MSCI Inc. Announces Public Offering of 3.3 million Shares of its Common Stock

NEW YORK--(Business Wire)--
MSCI Inc. (NYSE: MXB) announced today that it is commencing a registered public
offering of 3.3 million shares of its class A common stock, par value $0.01 per
share. MSCI Inc. also expects to grant the underwriters an option to purchase up
to 495,000 additional shares of class A common stock to cover over-allotments.
The offering is being made in conjunction with MSCI`s inclusion in the S&P
MidCap 400 Index after the market closes on November 5, 2009.

Net proceeds from the offering are expected to be used for general corporate
purposes, which may include the funding of strategic acquisitions or the
repayment of a portion of MSCI`s credit facility.

Morgan Stanley is serving as sole book-running manager for the offering.

MSCI has filed a registration statement (including a prospectus) with the SEC
for the offering to which this communication relates. Before you invest, you
should read the prospectus in that registration statement and other documents
MSCI has filed with the SEC for more complete information about MSCI and this
offering. You may obtain these documents for free by visiting EDGAR on the SEC
Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any
dealer participating in the offering will arrange to send you the prospectus and
the prospectus supplement if you request them by calling Morgan Stanley & Co.
Incorporated at (866) 718-1649

About MSCI Inc.

MSCI Inc. is a leading provider of investment decision support tools to
investment institutions worldwide. MSCI Inc. products include indices and
portfolio risk and performance analytics for use in managing equity, fixed
income and multi-asset class portfolios.

The company`s flagship products are the MSCI International Equity Indices, which
include over 120,000 indices calculated daily across more than 70 countries, and
the Barra risk models and portfolio analytics, which cover 56 equity and 46
fixed income markets. MSCI Inc. is headquartered in New York, with research and
commercial offices around the world. MXB#IR

MSCI Inc.
Lisa Monaco, 1-866-447-7874

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