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

As filed with the Securities and Exchange Commission on June 11, 2026

Securities Act File No. 333-57793

Investment Company Act of 1940 File No. 811-08839

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

		THE SECURITIES ACT OF 1933		☒
		Post-Effective Amendment No. 339		☒

And

REGISTRATION STATEMENT

UNDER

		THE INVESTMENT COMPANY ACT OF 1940		☒
		Amendment No. 341		☒

SPDR^® SERIES TRUST

(Exact Name of Registrant as Specified in Charter)

One Congress Street

Boston, Massachusetts 02114

(Address of Principal Executive Offices)

Registrant's Telephone Number: (617) 664-1465

Andrew J. DeLorme, Esq.

Chief Legal Officer

c/o SSGA Funds Management, Inc.

One Congress Street

Boston, Massachusetts 02114

(Name and Address of Agent for Service)

Copies to:

W. John McGuire, Esq.

Morgan, Lewis & Bockius LLP

1111 Pennsylvania Avenue, NW

Washington, DC 20004

It is proposed that this filing will become effective:

☐	immediately upon filing pursuant to Rule 485, paragraph (b)

☒	on June 26, 2026 pursuant to Rule 485, paragraph (b)

☐	60 days after filing pursuant to Rule 485, paragraph (a)(1)

☐	on _________________ pursuant to Rule 485, paragraph (a)(1)

☐	75 days after filing pursuant to Rule 485, paragraph (a)(2)

☐	on _________________ pursuant to Rule 485, paragraph (a)(2)

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

NOTE: This Post-Effective Amendment No. 331 to the Registrant's Registration Statement on Form N-1A is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act of 1933, as amended (the "Securities Act"), solely for the purpose of delaying, until June 26, 2026, the effectiveness of Post-Effective Amendment No. 335 to the Registrant's Registration Statement on Form N-1A, with respect to the State Street^® S&P 500^® Index Fund - Institutional Shares, which was filed pursuant to Rule 485(a) under the Securities Act on April 14, 2026 (the "Amendment").

Part A. INFORMATION REQUIRED IN A PROSPECTUS

Part A is incorporated by reference to Part A of the Amendment.

Part B. INFORMATION REQUIRED IN A STATEMENT OF ADDITIONAL INFORMATION

Part B is incorporated by reference to Part B of the Amendment.

Part C. OTHER INFORMATION

Part C is incorporated by reference to Part 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, SPDR^® Series Trust, the Registrant, certifies that it meets all the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b)(1)(iii) under the Securities Act of 1933, as amended, and has duly caused this Amendment to the Registration Statement to be signed on its behalf by the undersigned, thereunder duly authorized, in the City of Boston and the Commonwealth of Massachusetts on the 11^th day of June, 2026.

SIGNATURES

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:

SIGNATURES		TITLE		DATE
/s/ Carolyn M. Clancy* Carolyn M. Clancy		Trustee		June 11, 2026
/s/ Dwight D. Churchill* Dwight D. Churchill		Trustee		June 11, 2026
/s/ Clare S. Richer* Clare S. Richer		Trustee		June 11, 2026
/s/ Kristi L. Rowsell* Kristi L. Rowsell		Trustee		June 11, 2026
/s/ Sandra G. Sponem* Sandra G. Sponem		Trustee		June 11, 2026
/s/ Carl G. Verboncoeur* Carl G. Verboncoeur		Trustee		June 11, 2026
/s/ Jeanne LaPorta* Jeanne LaPorta		Trustee		June 11, 2026
/s/ James E. Ross* James E. Ross		Trustee		June 11, 2026
/s/ Ann M. Carpenter Ann M. Carpenter		President and Principal Executive Officer		June 11, 2026
/s/ Bruce S. Rosenberg Bruce S. Rosenberg		Treasurer and Principal Financial Officer (fulfills the role of Principal Accounting Officer)		June 11, 2026

*By:		/s/ Edmund Gerard Maiorana, Jr.
		Edmund Gerard Maiorana, Jr.
		As Attorney-in-Fact
		Pursuant to Power of Attorney