Stockholders' Equity	3 Months Ended
Mar. 31, 2021
Stockholders' Equity
Stockholders' Equity	12. Stockholders’ Equity Preferred Stock The Company has authorized 5.0 million shares of preferred stock, par value $0.01 per share. The Company’s certificate of incorporation provides that shares of preferred stock may be issued from time to time in one or more series. The Company’s Board of Directors is authorized to fix the voting rights, if any, designations, powers, preferences, qualifications, limitations and restrictions thereof, applicable to the shares of each series. The Company has authorized Series A Junior Participating Cumulative Preferred Stock, par value $0.01 per share. As of March 31, 2021 and December 31, 2020, there were no shares of Series A Junior Participating Cumulative Preferred Stock issued and outstanding. Common Stock and Warrants The Company has one class of common stock, par value $.01 per share. Each share of the Company’s common stock is entitled to one vote on all matters submitted to stockholders. In February 2021, the Company completed the previously announced sale of its common stock in connection with a strategic partnership with SK Holdings to accelerate the use of hydrogen as an alternative energy source in Asian markets. The Company sold 54,966,188 shares of its common stock to a subsidiary of SK Holdings at a purchase price of $29.2893 per share, or an aggregate purchase price of approximately $1.6 billion. In January and February 2021, the Company issued and sold in a registered equity offering an aggregate of 32.2 million shares of its common stock at a purchase price of $65.00 per share for net proceeds of approximately $1.8 billion. In November 2020, the Company issued and sold in a registered equity offering an aggregate of 43,700,000 shares of its common stock at a purchase price of $22.25 per share for net proceeds of approximately $927.3 million. In August 2020, the Company issued and sold in a registered equity offering an aggregate of 35,276,250 shares of its common stock at a purchase price of $10.25 per share for net proceeds of approximately $344.4 million. There were 566,385,952 and 458,051,920 shares of common stock outstanding as of March 31, 2021 and December 31, 2020, respectively. During 2017, warrants to purchase up to 110,573,392 shares of common stock were issued in connection with transaction agreements with Amazon and Walmart, as discussed in Note 13, “Warrant Transaction Agreements.” At both March 31, 2021 and December 31, 2020, a total of 68,380,913 warrants had vested. Warrants were exercised with respect to 5,819,652 shares during the fourth quarter of 2020. Warrants were exercised with respect to an additional 16,489,014 shares during the three months ended March 31, 2021. These warrants are measured at fair value at the time of grant or modification and are classified as equity instruments on the unaudited interim condensed consolidated balance sheets. At Market Issuance Sales Agreement On April 13, 2020, the Company entered into the at Market Issuance Sales agreement with B. Riley Financial (“B. Riley”) as sales agent, pursuant to which the Company may offer and sell, from time to time through B. Riley, shares of Company common stock having an aggregate offering price of up to $75.0 million. As of the date of this filing, the Company has not issued any shares of common stock pursuant to the at Market Issuance Sales agreement.

Stockholders' Equity

3 Months Ended

Mar. 31, 2021

12. Stockholders’ Equity

Preferred Stock

The Company has authorized 5.0 million shares of preferred stock, par value $0.01 per share. The Company’s certificate of incorporation provides that shares of preferred stock may be issued from time to time in one or more series. The Company’s Board of Directors is authorized to fix the voting rights, if any, designations, powers, preferences, qualifications, limitations and restrictions thereof, applicable to the shares of each series.

The Company has authorized Series A Junior Participating Cumulative Preferred Stock, par value $0.01 per share. As of March 31, 2021 and December 31, 2020, there were no shares of Series A Junior Participating Cumulative Preferred Stock issued and outstanding.

Common Stock and Warrants

The Company has one class of common stock, par value $.01 per share. Each share of the Company’s common stock is entitled to one vote on all matters submitted to stockholders.

In February 2021, the Company completed the previously announced sale of its common stock in connection with a strategic partnership with SK Holdings to accelerate the use of hydrogen as an alternative energy source in Asian markets. The Company sold 54,966,188 shares of its common stock to a subsidiary of SK Holdings at a purchase price of $29.2893 per share, or an aggregate purchase price of approximately $1.6 billion.

In January and February 2021, the Company issued and sold in a registered equity offering an aggregate of 32.2 million shares of its common stock at a purchase price of $65.00 per share for net proceeds of approximately $1.8 billion.

In November 2020, the Company issued and sold in a registered equity offering an aggregate of 43,700,000 shares of its common stock at a purchase price of $22.25 per share for net proceeds of approximately $927.3 million.

In August 2020, the Company issued and sold in a registered equity offering an aggregate of 35,276,250 shares of its common stock at a purchase price of $10.25 per share for net proceeds of approximately $344.4 million.

There were 566,385,952 and 458,051,920 shares of common stock outstanding as of March 31, 2021 and December 31, 2020, respectively.

During 2017, warrants to purchase up to 110,573,392 shares of common stock were issued in connection with transaction agreements with Amazon and Walmart, as discussed in Note 13, “Warrant Transaction Agreements.” At both March 31, 2021 and December 31, 2020, a total of 68,380,913 warrants had vested. Warrants were exercised with respect to 5,819,652 shares during the fourth quarter of 2020. Warrants were exercised with respect to an additional 16,489,014 shares during the three months ended March 31, 2021. These warrants are measured at fair value at the time of grant or modification and are classified as equity instruments on the unaudited interim condensed consolidated balance sheets.

At Market Issuance Sales Agreement

On April 13, 2020, the Company entered into the at Market Issuance Sales agreement with B. Riley Financial (“B. Riley”) as sales agent, pursuant to which the Company may offer and sell, from time to time through B. Riley, shares of Company common stock having an aggregate offering price of up to $75.0 million. As of the date of this filing, the Company has not issued any shares of common stock pursuant to the at Market Issuance Sales agreement.