APPN

SEC source: 0001441683-21-000028 · wf-form4_161732111526571.xml · nonDerivative · entry 7

Biddle Albert G.W. III · CIK 0001707248 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 96,721

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 4, 2019, as amended on December 4, 2020.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $141.79 to $142.76, inclusive.

F4 · ownership.nature: The reported securities are owned directly by Jack Biddle, Inc. ("JBI"). The Reporting Person is the president of JBI.

SEC source: 0001441683-21-000028 · wf-form4_161732111526571.xml · nonDerivative · entry 6

Biddle Albert G.W. III · CIK 0001707248 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 97,266

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 4, 2019, as amended on December 4, 2020.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $140.75 to $141.72, inclusive.

F4 · ownership.nature: The reported securities are owned directly by Jack Biddle, Inc. ("JBI"). The Reporting Person is the president of JBI.

SEC source: 0001441683-21-000028 · wf-form4_161732111526571.xml · nonDerivative · entry 5

Biddle Albert G.W. III · CIK 0001707248 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 97,491

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 4, 2019, as amended on December 4, 2020.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.64 to $140.35, inclusive.

F4 · ownership.nature: The reported securities are owned directly by Jack Biddle, Inc. ("JBI"). The Reporting Person is the president of JBI.

SEC source: 0001441683-21-000028 · wf-form4_161732111526571.xml · nonDerivative · entry 4

Biddle Albert G.W. III · CIK 0001707248 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 97,737

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 4, 2019, as amended on December 4, 2020.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $138.59 to $139.42, inclusive.

F4 · ownership.nature: The reported securities are owned directly by Jack Biddle, Inc. ("JBI"). The Reporting Person is the president of JBI.

SEC source: 0001441683-21-000028 · wf-form4_161732111526571.xml · nonDerivative · entry 3

Biddle Albert G.W. III · CIK 0001707248 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 98,302

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 4, 2019, as amended on December 4, 2020.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $137.51 to $138.45, inclusive.

F4 · ownership.nature: The reported securities are owned directly by Jack Biddle, Inc. ("JBI"). The Reporting Person is the president of JBI.

SEC source: 0001441683-21-000028 · wf-form4_161732111526571.xml · nonDerivative · entry 2

Biddle Albert G.W. III · CIK 0001707248 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 99,168

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 4, 2019, as amended on December 4, 2020.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $136.50 to $137.47, 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 footnotes (3) through (31).

F4 · ownership.nature: The reported securities are owned directly by Jack Biddle, Inc. ("JBI"). The Reporting Person is the president of JBI.

SEC source: 0001441683-21-000028 · wf-form4_161732111526571.xml · nonDerivative · entry 1

Biddle Albert G.W. III · CIK 0001707248 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,870

F1 · kind: These shares were granted under the Issuer's 2017 Equity Incentive Plan pursuant to the Issuer's Non-Employee Director Compensation Policy approved by the Board of Directors on May 10, 2017.

SEC source: 0001441683-21-000027 · wf-form4_161730808729558.xml · nonDerivative · entry 1

Boccassam Prashanth · CIK 0001706771 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,572

F1 · kind: These shares were granted under the Issuer's 2017 Equity Incentive Plan pursuant to the Issuer's Non-Employee Director Compensation Policy, as amended and approved by the Board of Directors on December 18, 2020.

SEC source: 0001441683-21-000026 · wf-form4_161730806672658.xml · nonDerivative · entry 1

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,682

F1 · kind: These shares were granted under the Issuer's 2017 Equity Incentive Plan pursuant to the Issuer's Non-Employee Director Compensation Policy, as amended and approved by the Board of Directors on December 18, 2020.

SEC source: 0001441683-21-000025 · wf-form4_161730802810389.xml · nonDerivative · entry 1

Kilberg Bobbie G · CIK 0001362638 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 235

F1 · kind: These shares were granted under the Issuer's 2017 Equity Incentive Plan pursuant to the Issuer's Non-Employee Director Compensation Policy, as amended and approved by the Board of Directors on December 18, 2020.

SEC source: 0001441683-21-000024 · wf-form4_161730798804414.xml · nonDerivative · entry 1

Devine Michael G · CIK 0001435102 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,080

F1 · kind: These shares were granted under the Issuer's 2017 Equity Incentive Plan pursuant to the Issuer's Non-Employee Director Compensation Policy, as amended and approved by the Board of Directors on December 18, 2020.

SEC source: 0001441683-21-000023 · wf-form4_161618518781547.xml · derivative · entry 2

Kramer Robert Charles · CIK 0001707249 · Director · General Manager

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 2,214,598

Underlying: Class A Common Stock · 80,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (2))

F2 · derivative.exercise_price: (continued from Footnote (1)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

F1 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (2))

F2 · derivative.exercise_date: (continued from Footnote (1)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

F1 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (2))

F2 · derivative.expiration_date: (continued from Footnote (1)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

F3 · ownership.nature: The reported securities are owned directly by The Robert C. Kramer Trust (the "Trust"). The Reporting Person is the sole trustee and beneficiary of the Trust.

