[SCHEDULE 13D/A] Appian Corporation SEC Filing

Rhea-AI Filing Summary

Abdiel-affiliated investors report combined beneficial ownership of 2,811,930 shares of Appian Corporation Class A common stock, representing 6.6% of the outstanding Class A shares. The Schedule 13D/A lists six Reporting Persons filing jointly, including Abdiel Qualified Master Fund, LP; Abdiel Capital, LP; Abdiel Partners, LLC; Abdiel Capital Management, LLC; Abdiel Capital Advisors, LP; and Colin T. Moran. Individual holdings shown on the cover pages include 2,678,198 shares held by Abdiel Qualified Master Fund, LP and 128,515 shares held by Abdiel Capital, LP, totaling the reported aggregate. The filing incorporates prior Schedule 13D amendments and references Exhibit A for transactions since the prior amendment. Several disclosure items state that purpose, source of funds and contracts or arrangements are "Not Applicable." The cover-page percentage calculations use 42,943,872 shares of Class A common stock outstanding to compute ownership percentages.

Positive

• Consolidated disclosure of ownership: Reporting Persons clearly aggregate holdings across Abdiel entities and an individual for transparent beneficial ownership reporting.
• Material stake disclosed: Combined beneficial ownership of 2,811,930 shares, representing 6.6% of Class A shares, exceeds a 5% reporting threshold.
• Reference to transaction detail: The filing references Exhibit A for transactions since the prior amendment, enabling verification of recent activity.

Negative

• None.

Insights

Securities Analyst

TL;DR: Abdiel group discloses a combined beneficial stake of 6.6% in Appian, reported via an amended Schedule 13D; Exhibit A lists recent transactions.

The filing consolidates holdings across multiple Abdiel entities and an individual, specifying shared voting and dispositive power over 2,811,930 Class A shares, which equates to 6.6% of the Class A float used for the calculation. The amendment updates the record and points readers to Exhibit A for the granular trades since the prior amendment. Several standard Schedule 13D items remain marked "Not Applicable," indicating no new contractual arrangements or stated purpose disclosed in this amendment. For investors and governance watchers, the key takeaway is the maintained disclosure of a >5% stake held by a coordinated group, presented with consolidated reporting and historical amendment references.

Corporate Governance Expert

TL;DR: Coordinated reporting across Abdiel entities shows transparency of ownership structure and shared control over 6.6% of Appian Class A shares.

The amendment clarifies which Abdiel entities hold the shares and shows shared voting and dispositive power rather than sole control, reflecting coordinated beneficial ownership without disclosure of new agreements or change of purpose. The Joint Filing Agreement and multiple prior amendments are referenced, demonstrating ongoing reporting compliance. The presence of Exhibit A for recent transactions provides the procedural detail investors may review to assess recent changes in position size, though this amendment does not itself assert any strategic intentions or contractual arrangements with the issuer.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 53)

Appian Corporation

(Name of Issuer)

Class A Common Stock, $0.0001 par value

(Title of Class of Securities)

03782L101

(CUSIP Number)

Abdiel Capital
90 Park Avenue, 29th Floor, Attn: Colin T. Moran
New York, NY, 10016
(646) 496-9202

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

08/12/2025

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP No. 03782L101

1

Name of reporting person

Abdiel Qualified Master Fund, LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,678,198.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,678,198.00

11

Aggregate amount beneficially owned by each reporting person

2,678,198.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.2 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP No. 03782L101

1

Name of reporting person

Abdiel Capital, LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 128,515.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 128,515.00

11

Aggregate amount beneficially owned by each reporting person

128,515.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.3 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP No. 03782L101

1

Name of reporting person

Abdiel Partners, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 5,217.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 5,217.00

11

Aggregate amount beneficially owned by each reporting person

5,217.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

0.0 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP No. 03782L101

1

Name of reporting person

Abdiel Capital Management, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,806,713.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,806,713.00

11

Aggregate amount beneficially owned by each reporting person

2,806,713.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.5 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Rows 8, 10 and 11. Consists of 2,678,198 shares of Class A Common Stock held by Abdiel Qualified Master Fund, LP and 128,515 shares of Class A Common Stock held by Abdiel Capital, LP.

SCHEDULE 13D

CUSIP No. 03782L101

1

Name of reporting person

Abdiel Capital Advisors, LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,811,930.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,811,930.00

11

Aggregate amount beneficially owned by each reporting person

2,811,930.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.6 %

14

Type of Reporting Person (See Instructions)

PN, IA

Comment for Type of Reporting Person:

Rows 8, 10 and 11. Consists of 2,678,198 shares of Class A Common Stock held by Abdiel Qualified Master Fund, LP, 128,515 shares of Class A Common Stock held by Abdiel Capital, LP. and 5,217 shares of Class A Common Stock held by Abdiel Partners, LLC.

