X0306 4 2021-03-05 0 0001738827 KLX Energy Services Holdings, Inc. KLXE 0001194888 ROBERTSON CORBIN J JR 1415 LOUISIANA STREET, SUITE 2900 HOUSTON TX 77002 1 0 1 1 Member of 10% Owner Group Common stock 2021-03-05 4 A 0 2257 0.00 A 26793 D Common stock 517979 I See footnotes Common stock 77037 I See footnotes Common stock 30911 I See footnotes Common stock 279657 I See footnote Common stock 9690 I See footnote Quintana Energy Partners-QES Holdings, L.L.C. is controlled by Quintana Energy Partners, L.P. The general partner of Quintana Energy Partners, L.P., Quintana Energy Fund-FI, LP and Quintana Energy Fund-TE, LP is Quintana Capital Group, L.P. The sole general partner of Quintana Capital Group, L.P. is Quintana Capital Group GP Ltd. Corbin J. Robertson, Jr. may be deemed to be a beneficial owner of these shares due to his additional rights regarding the management of Quintana Capital Group GP Ltd. These shares are directly held by Quintana Energy Partners-QES Holdings, L.L.C. These shares are directly held by Quintana Energy Fund-TE, LP. These shares are directly held by Quintana Energy Fund-FI, LP. These shares are directly held by Robertson QES Investment LLC. The sole manager of Robertson QES Investment LLC is Corbin J. Robertson, Jr. These shares are directly held by QEP Management Co., L.P. The general partner of QEP Management Co., L.P. is QEP Management Co. GP, LLC. Corbin J. Robertson, Jr. may be deemed to be a beneficial owner of these shares due to his additional rights regarding the management of QEP Management Co. GP, LLC. Grant of restricted stock vesting one year from the date of grant. /s/ Max L. Bouthillette, attorney-in-fact for Corbin J. Robertson, Jr. 2021-03-09