BLBD

SEC source: 0002094766-26-000006 · wk-form4_1789741529.xml · nonDerivative · entry 1

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,011

SEC source: 0002047774-26-000007 · wk-form4_1786636617.xml · nonDerivative · entry 1

Thau Daniel Mark · CIK 0002047774 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,046

SEC source: 0002047774-26-000004 · wk-form4_1779295603.xml · nonDerivative · entry 1

Thau Daniel Mark · CIK 0002047774 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,696

F1 · price: The price reported in Column 4 is a weighted average price at which shares were purchased in several open market transactions on May 19, 2026, at prices ranging from $65.05 to $65.11, inclusive. The reporting person undertakes to provide to Blue Bird Corporation, any security holder of Blue Bird Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

SEC source: 0002047774-26-000002 · wk-form4_1775156951.xml · nonDerivative · entry 1

Thau Daniel Mark · CIK 0002047774 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,396

F1 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F2 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0001625944-26-000002 · wk-form4_1775156442.xml · nonDerivative · entry 1

Blaufuss Mark · CIK 0001625944 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,334

F1 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F2 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0001486034-26-000002 · wk-form4_1775156488.xml · nonDerivative · entry 1

Fream Julie A · CIK 0001486034 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,705

F1 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F2 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0001626076-26-000005 · wk-form4_1775181372.xml · nonDerivative · entry 1

Penn Kevin S. · CIK 0001626076 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,396

F1 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F2 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0001980199-26-000002 · wk-form4_1775156705.xml · nonDerivative · entry 1

Newman Simon J · CIK 0001980199 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,334

F1 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F2 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0001894132-26-000002 · wk-form4_1775156642.xml · nonDerivative · entry 1

Hightower Edward T. · CIK 0001894132 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,396

F1 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F2 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0001626219-26-000006 · wk-form4_1775156600.xml · nonDerivative · entry 1

Grimm Douglas J. · CIK 0001626219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,764

F1 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F2 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0002127543-26-000005 · wk-form4_1775767314.xml · derivative · entry 3

Girardin Steve · CIK 0002127543 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 2,702,180

Underlying: Common Stock, par value $0.0001 per share · 2,702,180 shares

Expires not disclosed

F1 · price: The reported securities were acquired by Groupe Autobus Girardin Ltee, a corporation existing under the federal laws of Canada ("GAG"), in connection with the acquisition by the issuer of the remaining interest in its Micro Bird joint venture, as more fully described in the issuer's current report on Form 8-K filed with the Securities & Exchange Commission on April 2, 2026. The remaining interest in the Micro Bird joint venture was acquired from the sellers partly for $63,021,287 in cash and partly for (a) 2,702,180 Exchangeable Shares of MB Exchangeco Inc., a corporation existing under the laws of the Province of Ontario and a subsidiary of the issuer, and (b) 1 share of Special Voting Preferred Stock of the issuer.

F5 · derivative.exercise_date: The Exchangeable Shares are immediately exchangeable for shares of issuer's common stock, generally on a 1-for-1 basis, and while they do not expire, issuer, at its sole discretion, may force an exchange of any outstanding shares for shares of issuer's common stock after five years.

F5 · derivative.expiration_date: The Exchangeable Shares are immediately exchangeable for shares of issuer's common stock, generally on a 1-for-1 basis, and while they do not expire, issuer, at its sole discretion, may force an exchange of any outstanding shares for shares of issuer's common stock after five years.

F5 · derivative.underlying_shares: The Exchangeable Shares are immediately exchangeable for shares of issuer's common stock, generally on a 1-for-1 basis, and while they do not expire, issuer, at its sole discretion, may force an exchange of any outstanding shares for shares of issuer's common stock after five years.

