X0508 4 2024-02-21 0001589526 Blue Bird Corp BLBD 0001676272 ASP BB Holdings LLC C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK NY 10022 true 0001676268 ASP BB Investco LP C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK NY 10022 true 0001616823 American Securities Partners VII, L.P. C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK NY 10022 true 0001616822 American Securities Partners VII(B), L.P. C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK NY 10022 true 0001616821 American Securities Partners VII(C), L.P. C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK NY 10022 true 0001676248 American Securities Associates VII, LLC C/O AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK NY 10022 true 0001475483 AMERICAN SECURITIES LLC 590 MADISON AVENUE, 38TH FLOOR NEW YORK NY 10022 true false Common Stock 2024-02-21 4 S 0 4042650 32.9 D 0 D 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. 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. 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. 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 2024-02-22 ASP BB Investco LP By: ASP Manager Corp., its general partner By: /s/ Eric L. Schondorf, as Vice President and Secretary 2024-02-22 American Securities Partners VII, L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member 2024-02-22 American Securities Partners VII(B), L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member 2024-02-22 American Securities Partners VII(C), L.P. By: American Securities Associates VII, LLC, its general partner By: /s/ Michael G. Fisch, as Managing Member 2024-02-22 American Securities Associates VII, LLC By: /s/ Michael G. Fisch, as Managing Member 2024-02-22 American Securities LLC By: /s/ Michael G. Fisch, as President and Chief Executive Officer 2024-02-22