Item 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

The following table summarizes repurchases of our common stock made by us during the quarter ended September 30, 2021:

(1)In September 2011, our Board of Directors (the “Board”) authorized a share repurchase program allowing us to begin repurchasing shares of our outstanding common stock. Subsequently, the Board has from time to time increased the amount of our common stock that we may repurchase under such program. Since the inception of the repurchase program, the Board has authorized us to repurchase up to $1.15 billion of our outstanding common stock. As of September 30, 2021, there remained authorization for us to repurchase approximately $62.7 million of our shares. No shares have been repurchased by us since the program was announced other than pursuant to such program. Subsequent to September 30, 2021, the Board authorized us to repurchase up to an additional $300.0 million of our outstanding common stock. The repurchase program has no expiration date, does not obligate the Company to acquire any particular amount of common stock, and may be suspended, recommenced, or discontinued at any time or from time to time without prior notice. We may repurchase our shares from time to time to the extent permitted by securities laws and other legal requirements, including provisions in our credit agreement placing limitations on such repurchases.

(2)Excludes 2,126 shares surrendered to the Company by participants in our share-based compensation plans to satisfy minimum tax withholdings for common stock issued under such plans.

ITEM 4. MINE SAFETY DISCLOSURES.

Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank

Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR 229.104) is included in Exhibit 95.1 to this quarterly report.

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