Class A Common Stock

We may offer and sell shares of our Class A common stock from time to time, in one or more offerings, in amounts, at prices and on terms determined at the time of any such offering.

We will provide the specific prices and terms of our Class A common stock in one or more supplements to this prospectus at the time of offering. You should read this prospectus and the accompanying prospectus supplement carefully before you make your investment decision.

This prospectus may not be used to sell securities unless accompanied by a prospectus supplement.

We may offer our Class A common stock through underwriting syndicates managed or co-managed by one or more underwriters or dealers, through agents or directly to purchasers. Our Class A common stock also may be resold by selling securityholders. If required, the prospectus supplement for each offering of Class A common stock will describe the plan of distribution for that offering. For general information about the distribution of Class A common stock offered, see "Plan of Distribution" herein.

Our Class A common stock is traded on the New York Stock Exchange (the "NYSE") under the symbol "MC."