Form 485BXT Putnam ETF Trust

As filed with the U.S. Securities and Exchange Commission on October 14, 2026

Securities Act File No. 333-253222

Investment Company Act File No. 811-23643

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. 49 [ X ]

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940 [ X ]

Amendment No. 50

PUTNAM ETF TRUST*

(Exact Name of Registrant as Specified in Charter)

100 Federal Street

Boston, MA 02110

(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code: (617) 292-1000

Name and address of agent for service: Copy to:

It is proposed that this filing will become effective:

[ ] immediately upon filing pursuant to paragraph (b)

[ X ] on November 13, 2026 pursuant to paragraph (b)

[ ] 60 days after filing pursuant to paragraph (a)(1)

[ ] on ______________ pursuant to paragraph (a)(1)

[ ] 75 days after filing pursuant to paragraph (a)(2)

[ ] on ______________ 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.

* This filing relates solely to Franklin Multisector Bond ETF. Information contained in the Registrant’s Registration Statement relating to any other series of the Registrant is neither amended nor superseded hereby.

PART A, PART B AND PART C

Pursuant to Rule 485(b)(1)(iii) of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 49 to the Registration Statement on Form N-1A (the “Registration Statement”) of Putnam ETF Trust (the “Registrant”) (File No. 333-253222), relating only to Franklin Multisector Bond ETF (the “Fund”), a series of the Registrant, is being filed for the sole purpose of designating November 13, 2026 as the new date upon which Post-Effective Amendment No. 38, as filed on July 9, 2026 (Accession No. 0001193125-26-299276), (“PEA 38”) shall become effective.

Accordingly, the Part A - Prospectus, Part B - Statement of Additional Information and Part C of the Fund, as filed in PEA 38, are incorporated by reference in their entirety into this filing.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”), and the Investment Company Act of 1940, as amended, the Registrant, Putnam ETF Trust, certifies that it meets all the requirements for effectiveness of this Post-Effective Amendment to the Registration Statement pursuant to Rule 485(b)(1)(iii) under the Securities Act and has duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, and The Commonwealth of Massachusetts on this 14th day of October, 2026.

PUTNAM ETF TRUST

Pursuant to the requirements of the Securities Act, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on this 14th day of October, 2026:

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