SCHEDULE 13D/A

Appian Corp

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

Event date: 2025-05-16

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: 8,808,255 · Class: 20.4%

• Abdiel Capital, LPReported CIK 0001362771

  Shares: 377,476 · Class: 0.9%

• Abdiel Partners, LLCReported CIK 0001963356

  Shares: 14,670 · Class: 0.0%

• Abdiel Capital Management, LLCReported CIK 0001659179

  Shares: 9,185,731 · Class: 21.3%

• Abdiel Capital Advisors, LPReported CIK 0001578684

  Shares: 9,200,401 · Class: 21.3%

• Colin T. MoranReported CIK 0001659198

  Shares: 9,200,401 · Class: 21.3%

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