NOTE 18—NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS The following table reconciles basic and diluted weighted average common shares outstanding for the years ended December 31, 2020, 2019 and 2018 (in millions, except per share data): Potentially dilutive securities that were not included in the diluted net income (loss) per share computations because their effects would have been anti-dilutive were as follows (in millions): Year Ended December 31, 2020 2019 2018 Weighted average common shares outstanding: Basic 252.4  256.2  245.6  Dilutive unvested stock —  1.9  2.4  Diluted 252.4  258.1  248.0  Basic net income (loss) per share attributable to common stockholders $ (0.34) $ 2.53  $ 1.92  Diluted net income (loss) per share attributable to common stockholders $ (0.34) $ 2.51  $ 1.90  Year Ended December 31, 2020 2019 2018 Unvested stock (1) 3.4  2.3  0.8  Convertible notes 2021 Cheniere Convertible Unsecured Notes (2) —  13.7  13.0  2025 CCH HoldCo II Convertible Senior Notes (3) —  25.5  —  2045 Cheniere Convertible Senior Notes 4.5  4.5  4.5  Total potentially dilutive common shares 7.9  46.0  18.3  On June 3, 2019, we announced that our Board of Directors (“Board”) authorized a 3-year, $1.0 billion share repurchase program. The following table presents information with respect to repurchases of common stock during the years ended December 31, 2020 and 2019: NOTE 19—SHARE REPURCHASE PROGRAM 112 Year Ended December 31, 2020 2019 Aggregate common stock repurchased 2,875,376  4,000,424  Weighted average price paid per share $ 53.88  $ 62.27  Total amount paid (in millions) $ 155  $ 249  (1) Does not include 0.5 million shares, 0.5 million shares and 0.4 million shares for the years ended December 31, 2020, 2019 and 2018, respectively, of unvested stock because the performance conditions had not yet been satisfied as of the respective dates. (2) Since we have the intent and ability to settle the remaining outstanding principal amount of the 2021 Cheniere Convertible Unsecured Notes in cash and the excess conversion premium (the “conversion spread”) in either cash or shares, the treasury stock method was applied for calculating any potential dilutive effect of the conversion spread on net income per share for the year ended December 31, 2020. However, since the average market price of our common stock did not exceed the conversion price of our 2021 Cheniere Convertible Unsecured Notes, the conversion spread was excluded from the computation of diluted net income per share for the year ended December 31, 2020. (3) Since we redeemed the remaining principal amount of the 2025 CCH HoldCo II Convertible Senior Notes and the related premium in cash, as described in  Note 11—Debt , the 2025 CCH HoldCo II Convertible Senior Notes were not included in the computation of net income per share for the year ended December 31, 2020. There were no shares related to the conversion of the 2025 CCH HoldCo II Convertible Senior Notes included in the computation of diluted net income per share for the year ended December 31, 2018, because the substantive non-market based contingencies underlying the eligible conversion date were not met as of December 31, 2018. CHENIERE ENERGY, INC. AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—CONTINUED