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

As filed with the Securities and Exchange Commission on October 13, 2026.

Registration Nos. 333-209996
811-22736

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

Form N-1A
REGISTRATION STATEMENT

UNDER

and/or

REGISTRATION STATEMENT

(Check Appropriate Box or Boxes)

COLUMBIA ETF TRUST I

(Exact Name of Registrant as Specified in Charter)

290 Congress Street, Boston, Massachusetts 02210
(Address of Principal Executive Offices) (Zip Code)

Registrant's Telephone Number, Including Area Code: (800) 345-6611

 

Michael G. Clarke c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, Massachusetts 02210

Ryan C. Larrenaga, Esq. c/o Columbia Management Investment Advisers, LLC 290 Congress Street Boston, Massachusetts 02210

(Name and Address of Agents for Service)

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

☐  Immediately upon filing pursuant to paragraph (b)

☒  On November 2, 2026 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:

☒   This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Explanatory Note

This Post-Effective Amendment No. 56 to the Registrant's Registration Statement on Form N-1A is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 of the Securities Act of 1933, as amended (the "1933 Act"), solely for the purpose of delaying, until November 2. 2026, the effectiveness of the registration statement for Columbia Research Enhanced Core Deep Buffer ETF and Columbia Research Enhanced Core Moderate Buffer ETF, filed on July 31, 2026 in Post-Effective Amendment No. 55, pursuant to paragraph (a) of Rule 485 of the 1933 Act. No other series of the Registrant is affected by the filing. Parts A, B, and C of Registrant's Post-Effective Amendment No. 55, filed on July 31, 2026, are incorporated by reference.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant, COLUMBIA ETF TRUST I, 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 13th day of October, 2026. 

Columbia ETF Trust I
By:	/s/ Michael G. Clarke
	Michael G. Clarke President

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on the 13th day of October, 2026. 

Signature	Capacity	Signature	Capacity
/s/ Michael G. Clarke	President (Principal Executive Officer)	/s/ Douglas A. Hacker*	Trustee
Michael G. Clarke		Douglas A. Hacker
/s/ Charles H. Chiesa*	Chief Financial Officer and Principal Financial Officer	/s/ Amrit Kanwal*	Trustee
Charles H. Chiesa		Amrit Kanwal
/s/ Marybeth Pilat*	Treasurer, Chief Accounting Officer (Principal Accounting Officer)	/s/ Ryan C. Larrenaga*	Trustee
Marybeth Pilat		Ryan C. Larrenaga
/s/ Pamela G. Carlton*	Chair of the Board	/s/ Nancy T. Lukitsh*	Trustee
Pamela G. Carlton		Nancy T. Lukitsh
/s/ George S. Batejan*	Trustee	/s/ Jeninne C. McGee*	Trustee
George S. Batejan		Jeninne C. McGee
/s/ Kathleen A. Blatz*	Trustee	/s/ David M. Moffett*	Trustee
Kathleen A. Blatz		David M. Moffett
/s/ Janet Langford Carrig*	Trustee	/s/ Catherine James Paglia*	Trustee
Janet Langford Carrig		Catherine James Paglia
/s/ J. Kevin Connaughton*	Trustee	/s/ Natalie A. Trunow*	Trustee
J. Kevin Connaughton		Natalie A. Trunow
/s/ Olive M. Darragh*	Trustee	/s/ Sandra L. Yeager*	Trustee
Olive M. Darragh		Sandra L. Yeager
/s/ Brian J. Gallagher*	Trustee
Brian J. Gallagher

 

*	By: Name:	/s/ Joseph D'Alessandro
		Joseph D'Alessandro** Attorney-in-fact
**	Executed by Joseph D'Alessandro on behalf of Charles H. Chiesa pursuant to a Power of Attorney, dated September 5, 2025, on behalf of Marybeth Pilat pursuant to a Power of Attorney, dated January 2, 2020, on behalf of Ryan C. Larrenaga pursuant to a Trustee Power of Attorney, dated September 5, 2025, on behalf of Jeninne C. McGee pursuant to a Trustee Power of Attorney, dated July 29, 2025, on behalf of Amrit Kanwal pursuant to a Trustee Power of Attorney, dated March 1, 2026 and on behalf of each of the Trustees pursuant to a Trustees' Power of Attorney, dated March 1, 2025.