F1 · ownership.nature: The reported securities were acquired by Groupe Autobus Girardin Ltee, a corporation existing under the federal laws of Canada ("GAG"), in connection with the acquisition by the issuer of the remaining interest in its Micro Bird joint venture, as more fully described in the issuer's current report on Form 8-K filed with the Securities & Exchange Commission on April 2, 2026. The remaining interest in the Micro Bird joint venture was acquired from the sellers partly for $63,021,287 in cash and partly for (a) 2,702,180 Exchangeable Shares of MB Exchangeco Inc., a corporation existing under the laws of the Province of Ontario and a subsidiary of the issuer, and (b) 1 share of Special Voting Preferred Stock of the issuer.

SEC source: 0002127543-26-000005 · wk-form4_1775767314.xml · nonDerivative · entry 2

Girardin Steve · CIK 0002127543 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,297

F3 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F4 · shares: The RSUs will vest on March 31, 2027; provided, however, that such RSUs will vest in full upon the occurrence of a "change in control" of the Company or if the reporting person's service terminates due to death, disability or due to completion of the reporting person's term of office as a director. Shares of common stock will be issued in settlement of the RSUs upon vesting and the earlier of the reporting person's compliance with the Company's applicable minimum stock ownership guidelines, termination of service as a director or a change in control event.

SEC source: 0002127543-26-000005 · wk-form4_1775767314.xml · nonDerivative · entry 1

Girardin Steve · CIK 0002127543 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 1

F1 · price: The reported securities were acquired by Groupe Autobus Girardin Ltee, a corporation existing under the federal laws of Canada ("GAG"), in connection with the acquisition by the issuer of the remaining interest in its Micro Bird joint venture, as more fully described in the issuer's current report on Form 8-K filed with the Securities & Exchange Commission on April 2, 2026. The remaining interest in the Micro Bird joint venture was acquired from the sellers partly for $63,021,287 in cash and partly for (a) 2,702,180 Exchangeable Shares of MB Exchangeco Inc., a corporation existing under the laws of the Province of Ontario and a subsidiary of the issuer, and (b) 1 share of Special Voting Preferred Stock of the issuer.

F2 · price: The Special Voting Preferred Stock share entitles the holder thereof to vote with the issuer's common stockholders and to cast the number of votes equal to the number of shares of the issuer's common stock that the Exchangeable Shares are exchangeable for. The reporting person may be deemed to have indirect beneficial ownership of such securities by virtue of his roles as a GAG shareholder, GAG manager and member of the GAG board of directors. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein.

F1 · ownership.nature: The reported securities were acquired by Groupe Autobus Girardin Ltee, a corporation existing under the federal laws of Canada ("GAG"), in connection with the acquisition by the issuer of the remaining interest in its Micro Bird joint venture, as more fully described in the issuer's current report on Form 8-K filed with the Securities & Exchange Commission on April 2, 2026. The remaining interest in the Micro Bird joint venture was acquired from the sellers partly for $63,021,287 in cash and partly for (a) 2,702,180 Exchangeable Shares of MB Exchangeco Inc., a corporation existing under the laws of the Province of Ontario and a subsidiary of the issuer, and (b) 1 share of Special Voting Preferred Stock of the issuer.

F2 · ownership.nature: The Special Voting Preferred Stock share entitles the holder thereof to vote with the issuer's common stockholders and to cast the number of votes equal to the number of shares of the issuer's common stock that the Exchangeable Shares are exchangeable for. The reporting person may be deemed to have indirect beneficial ownership of such securities by virtue of his roles as a GAG shareholder, GAG manager and member of the GAG board of directors. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein.

SEC source: 0002094766-26-000003 · wk-form4_1772725493.xml · derivative · entry 3

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.0001 per share · 5,192 shares

Expires 2032-12-12

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0002094766-26-000003 · wk-form4_1772725493.xml · nonDerivative · entry 2

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,011

F1 · price: The price reported in Column 4 is a weighted average price resulting from shares sold in multiple transactions on March 4, 2026, at prices ranging from $58.48 to $58.59, inclusive. The reporting person undertakes to provide to Blue Bird Corporation, any security holder of Blue Bird Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0002094766-26-000003 · wk-form4_1772725493.xml · nonDerivative · entry 1

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,203

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001884757-26-000004 · wk-form4_1771623069.xml · nonDerivative · entry 1

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,255

SEC source: 0001884757-25-000037 · wk-form4_1766004644.xml · derivative · entry 5

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.0001 · 3,503 shares

Expires 2032-12-12

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The final tranche of the stock option's three tranches vested on December 12, 2025.

