Item 1A. Risk Factors

The occurrence of any of the significant risk factors described in Part 1, Item 1A in our Annual Report on Form 10-K for the year ended December 31, 2020 could materially affect us, including impacting our business, financial condition, results of operations, stock price or credit rating, as well as our reputation. These risks are not the only ones we face. We could also be materially adversely affected by other events, factors or uncertainties that are unknown to us, or that we do not currently consider to be significant.

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

(c) A summary of repurchases of our class A and class B common stock during the third quarter of 2021 is as follows (in millions, except per share amounts):

(1)Includes shares repurchased through our publicly announced share repurchase programs and shares tendered to pay the exercise price and tax withholding on employee stock options.

In May 2016, the Board of Directors approved a share repurchase authorization for $8.0 billion of class A and class B common stock. In August 2021, the Board of Directors terminated this authorization and approved a new share repurchase authorization for $5.0 billion. We repurchased 2.6 million shares of class B common stock for $500 million under an accelerated stock repurchase transaction during the three and nine months ended September 30, 2021. As of September 30, 2021, we had $4.5 billion available under this authorization.

For additional information on our share repurchase activities, see note 13 to the unaudited, consolidated financial statements included in this report.

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