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Earnings Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share |
Earnings Per Share | Note 8—Earnings Per Share ​ Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amphenol Corporation by the weighted average number of common shares outstanding. Diluted EPS is computed by dividing net income attributable to Amphenol Corporation by the weighted average number of outstanding common shares and dilutive common shares, the dilutive effect of which relates to stock options. A reconciliation of the basic weighted average common shares outstanding to diluted weighted average common shares outstanding for the years ended December 31, 2020, 2019 and 2018 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars and shares in millions, except per share data) |  | 2020 |  | 2019 |  | 2018
Net income attributable to Amphenol Corporation shareholders | ​ | $ | 1,203.4 | ​ | $ | 1,155.0 | ​ | $ | 1,205.0
Basic weighted average common shares outstanding | ​ |  | 298.0 | ​ |  | 297.5 | ​ |  | 301.2
Effect of dilutive stock options | ​ |  | 9.5 | ​ |  | 10.4 | ​ |  | 11.4
Diluted weighted average common shares outstanding | ​ |  | 307.5 | ​ |  | 307.9 | ​ |  | 312.6
Earnings per share attributable to Amphenol Corporation shareholders: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 4.04 | ​ | $ | 3.88 | ​ | $ | 4.00
Diluted | ​ | $ | 3.91 | ​ | $ | 3.75 | ​ | $ | 3.85
​ Excluded from the computations above were anti-dilutive common shares (primarily related to outstanding stock options) of 4.7 million, 7.1 million and 3.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. ​ Subsequent Event - Stock Split ​ On January 27, 2021, the Company announced that its Board of Directors approved a two-for-one split of the Company’s common stock. The stock split will be effected in the form of a stock dividend paid to shareholders of record as of the close of business on February 16, 2021. The Company expects the additional shares will be distributed on March 4, 2021. Below are the pro forma weighted average common shares outstanding and earnings per share (basic and diluted) to give the effect of this stock split as if it had been effective for all years presented. (table below is unaudited) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars and shares in millions, except per share data) |  | 2020 |  | 2019 |  | 2018
Net income attributable to Amphenol Corporation shareholders | ​ | $ | 1,203.4 | ​ | $ | 1,155.0 | ​ | $ | 1,205.0
Basic weighted average common shares outstanding | ​ |  | 596.1 | ​ |  | 595.0 | ​ |  | 602.4
Effect of dilutive stock options | ​ |  | 18.9 | ​ |  | 20.9 | ​ |  | 22.8
Diluted weighted average common shares outstanding | ​ |  | 615.0 | ​ |  | 615.9 | ​ |  | 625.2
Earnings per share attributable to Amphenol Corporation shareholders: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 2.02 | ​ | $ | 1.94 | ​ | $ | 2.00
Diluted | ​ | $ | 1.96 | ​ | $ | 1.88 | ​ | $ | 1.93
​ ​

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