COLUMBIA ACORN TRUST

COLUMBIA FUNDS SERIES TRUST

COLUMBIA FUNDS SERIES TRUST I

COLUMBIA FUNDS SERIES TRUST II

COLUMBIA FUNDS VARIABLE INSURANCE TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST II

COLUMBIA ETF TRUST

COLUMBIA ETF TRUST I

COLUMBIA ETF TRUST II

WANGER ADVISORS TRUST

(each a "Registrant")

POWER OF ATTORNEY

Each of the undersigned constitutes and appoints Michael G. Clarke, Joseph D'Alessandro, Michael E. DeFao, Ryan C. Larrenaga, Brian D. McCabe, Christopher O. Petersen, and Megan E. Garcy, each individually, his or her true and lawful attorney-in-fact and agent (each an "Attorney-in-Fact") with power of substitution or resubstitution, in any and all capacities, including without limitation in the undersigned's capacity as a trustee of each Registrant, in the furtherance of the business and affairs of each Registrant: (i) to execute any and all instruments which said Attorney-in-Fact may deem necessary or advisable or which may be required to comply with the Securities Act of 1933, the Investment Company Act of 1940, the Securities Exchange Act of 1934 (together the "Acts") and any other applicable federal securities laws, or rules, regulations or requirements of the U.S. Securities and Exchange Commission ("SEC") in respect thereof, in connection with the filing and effectiveness of each Registrant's Registration Statement regarding the registration of each Registrant or its shares of beneficial interest, and any and all amendments thereto, including without limitation any reports, forms or other filings required by the Acts or any other applicable federal securities laws, or rules, regulations or requirements of the SEC; and (ii) to execute any and all federal, state or foreign regulatory or other required filings, including all applications with regulatory authorities, state charter or organizational documents and any amendments or supplements thereto, to be executed by, on behalf of, or for the benefit of, each Registrant. The undersigned hereby grants to each Attorney-in-Fact full power and authority to do and perform each and every act and thing contemplated above, as fully and to all intents and purposes as the undersigned might or could do in person, and hereby ratifies and confirms all that said Attorneys-in-Fact, individually or collectively, may lawfully do or cause to be done by virtue hereof.

This Power of Attorney shall not be revoked with respect to any undersigned trustee by any subsequent power of attorney the undersigned may execute unless such subsequent power of attorney specifically refers to this Power of Attorney or specifically states that the instrument is intended to revoke all prior general powers of attorney or all prior powers of attorney (and unless otherwise required by a provision of law that cannot be waived). This Power of Attorney shall terminate automatically with respect to a Registrant if the undersigned ceases to hold the above-referenced office of the Registrant.

Dated: March 1, 2025

[REMAINDER OF THIS PAGE IS LEFT BLANK INTENTIONALLY]

 

/s/ George S. Batejan	Trustee	/s/ Brian J. Gallagher	Trustee
George S. Batejan		Brian J. Gallagher
/s/ Daniel J. Beckman	Trustee	/s/ Douglas Hacker	Trustee
Daniel J. Beckman		Douglas Hacker
/s/ Kathleen A. Blatz	Trustee	/s/ Nancy T. Lukitsh	Trustee
Kathleen A. Blatz		Nancy T. Lukitsh
/s/ Pamela G. Carlton	Trustee	/s/ David M. Moffett	Trustee
Pamela G. Carlton		David M. Moffett
/s/ Janet Langford Carrig	Trustee	/s/ Catherine James Paglia	Trustee
Janet Langford Carrig		Catherine James Paglia
/s/ J. Kevin Connaughton	Trustee	/s/ Natalie A. Trunow	Trustee
J. Kevin Connaughton		Natalie A. Trunow
/s/ Olive M. Darragh	Trustee	/s/ Sandra L. Yeager	Trustee
Olive M. Darragh		Sandra L. Yeager
/s/ Patricia M. Flynn	Trustee
Patricia M. Flynn

COLUMBIA ACORN TRUST

COLUMBIA CREDIT INCOME OPPORTUNITIES FUND

COLUMBIA FUNDS SERIES TRUST

COLUMBIA FUNDS SERIES TRUST I

COLUMBIA FUNDS SERIES TRUST II

COLUMBIA FUNDS VARIABLE INSURANCE TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST II

COLUMBIA ETF TRUST

COLUMBIA ETF TRUST I

COLUMBIA ETF TRUST II

(each a "Registrant")