SCHEDULE 13D

CUSIP No. 03782L101

1

Name of reporting person

Colin T. Moran

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,811,930.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,811,930.00

11

Aggregate amount beneficially owned by each reporting person

2,811,930.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.6 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Rows 8, 10 and 11. Consists of 2,678,198 shares of Class A Common Stock held by Abdiel Qualified Master Fund, LP, 128,515 shares of Class A Common Stock held by Abdiel Capital, LP. and 5,217 shares of Class A Common Stock held by Abdiel Partners, LLC.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Class A Common Stock, $0.0001 par value
(b)	Name of Issuer: Appian Corporation
(c)	Address of Issuer's Principal Executive Offices: 7950 Jones Branch Drive, McLean, VIRGINIA , 22102.
Item 1 Comment: Reference is hereby made to the statement on Schedule 13D filed with the Securities and Exchange Commission by the Reporting Persons with respect to the Class A Common Stock of the Issuer on June 12, 2017, Amendment No. 1 thereto on June 27, 2017, Amendment No. 2 thereto on June 29, 2017, Amendment No. 3 thereto on July 3, 2017, Amendment No. 4 thereto on July 7, 2017, Amendment No. 5 thereto on July 12, 2017, Amendment No. 6 thereto on July 31, 2017, Amendment No. 7 thereto on October 26, 2017, Amendment No. 8 thereto on November 20, 2017, Amendment No. 9 thereto on November 30, 2017, Amendment No. 10 thereto on December 12, 2017, Amendment No. 11 thereto on December 15, 2017, Amendment No. 12 thereto on February 23, 2018, Amendment No. 13 thereto on March 20, 2018, Amendment No. 14 thereto on March 27, 2018, Amendment No. 15 thereto on April 25, 2018, Amendment No. 16 thereto on April 30, 2018, Amendment No. 17 thereto on August 3, 2018, Amendment No. 18 thereto on August 24, 2018, Amendment No. 19 thereto on October 5, 2018, Amendment No. 20 thereto on October 15, 2018, Amendment No. 21 thereto on October 31, 2018, Amendment No. 22 thereto on November 2, 2018, Amendment No. 23 thereto on December 17, 2018, Amendment No. 24 thereto on February 22, 2019, Amendment No. 25 thereto on September 9, 2019, Amendment No. 26 thereto on December 3, 2020, Amendment No. 27 thereto on February 1, 2021, Amendment No. 28 thereto on May 5, 2022, Amendment No. 29 thereto on May 9, 2022, Amendment No. 30 thereto on May 11, 2022, Amendment No. 31 thereto on May 25, 2022, Amendment No. 32 thereto on November 14, 2022, Amendment No. 33 thereto on January 19, 2023, Amendment No. 34 thereto on January 26, 2023, Amendment No. 35 thereto on October 6, 2023, Amendment No. 36 thereto on November 9, 2023, Amendment No. 37 thereto on December 14, 2023, Amendment No. 38 thereto on February 23, 2024, Amendment No. 39 thereto on July 9, 2024, Amendment No. 40 thereto on July 12, 2024, Amendment No. 41 thereto on July 24, 2024, Amendment No. 42 thereto on August 2, 2024, Amendment No. 43 thereto on August 15, 2024, Amendment No. 44 thereto on August 26, 2024, Amemndment No. 45 thereto on April 15, 2025, Amendment No. 46 thereto on May 20, 2025, Amendment No. 47 thereto on June 3, 2025, Amendment No. 48 thereto on June 10, 2025, Amendment No. 49 thereto on July 9, 2025, Amendment No. 50 thereto filed on July 22, 2025, Amendment No. 51 thereto filed on July 25, 2025 and Amendment No. 52 thereto filed on August 11, 2025 (as so amended, the "Schedule 13D"). This Amendment No. 53 thereto supplements and amends the statement on Schedule 13D. Terms defined in the Schedule 13D are used herein as so defined.
Item 2.	Identity and Background
(a)	This Schedule 13D is filed by and on behalf of (i) Abdiel Qualified Master Fund, LP; (ii) Abdiel Capital, LP; (iii) Abdiel Partners, LLC; (iv) Abdiel Capital Management, LLC; (v) Abdiel Capital Advisors, LP; and (vi) Colin T. Moran (each, a "Reporting Person" and collectively, the "Reporting Persons"). The agreement among the Reporting Persons to file jointly (the "Joint Filing Agreement") was filed as Exhibit A to the initial filing and an amendment to the Joint Filing Agreement was filed as Exhibit A to Amendment No. 34.
(b)	For each Reporting Person: 90 Park Avenue, 29th Floor New York, NY 10016
(c)	Each of Abdiel Qualified Master Fund, LP, Abdiel Capital, LP and Abdiel Partners, LLC is a private investment vehicle, the principal business of which is to make investments. The principal business of Abdiel Capital Management, LLC is to act as the general partner of Abdiel Qualified Master Fund, LP and Abdiel Capital, LP. The principal business of Abdiel Capital Advisors, LP is to act as the investment manager of Abdiel Qualified Master Fund, LP, Abdiel Capital, LP. and Abdiel Partners, LLC. Colin T. Moran serves as managing member of Abdiel Capital Management, LLC and Abdiel Capital Partners, LLC, which serves as the general partner of Abdiel Capital Advisors, LP. and managing member of Abdiel Partners, LLC.
(d)	For each Reporting Person: No
(e)	For each Reporting Person: No
(f)	Abdiel Qualified Master Fund, LP is a Cayman Islands limited partnership. Each of Abdiel Capital, LP and Abdiel Capital Advisors, LP is a Delaware limited partnership. Each of Abdiel Capital Management, LLC and Abdiel Partners, LLC is a Delaware limited liability company. Colin T. Moran is citizen of the United States.
Item 3.	Source and Amount of Funds or Other Consideration
	Not Applicable
Item 4.	Purpose of Transaction
	Not Applicable
Item 5.	Interest in Securities of the Issuer
(a)	The information requested by this paragraph is incorporated herein by reference to the cover pages to this Amendment No. 53 to Schedule 13D. Percentage ownership is based on 42,943,872 shares of Class A Common Stock outstanding as of August 4, 2025, as reported in the Issuer's Report on Form 10-Q for the period ended June 30, 2025 filed with the Securities and Exchange Commission on August 7, 2025.
(b)	The information requested by this paragraph is incorporated herein by reference to the cover pages to this Amendment No. 53 to Schedule 13D.
(c)	Information with respect to all transactions in the Class A Common Stock effected by the Reporting Persons since the filing of Amendment No. 52 to Schedule 13D is incorporated herein by reference to Exhibit A hereto.
(d)	Not Applicable
(e)	Not Applicable
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	Not Applicable
Item 7.	Material to be Filed as Exhibits.
	Exhibit A - Transactions Effected since the filing of Amendment No. 52 to Schedule 13D

