13D Filing: Coliseum Capital and Blue Bird Corp (BLBD)

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Ownership Summary Table

Name Sole Voting Power Shared Voting Power Sole Dispositive Power Shared Dispositive Power Aggregate Amount Owned Power Percent of Class
Coliseum Capital Management 0 1,861,377 0 1,861,377 1,861,377 7.7%
Coliseum Capital 0 1,538,408 0 1,538,408 1,538,408 6.3%
Coliseum School Bus Holdings 0 862,811 0 862,811 862,811 3.5%
Coliseum Capital Partners 0 1,363,574 0 1,363,574 1,363,574 5.6%
Coliseum Capital Partners II 0 174,834 0 174,834 174,834 0.7%
Adam Gray 0 1,861,377 0 1,861,377 1,861,377 7.7%
Christopher Shackelton 0 1,861,377 0 1,861,377 1,861,377 7.7%

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Page 1 of 11 – SEC Filing

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE
13D/A

Under the Securities Exchange Act of 1934*

(Amendment No. 4)

Blue Bird
Corporation

(Name of Issuer)

Common Stock, par value $0.0001 per share (Common Shares)

(Title of Class of Securities)

095306106

(CUSIP Number)

Christopher Shackelton/Adam Gray

105 Rowayton Ave.

Rowayton, CT 06853

(Name,
Address and Telephone Number of Person Authorized to Receive Notices and Communications)

June 16, 2017

(Date of Event Which Requires Filing of this Statement)

If the filing person has
previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of sections 240.13d-1(e), 240.13d-1(f) or 140.13d-1(g), check the following box.  ☐

* The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information
which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities
Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 1 of 11

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Page 2 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)
  1.

Names of
Reporting Persons.

Coliseum Capital Management, LLC

  2.

Check the Appropriate Box if a Member
of a Group (See Instructions)

(a)  ☐        (b)  ☒

  3.

SEC Use Only

  4.

Source of Funds (See Instructions)

AF

  5.

Check if Disclosure of Legal
Proceedings Is Required Pursuant to Items 2(d) or 2(e)

  6.

Citizenship or Place of
Organization

Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

  7.

Sole Voting Power

0

  8.

Shared Voting Power

1,861,377 (1)

  9.

Sole Dispositive Power

0

10.

Shared Dispositive Power

1,861,377 (1)

11.

Aggregate Amount Beneficially Owned by Each Reporting Person

1,861,377 (1)

12.

Check if the Aggregate Amount in Row
(11) Excludes Certain Shares (See Instructions)

13.

Percent of Class Represented by Amount
in Row (11)

7.7% (1)

14.

Type of Reporting Person (See
Instructions)

IA

(1) Includes (a) 862,811 Common Shares that could be obtained upon conversion of 100,000 of the Issuers 7.625% Series A Convertible Cumulative Preferred Stock (the Series A Shares) held directly by
Coliseum School Bus Holdings, LLC and (b) 256,000 Common Shares that could be obtained upon conversion of 512,000 warrants of the Issuer (the Warrants).

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Page 3 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)
  1.

Names of
Reporting Persons.

Coliseum Capital, LLC

  2.

Check the Appropriate Box if a Member
of a Group (See Instructions)

(a)  ☐        (b)  ☒

  3.

SEC Use Only

  4.

Source of Funds (See Instructions)

AF

  5.

Check if Disclosure of Legal
Proceedings Is Required Pursuant to Items 2(d) or 2(e)

  6.

Citizenship or Place of
Organization

Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

  7.

Sole Voting Power

0

  8.

Shared Voting Power

1,538,408 (1)

  9.

Sole Dispositive Power

0

10.

Shared Dispositive Power

1,538,408 (1)

11.

Aggregate Amount Beneficially Owned by Each Reporting Person

1,538,408 (1)

12.

Check if the Aggregate Amount in Row
(11) Excludes Certain Shares (See Instructions)

13.

Percent of Class Represented by Amount
in Row (11)

6.3% (1)

14.