POWER OF ATTORNEY

The undersigned constitutes and appoints Michael G. Clarke, Joseph D'Alessandro, Michael E. DeFao, Brian D. McCabe and Christopher O. Petersen, each individually, his true and lawful attorney-in-fact and agent (each an "Attorney-in-Fact") with power of substitution or resubstitution, in any and all capacities, including without limitation in the undersigned's capacity as a trustee of each Registrant, in the furtherance of the business and affairs of each Registrant: (i) to execute any and all instruments which said Attorney-in-Fact may deem necessary or advisable or which may be required to comply with the Securities Act of 1933, the Investment Company Act of 1940, the Securities Exchange Act of 1934 (together the "Acts") and any other applicable federal securities laws, or rules, regulations or requirements of the U.S. Securities and Exchange Commission ("SEC") in respect thereof, in connection with the filing and effectiveness of each Registrant's Registration Statement regarding the registration of each Registrant or its shares of beneficial interest, and any and all amendments thereto, including without limitation any reports, forms or other filings required by the Acts or any other applicable federal securities laws, or rules, regulations or requirements of the SEC; and (ii) to execute any and all federal, state or foreign regulatory or other required filings, including all applications with regulatory authorities, state charter or organizational documents and any amendments or supplements thereto, to be executed by, on behalf of, or for the benefit of, each Registrant. The undersigned hereby grants to each Attorney-in-Fact full power and authority to do and perform each and every act and thing contemplated above, as fully and to all intents and purposes as the undersigned might or could do in person, and hereby ratifies and confirms all that said Attorneys-in-Fact, individually or collectively, may lawfully do or cause to be done by virtue hereof.

This Power of Attorney shall not be revoked with respect to the undersigned trustee by any subsequent power of attorney the undersigned may execute unless such subsequent power of attorney specifically refers to this Power of Attorney or specifically states that the instrument is intended to revoke all prior general powers of attorney or all prior powers of attorney (and unless otherwise required by a provision of law that cannot be waived). This Power of Attorney shall terminate automatically with respect to a Registrant if the undersigned ceases to hold the above-referenced office of the Registrant.

Dated: September 5, 2025
 

/s/ Ryan C. Larrenaga	Trustee
Ryan C. Larrenaga

COLUMBIA ACORN TRUST

COLUMBIA FUNDS SERIES TRUST

COLUMBIA FUNDS SERIES TRUST I

COLUMBIA FUNDS SERIES TRUST II

COLUMBIA FUNDS VARIABLE INSURANCE TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST II

COLUMBIA ETF TRUST

COLUMBIA ETF TRUST I

COLUMBIA ETF TRUST II

(each a "Registrant")

POWER OF ATTORNEY

The undersigned constitutes and appoints Michael G. Clarke, Joseph D'Alessandro, Michael E. DeFao, Ryan C. Larrenaga, Brian D. McCabe and Christopher O. Petersen, each individually, her true and lawful attorney-in-fact and agent (each an "Attorney-in-Fact") with power of substitution or resubstitution, in any and all capacities, including without limitation in the undersigned's capacity as a trustee of each Registrant, in the furtherance of the business and affairs of each Registrant: (i) to execute any and all instruments which said Attorney-in-Fact may deem necessary or advisable or which may be required to comply with the Securities Act of 1933, the Investment Company Act of 1940, the Securities Exchange Act of 1934 (together the "Acts") and any other applicable federal securities laws, or rules, regulations or requirements of the U.S. Securities and Exchange Commission ("SEC") in respect thereof, in connection with the filing and effectiveness of each Registrant's Registration Statement regarding the registration of each Registrant or its shares of beneficial interest, and any and all amendments thereto, including without limitation any reports, forms or other filings required by the Acts or any other applicable federal securities laws, or rules, regulations or requirements of the SEC; and (ii) to execute any and all federal, state or foreign regulatory or other required filings, including all applications with regulatory authorities, state charter or organizational documents and any amendments or supplements thereto, to be executed by, on behalf of, or for the benefit of, each Registrant. The undersigned hereby grants to each Attorney-in-Fact full power and authority to do and perform each and every act and thing contemplated above, as fully and to all intents and purposes as the undersigned might or could do in person, and hereby ratifies and confirms all that said Attorneys-in-Fact, individually or collectively, may lawfully do or cause to be done by virtue hereof.

