SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* ASP BB Holdings LLC (Last) (First) (Middle) C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Blue Bird Corp [ BLBD ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 12/19/2023
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	12/19/2023		S(1)		2,500,000	D	$25.1	4,042,650(2)(3)	D(2)(3)

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

1. Name and Address of Reporting Person* ASP BB Holdings LLC (Last) (First) (Middle) C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* ASP BB Investco LP (Last) (First) (Middle) C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* American Securities Partners VII, L.P. (Last) (First) (Middle) C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* American Securities Partners VII(B), L.P. (Last) (First) (Middle) C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* American Securities Partners VII(C), L.P. (Last) (First) (Middle) C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* American Securities Associates VII, LLC (Last) (First) (Middle) C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* AMERICAN SECURITIES LLC (Last) (First) (Middle) 590 MADISON AVENUE, 38TH FLOOR (Street) NEW YORK NY 10022 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Sold by ASP BB Holdings LLC ("Holdings") in an underwritten registered public offering. In connection with such sale and in respect of certain fees, Holdings also received a payment of $627,500 from the Issuer.

2. The shares are owned directly by ASP BB Holdings LLC and may also be deemed to be indirectly beneficially owned by (i) ASP BB Investco LP, the sole member of Holdings ("Investco"), (ii) American Securities Partners VII, L.P., American Securities Partners VII(B), L.P. and American Securities Partners VII(C), L.P., the owners of partnership interests in Investco (each, a "Sponsor"), (iii) American Securities Associates VII, LLC, as general partner of the Sponsors ("GP"), and (iv) American Securities LLC, which provides investment advisory services to each Sponsor.

3. Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of such Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

Remarks:

Exhibit 99.1 (Joint Filer Information) is incorporated herein by reference.

	ASP BB Holdings LLC By: /s/ Eric L. Schondorf, as Vice President and Secretary	12/20/2023
	ASP BB Investco LP By: ASP Manager Corp., its general partner By: /s/ Eric L. Schondorf, as Vice President and Secretary	12/20/2023
	American Securities Partners VII, L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member	12/20/2023
	American Securities Partners VII(B), L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member	12/20/2023
	American Securities Partners VII(C), L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member	12/20/2023
	American Securities Associates VII, LLC By: /s/ Michael G. Fisch, as Managing Member	12/20/2023
	American Securities LLC By: /s/ Michael G. Fisch, as President and Chief Executive Officer	12/20/2023
	** Signature of Reporting Person	Date
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