Type of Reporting Person (See
Instructions)

OO

(1) Includes (a) 689,386 Common Shares that could be obtained upon conversion of 79,900 Series A Shares held directly by Coliseum School Bus Holdings, LLC and (b) 198,148 Common Shares that could be obtained upon
conversion of 396,295 Warrants.

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Page 4 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)
  1.

Names of
Reporting Persons.

Coliseum School Bus Holdings, LLC

  2.

Check the Appropriate Box if a Member
of a Group (See Instructions)

(a)  ☐        (b)  ☒

  3.

SEC Use Only

  4.

Source of Funds (See Instructions)

AF

  5.

Check if Disclosure of Legal
Proceedings Is Required Pursuant to Items 2(d) or 2(e)

  6.

Citizenship or Place of
Organization

Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

  7.

Sole Voting Power

0

  8.

Shared Voting Power

862,811 (1)

  9.

Sole Dispositive Power

0

10.

Shared Dispositive Power

862,811 (1)

11.

Aggregate Amount Beneficially Owned by Each Reporting Person

862,811 (1)

12.

Check if the Aggregate Amount in Row
(11) Excludes Certain Shares (See Instructions)

13.

Percent of Class Represented by Amount
in Row (11)

3.5% (1)

14.

Type of Reporting Person (See
Instructions)

OO

(1) Consists of Common Shares that could be obtained upon conversion of 100,000 Series A Shares held directly by Coliseum School Bus Holdings, LLC.

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Page 5 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)
  1.

Names of
Reporting Persons.

Coliseum Capital Partners, L.P.

  2.

Check the Appropriate Box if a Member
of a Group (See Instructions)

(a)  ☐        (b)  ☒

  3.

SEC Use Only

  4.

Source of Funds (See Instructions)

WC

  5.

Check if Disclosure of Legal
Proceedings Is Required Pursuant to Items 2(d) or 2(e)

  6.

Citizenship or Place of
Organization

Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

  7.

Sole Voting Power

0

  8.

Shared Voting Power

1,363,574 (1)

  9.

Sole Dispositive Power

0

10.

Shared Dispositive Power

1,363,574 (1)

11.

Aggregate Amount Beneficially Owned by Each Reporting Person

1,363,574 (1)

12.

Check if the Aggregate Amount in Row
(11) Excludes Certain Shares (See Instructions)

13.

Percent of Class Represented by Amount
in Row (11)

5.6% (1)

14.

Type of Reporting Person (See
Instructions)

PN

(1) Includes (a) 582,398 Common Shares that could be obtained upon conversion of 67,500 Series A Shares held directly by Coliseum School Bus Holdings, LLC and (b) 155,253 Common Shares that could be obtained upon
conversion of 310,505 Warrants.

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Page 6 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)
  1.

Names of
Reporting Persons.

Coliseum Capital Partners II, L.P.

  2.

Check the Appropriate Box if a Member
of a Group (See Instructions)

(a)  ☐        (b)  ☒

  3.

SEC Use Only

  4.

Source of Funds (See Instructions)

WC

  5.

Check if Disclosure of Legal
Proceedings Is Required Pursuant to Items 2(d) or 2(e)

  6.

Citizenship or Place of
Organization

Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

  7.

Sole Voting Power

0

  8.

Shared Voting Power

174,834 (1)

  9.

Sole Dispositive Power

0

10.

Shared Dispositive Power

174,834 (1)

11.

Aggregate Amount Beneficially Owned by Each Reporting Person

174,834 (1)

12.

Check if the Aggregate Amount in Row
(11) Excludes Certain Shares (See Instructions)

13.

Percent of Class Represented by Amount
in Row (11)

0.7% (1)

14.

Type of Reporting Person (See
Instructions)

PN

(1) Includes (a) 106,988 Common Shares that could be obtained upon conversion of 12,400 Series A Shares held directly by Coliseum School Bus Holdings, LLC and (b) 42,895 Common Shares that could be obtained upon
conversion of 85,790 Warrants.

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Page 7 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)
  1.

Names of
Reporting Persons.

Adam Gray

  2.

