X0609 4 2026-07-07 0 0001441683 APPIAN CORP APPN 0001309192 Calkins Matthew W false 7950 JONES BRANCH DRIVE MCLEAN VA 22102 1 1 1 0 CEO and President 1 Class A Common Stock 2026-07-07 4 S 0 37515 24.61 D 1731629 D Class A Common Stock 2026-07-07 4 S 0 12485 25.07 D 1719144 D Represents sales that occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 5, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.87 to $24.86, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.87 to $25.24, 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. /s/ Angela Patterson, Attorney-in-Fact 2026-07-08