Blue Bird Corp (Form: 4, Received: 02/22/2024 17:01:43)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
Common Stock	2/21/2024		S⁽¹⁾		4,042,650	D	$32.9	0 ⁽²⁾⁽³⁾	D ⁽²⁾⁽³⁾

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security
(Instr. 3)

2. Trans. Date

2A. Deemed Execution Date, if any

3. Trans. 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

Amount

(A) or (D)

Price

Common Stock

2/21/2024

S⁽¹⁾

4,042,650

$32.9

0 ⁽²⁾⁽³⁾

D ⁽²⁾⁽³⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivate Security
(Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Trans. Date

3A. Deemed Execution Date, if any

4. Trans. 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

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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Exhibit 99.1

Joint Filer Information

Name of Joint Filer:

Address:

Relationship of Joint Filer to Issuer:

Issuer Name and Ticker or Trading Symbol:

Date of Earliest Transaction Required to be Reported

(Month/Day/Year):

Designated Filer:

ASP BB Investco LP

c/o American Securities LLC

590 Madison Avenue, 38th Floor

New York, NY 10022

10% Owner

Blue Bird Corporation [BLBD]

February 22, 2024

ASP BB Holdings LLC

Name of Joint Filer:

Address:

Relationship of Joint Filer to Issuer:

Issuer Name and Ticker or Trading Symbol:

Date of Earliest Transaction Required to be Reported

(Month/Day/Year):

Designated Filer:

American Securities Partners VII, L.P.

c/o American Securities LLC

590 Madison Avenue, 38th Floor

New York, NY 10022

10% Owner

Blue Bird Corporation [BLBD]

February 22, 2024

ASP BB Holdings LLC

Name of Joint Filer:

Address:

Relationship of Joint Filer to Issuer:

Issuer Name and Ticker or Trading Symbol:

Date of Earliest Transaction Required to be Reported

(Month/Day/Year):

Designated Filer:

American Securities Partners VII(B), L.P.

c/o American Securities LLC

590 Madison Avenue, 38th Floor

New York, NY 10022

10% Owner

Blue Bird Corporation [BLBD]

February 22, 2024

ASP BB Holdings LLC

Name of Joint Filer:

Address:

Relationship of Joint Filer to Issuer:

Issuer Name and Ticker or Trading Symbol:

Date of Earliest Transaction Required to be Reported

(Month/Day/Year):

Designated Filer:

American Securities Partners VII(C), L.P.

c/o American Securities LLC

590 Madison Avenue, 38th Floor

New York, NY 10022

10% Owner

Blue Bird Corporation [BLBD]

February 22, 2024

ASP BB Holdings LLC

Name of Joint Filer:

Address:

Relationship of Joint Filer to Issuer:

Issuer Name and Ticker or Trading Symbol:

Date of Earliest Transaction Required to be Reported

(Month/Day/Year):

Designated Filer:

American Securities Associates VII, LLC

c/o American Securities LLC

590 Madison Avenue, 38th Floor

New York, NY 10022

10% Owner

Blue Bird Corporation [BLBD]

February 22, 2024

ASP BB Holdings LLC

Name of Joint Filer:

Address:

Relationship of Joint Filer to Issuer:

Issuer Name and Ticker or Trading Symbol:

Date of Earliest Transaction Required to be Reported

(Month/Day/Year):

Designated Filer:

American Securities LLC

590 Madison Avenue, 38th Floor

New York, NY 10022

10% Owner

Blue Bird Corporation [BLBD]

February 22, 2024

ASP BB Holdings LLC

FORM 4 ☐ Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). ☐ Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^* ASP BB Holdings LLC	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)
(Last) (First) (Middle) C/O AMERICAN SECURITIES LLC, 590 MADISON AVENUE, 38TH FLOOR	3. Date of Earliest Transaction (MM/DD/YYYY) 2/21/2024
(Street) NEW YORK, NY 10022	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _ X _ Form filed by More than One Reporting Person
(City) (State) (Zip)

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 $1,330,031.85 from the Issuer.
(2)	The shares were owned directly by ASP BB Holdings LLC and may also have been 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.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
ASP BB Holdings LLC C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK, NY 10022		X
ASP BB Investco LP C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK, NY 10022		X
American Securities Partners VII, L.P. C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK, NY 10022		X
American Securities Partners VII(B), L.P. C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK, NY 10022		X
American Securities Partners VII(C), L.P. C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK, NY 10022		X
American Securities Associates VII, LLC C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK, NY 10022		X
AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK, NY 10022		X

Signatures
ASP BB Holdings LLC By: /s/ Eric L. Schondorf, as Vice President and Secretary		2/22/2024
^**Signature of Reporting Person		Date
ASP BB Investco LP By: ASP Manager Corp., its general partner By: /s/ Eric L. Schondorf, as Vice President and Secretary		2/22/2024
^**Signature of Reporting Person		Date
American Securities Partners VII, L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member		2/22/2024
^**Signature of Reporting Person		Date
American Securities Partners VII(B), L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member		2/22/2024
^**Signature of Reporting Person		Date
American Securities Partners VII(C), L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member		2/22/2024
^**Signature of Reporting Person		Date
American Securities Associates VII, LLC By: /s/ Michael G. Fisch, as Managing Member		2/22/2024
^**Signature of Reporting Person		Date
American Securities LLC By: /s/ Michael G. Fisch, as President and Chief Executive Officer		2/22/2024
^**Signature of Reporting Person		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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