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

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Our Class B Common Stock is traded on the New York Stock Exchange. Shares of our Class A, Class C and Class D Common Stock are not traded in any public market, but are each convertible into shares of our Class B Common Stock on a share-for-share basis.

The table below sets forth, for the quarters indicated, the high and low reported closing sales prices per share reported on the New York Stock Exchange for our Class B Common Stock for the years ended December 31, 2017 and 2016:

The number of stockholders of record as of January 31, 2017, were as follows:

Stock Repurchase Programs

In July, 2014, our Board of Directors authorized a stock repurchase program whereby, from time to time as conditions allow, we may spend up to $400 million to purchase shares of our Class B Common Stock on the open market at prevailing market prices or in negotiated private transactions. In February, 2016, our Board of Directors authorized a $400 million increase to our stock repurchase program, which increased the aggregate authorization to $800 million from the previous $400 million mentioned above. In November, 2017, our Board of Directors authorized an additional $400 million increase to our stock repurchase program, which increased the aggregate authorization to $1.2 billion from the previous $800 million authorization approved in 2016 and 2014 as mentioned above. There is no expiration date for our stock repurchase programs. As reflected below, during the three-month period ended December 31, 2017, we have repurchased approximately 1.0 million shares at an aggregate cost of approximately $100.8 million pursuant to the terms of our stock repurchase program. In addition, 193,806 shares were repurchased in connection with income tax withholding obligations resulting from the exercise of stock options and the vesting of restricted stock grants.

During the period of October 1, 2017 through December 31, 2017, we repurchased the following shares:

Dividends

During the two years ending December 31, 2017, dividends per share were declared and paid as follows:

Our Credit Agreement contains covenants that include limitations on, among other things, dividends and stock repurchases (see below in Capital Resources-Credit Facilities and Outstanding Debt Securities).

Equity Compensation

Refer to Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters, of this report for information regarding securities authorized for issuance under our equity compensation plans.

Stock Price Performance Graph

The following graph compares the cumulative total stockholder return on our common stock with the cumulative total return on the stock included in the Standard & Poor’s 500 Index and a Peer Group Index during the five year period ended December 31, 2017. The graph assumes an investment of $100 made in our common stock and each Index as of January 1, 2013 and has been weighted based on market capitalization. Note that our common stock price performance shown below should not be viewed as being indicative of future performance.

Companies in the peer group, which consist of companies in the S&P 500 Index or S&P MidCap 400 Index are as follows: Community Health Systems, Inc., Health Management Associates, Inc. (included until January, 2014 when it was acquired by Community Health Systems, Inc.), LifePoint Health, Inc., Tenet Healthcare Corporation, Acadia Healthcare Company, Inc. and HCA Healthcare, Inc.