CIBC Asset Management Inc. (CIBC AM) Monday announced portfolio sub-advisor changes to further strengthen its lineup of international equity funds.

The changes will take effect on April 15.

New York City-based Pzena Investment Management, LLC has been appointed as a portfolio sub-advisor for Imperial International Equity Pool. Pzena joins existing sub-advisors American Century Investment Management, Inc., Causeway Capital Management LLC, CIBC AM, and Pyramis Global Advisors, who will continue to provide portfolio management services to the pool.

Pzena and Denver-based INTECH Investment Management LLC have been appointed as portfolio sub-advisors for Imperial Overseas Equity Pool. These firms join existing sub-advisors American Century, Causeway and Pyramis, who will continue to provide portfolio management services to the pool.

Causeway, American Century, INTECH and Pzena have been appointed as portfolio sub-advisors for Frontiers International Equity Pool. These firms join existing sub-advisor Walter Scott & Partners Limited, who will continue to provide portfolio management services to the pool.

Kansas City-based American Century has been appointed as portfolio sub-advisor for CIBC International Small Companies Fund. American Century is a premier investment management firm with an extensive and proven track record managing international small-cap equities.