Item 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

The following table presents reported quarterly high and low per share sale prices of our common stock on the NYSE for the years 2017 and 2016.

On February 20, 2018, the closing price of our common stock was $139.24 per share as reported on the NYSE. As of February 20, 2018, we had 440,851,771 outstanding shares of common stock and 150 registered holders.

Dividends

As a REIT, we must annually distribute to our stockholders an amount equal to at least 90% of our REIT taxable income (determined before the deduction for distributed earnings and excluding any net capital gain). Generally, we have distributed and expect to continue to distribute all or substantially all of our REIT taxable income after taking into consideration our utilization of net operating losses (“NOLs”).

We had two series of preferred stock, the 5.25% Mandatory Convertible Preferred Stock, Series A (the “Series A Preferred Stock”), issued in May 2014, with a dividend rate of 5.25%, and the 5.50% Mandatory Convertible Preferred Stock, Series B (the “Series B Preferred Stock”), issued in March 2015, with a dividend rate of 5.50%. Dividends were payable quarterly in arrears, subject to declaration by our Board of Directors.

As of May 15, 2017, all shares of the Series A Preferred Stock converted into shares of our common stock. On May 15, 2017, we paid the final dividend of $7.9 million to holders of record of the Series A Preferred Stock at the close of business on May 1, 2017. As of February 15, 2018, all shares of the Series B Preferred Stock converted into shares of our common stock. On February 15, 2018, we paid the final dividend of $18.9 million to holders of record of the Series B Preferred Stock at the close of business on February 1, 2018.

The amount, timing and frequency of future distributions will be at the sole discretion of our Board of Directors and will depend upon various factors, a number of which may be beyond our control, including our financial condition and operating cash flows, the amount required to maintain our qualification for taxation as a REIT and reduce any income and excise taxes that we otherwise would be required to pay, limitations on distributions in our existing and future debt and preferred equity instruments, our ability to utilize NOLs to offset our distribution requirements, limitations on our ability to fund distributions using cash generated through our TRSs and other factors that our Board of Directors may deem relevant.

We have distributed an aggregate of approximately $4.3 billion to our common stockholders, including the dividend paid in January 2018.

During the year ended December 31, 2017, we declared the following cash distributions:

(1) For common stock, aggregate payment does not include amounts accrued for distributions payable related to unvested restricted stock units.

During the year ended December 31, 2016, we declared the following cash distributions:

(1) For common stock, aggregate payment does not include amounts accrued for distributions payable related to unvested restricted stock units.

Performance Graph

This performance graph is furnished and shall not be deemed ‘‘filed’’ with the SEC or subject to Section 18 of the Exchange Act, nor shall it be deemed incorporated by reference in any of our filings under the Securities Act of 1933, as amended.

The following graph compares the cumulative total stockholder return on our common stock with the cumulative total return of the S&P 500 Index, the Dow Jones U.S. Telecommunications Equipment Index and the FTSE Nareit All Equity REITs Index. The performance graph assumes that on December 31, 2012, $100 was invested in each of our common stock, the S&P 500 Index, the Dow Jones U.S. Telecommunications Equipment Index and the FTSE Nareit All Equity REITs Index. The

cumulative return shown in the graph assumes reinvestment of all dividends. The performance of our common stock reflected below is not necessarily indicative of future performance.

Issuer Purchases of Equity Securities

In March 2011, our Board of Directors approved a stock repurchase program, pursuant to which we are authorized to repurchase up to $1.5 billion of our common stock (the “2011 Buyback”). In addition to the 2011 Buyback, in December 2017, our Board of Directors approved an additional stock repurchase program, pursuant to which we are authorized to repurchase up to $2.0 billion of our common stock (the “2017 Buyback”).

During the three months ended December 31, 2017, we repurchased a total of 642,612 shares of our common stock for an aggregate of $89.4 million, including commissions and fees, pursuant to the 2011 Buyback. We had no repurchases under the 2017 Buyback. The table below sets forth details of our repurchases under the 2011 Buyback during the three months ended December 31, 2017.

We have repurchased a total of 12.4 million shares of our common stock under the 2011 Buyback for an aggregate of $1.2 billion, including commissions and fees. We expect to continue to manage the pacing of the remaining $344.8 million under the 2011 Buyback in response to general market conditions and other relevant factors. We expect to fund any further repurchases of our common stock through a combination of cash on hand, cash generated by operations and borrowings under our credit facilities. Purchases under the 2011 Buyback are subject to our having available cash to fund repurchases.