SEC source: 0001441683-21-000023 · wf-form4_161618518781547.xml · nonDerivative · entry 1

Kramer Robert Charles · CIK 0001707249 · Director · General Manager

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,225

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (2))

F2 · price: (continued from Footnote (1)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · derivative · entry 15

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 35,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (3))

F3 · derivative.exercise_price: (continued from Footnote (2)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

F2 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (3))

F3 · derivative.exercise_date: (continued from Footnote (2)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

F2 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (3))

F3 · derivative.expiration_date: (continued from Footnote (2)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · derivative · entry 14

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,000

Underlying: Class A Common Stock · 35,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (3))

F3 · derivative.exercise_price: (continued from Footnote (2)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

F2 · derivative.exercise_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (3))

F3 · derivative.exercise_date: (continued from Footnote (2)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

F2 · derivative.expiration_date: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (3))

F3 · derivative.expiration_date: (continued from Footnote (2)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · derivative · entry 13

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,896

Underlying: Class B Common Stock · 35,000 shares

Expires 2025-11-17

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F14 · derivative.exercise_date: Fully vested.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 12

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,041

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $162.29 to $163.36, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 11

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,858

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $161.23 to $162.20, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 10

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,966

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $160.05 to $161.00, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 9

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,966

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $158.99 to $159.83, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 8

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,480

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $157.84 to $158.81, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 7

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,480

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 6

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,500

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $163.42 to $163.98, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 5

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,941

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $157.74 to $157.83, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 4

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,841

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $157.64 to $157.72, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 3

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,141

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $156.62 to $157.60, inclusive.

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 2

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,441

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $155.53 to $156.37, 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 footnotes (4) - (13).

SEC source: 0001441683-21-000022 · wf-form4_161549659587675.xml · nonDerivative · entry 1

Winters Christopher · CIK 0001706796 · General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,041

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Pursuant to the terms of the Class B Common Stock, the Reporting Person converted shares of Class B Common Stock into shares of Class A Common Stock.

F2 · price: Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock and has no expiration date. In addition, each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon (1) any transfer, whether or not for value and whether voluntary or involuntary or by operation of law, except for certain transfers described in the Issuer's certificate of incorporation, including, without limitation, certain transfers for tax and estate planning purposes or (continued to Footnote (3))

F3 · price: (continued from Footnote (2)) (2) the death or disability, as defined in the Issuer's certificate of incorporation, of the applicable Class B common stockholder (or nine months after the date of death or disability if the stockholder is one of the Issuer's founders). In addition, on the first trading day following the date on which the outstanding shares of Class B Common Stock represent less than 10% of the aggregate voting power of the Issuer's then outstanding capital stock, all outstanding shares of Class B Common Stock shall convert automatically into Class A Common Stock, and no additional shares of Class B Common Stock will be issued.

SEC source: 0001441683-21-000019 · wf-form4_161428704791403.xml · nonDerivative · entry 6

Boccassam Prashanth · CIK 0001706771 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,337

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 20, 2020.

SEC source: 0001441683-21-000019 · wf-form4_161428704791403.xml · nonDerivative · entry 5

Boccassam Prashanth · CIK 0001706771 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,337

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 20, 2020.

SEC source: 0001441683-21-000019 · wf-form4_161428704791403.xml · nonDerivative · entry 4

Boccassam Prashanth · CIK 0001706771 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,437

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 20, 2020.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $175.29 to $175.52, inclusive.

SEC source: 0001441683-21-000019 · wf-form4_161428704791403.xml · nonDerivative · entry 3

Boccassam Prashanth · CIK 0001706771 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,737

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 20, 2020.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $173.59 to $174.57, inclusive.

SEC source: 0001441683-21-000019 · wf-form4_161428704791403.xml · nonDerivative · entry 2

Boccassam Prashanth · CIK 0001706771 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,237

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 20, 2020.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $172.33 to $172.82, inclusive.

SEC source: 0001441683-21-000019 · wf-form4_161428704791403.xml · nonDerivative · entry 1

Boccassam Prashanth · CIK 0001706771 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,657

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 20, 2020.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $162.22 to $172.11, 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 footnotes (1) - (4).

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 12

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,447

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F13 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $174.30 to $175.17, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 11

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,747

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F12 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $168.02 to $169.01, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 10

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,651

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F11 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $173.12 to $174.00, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 9

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,951

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $166.93 to $167.47, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 8

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,712

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $172.00 to $172.82, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 7

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,312

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F8 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $165.00 to $165.99, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 6

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,512

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $180.01 to $180.36, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 5

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,547

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $170.77 to $171.28, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 4

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,547

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $163.95 to $164.88, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 3

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,247

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $176.03 to $177.00, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 2

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,447

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $169.16 to $170.08, inclusive.

SEC source: 0001441683-21-000020 · wf-form4_161428711005218.xml · nonDerivative · entry 1

Mulligan Michael J. · CIK 0001706773 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,747

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 16, 2020.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $162.57 to $163.52, 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 footnotes (1) through (12).

