X0609 4 2026-09-01 true 0001692427 NCS Multistage Holdings, Inc. NCSM 0001034196 ADVENT INTERNATIONAL, L.P. false PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON MA 02199 true 0001984045 ADVENT INTERNATIONAL GP, LLC false PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON MA 02199 true 0001692560 Advent-NCS Acquisition Limited Partnership false PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON MA 02199 true false Common Stock 2026-09-01 4 S 0 1478426 D 0 I See footnotes 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. The reported amount gives effect to a 1-for-20 reverse stock split on December 1, 2020. 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. ADVENT INTERNATIONAL, L.P., By: Advent International GP, LLC, its General Partner, By: /s/ Neil Crawford, Name: Neil Crawford, Title: Senior Director, Fund Administration 2026-09-01 ADVENT INTERNATIONAL GP, LLC, By: /s/ Neil Crawford, Name: Neil Crawford, Title: Senior Director, Fund Administration 2026-09-01 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 2026-09-01