Post-Effective Amendment to Post-Effective Amendment by Investment Company (Form 485BXT)

Filed with the U.S. Securities and Exchange Commission on November 13, 2026

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

and/or

REGISTRATION STATEMENT

UNDER

BRIDGE BUILDER TRUST

(Exact Name of Registrant as Specified in Charter)

12555 Manchester Road

St. Louis, MO 63131

(Address of Principal Executive Offices, including Zip Code)

Registrant's Telephone Number, including Area Code: (314) 515-2000

Evan Posner, Principal Executive Officer

Bridge Builder Trust

12555 Manchester Road

St. Louis, MO 63131

(Name and Address of Agent for Service)

Copy to:

Sean Graber, Esq.

Morgan, Lewis & Bockius LLP

2222 Market Street

Philadelphia, PA 19103

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

If appropriate, check the following box:

EXPLANATORY NOTE

This Post-Effective Amendment No. 67 is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act of 1933, as amended (the "1933 Act") solely to designate November 16, 2026 as the new effective date for Post-Effective Amendment No. 65, which was filed with the Securities and Exchange Commission (the "SEC") on September 1, 2026 pursuant to paragraph (a)(2) of Rule 485 under the 1933 Act (Accession No. 0001193125-26-378144) for the purpose of introducing the Bridge Builder Large Cap Fund (the "Fund"), a series of Bridge Builder Trust.

PART A - PROSPECTUS

The Prospectus for the Fund is incorporated herein by reference to Part A of Post-Effective Amendment No. 65.

PART B - STATEMENT OF ADDITIONAL INFORMATION

The Statement of Additional Information for the Fund is incorporated herein by reference to Part B of Post-Effective Amendment No. 65.

PART C - OTHER INFORMATION

Part C of this Post-Effective Amendment is incorporated herein by reference to Part C of Post-Effective Amendment No. 65.

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 pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Post-Effective Amendment No. 67 to the Registration Statement on Form N-1A to be signed on its behalf by the undersigned, duly authorized, in the City of St. Louis and State of Missouri, on the 13^th day of November, 2026.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 67 to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.