Sec Form 4 Filing - MITCHELL DAVID LEON @ APPIAN CORP - 2020-03-06

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person MITCHELL DAVID LEON 2. Issuer Name and Ticker or Trading Symbol APPIAN CORP [ APPN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Senior VP, Worldwide Sales (Last) (First) (Middle) C/O APPIAN CORPORATION, 7950 JONES BRANCH DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 03/06/2020 (Street) TYSONS, VA22102 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 03/06/2020 M 10,000 A $ 0 ( 1 ) 18,837 D Class A Common Stock 03/06/2020 S( 2 ) 3,091 D $ 46.83 ( 3 ) 15,746 D Class A Common Stock 03/06/2020 S( 2 ) 100 D $ 47.29 15,646 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Unit ( 4 ) 03/06/2020 M 10,000 ( 5 ) ( 5 ) Class A Common Stock 10,000 $ 0 54,917 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other MITCHELL DAVID LEON C/O APPIAN CORPORATION 7950 JONES BRANCH DRIVE TYSONS, VA22102 Senior VP, Worldwide Sales Signatures /s/ Angela Patterson, Attorney-in-Fact 03/09/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each Restricted Stock Unit ("RSU") converts into Class A Common Stock on a one-for-one basis. ( 2 )The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 21, 2019, solely to cover taxes, commissions and fees due upon vesting of RSUs. ( 3 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.25 to $47.23, inclusive. The Reporting Person undertakes to provide to Appian Corporation, any security holder of Appian Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (3). ( 4 )Each RSU represents a contingent right to receive one share of Issuer's Class A Common Stock (or its cash equivalent, at the discretion of the Issuer). ( 5 )The RSUs were granted on 2/15/2018 and vest in five (5) equal annual installments commencing on the one-year anniversary of 3/5/2018, provided that the Reporting Person has provided continuous service to the Issuer through such vesting date.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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