SEC source: 0001884757-25-000037 · wk-form4_1766004644.xml · derivative · entry 4

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.0001 · 3,503 shares

Expires 2032-12-12

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001884757-25-000037 · wk-form4_1766004644.xml · nonDerivative · entry 3

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 46,180

F1 · price: The price reported in Column 4 is a weighted average price resulting from shares sold in multiple transactions on December 17, 2025, pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2025, at prices ranging from $51.55 to $51.64, inclusive. The reporting person undertakes to provide to Blue Bird Corporation, any security holder of Blue Bird Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001884757-25-000037 · wk-form4_1766004644.xml · nonDerivative · entry 2

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 53,186

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001884757-25-000037 · wk-form4_1766004644.xml · nonDerivative · entry 1

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 49,683

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001929771-25-000016 · wk-form4_1765912375.xml · nonDerivative · entry 1

Scartz Ted · CIK 0001929771 · SVP General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 59,910

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 12, 2025.

SEC source: 0001884757-25-000033 · wk-form4_1765912361.xml · nonDerivative · entry 1

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,180

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 12, 2025.

SEC source: 0001579477-25-000022 · wk-form4_1765912330.xml · nonDerivative · entry 2

Horlock Phil · CIK 0001579477 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 225,385

SEC source: 0001579477-25-000022 · wk-form4_1765912330.xml · nonDerivative · entry 1

Horlock Phil · CIK 0001579477 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 233,726

SEC source: 0002094766-25-000010 · wk-form4_1765912422.xml · nonDerivative · entry 1

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,011

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 12, 2025.

SEC source: 0001884757-25-000031 · wk-form4_1765406250.xml · nonDerivative · entry 1

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 49,087

F1 · price: The price reported in Column 4 is a weighted average price resulting from shares sold in multiple transactions on December 10, 2025, pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2025, at prices ranging from $50.01 to $50.99, inclusive. The reporting person undertakes to provide to Blue Bird Corporation, any security holder of Blue Bird Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001929771-25-000014 · wk-form4_1765315043.xml · nonDerivative · entry 1

Scartz Ted · CIK 0001929771 · SVP General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,536

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 6, 2025.

SEC source: 0001884757-25-000026 · wk-form4_1765315016.xml · nonDerivative · entry 1

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,071

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 6, 2025.

SEC source: 0002094766-25-000007 · wk-form4_1765315071.xml · nonDerivative · entry 1

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,560

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 6, 2025.

SEC source: 0002047774-25-000006 · wk-form4_1764944915.xml · nonDerivative · entry 1

Thau Daniel Mark · CIK 0002047774 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,099

SEC source: 0002055903-25-000003 · wk-form4_1764876738.xml · nonDerivative · entry 3

Wyskiel John · CIK 0002055903 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 136,419

F2 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F4 · shares: The RSUs vest on December 1, 2028, subject to downward adjustment based upon the actual percentage payout of the management performance bonus award for the Company's fiscal year ending September 30, 2028.

SEC source: 0002055903-25-000003 · wk-form4_1764876738.xml · nonDerivative · entry 2

Wyskiel John · CIK 0002055903 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 107,420

F2 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F3 · shares: The RSUs vest in three approximately equal tranches on each of December 1, 2026, December 1, 2027, and December 1, 2028.

SEC source: 0002055903-25-000003 · wk-form4_1764876738.xml · nonDerivative · entry 1

Wyskiel John · CIK 0002055903 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 88,088

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 2, 2025.

SEC source: 0001929771-25-000012 · wk-form4_1764876801.xml · nonDerivative · entry 3

Scartz Ted · CIK 0001929771 · SVP General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,417

F2 · acquired: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F4 · acquired: The RSUs vest on December 1, 2028, subject to downward adjustment based upon the actual percentage payout of the management performance bonus award for the Company's fiscal year ending September 30, 2028.

