Sec Form 4 Filing - Bancroft Thomas @ Wesco Aircraft Holdings, Inc - 2019-12-31

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Bancroft Thomas 2. Issuer Name and Ticker or Trading Symbol Wesco Aircraft Holdings, Inc [ WAIR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O WESCO AIRCRAFT HOLDINGS, INC., 24911 AVENUE STANFORD 3. Date of Earliest Transaction (MM/DD/YY) 12/31/2019 (Street) VALENCIA, CA91355 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 12/31/2019 J( 1 ) 1,956,070 D 5,002,180 I See Footnote ( 2 ) Common Stock 29,859 I See Footnote ( 3 ) Common Stock 35,533 I See Footnote ( 4 ) Common Stock 49,200 I See Footnote ( 5 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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) (Ins tr. 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 Bancroft Thomas C/O WESCO AIRCRAFT HOLDINGS, INC. 24911 AVENUE STANFORD VALENCIA, CA91355 X Signatures Thomas M. Bancroft, by: /s/ John G. Holland, as Attorney-in-Fact 01/02/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On December 31, 2019, Makaira Indica, L.P., an investment fund managed by Makaira Partners LLC, made a liquidating distribution in kind of 1,956,070 shares of Common Stock. Makaira Partners LLC ceased to have beneficial ownership for purposes of Sections 13 and 16 of the Exchange Act of 1,956,070 shares of Common Stock as a result of such distribution. ( 2 )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. ( 3 )By Mr. Bancroft. Mr. Bancroft is the Managing Member, Portfolio Manager and Chief Investment Officer of Makaira Partners LLC. ( 4 )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. ( 5 )By Mr. Bancroft's IRA.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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