X0609 4 2026-08-06 0001433195 APPFOLIO INC APPF 0000938333 DUCA MAURICE J false C/O IGSB, INC. 1485 E. VALLEY ROAD, SUITE H SANTA BARBARA CA 93108 false false true false 1 Class A Common Stock 2026-08-06 4 S 0 120 189.49 D 59542 D Class A Common Stock 2026-08-06 4 S 0 339 190.40 D 59203 D Class A Common Stock 2026-08-06 4 S 0 229 191.88 D 58974 D Class A Common Stock 2026-08-06 4 S 0 1429 193.18 D 57545 D Class A Common Stock 2026-08-06 4 S 0 1383 194.06 D 56162 D Class A Common Stock 2026-08-06 4 S 0 54 189.49 D 25770 I By Family Trust Class A Common Stock 2026-08-06 4 S 0 155 190.40 D 25615 I By Family Trust Class A Common Stock 2026-08-06 4 S 0 105 191.89 D 25510 I By Family Trust Class A Common Stock 2026-08-06 4 S 0 655 193.18 D 24855 I By Family Trust Class A Common Stock 2026-08-06 4 S 0 631 194.06 D 24224 I By Family Trust Class A Common Stock 2026-08-06 4 S 0 193 189.49 D 95339 I By Pension Trust Class A Common Stock 2026-08-06 4 S 0 539 190.40 D 94800 I By Pension Trust Class A Common Stock 2026-08-06 4 S 0 365 191.88 D 94435 I By Pension Trust Class A Common Stock 2026-08-06 4 S 0 2082 193.14 D 92353 I By Pension Trust Class A Common Stock 2026-08-06 4 S 0 2421 194.02 D 89932 I By Pension Trust Class A Common Stock 2026-08-07 4 S 0 431 195.61 D 55731 D Class A Common Stock 2026-08-07 4 S 0 552 196.32 D 55179 D Class A Common Stock 2026-08-07 4 S 0 650 197.46 D 54529 D Class A Common Stock 2026-08-07 4 S 0 784 198.62 D 53745 D Class A Common Stock 2026-08-07 4 S 0 493 199.41 D 53252 D Class A Common Stock 2026-08-07 4 S 0 130 200.56 D 53122 D Class A Common Stock 2026-08-07 4 S 0 229 201.37 D 52893 D Class A Common Stock 2026-08-07 4 S 0 165 202.47 D 52728 D Class A Common Stock 2026-08-07 4 S 0 66 203.55 D 52662 D Class A Common Stock 2026-08-07 4 S 0 196 195.61 D 24028 I By Family Trust Class A Common Stock 2026-08-07 4 S 0 253 196.32 D 23775 I By Family Trust Class A Common Stock 2026-08-07 4 S 0 298 197.46 D 23477 I By Family Trust Class A Common Stock 2026-08-07 4 S 0 359 198.62 D 23118 I By Family Trust Class A Common Stock 2026-08-07 4 S 0 225 199.41 D 22893 I By Family Trust Class A Common Stock 2026-08-07 4 S 0 60 200.56 D 22833 I By Family Trust Sales made pursuant to a 10b5-1 trading plan previously adopted by the Reporting Person on March 13, 2026. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $188.91 to $189.88, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $190.00 to $190.865, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $191.52 to $192.51, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $192.62 to $193.61, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $193.67 to $194.42, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $188.91 to $189.89, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. These shares of Class A Common Stock ("Class A Shares") are held by a pension trust of which the Reporting Person is the sole trustee and who, in that capacity, possesses sole voting and sole dispositive power over these Class A Shares. However, the Reporting Person does not possess any pecuniary interest in these Class A Shares. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $192.53 to $193.52, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $193.54 to $194.42, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $194.94 to $195.93, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $195.96 to $196.91, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $196.995 to $197.90, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $198.00 to $198.88, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $199.03 to $199.98, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $200.12 to $200.81, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $201.12 to $201.92, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $202.20 to $202.97, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This price reflects the weighted average price at which these shares were sold. The shares were sold in multiple transactions at prices ranging from $203.34 to $203.75, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Due to a 30 line-item limitation in Table I, this is the first of two Forms 4 filed by the Reporting Person on August 10, 2026. /s/ Kimberly Shea, Attorney-in-Fact for Maurice J. Duca 2026-08-10