SEC source: 0001929771-25-000012 · wk-form4_1764876801.xml · nonDerivative · entry 2

Scartz Ted · CIK 0001929771 · SVP General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,336

F2 · acquired: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F3 · acquired: The RSUs vest in three approximately equal tranches on each of December 1, 2026, December 1, 2027, and December 1, 2028.

SEC source: 0001929771-25-000012 · wk-form4_1764876801.xml · nonDerivative · entry 1

Scartz Ted · CIK 0001929771 · SVP General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,949

F1 · acquired: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 2, 2025.

SEC source: 0001884757-25-000024 · wk-form4_1764876773.xml · nonDerivative · entry 3

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,358

F2 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F4 · shares: The RSUs vest on December 1, 2028, subject to downward adjustment based upon the actual percentage payout of the management performance bonus award for the Company's fiscal year ending September 30, 2028.

SEC source: 0001884757-25-000024 · wk-form4_1764876773.xml · nonDerivative · entry 2

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 47,044

F2 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F3 · shares: The RSUs vest in three approximately equal tranches on each of December 1, 2026, December 1, 2027, and December 1, 2028.

SEC source: 0001884757-25-000024 · wk-form4_1764876773.xml · nonDerivative · entry 1

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,168

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 2, 2025.

SEC source: 0002094766-25-000004 · wk-form4_1764876852.xml · nonDerivative · entry 3

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,313

F2 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F4 · shares: The RSUs vest on December 1, 2028, subject to downward adjustment based upon the actual percentage payout of the management performance bonus award for the Company's fiscal year ending September 30, 2028.

SEC source: 0002094766-25-000004 · wk-form4_1764876852.xml · nonDerivative · entry 2

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,159

F2 · shares: The award represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the common stock of Blue Bird Corporation.

F3 · shares: The RSUs vest in three approximately equal tranches on each of December 1, 2026, December 1, 2027, and December 1, 2028.

SEC source: 0002094766-25-000004 · wk-form4_1764876852.xml · nonDerivative · entry 1

Sanfrey Jeffrey Scott · CIK 0002094766 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,056

F1 · shares: This transaction represents shares withheld to satisfy payroll tax withholding obligations related to restricted stock units that vested on December 2, 2025.

SEC source: 0001579477-25-000020 · wk-form4_1757961951.xml · derivative · entry 3

Horlock Phil · CIK 0001579477 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $0.0001 per share · 13,578 shares

Expires 2026-12-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: Award represents stock option grants that were originally scheduled to vest over a three year period in equal installments (12/11/2020, 12/11/2021 and 12/11/2022), but for which vesting of the last two installments was accelerated to 10/31/2021 upon Mr. Horlock's initial retirement.

SEC source: 0001579477-25-000020 · wk-form4_1757961951.xml · nonDerivative · entry 2

Horlock Phil · CIK 0001579477 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 240,766

SEC source: 0001579477-25-000020 · wk-form4_1757961951.xml · nonDerivative · entry 1

Horlock Phil · CIK 0001579477 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 254,344

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001884757-25-000022 · wk-form4_1756907758.xml · nonDerivative · entry 1

Radulescu Razvan · CIK 0001884757 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,794

SEC source: 0001579477-25-000018 · wk-form4_1756826178.xml · derivative · entry 3

Horlock Phil · CIK 0001579477 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,578

Underlying: Common Stock, par value $0.0001 per share · 13,000 shares

Expires 2026-12-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: Award represents stock option grants that were originally scheduled to vest over a three year period in equal installments (12/11/2020, 12/11/2021 and 12/11/2022), but for which vesting of the last two installments was accelerated to 10/31/2021 upon Mr. Horlock's initial retirement.

SEC source: 0001579477-25-000018 · wk-form4_1756826178.xml · nonDerivative · entry 2

Horlock Phil · CIK 0001579477 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 240,766