Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Our common stock is listed and traded on the New York Stock Exchange under the symbol “OMC.” As of January 31, 2019, there were 2,014 registered holders of our common stock.

Common stock repurchases during the three months ended December 31, 2018 were:

During the three months ended December 31, 2018, we purchased 600,000 shares of our common stock in the open market for general corporate purposes and withheld 165,089 shares from employees to satisfy estimated statutory income tax obligations related to vesting of restricted stock awards and stock option exercises. The value of the common stock withheld was based on the closing price of our common stock on the applicable vesting or exercise date. There were no unregistered sales of equity securities during the three months ended December 31, 2018.

For information on securities authorized for issuance under our equity compensation plans, see Item 12, “Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters,” which relevant information will be included in our definitive proxy statement, which is expected to be filed with the SEC by April 10, 2019.