section 12 ( g ) of the Exchange Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . 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 . Yes No