Item 1A. Risk Factors

The risks set forth in “Risk Factors” included in our 2020 Form 10-K could have a material adverse effect on our financial position, results of operations, or liquidity in a particular year or quarter, and could cause those results to differ materially from those expressed or implied in our forward-looking statements. Those risks remain unchanged and are incorporated herein by reference.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds


Period	(a) Total Number of Shares (or Units) Purchased (1)	(a) Total Number of Shares (or Units)		(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs (2)	(d) Maximum Number (or Approximate Dollar Value) of Shares (or Units) that may yet be purchased under the Plans or Programs (2)

July 1-31, 2021	1,083,372	$	262.34	1,081,820	13,896,044
August 1-31, 2021	1,267,526	260.88		1,267,526	12,628,518
September 1-30, 2021	1,300,073	246.32		1,300,073	11,328,445

Total	3,650,971			3,649,419

(1)Of this amount, 1,552 represent shares tendered by employees in connection with the exercise of options under the stockholder-approved Long-Term Incentive Plan.

(2)On September 26, 2017, our Board of Directors authorized the repurchase of up to an additional 50 million shares of Common Stock through December 31, 2022. As of September 30, 2021, 11.3 million shares remain authorized for repurchase.

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