Check the Appropriate Box if a Member
of a Group (See Instructions)

(a)  ☐        (b)  ☒

  3.

SEC Use Only

  4.

Source of Funds (See Instructions)

AF

  5.

Check if Disclosure of Legal
Proceedings Is Required Pursuant to Items 2(d) or 2(e)

  6.

Citizenship or Place of
Organization

United States

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

  7.

Sole Voting Power

0

  8.

Shared Voting Power

1,861,377 (1)

  9.

Sole Dispositive Power

0

10.

Shared Dispositive Power

1,861,377 (1)

11.

Aggregate Amount Beneficially Owned by Each Reporting Person

1,861,377 (1)

12.

Check if the Aggregate Amount in Row
(11) Excludes Certain Shares (See Instructions)

13.

Percent of Class Represented by Amount
in Row (11)

7.7% (1)

14.

Type of Reporting Person (See
Instructions)

IN

(1) Includes (a) 862,811 Common Shares that could be obtained upon conversion of 100,000 Series A Shares held directly by Coliseum School Bus Holdings, LLC and (b) 256,000 Common Shares that could be obtained upon
conversion of 512,000 Warrants.

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Page 8 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)
  1.

Names of
Reporting Persons.

Christopher Shackelton

  2.

Check the Appropriate Box if a Member
of a Group (See Instructions)

(a)  ☐        (b)  ☒

  3.

SEC Use Only

  4.

Source of Funds (See Instructions)

AF

  5.

Check if Disclosure of Legal
Proceedings Is Required Pursuant to Items 2(d) or 2(e)

  6.

Citizenship or Place of
Organization

United States

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

  7.

Sole Voting Power

0

  8.

Shared Voting Power

1,861,377 (1)

  9.

Sole Dispositive Power

0

10.

Shared Dispositive Power

1,861,377 (1)

11.

Aggregate Amount Beneficially Owned by Each Reporting Person

1,861,377 (1)

12.

Check if the Aggregate Amount in Row
(11) Excludes Certain Shares (See Instructions)

13.

Percent of Class Represented by Amount
in Row (11)

7.7% (1)

14.

Type of Reporting Person (See
Instructions)

IN

(1) Includes (a) 862,811 Common Shares that could be obtained upon conversion of 100,000 Series A Shares held directly by Coliseum School Bus Holdings, LLC and (b) 256,000 Common Shares that could be obtained upon
conversion of 512,000 Warrants.

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Page 9 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)

Explanatory Note: This Amendment No. 4 (this Amendment) to the Schedule 13D (the Initial
13D) filed by the Filers (as defined below) with the U.S. Securities and Exchange Commission (the Commission) on March 10, 2015, as amended and supplemented by Amendment No. 1 to the Initial 13D filed on February 16,
2017, Amendment No. 2 to the Initial 13D, filed on March 10, 2017, and Amendment No. 3 to the Initial 13D, filed on March 22, 2017, amends and supplements the items set forth herein.

As used in this statement, the term Filers collectively refers to:

Coliseum Capital Management, LLC, a Delaware limited liability company (CCM);
Coliseum Capital, LLC, a Delaware limited liability company (CC);
Coliseum School Bus Holdings, LLC, a Delaware limited liability company (CSB);
Coliseum Capital Partners, L.P., a Delaware limited partnership (CCP);
Coliseum Capital Partners II, L.P., a Delaware limited partnership (CCP2);
Adam Gray, a director of the Issuer (Gray); and
Christopher Shackelton (Shackelton).

Item 2. Identity and Background.

Item 2 is amended and supplemented as follows:

(b) The business address of the Filers is 105 Rowayton Avenue, Rowayton, CT 06853.

Item 5. Interest in
Securities of the Issuer.

Item 5 is amended and supplemented as follows:

The information relating to the beneficial ownership of shares of common stock, $0.0001 par value per share (the Common Shares) of Blue Bird
Corporation (the Issuer) by each of the Filers set forth in Rows 7 through 13 of the cover pages hereto is incorporated herein by reference. The percentages set forth in Row 13 for all cover pages filed herewith are calculated based upon
23,701,274 of Common Shares outstanding as of May 8, 2017, as reported in the Issuers Quarterly Report on Form 10-Q for the quarterly period ended April 1, 2017, filed with the Commission on May 12, 2017.

