MSCI Inc. agreed to sell its Institutional Shareholder Services Inc. unit to private-equity firm Vestar Capital Partners for $364 million, the third time the investor adviser has changed hands in seven years.

The sale comes amid a debate regarding the proxy firm's sway over governance in corporate America.

ISS is the largest provider of advice to public-company shareholders on how to vote on matters such as merger deals, executive pay and director elections. It also counsels companies themselves on their governance. Many big institutional investors, including pension and mutual funds, rely on ISS to help formulate their votes.

MSCI, mainly known for its financial indexes, acquired ISS in 2010 as part of its $1.8 billion purchase of RiskMetrics Group, which had paid $553 million for ISS in 2007. MSCI said in October that it was exploring "strategic alternatives" for the business.

Write to Tess Stynes at tess.stynes@wsj.com

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