Form 485BXT VANGUARD INSTITUTIONAL
SECURITIES AND EXCHANGE COMMISSION
REGISTRATION STATEMENT
(NO. 33-34494)
(NO. 811-06093)
(Address of Principal Executive Office)
Registrant’s Telephone Number (610) 669-1000
P.O. Box 876
Valley Forge, PA 19482
Explanatory Note
This Post-Effective Amendment No. 85 under the Securities Act of 1933, as amended (the “Securities Act”) (Amendment No. 86 under the Investment Company Act of 1940, as amended (the “1940 Act”)) to the registration statement on Form N-1A (the “Registration Statement”) of Vanguard Institutional Index Funds (the “Trust”) is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act solely for the purpose of delaying, until March 8, 2024, the pending effective date of the Trust’s 84th Post-Effective Amendment. By way of further background:
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Post-Effective Amendment No. 83 was filed under Rule 485(b)(1)(iii) on December 14, 2023, for the sole purpose of delaying, until January 12, 2024, the pending effective date of the Trust’s 82nd Post-Effective Amendment. |
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Post-Effective Amendment No. 82 was filed under Rule 485(b)(1)(iii) on November 16, 2023, for the sole purpose of delaying, until December 15, 2023, the pending effective date of the Trust’s 81st Post-Effective Amendment. |
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Post-Effective Amendment No. 81 was filed under Rule 485(b)(1)(iii) on October 19, 2023, for the sole purpose of delaying, until November 17, 2023, the pending effective date of the Trust’s 80th Post-Effective Amendment. |
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Post-Effective Amendment No. 80 was filed under Rule 485(a)(2) on July 21, 2023, to register shares of Vanguard Extended Market Index Fund, a new series of the Trust (the “Acquiring Fund”), in connection with a reorganization of a predecessor fund (Vanguard Extended Market Index Fund, a series of Vanguard Index Funds) with and into the Acquiring Fund. The Acquiring Fund is identical in management to the predecessor fund, and the investment objective, strategies, and policies remain unchanged. Post-Effective Amendment No. 80 originally requested that the Amendment become effective on October 20, 2023. |
This Post-Effective Amendment No. 85 incorporates by reference the information contained in Parts A, B, and C of Post-Effective Amendment No. 80 to the Registrant’s Registration Statement.
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