This Power of Attorney shall not be revoked with respect to the undersigned trustee by any subsequent power of attorney the undersigned may execute unless such subsequent power of attorney specifically refers to this Power of Attorney or specifically states that the instrument is intended to revoke all prior general powers of attorney or all prior powers of attorney (and unless otherwise required by a provision of law that cannot be waived). This Power of Attorney shall terminate automatically with respect to a Registrant if the undersigned ceases to hold the above-referenced office of the Registrant.

Dated: July 29, 2025
 

/s/ Jeninne C. McGee	Trustee
Jeninne C. McGee

COLUMBIA ACORN TRUST

COLUMBIA FUNDS SERIES TRUST

COLUMBIA FUNDS SERIES TRUST I

COLUMBIA FUNDS SERIES TRUST II

COLUMBIA FUNDS VARIABLE INSURANCE TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST II

COLUMBIA ETF TRUST

COLUMBIA ETF TRUST I

COLUMBIA ETF TRUST II

(each a "Registrant")

POWER OF ATTORNEY

The undersigned constitutes and appoints Michael G. Clarke, Joseph D'Alessandro, Michael E. DeFao, Ryan C. Larrenaga, Brian D. McCabe and Christopher O. Petersen, each individually, his true and lawful attorney-in-fact and agent (each an "Attorney-in-Fact") with power of substitution or resubstitution, in any and all capacities, including without limitation in the undersigned's capacity as a trustee of each Registrant, in the furtherance of the business and affairs of each Registrant: (i) to execute any and all instruments which said Attorney-in-Fact may deem necessary or advisable or which may be required to comply with the Securities Act of 1933, the Investment Company Act of 1940, the Securities Exchange Act of 1934 (together the "Acts") and any other applicable federal securities laws, or rules, regulations or requirements of the U.S. Securities and Exchange Commission ("SEC") in respect thereof, in connection with the filing and effectiveness of each Registrant's Registration Statement regarding the registration of each Registrant or its shares of beneficial interest, and any and all amendments thereto, including without limitation any reports, forms or other filings required by the Acts or any other applicable federal securities laws, or rules, regulations or requirements of the SEC; and (ii) to execute any and all federal, state or foreign regulatory or other required filings, including all applications with regulatory authorities, state charter or organizational documents and any amendments or supplements thereto, to be executed by, on behalf of, or for the benefit of, each Registrant. The undersigned hereby grants to each Attorney-in-Fact full power and authority to do and perform each and every act and thing contemplated above, as fully and to all intents and purposes as the undersigned might or could do in person, and hereby ratifies and confirms all that said Attorneys-in-Fact, individually or collectively, may lawfully do or cause to be done by virtue hereof.

This Power of Attorney shall not be revoked with respect to the undersigned trustee by any subsequent power of attorney the undersigned may execute unless such subsequent power of attorney specifically refers to this Power of Attorney or specifically states that the instrument is intended to revoke all prior general powers of attorney or all prior powers of attorney (and unless otherwise required by a provision of law that cannot be waived). This Power of Attorney shall terminate automatically with respect to a Registrant if the undersigned ceases to hold the above-referenced office of the Registrant.

Dated: March 1, 2026
 

/s/ Amrit Kanwal	Trustee
Amrit Kanwal

COLUMBIA ACORN TRUST

COLUMBIA CREDIT INCOME OPPORTUNITIES FUND

COLUMBIA FUNDS SERIES TRUST

COLUMBIA FUNDS SERIES TRUST I

COLUMBIA FUNDS SERIES TRUST II

COLUMBIA FUNDS VARIABLE INSURANCE TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST

COLUMBIA FUNDS VARIABLE SERIES TRUST II

COLUMBIA ETF TRUST

COLUMBIA ETF TRUST I

COLUMBIA ETF TRUST II

COLUMBIA SELIGMAN PREMIUM TECHNOLOGY GROWTH FUND

TRI-CONTINENTAL CORPORATION

(each a "Registrant")

