Index provider MSCI Inc. (MSCI) is in advanced talks to acquire IPD Group Ltd., a London provider of real-estate performance analysis for funds, investors, managers and occupiers.

MSCI, a provider of stock indexes, portfolio-risk evaluation and performance data to mostly institutional investors, saw its shares plummet Tuesday after mutual-fund giant Vanguard Group said it would use a different yardstick for 22 of its index funds, starting in January. Vanguard said cost was the main factor behind its decision.

Competition is heating up in the lucrative index industry as exchange-traded funds, which often track a collection of shares or other financial instruments, continue to proliferate. Companies such as MSCI decide the components and the weight of those components in various indexes. Mutual-fund companies and ETF providers in turn pay index companies a fee, usually a small percentage of assets under management.

MSCI has worked to expand its offerings, most notably through its $1.55 billion acquisition of proxy adviser RiskMetricsGroup in 2010. But the company saw its second-quarter profit drop 18% on hefty restructuring charges and a decline in asset-based fees revenue.

MSCI said IPD has about 325 employees and generated revenue of 30.5 million pounds for the year ended June 30.

MSCI shares were recently trading 4% higher at $27.28.

Write to Melodie Warner at melodie.warner@dowjones.com

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