Morgan Stanley announced it plans to sell a minority interest in its subsidiary, MSCI Inc., through an initial public offering of Class A common stock.

The IPO is expected to be completed by the end of 2007, subject to market conditions and receipt of regulatory approval. MSCI will file a preliminary registration statement with the U.S. Securities and Exchange Commission later today.

MSCI is a provider of investment decision support tools to equity, fixed income and multi-asset class investment institutions worldwide. These tools include the MSCI indices and the Barra portfolio risk analytics. Morgan Stanley currently owns 96.6% of the outstanding shares of MSCI; Capital Group International Inc. owns the remainder of the shares.

Morgan Stanley says that, while no final decision has been made at this time, it currently believes it would be beneficial to ultimately divest its remaining ownership interest in MSCI. However, that decision will be subject to market conditions and other factors.

John Mack, chairman and CEO of Morgan Stanley, said, “The initial public offering and potential separation of MSCI are consistent with Morgan Stanley’s strategy to focus our people, capital and resources on our core businesses, including institutional securities, asset management and global wealth management. We believe this transaction will unlock value for Morgan Stanley’s shareholders as well as release capital to redeploy into our core activities.”