EXHIBIT 12(b)
SECTION 906 CERTIFICATIONS

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of
the undersigned officers of Nicholas-Applegate Institutional Funds
("registrant"), hereby  certify, to the best of our knowledge,
that the Registrant's Report on Form N-CSR for the period ended
9/30/05 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities and Exchange Act of 1934,
as applicable, and that the information contained in the Report
fairly presents, in all material respects, the financial condition
and results of operations of the Registrant.

Date: December 7, 2005

/s/ Horacio A. Valeiras

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Horacio A. Valeiras
Title: Chief Executive Officer and President




Dated: December 7, 2005

/s/ Thomas Muscarella

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Thomas Muscarella
Title: Chief Financial Officer and Treasurer

This certification is furnished pursuant to the requirements of
Form N-CSR and shall not be deemed "filed" for the purpose of
Section 18 of the Security Exchange Act of 1934, or otherwise
subject to the liability of that section, and shall not be deemed
to be incorporated by reference into any filing under the
Securities Act of 1933 or the Securities Exchange Act of 1934.