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint Michael G. Clarke, Joseph D'Alessandro, Michael E. DeFao, Ryan C. Larrenaga and Christopher O. Petersen, each individually, his true and lawful attorney-in-fact and agent (each an "Attorney-in-Fact") with power of substitution or resubstitution, in any and all capacities, including without limitation in the undersigned's capacity as Chief Financial Officer, Principal Financial Officer, Treasurer and Chief Accounting Officer of each Registrant, as applicable, in the furtherance of the business and affairs of each Registrant: (i) to execute any and all instruments which said Attorney-in-Fact may deem necessary or advisable or which may be required to comply with the Securities Act of 1933, the Investment Company Act of 1940, the Securities Exchange Act of 1934 (together the "Acts") and any other applicable federal securities laws, or rules, regulations or requirements of the U.S. Securities and Exchange Commission ("SEC") in respect thereof, in connection with the filing and effectiveness of each Registrant's Registration Statement regarding the registration of each Registrant or its shares of beneficial interest, and any and all amendments thereto, including without limitation any reports, forms or other filings required by the Acts or any other applicable federal securities laws, or rules, regulations or requirements of the SEC; and (ii) to execute any and all federal, state or foreign regulatory or other required filings, including all applications with regulatory authorities, state charter or organizational documents and any amendments or supplements thereto, to be executed by, on behalf of, or for the benefit of, each Registrant. The undersigned hereby grants to each Attorney-in-Fact full power and authority to do and perform each and every act and thing contemplated above, as fully and to all intents and purposes as the undersigned might or could do in person, and hereby ratifies and confirms all that said Attorneys-in-Fact, individually or collectively, may lawfully do or cause to be done by virtue hereof.

This Power of Attorney shall not be revoked by any subsequent power of attorney I may execute unless such subsequent power of attorney specifically refers to this Power of Attorney or specifically states that the instrument is intended to revoke all prior general powers of attorney or all prior powers of attorney (and unless otherwise required by a provision of law that cannot be waived). This Power of Attorney shall terminate automatically with respect to a Registrant if the undersigned ceases to hold the above-referenced office of the Registrant.

Dated: September 5, 2025

/s/ Charles H. Chiesa
Charles H. Chiesa

COLUMBIA ETF Trust

COLUMBIA ETF Trust I

COLUMBIA ETF TRUST II

(each a "Registrant")

POWER OF ATTORNEY

The undersigned does hereby constitute and appoint Michael G. Clarke, Joseph Beranek, Joseph D'Alessandro, Paul B. Goucher, Ryan C. Larrenaga, Christopher O. Petersen, Michael E. DeFao and Megan E. Garcy, each individually, her true and lawful attorney-in-fact and agent (each an "Attorney-in-Fact") with power of substitution or resubstitution, in any and all capacities, including without limitation in the undersigned's capacity as Treasurer, Chief Accounting Officer (Principal Accounting Officer), and Principal Financial Officer of each Registrant, in the furtherance of the business and affairs of each Registrant: (i) to execute any and all instruments which said Attorney-in-Fact may deem necessary or advisable or which may be required to comply with the Securities Act of 1933, the Investment Company Act of 1940, the Securities Exchange Act of 1934 (together the "Acts") and any other applicable federal securities laws, or rules, regulations or requirements of the U.S. Securities and Exchange Commission ("SEC") in respect thereof, in connection with the filing and effectiveness of each Registrant's Registration Statement regarding the registration of each Registrant or its shares of beneficial interest, and any and all amendments thereto, including without limitation any reports, forms or other filings required by the Acts or any other applicable federal securities laws, or rules, regulations or requirements of the SEC; and (ii) to execute any and all federal, state or foreign regulatory or other required filings, including all applications with regulatory authorities, state charter or organizational documents and any amendments or supplements thereto, to be executed by, on behalf of, or for the benefit of, each Registrant. The undersigned hereby grants to each Attorney-in-Fact full power and authority to do and perform each and every act and thing contemplated above, as fully and to all intents and purposes as the undersigned might or could do in person, and hereby ratifies and confirms all that said Attorneys-in-Fact, individually or collectively, may lawfully do or cause to be done by virtue hereof.

This Power of Attorney shall not be revoked by any subsequent power of attorney I may execute unless such subsequent power of attorney specifically refers to this Power of Attorney or specifically states that the instrument is intended to revoke all prior general powers of attorney or all prior powers of attorney (and unless otherwise required by a provision of law that cannot be waived). This Power of Attorney shall terminate automatically with respect to a Registrant if the undersigned ceases to hold the above-referenced office(s) of the Registrant.

Dated: January 2, 2020

/s/ Marybeth Pilat
Marybeth Pilat