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Abdiel Qualified Master Fund, LP

Signature:	/s/ Colin T. Moran
Name/Title:	Colin T. Moran, Managing Member of Abdiel Capital Management, LLC, its General Partner
Date:	08/14/2025

Abdiel Capital, LP

Signature:	/s/ Colin T. Moran
Name/Title:	Colin T. Moran, Managing Member of Abdiel Capital Management, LLC, its General Partner
Date:	08/14/2025

Abdiel Partners, LLC

Signature:	/s/ Colin T. Moran
Name/Title:	Colin T. Moran, Managing Member of Abdiel Capital Partners, LLC, its Managing Member
Date:	08/14/2025

Abdiel Capital Management, LLC

Signature:	/s/ Colin T. Moran
Name/Title:	Colin T. Moran, Managing Member
Date:	08/14/2025

Abdiel Capital Advisors, LP

Signature:	/s/ Colin T. Moran
Name/Title:	Colin T. Moran, Managing Member of Abdiel Capital Partners, LLC, its General Partner
Date:	08/14/2025

Colin T. Moran

Signature:	/s/ Colin T. Moran
Name/Title:	Colin T. Moran, individually
Date:	08/14/2025

FAQ

How many Appian (APPN) Class A shares do the Abdiel Reporting Persons beneficially own?

The Reporting Persons report beneficial ownership of 2,811,930 shares of Appian Class A common stock.

What percentage of APPN Class A stock does the Abdiel group own?

The combined holdings represent 6.6% of the reported Class A shares outstanding used in the filing.

Which Abdiel entities are named as Reporting Persons in the Schedule 13D/A for APPN?

The filing names Abdiel Qualified Master Fund, LP; Abdiel Capital, LP; Abdiel Partners, LLC; Abdiel Capital Management, LLC; Abdiel Capital Advisors, LP and Colin T. Moran.

Does the amendment state a purpose for the holdings or any arrangements with Appian?

No. Items addressing purpose and contracts/arrangements are marked Not Applicable in this amendment.

Where can I find details of transactions in APPN shares by the Reporting Persons?

The filing incorporates transactions since the prior amendment by reference to Exhibit A, which contains the transaction details.