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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
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    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2026-08-27</ncom:dateSigned>
      <ncom:nameOfApplicant>VANGUARD INSTITUTIONAL INDEX FUNDS</ncom:nameOfApplicant>
      <ncom:signature>My Trieu-Gatt</ncom:signature>
      <ncom:signerName>My Trieu-Gatt</ncom:signerName>
      <ncom:title>Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
