SCHEDULE 13D/A

Appian Corp

Class A Common Stock, $0.0001 par value · CUSIP: 03782L101

Event date: 2025-08-12

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Abdiel Qualified Master Fund, LPReported CIK 0001508239

  Shares: 2,678,198 · Class: 6.2%

• Abdiel Capital, LPReported CIK 0001362771

  Shares: 128,515 · Class: 0.3%

• Abdiel Partners, LLCReported CIK 0001963356

  Shares: 5,217 · Class: 0.0%

• Abdiel Capital Management, LLCReported CIK 0001659179

  Shares: 2,806,713 · Class: 6.5%

• Abdiel Capital Advisors, LPReported CIK 0001578684

  Shares: 2,811,930 · Class: 6.6%

• Colin T. MoranReported CIK 0001659198

  Shares: 2,811,930 · Class: 6.6%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.