Appian stockholders elect all director nominees and approve all proposals at annual meeting

Proposal 1 – Election of Directors The Company’s stockholders elected all nominees for director. The votes were cast as follows: Name Votes For Votes Withheld Broker Non-Votes Matthew Calkins 316,583,373 5,707,344 6,336,379 Michael Beckley 316,664,296 5,626,421 6,336,379 Robert C. Kramer 316,694,476 5,596,241 6,336,379 Shirley A. Edwards 315,706,899 6,583,818 6,336,379 Carl "Boe" Hartman II 321,883,825 406,892 6,336,379 Barbara "Bobbie" Kilberg 310,152,726 12,137,991 6,336,379 David Link 322,080,474 210,243 6,336,379 Mark Lynch 317,056,136 5,234,581 6,336,379

Proposal 4 - Advisory Vote on the Frequency of Future Advisory Votes on Named Executive Officer Compensation The Company's stockholders indicated, on a non-binding advisory basis, the preferred frequency for the solicitation of future advisory stockholder approval of compensation paid to the Company's named executive officers be held every year. The votes were cast as follows: 1 year 2 years 3 years Abstained 322,210,378 16,527 17,032 46,780

Proposal 5 - Approval of the Amended and Restated 2017 Equity Incentive Plan The Company's stockholders approved Proposal 5. The votes were cast as follows: Votes For Votes Against Abstained Broker Non-Votes 303,474,350 18,783,302 33,065 6,336,379

Proposal 2 – Ratification of the Appointment of Independent Registered Public Accounting Firm The Company’s stockholders approved Proposal 2. The votes were cast as follows: Votes For Votes Against Abstained 328,493,007 64,169 69,920

Proposal 3 – Advisory Vote on Executive Compensation The Company’s stockholders approved, on a non-binding advisory basis, Proposal 3. The votes were cast as follows: Votes For Votes Against Abstained Broker Non-Votes 321,617,550 630,831 42,336 6,336,379