Ahmet H. Okumus / Managing Member

SCHEDULE 13G 0001832568 XXXXXXXX LIVE Class A Common Stock, par value $0.0001 per share 02/20/2026 0001441683 APPIAN CORPORATION 03782L101 7950 Jones Branch Drive McLean VA 22102 Rule 13d-1(c) RPD Fund Management LLC b DE 0.00 3900656.00 0.00 3900656.00 3900656.00 N 9.1 IA OO RPD Opportunity Fund LP b DE 0.00 3225956.00 0.00 3225956.00 3225956.00 N 7.5 PN RPD Opportunity LLC b DE 0.00 3225956.00 0.00 3225956.00 3225956.00 N 7.5 OO Ahmet H.Okumus b W8 0.00 3900656.00 0.00 3900656.00 3900656.00 N 9.1 HC IN APPIAN CORPORATION 7950 Jones Branch Drive, McLean, Virginia 22102, United States of America RPD Fund Management LLC RPD Opportunity Fund LP RPD Opportunity LLC Ahmet H. Okumus RPD Fund Management LLC 599 Lexington Avenue, 47th Floor New York, New York 10022 United States of America RPD Opportunity Fund LP c/o RPD Fund Management LLC 599 Lexington Avenue, 47th Floor New York, New York 10022 United States of America RPD Opportunity LLC 599 Lexington Avenue, 47th Floor New York, New York 10022 United States of America Ahmet H. Okumus c/o RPD Fund Management LLC 599 Lexington Avenue, 47th Floor New York, New York 10022 United States of America RPD Fund Management LLC - Delaware RPD Opportunity Fund LP - Delaware RPD Opportunity LLC - Delaware Ahmet H. Okumus - Republic of Turkey Y RPD Fund Management LLC - 3,900,656 RPD Opportunity Fund LP - 3,225,956 RPD Opportunity LLC - 3,225,956 Ahmet H. Okumus - 3,900,656 RPD Fund Management LLC - 9.1% RPD Opportunity Fund LP - 7.5% RPD Opportunity LLC - 7.5% Ahmet H. Okumus - 9.1% RPD Fund Management LLC - 0 RPD Opportunity Fund LP - 0 RPD Opportunity LLC - 0 Ahmet H. Okumus - 0 RPD Fund Management LLC - 3,900,656 RPD Opportunity Fund LP - 3,225,956 RPD Opportunity LLC - 3,225,956 Ahmet H. Okumus - 3,900,656 RPD Fund Management LLC - 0 RPD Opportunity Fund LP - 0 RPD Opportunity LLC - 0 Ahmet H. Okumus - 0 RPD Fund Management LLC - 3,900,656 RPD Opportunity Fund LP - 3,225,956 RPD Opportunity LLC - 3,225,956 Ahmet H. Okumus - 3,900,656 Y N All of the securities reported in this Schedule 13G are directly owned by advisory clients of RPD Fund Management LLC. None of those advisory clients other than RPD Opportunity Fund LP may be deemed to beneficially own more than 5% of the Class A Common Stock, par value $0.0001 per share. N Please see Exhibit B attached hereto. Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above 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. Exhibit A - Joint Filing Agreement Exhibit B - Control Person Identification RPD Fund Management LLC By: /s/ Ahmet H. Okumus Ahmet H. Okumus / Managing Member 02/24/2026 RPD Opportunity Fund LP By: RPD Opportunity LLC, its general partner, By: /s/ Ahmet H. Okumus Ahmet H. Okumus / Managing Member 02/24/2026 RPD Opportunity LLC By: /s/ Ahmet H. Okumus Ahmet H. Okumus / Managing Member 02/24/2026 Ahmet H.Okumus By: /s/ Ahmet H. Okumus Ahmet H. Okumus 02/24/2026 * Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his, her or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.