Form 485BXT Putnam ETF Trust

If appropriate, check the following box:

Title of Securities Being Registered:

Shares of the Putnam ESG Core Bond ETF, Putnam ESG High Yield ETF, Putnam ESG Ultra Short ETF, Putnam PanAgora ESG Emerging Markets Equity ETF and Putnam PanAgora ESG International Equity ETF

This Post-Effective Amendment No. 12 is being filed pursuant to Rule 485(b) under the Securities Act of 1933, as amended (the “Securities Act”), solely to designate January 18, 2023, as the new effective date for Post-Effective Amendment No. 4 filed pursuant to Rule 485(a) under the Securities Act on June 8, 2022. The effectiveness of Post-Effective Amendment No. 4 was previously delayed by Post-Effective Amendment No. 6, which was filed on August 18, 2022, Amendment No. 8 to the Trust’s Registration Statement under the 1940 Act, which was filed on September 19, 2022, Amendment No. 10 to the Trust’s Registration Statement under the 1940 Act, which was filed on October 19, 2022, and Post-Effective Amendment No. 11 to the Trust’s Registration Statement under the Securities Act which was filed on November 17, 2022. This Post-Effective Amendment No. 11 is not intended to amend or supersede any information contained in Post-Effective Amendment No. 4.

This Post-Effective Amendment relates solely to the Registrant’s Putnam ESG Core Bond ETF, Putnam ESG High Yield ETF, Putnam ESG Ultra Short ETF, Putnam PanAgora ESG Emerging Markets Equity ETF and Putnam PanAgora ESG International Equity ETF series. Information contained in the Registrant's Registration Statement relating to any other series of the Registrant is neither amended nor superseded hereby.

Part A. INFORMATION REQUIRED IN A PROSPECTUS

Part A is incorporated by reference to Part A of Post-Effective Amendment No. 4 to the Registration Statement on Form N-1A of Putnam ETF Trust (the “Registrant”) under the Securities Act of 1933, as amended, and Amendment No. 5 to the Registrant’s Registration Statement on Form N-1A under the Investment Company Act of 1940, as amended, filed with the Securities and Exchange Commission (the “SEC”) on June 8, 2022 (“Amendment No. 4/5”).

Part B. INFORMATION REQUIRED IN A STATEMENT OF ADDITIONAL INFORMATION

Part B is incorporated by reference to Part B of Amendment No. 4/5 to the Registrant’s Registration Statement on Form N-1A filed with the SEC on June 8, 2022.

Part C. OTHER INFORMATION

Part C is incorporated by reference to Part C of Amendment No. 4/5 to the Registrant’s Registration Statement on Form N-1A filed with the SEC on June 8, 2022.

                  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 of 1933, as amended, and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Boston, and The Commonwealth of Massachusetts, on the 19th day of December, 2022.

                  Pursuant to the requirements of the Securities Act of 1933, as amended, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated: