13D Filing: Abdiel Qualified Master Fund LP and Appian Corp (APPN)

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CUSIP No. 03782L101		Page 7 of 9 Pages

AMENDMENT NO. 7 TO SCHEDULE 13D

This Amendment No. 7 (Amendment No. 7) amends and supplements the Schedule 13D filed on June 12, 2017 (the Original Schedule
13D) as amended by Amendment No. 1 thereto on June 27, 2017 (Amendment No. 1), Amendment No. 2 thereto on June 29, 2017 (Amendment No. 2), Amendment No. 3 thereto on July 3, 2017
(Amendment No. 3), Amendment No. 4 thereto on July 7, 2017, Amendment No. 5 thereto on July 12, 2017 (Amendment No. 5) and Amendment No. 6 thereto on July 31, 2017 (Amendment
No. 6 and, together with the Original Schedule 13D, Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No. 4 and Amendment No. 5, the Schedule 13D), relating to the shares of Class A
common stock, $0.001 par value per share (the Common Stock), of Appian Corporation (the Issuer). Each Item below amends and supplements the information disclosed under the corresponding Item of the Schedule 13D. Except as
specifically provided herein, this Amendment No. 7 does not modify any of the information previously reported in the Schedule 13D. Capitalized terms used but not defined in this Amendment No. 7 shall have the same meanings herein as are
ascribed to such terms in the Schedule 13D.

Item 3.

Source and Amount of Funds or Other Consideration.

Item 3 of the Schedule 13D is hereby supplemented by
adding the following:

In a series of transactions completed through October 25, 2017, the Reporting Persons acquired an aggregate amount of 116,771
shares of the Common Stock for the accounts of Abdiel Qualified Master Fund, LP and Abdiel Capital, LP for aggregate consideration of approximately $2.5 million (including commissions). The source of funds used to acquire the 116,771 shares of
Common Stock was the working capital of Abdiel Qualified Master Fund, LP and Abdiel Capital, LP.

Item 5.

Interest in Securities of the Issuer.

Item 5 of the Schedule 13D is hereby amended by amending and
restating paragraphs (a) and (b) thereof as follows:

(a) The information requested by this paragraph is incorporated herein by reference to the
information provided on the cover pages to this Amendment No. 7.

(b) The information requested by this paragraph is incorporated herein by reference
to the information provided on the cover pages to this Amendment No. 7 and Item 2(c) of the Schedule 13D.

Item 5(c) of the Schedule 13D is hereby
supplemented by adding the following:

(c) Information with respect to all transactions in the Common Stock which were effected during the past sixty days
is set forth on Exhibit I attached hereto and incorporated herein by reference.