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 March 31, 2023:

(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 authorized for repurchases under such program. Since the inception of the repurchase program, the Board has authorized us to repurchase up to $2.15 billion of our outstanding common stock. As of March 31, 2023, there remained authorization for us to repurchase approximately $373.7 million of our shares. No shares have been repurchased by us since the program was announced other than pursuant to such program. Refer to Note 10 - Common Stock of the notes to consolidated financial statements for further information regarding our share repurchase program.

(2)Excludes 32,383 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.

(3)Price paid per share includes any applicable broker commission as well as an estimate of the excise tax due resulting from our net share repurchases during the period. Estimates of excise tax may be subject to change in subsequent reporting periods, particularly if the amount of our share issuances exceed our share repurchases, thereby reducing the estimated excise tax due for the annual period.

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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