X0202 SCHEDULE 13G 0001802797 XXXXXXXX LIVE Class A Common Stock, par value $0.0001 06/30/2026 0001441683 Appian Corporation 03782L101 7950 Jones Branch Drive McClean VA 22102 Rule 13d-1(b) Lead Edge Capital Management, LLC b DE 0 2878544 0 2878544 2878544 N 6.8 IA OO Please see note in Item 4(a) Mitchell Green b X1 0 2878544 0 2878544 2878544 N 6.8 HC IN Please see note in Item 4(a) Brian Neider b X1 0 2878544 0 2878544 2878544 N 6.8 HC IN Please see note in Item 4(a) Nimay Mehta b X1 0 2878544 0 2878544 2878544 N 6.8 HC IN Please see note in Item 4(a) Appian Corporation 7950 Jones Branch Drive McClean, Virginia 22102 Lead Edge Capital Management, LLC* Mitchell Green* Brian Neider* Nimay Mehta* 96 Spring Street, Floors 5 & 6 New York, New York 10012 Lead Edge Capital Management, LLC - Delaware Mitchell Green - United States Brian Neider - United States Nimay Mehta - United States N IA HC Lead Edge Capital Management, LLC: 2,878,544* Mitchell Green: 2,878,544* Brian Neider: 2,878,544* Nimay Mehta: 2,878,544* *The Common Stock (the "Shares") of Appian Corporation (the "Issuer") reported herein represents Shares that are held by private investment funds (the "Lead Edge Entities") for which Lead Edge Capital Management, LLC serves as the investment manager (the "Investment Manager"). Mitchell Green, Brian Neider, and Nimay Mehta serve as the managing members of the Investment Manager (the "Managing Members", and collectively with the Lead Edge Entities and the Investment Manager, the "Reporting Persons.") By virtue of these relationships, the Reporting Persons may be deemed to have shared voting and dispositive power with respect to the Shares owned directly by the Lead Edge Entities. The percent of class reported herein is based upon statements in the Issuer's Form 10-Q filed on May 7, 2026 that there were 42,324,735 Shares outstanding as of May 4, 2026. This Schedule 13G shall not be deemed an admission that the Reporting Persons are beneficial owners of the Shares for purposes of Section 13 of the Securities Exchange Act of 1934, as amended, or for any other purpose. Each of the Reporting Persons disclaims beneficial ownership of the Shares reported herein except to the extent of the Reporting Person's pecuniary interest, if any, therein. Lead Edge Capital Management, LLC - 6.8%* Mitchell Green - 6.8%* Brian Neider - 6.8%* Nimay Mehta - 6.8%* Lead Edge Capital Management, LLC - 0 Mitchell Green - 0 Brian Neider - 0 Nimay Mehta - 0 Lead Edge Capital Management, LLC - 2,878,544* Mitchell Green - 2,878,544* Brian Neider - 2,878,544* Nimay Mehta - 2,878,544* Lead Edge Capital Management, LLC - 0 Mitchell Green - 0 Brian Neider - 0 Nimay Mehta - 0 Lead Edge Capital Management, LLC - 2,878,544* Mitchell Green - 2,878,544* Brian Neider - 2,878,544* Nimay Mehta - 2,878,544* Y N Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Lead Edge Capital Management, LLC /s/ Mitchell Green 06/30/2026 Mitchell Green /s/ Mitchell Green 06/30/2026 Brian Neider /s/ Brian Neider 06/30/2026 Nimay Mehta /s/ Nimay Mehta 06/30/2026