Filed with the U.S. Securities and Exchange Commission on March 2, 2015

1933 Act Registration File No.   333-187194

1940 Act File No. 811-22811

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		[	X	]
Pre-Effective Amendment No.		[		]
Post-Effective Amendment No.	6	[	X	]

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		[	X	]
Amendment No.	8	[	X	]

(Check appropriate box or boxes.)

BRIDGE BUILDER TRUST

(Exact Name of Registrant as Specified in Charter)

615 East Michigan Street

Milwaukee, WI  53202

(Address of Principal Executive Offices, including Zip Code)

Registrant’s Telephone Number, including Area Code:  (414) 287-3700

Elaine E. Richards, Secretary

Bridge Builder Trust

c/o 2020 East Financial Way

Glendora, CA 91741

(Name and Address of Agent for Service)

Copy to:

Sean Graber, Esq.

Morgan, Lewis & Bockius LLP

1701 Market Street

Philadelphia, PA 19103

It is proposed that this filing will become effective (check appropriate box)

[		]	immediately upon filing pursuant to paragraph (b)
[	X	]	On April 2, 2015 pursuant to paragraph (b)
[		]	60 days after filing pursuant to paragraph (a)(1)
[		]	on (date) pursuant to paragraph (a)(1)
[		]	75 days after filing pursuant to paragraph (a)(2)
[		]	on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

[ X ] This post-effective amendment designates a new effective date for a previously filed post- effective amendment.

EXPLANATORY NOTE

Designation of New Effective Date for Previously Filed Amendment

Post-Effective Amendment No. 5 (the “Amendment”) was filed pursuant to Rule 485(a)(2) under the Securities Act of 1933 on December 18, 2014, and pursuant to Rule 485(a)(2) would become effective on March 3, 2015.

This Post-Effective Amendment No. 6 is being filed pursuant to Rule 485(b)(1)(iii) for the sole purpose of designating April 2, 2015 as the new date upon which the Amendment shall become effective.

This Post-Effective Amendment No. 6 incorporates by reference the information contained in Parts A, B and C of the Amendment.

SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment No. 6 to its Registration Statement on Form N-1A to be signed below on its behalf by the undersigned, duly authorized, in the City ofSt. Louis and State of Missouri on March 2, 2015.

BRIDGE BUILDER TRUST

By: /s/ William H. Broderick III*                                                                                      

      William H. Broderick III, Trustee

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 6 to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title	Date
William H. Broderick III*	Trustee	March 2, 2015
William H. Broderick III
Jean Carter*	Trustee	March 2, 2015
Jean Carter
William Fiala*	Trustee	March 2, 2015
William Fiala
Janice Innis-Thompson*	Trustee	March 2, 2015
Janice Innis-Thompson
William Scheffel*	Trustee	March 2, 2015
William Scheffel
John Tesoro*	Trustee	March 2, 2015
John Tesoro
Joseph C. Neuberger*	President and Principal	March 2, 2015
Joseph C. Neuberger	Executive Officer
Jason F. Hadler*	Treasurer and Principal	March 2, 2015
Jason F. Hadler	Financial Officer
By : /s/ Elaine E. Richards
Elaine E. Richards
*Attorney-in-fact pursuant to Powers of Attorney dated May 22, 2013 filed October 15, 2013.