Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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1. Name and Address of Reporting Person * ADVENT INTERNATIONAL, L.P. 2. Issuer Name and Ticker or Trading Symbol NCS Multistage Holdings, Inc. [NCSM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) PRUDENTIAL TOWER, 800 BOYLSTON STREET, SUITE 3300 3. Date of Earliest Transaction (Month/Day/Year) 09/01/2026 (Street) BOSTON, MA 02199 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 Common Stock 09/01/2026 S(1) 1,478,426(2) D (1) 0 I See footnotes(3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ADVENT INTERNATIONAL, L.P. PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON, MA 02199		X
ADVENT INTERNATIONAL GP, LLC PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON, MA 02199		X
Advent-NCS Acquisition Limited Partnership PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON, MA 02199		X

Signatures

ADVENT INTERNATIONAL, L.P., By: Advent International GP, LLC, its General Partner, By: /s/ Neil Crawford, Name: Neil Crawford, Title: Senior Director, Fund Administration		09/01/2026
**Signature of Reporting Person		Date
ADVENT INTERNATIONAL GP, LLC, By: /s/ Neil Crawford, Name: Neil Crawford, Title: Senior Director, Fund Administration		09/01/2026
**Signature of Reporting Person		Date
ADVENT-NCS ACQUISITION LIMITED PARTNERSHIP, By: Advent-NCS GP LLC, its General Partner, By: /s/ Neil Crawford, Name: Neil Crawford, Title: Senior Director, Fund Administration		09/01/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The reported securities were disposed of in connection with the consummation of a merger of the Issuer into a wholly-owned subsidiary of Weatherford International plc, for aggregate consideration of $19,666,839.72 in cash and 357,159 ordinary shares of Weatherford International plc.
(2)	The reported amount gives effect to a 1-for-20 reverse stock split on December 1, 2020.
(3)	The board of Advent International GP, LLC appoints the investment committee of Advent International, L.P. (together, "Advent" and the "Investment Committee," respectively). Such Investment Committee has voting and investment power with respect to the securities that were directly held by Advent-NCS Acquisition Limited Partnership on behalf of various funds and accounts managed by Advent (which may have been included on prior Statements filed with respect to the Issuer). Accordingly, Advent International, L.P. and Advent International GP, LLC may each be deemed to beneficially own the securities directly held by Advent-NCS Acquisition Limited Partnership. Each of the Reporting Persons disclaim such beneficial ownership, except to the extent of their respective pecuniary interest therein, if any, and this Statement shall not be deemed an admission of beneficial ownership of any of the reported securities for purposes of Section 16 or any other purpose.

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