X0508 4 2026-02-28 0001692427 NCS Multistage Holdings, Inc. NCSM 0001464457 WILLIAMS DEWAYNE C/O NCS MULTISTAGE HOLDINGS, INC. 19350 STATE HIGHWAY 249, SUITE 600 HOUSTON TX 77070 1 VP & Controller 0 Common Stock 2026-02-28 4 M 0 4535 0 A 9077 D Common Stock 2026-02-28 4 F 0 4535 39.84 D 4542 D Common Stock 2026-02-28 4 D 0 301 39.84 D 4241 D Common Stock 2026-03-03 4 A 0 1366 0 A 5607 D Equivalent Stock Units 2026-02-28 4 M 0 4535 0 D Common Stock 4535 3833 D Equivalent Stock Units 2026-03-03 4 A 0 1366 0 A Common Stock 1366 5199 D Equivalent stock units vested on February 28, 2026 and settled for cash. These shares were surrendered to satisfy the tax obligations related to the vesting of restricted stock units. Includes 1,180 restricted stock units which vest in two equal annual installments beginning on February 28, 2027 and 1,366 restricted stock units which vest in three equal annual installments beginning on February 28, 2027. These equivalent stock units settle in cash and represent the economic equivalent of one share of common stock, provided that the amount of cash settled for any equivalent stock unit will not exceed the maximum payout established by the Compensation, Nominating and Governance Committee. Includes 2,653 equivalent stock units which vest on February 28, 2027 and 1,180 equivalent stock units which vest in two equal annual installments beginning on February 28, 2027. Includes 2,653 equivalent stock units which vest on February 28, 2027, 1,180 equivalent stock units which vest in two equal annual installments beginning on February 28, 2027 and 1,366 equivalent stock units which vest in three equal annual installments beginning on February 28, 2027 /s/ Ori Lev, attorney-in-fact 2026-03-03