The Filers effected the following transactions in the Common Stock in open market transactions on the dates indicated, and such transactions are the only
transactions in the Common Stock by the Filers in the sixty days preceding the filing of this Amendment to the Initial 13D.

Name

Purchase or Sale Date Number of Shares Weighted
Average Price
Per Share

CCP

Sale 05/16/2017 79,511 $ 18.80

CCP2

Sale 05/16/2017 20,269 $ 18.80

Separate Account

Sale 05/16/2017 28,589 $ 18.80

CCP

Sale 05/31/2017 15,631 $ 18.00

CCP2

Sale 05/31/2017 3,701 $ 18.00

Separate Account

Sale 05/31/2017 5,668 $ 18.00

CCP

Sale 06/02/2017 1,251 $ 18.20

CCP2

Sale 06/02/2017 296 $ 18.20

Separate Account

Sale 06/02/2017 453 $ 18.20

CCP

Sale 06/06/2017 1,251 $ 18.20

CCP2

Sale 06/06/2017 296 $ 18.20

Separate Account

Sale 06/06/2017 453 $ 18.20

CCP

Sale 06/07/2017 1,875 $ 18.30

CCP2

Sale 06/07/2017 445 $ 18.30

Separate Account

Sale 06/07/2017 680 $ 18.30

CCP

Sale 06/16/2017 137,312 $ 18.00

CCP2

Sale 06/16/2017 32,477 $ 18.00

Separate Account

Sale 06/16/2017 49,891 $ 18.00

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Page 10 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)

Except as set forth in Item 6 hereof, no other person has the right to receive or the power to direct the receipt of
dividends from, or the proceeds from the sale of, the Common Shares, the Issuers 7.625% Series A Convertible Cumulative Preferred Stock (the Series A Shares) or the Issuers warrants to purchase 0.5 common shares (the
Warrants) reported herein.

The information in Item 6 is incorporated herein by reference.

Item 6. Contracts, Arrangement, Understandings or Relationships with Respect to Securities of the Issuer.

CCM is an investment adviser whose clients, including CCP, CCP2 and the Separate Account, have the right to receive or the power to direct the receipt of
dividends from, or the proceeds from the sale of, the Common Shares, the Series A Shares and the Warrants. CC is the general partner of CCP and CCP2. Gray and Shackelton are the managers of CC and CCM. CCM may have the right to receive
performance-related fees from the Separate Account and CC may have the right to receive performance-related fees from CCP and CCP2.

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Page 11 of 11 – SEC Filing


CUSIP No. 095306106 (Common Stock)

SIGNATURES

After reasonable inquiry and to the best of my knowledge, I certify that the information set forth in this statement is true, complete and correct.

Dated: June 20, 2017

COLISEUM CAPITAL MANAGEMENT, LLC

By: /s/ Thomas
Sparta

COLISEUM CAPITAL, LLC

By: /s/ Thomas
Sparta

            Thomas Sparta, Attorney-in-fact

            Thomas Sparta, Attorney-in-fact

COLISEUM SCHOOL BUS HOLDINGS, LLC

By: Coliseum Capital Management, LLC, Manager

By: /s/ Thomas
Sparta

            Thomas Sparta, Attorney-in-fact

COLISEUM CAPITAL PARTNERS, L.P.

By: Coliseum Capital, LLC, General Partner

By: /s/ Thomas
Sparta

            Thomas Sparta,
Attorney-in-fact

COLISEUM CAPITAL PARTNERS II, L.P.

By: Coliseum Capital, LLC, General Partner

By: /s/ Thomas
Sparta

            Thomas Sparta, Attorney-in-fact

CHRISTOPHER SHACKELTON

By: /s/ Thomas
Sparta

            Thomas Sparta,
Attorney-in-fact

ADAM GRAY

By: /s/ Thomas
Sparta

            Thomas Sparta, Attorney-in-fact

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