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 3/31/07 (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: June 5, 2007

/s/ Horacio A. Valeiras

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Horacio A. Valeiras

Title: Chief Executive Officer and President

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 3/31/07 (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: June 5, 2007

/s/ Deborah A. Wussow

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Deborah A. Wussow

Title: Chief Financial Officer and Treasurer