Item 1A. RISK FACTORS

Not applicable.

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

We did not have any sales of unregistered securities for the three months ended December 31, 2022.

We purchase our own stock from time to time in conjunction with a number of activities, each of which is described in the following paragraphs. The following table presents information on our purchases of our own stock, on a monthly basis, for the three months ended December 31, 2022.

In December 2022, the Board of Directors authorized repurchase of our common stock in an aggregate amount of up to $1.5 billion, which replaced the previous authorization.

In the preceding table, the total number of shares purchased includes shares purchased pursuant to the Restricted Stock Trust Fund, which was established to acquire our common stock in the open market and used to settle RSUs granted as a retention vehicle for certain employees of our wholly-owned Canadian subsidiaries. For more information on this trust fund, see Note 2 of the Notes to Consolidated Financial Statements of our 2022 Form 10-K and Note 9 of the Notes to Condensed Consolidated Financial Statements of this Form 10-Q. These activities do not utilize the repurchase authorization presented in the preceding table.

The total number of shares purchased also includes shares repurchased as a result of employees surrendering shares as payment for option exercises or withholding taxes. These activities do not utilize the repurchase authorization presented in the preceding table.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.