Item 1A. Risk Factors

There have been no material changes in our risk factors since the February 23, 2021 filing of our Annual Report on Form 10-K for the year ended December 31, 2020.

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

In July 2021, we entered into a merger agreement to acquire Chilicon Power, LLC. As part of the funding of the purchase price, we issued 117,452 shares of restricted common stock to the shareholders of Chilicon Power, LLC that had a fair value of $36 million on the date of issuance. All of the shares are subject to restrictions on the transferability of the shares, which restrictions will lapse as to 30,640 shares on December 31, 2023. The remaining 86,812 shares are subject to forfeiture if certain product sales performance measures specified in the merger agreement are not achieved over a four and one-half year period, and the restrictions on the earned shares will lapse on December 31, 2025. We believe that the sale of the securities referenced was exempt from registration under the Securities Act of 1933 (the "Securities Act") by virtue of Section 4(a)(2) of the Securities Act as transactions not involving any public offering. 

The following table summarizes the stock repurchase activity for the three months ended September 30, 2021, which consisted of the withholding of shares upon the vesting of restricted stock awards to pay related withholding taxes on behalf of the recipient:

For equity compensation plan information, please refer to our Annual Report on Form 10-K for the year ended December 31, 2020. For information on the Company’s stock repurchase plans, refer to Note 12, “Stock Repurchase Program,” to the condensed consolidated financial statements included in Item 1 of this Quarterly Report on Form 10-Q.