X0306 4 2017-08-25 0 0001378718 Wesco Aircraft Holdings, Inc WAIR 0001540866 Makaira Partners LLC 7776 IVANHOE AVENUE #250 LA JOLLA CA 92037 0 0 1 0 0001634599 Bancroft Thomas C/O WESCO AIRCRAFT HOLDINGS, INC. 24911 AVENUE STANFORD VALENCIA CA 91355 1 0 1 0 Common Stock 2017-08-25 4 P 0 10679 8.00 A 10105313 I See footnote Common Stock 2017-08-28 4 P 0 16505 8.0998 A 10121818 I See footnote Common Stock 2017-08-29 4 P 0 52000 8.0531 A 10173818 I See footnote Common Stock 13487 I See footnote Common Stock 15433 I See footnote Common Stock 49200 I See footnote By Makaira Partners LLC. Thomas Bancroft is the Managing Member, Portfolio Manager and Chief Investment Officer of Makaira Partners LLC. Mr. Bancroft disclaims beneficial ownership for purposes of Section 16 of the Exchange Act of all securities reported herein, except to the extent of his pecuniary interest therein. The price reported is a weighted average price. These shares were purchased in multiple transactions at per share prices ranging from $8.075 to $8.10. The Reporting Persons undertake to provide the Company, any security holder of the Company or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. The price reported is a weighted average price. These shares were purchased in multiple transactions at per share prices ranging from $7.975 to $8.10. The Reporting Persons undertake to provide the Company, any security holder of the Company or the staff of the SEC, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. By Mr. Bancroft. Mr. Bancroft is the Managing Member, Portfolio Manager and Chief Investment Officer of Makaira Partners LLC. Makaira Partners LLC disclaims beneficial ownership of such shares and disclaims membership in a group with Mr. Bancroft. By family members of Mr. Bancroft. Mr. Bancroft disclaims beneficial ownership for purposes of Section 16 of the Exchange Act of all securities reported herein, except to the extent of his pecuniary interest therein. Makaira Partners LLC disclaims beneficial ownership of such shares and disclaims membership in a group with Mr. Bancroft. By Mr. Bancroft's IRA. Makaira Partners LLC disclaims beneficial ownership of such shares and disclaims membership in a group with Mr. Bancroft. Makaira Partners LLC, by: /s/ Sean Hidey, Chief Operating Officer and Chief Compliance Officer 2017-08-29 Thomas Bancroft, by: /s/ John G. Holland, as Attorney-in-Fact 2017-08-29