Sec Form 4 Filing - Reddy Shyam K. @ BlueLinx Holdings Inc. - 2022-12-31

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 Reddy Shyam K. 2. Issuer Name and Ticker or Trading Symbol BlueLinx Holdings Inc. [ BXC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CHIEF LEGAL AND SUST. OFFICER (Last) (First) (Middle) 1950 SPECTRUM CIRCLE 3. Date of Earliest Transaction (MM/DD/YY) 12/31/2022 (Street) MARIETTA, GA30067 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 12/31/2022 M 21,821( 1 ) A 42,245 D Common Stock 12/31/2022 F 9,957( 3 ) D $ 71.11 32,288 D

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) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 2 ) 12/31/2022 M 21,821 ( 1 ) ( 1 ) Common Stock 21,821 $ 0 0 D Restricted Stock Units ( 2 ) 01/02/2023 A 4,745 ( 4 ) ( 4 ) Common Stock 4,745 $ 0 4,745 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Reddy Shyam K. 1950 SPECTRUM CIRCLE MARIETTA, GA30067 CHIEF LEGAL AND SUST. OFFICER Signatures /s/ Shyam K. Reddy 01/04/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents the conversion of restricted stock units that vested on December 31, 2022, pursuant to that certain Transition Agreement, dated September 29, 2022, between BlueLinx Holdings Inc (the "Company") and the Reporting Person. Vested shares will be delivered to the Reporting Person not later than 30 days after the vesting date. ( 2 )Each restricted stock unit represents a contingent right to receive one share of the Company's common stock. ( 3 )These shares were withheld to cover tax withholding obligations when 21,821 time-based restricted stock units vested on December 31, 2022. ( 4 )Represents restricted stock units granted to the Reporting Person pursuant to that certain Amended Transition Agreement, dated December 23, 2022, between the Company and the Reporting Person. These are time-based restricted stock units that vest in two installments, with the first installment of 2,372 restricted stock units vesting on March 31, 2023 and the second installment of 2,373 restricted stock units vesting on June 30, 2023. Vested shares will be delivered to the Reporting Person not later than 30 days after the vesting date.

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).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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