X0609 4 2026-08-20 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 2026-08-20 4 S 0 178 215.37 D 9646 I By Family Trust Class A Common Stock 2026-08-20 4 S 0 198 216.44 D 9448 I By Family Trust Class A Common Stock 2026-08-20 4 S 0 452 217.68 D 8996 I By Family Trust Class A Common Stock 2026-08-20 4 S 0 551 218.46 D 8445 I By Family Trust Class A Common Stock 2026-08-20 4 S 0 199 219.35 D 8246 I By Family Trust Class A Common Stock 2026-08-20 4 S 0 22 220.06 D 8224 I By Family Trust Class A Common Stock 2026-08-20 4 S 0 622 215.37 D 38910 I By Pension Trust Class A Common Stock 2026-08-20 4 S 0 702 216.43 D 38208 I By Pension Trust Class A Common Stock 2026-08-20 4 S 0 1550 217.67 D 36658 I By Pension Trust Class A Common Stock 2026-08-20 4 S 0 1947 218.45 D 34711 I By Pension Trust Class A Common Stock 2026-08-20 4 S 0 701 219.35 D 34010 I By Pension Trust Class A Common Stock 2026-08-20 4 S 0 78 220.06 D 33932 I By Pension Trust Class A Common Stock 2026-08-21 4 S 0 8 214.71 D 8216 I By Family Trust Class A Common Stock 2026-08-21 4 S 0 17 216.38 D 8199 I By Family Trust Class A Common Stock 2026-08-21 4 S 0 8 218.14 D 8191 I By Family Trust Class A Common Stock 2026-08-21 4 S 0 35 221.41 D 8156 I By Family Trust Class A Common Stock 2026-08-21 4 S 0 94 222.42 D 8062 I By Family Trust Class A Common Stock 2026-08-21 4 S 0 62 224.14 D 8000 I By Family Trust Class A Common Stock 2026-08-21 4 S 0 92 214.73 D 33840 I By Pension Trust Class A Common Stock 2026-08-21 4 S 0 183 216.38 D 33657 I By Pension Trust Class A Common Stock 2026-08-21 4 S 0 92 218.14 D 33565 I By Pension Trust Class A Common Stock 2026-08-21 4 S 0 365 221.37 D 33200 I By Pension Trust Class A Common Stock 2026-08-21 4 S 0 1006 222.43 D 32194 I By Pension Trust Class A Common Stock 2026-08-21 4 S 0 694 224.13 D 31500 I By Pension Trust Class A Common Stock 31005 D Class A Common Stock 26667 I By IGSB Cardinal I, LLC Class A Common Stock 142857 I By IGSB Gaucho Fund I, LLC Class A Common Stock 9805 I By IGSB Cardinal Core BV, LLC Class A Common Stock 7022 I By Charitable Remainder 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 $214.75 to $215.61, 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 $216.01 to $216.94, 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 $217.03 to $218.02, 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 $218.03 to $218.99, 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 $219.03 to $220.02, 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 $214.36 to $214.95, 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 $220.96 to $221.895, 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 $222.09 to $223.08, 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 $223.59 to $224.40, 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 Class A Shares are owned by IGSB Cardinal I, LLC, a limited liability company, of which the Reporting Person is the managing member. In that capacity, the Reporting Person possesses sole voting and dispositive power over these Class A Shares. However, the Reporting Person disclaims beneficial ownership in these Class A Shares, except to the extent of any pecuniary interest he may have therein. These Class A Shares are owned by IGSB Gaucho Fund I, LLC, a limited liability company, of which the Reporting Person is the managing member. In that capacity, the Reporting Person possesses sole voting and dispositive power over these Class A Shares. However, the Reporting Person disclaims beneficial ownership in these Class A Shares, except to the extent of any pecuniary interest he may have therein. These Class A Shares are owned by IGSB Cardinal Core BV, LLC, a limited liability company, of which the Reporting Person is the managing member. In that capacity, the Reporting Person possesses sole voting and dispositive power over these Class A Shares, but he disclaims beneficial ownership in these Class A Shares, except to the extent of any pecuniary interest he may have therein. These Class A Shares are held by a trust of which the Reporting Person is a co-trustee and, in that capacity, he may be deemed to share voting and dispositive power over these Class A Shares with the other trustee. However, the Reporting Person does not have a pecuniary interest in, and he disclaims beneficial ownership of, these Class A Shares. /s/ Kimberly Shea, Attorney-in-Fact for Maurice J. Duca 2026-08-24