SEC source: 0000899243-21-003827 · doc4.xml · nonDerivative · entry 18

Abdiel Capital Management, LLC · CIK 0001659179 · 10% owner

Abdiel Qualified Master Fund LP · CIK 0001508239 · 10% owner

Abdiel Capital LP · CIK 0001362771 · 10% owner

Abdiel Capital Advisors, LP · CIK 0001578684 · 10% owner

Moran Colin T. · CIK 0001659198 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Abdiel Capital, LP

Disclosed balance after: 5,281,078

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $243.24 to $243.45. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer 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.

F1 · ownership.nature: The share numbers in Column 5 represent the aggregated holdings of Abdiel Qualified Master Fund, LP ("AQMF") and Abdiel Capital, LP ("ACLP"). Abdiel Capital Management, LLC is the general partner of AQMF and ACLP, and Abdiel Capital Advisors, LP serves as the investment manager of AQMF and ACLP. Colin T. Moran is the managing member of Abdiel Capital Management, LLC and Abdiel Capital Partners, LLC, which is the general partner of Abdiel Capital Advisors, LP. By virtue of the foregoing relationships, each of the Reporting Persons may be deemed to beneficially own the securities held by AQMF and ACLP. Each Reporting Person disclaims beneficial ownership of such securities, except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-003827 · doc4.xml · nonDerivative · entry 17

Abdiel Capital Management, LLC · CIK 0001659179 · 10% owner

Abdiel Qualified Master Fund LP · CIK 0001508239 · 10% owner

Abdiel Capital LP · CIK 0001362771 · 10% owner

Abdiel Capital Advisors, LP · CIK 0001578684 · 10% owner

Moran Colin T. · CIK 0001659198 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Abdiel Qualified Master Fund, LP

Disclosed balance after: 5,281,087

F10 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $243.24 to $243.45. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer 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.

F1 · ownership.nature: The share numbers in Column 5 represent the aggregated holdings of Abdiel Qualified Master Fund, LP ("AQMF") and Abdiel Capital, LP ("ACLP"). Abdiel Capital Management, LLC is the general partner of AQMF and ACLP, and Abdiel Capital Advisors, LP serves as the investment manager of AQMF and ACLP. Colin T. Moran is the managing member of Abdiel Capital Management, LLC and Abdiel Capital Partners, LLC, which is the general partner of Abdiel Capital Advisors, LP. By virtue of the foregoing relationships, each of the Reporting Persons may be deemed to beneficially own the securities held by AQMF and ACLP. Each Reporting Person disclaims beneficial ownership of such securities, except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-003827 · doc4.xml · nonDerivative · entry 16

Abdiel Capital Management, LLC · CIK 0001659179 · 10% owner

Abdiel Qualified Master Fund LP · CIK 0001508239 · 10% owner

Abdiel Capital LP · CIK 0001362771 · 10% owner

Abdiel Capital Advisors, LP · CIK 0001578684 · 10% owner

Moran Colin T. · CIK 0001659198 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Abdiel Capital, LP

Disclosed balance after: 5,281,378

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $242.04 to $242.78. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer 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.

F1 · ownership.nature: The share numbers in Column 5 represent the aggregated holdings of Abdiel Qualified Master Fund, LP ("AQMF") and Abdiel Capital, LP ("ACLP"). Abdiel Capital Management, LLC is the general partner of AQMF and ACLP, and Abdiel Capital Advisors, LP serves as the investment manager of AQMF and ACLP. Colin T. Moran is the managing member of Abdiel Capital Management, LLC and Abdiel Capital Partners, LLC, which is the general partner of Abdiel Capital Advisors, LP. By virtue of the foregoing relationships, each of the Reporting Persons may be deemed to beneficially own the securities held by AQMF and ACLP. Each Reporting Person disclaims beneficial ownership of such securities, except to the extent of its or his pecuniary interest therein.

SEC source: 0000899243-21-003827 · doc4.xml · nonDerivative · entry 15

Abdiel Capital Management, LLC · CIK 0001659179 · 10% owner

Abdiel Qualified Master Fund LP · CIK 0001508239 · 10% owner

Abdiel Capital LP · CIK 0001362771 · 10% owner

Abdiel Capital Advisors, LP · CIK 0001578684 · 10% owner

Moran Colin T. · CIK 0001659198 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Abdiel Qualified Master Fund, LP

Disclosed balance after: 5,281,440

F9 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $242.04 to $242.78. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer 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.

F1 · ownership.nature: The share numbers in Column 5 represent the aggregated holdings of Abdiel Qualified Master Fund, LP ("AQMF") and Abdiel Capital, LP ("ACLP"). Abdiel Capital Management, LLC is the general partner of AQMF and ACLP, and Abdiel Capital Advisors, LP serves as the investment manager of AQMF and ACLP. Colin T. Moran is the managing member of Abdiel Capital Management, LLC and Abdiel Capital Partners, LLC, which is the general partner of Abdiel Capital Advisors, LP. By virtue of the foregoing relationships, each of the Reporting Persons may be deemed to beneficially own the securities held by AQMF and ACLP. Each Reporting Person disclaims beneficial ownership of such securities, except to the extent of its or his pecuniary interest therein.