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Net Income Per Common Share | 12 Months Ended
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Dec. 31, 2021
Net Income per Common Share | N. NET INCOME PER COMMON SHARE The following table sets forth the computation of basic and diluted net income per common share:
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (in thousands, except per share amounts) |
Net income for basic and diluted net income per share |  | $ | 1,014,589 |  |  | $ | 784,147 |  |  | $ | 467,468 |
Weighted average common shares-basic |  |  | 164,960 |  |  |  | 166,120 |  |  |  | 170,425 |
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |  |
Convertible note hedge warrant shares (1) |  |  | 9,956 |  |  |  | 6,989 |  |  |  | 2,698 |
Incremental shares from assumed conversion of convertible notes (2) |  |  | 7,435 |  |  |  | 8,528 |  |  |  | 4,909 |
Restricted stock units |  |  | 1,180 |  |  |  | 1,264 |  |  |  | 1,236 |
Stock options |  |  | 86 |  |  |  | 131 |  |  |  | 178 |
Employee stock purchase rights |  |  | 8 |  |  |  | 10 |  |  |  | 13 |
Dilutive potential common shares |  |  | 18,665 |  |  |  | 16,922 |  |  |  | 9,034 |
Weighted average common shares-diluted |  |  | 183,625 |  |  |  | 183,042 |  |  |  | 179,459 |
Net income per common share-basic |  | $ | 6.15 |  |  | $ | 4.72 |  |  | $ | 2.74 |
Net income per common share-diluted |  | $ | 5.53 |  |  | $ | 4.28 |  |  | $ | 2.60 |
(1) | Convertible notes hedge warrant shares were calculated using the difference between the average Teradyne stock price for the period and the warrant price of $39.55, multiplied by 14.6 million shares. The result of this calculation, representing the total intrinsic value of the warrant, was divided by the average Teradyne stock price for the period.
(2) | Incremental shares from the assumed conversion of the convertible notes was calculated using the difference between the average Teradyne stock price for the period and the conversion price of $31.52, multiplied by 4.4 million shares. The result of this calculation, representing the total intrinsic value of the convertible debt, was divided by the average Teradyne stock price for the period.
The computation of diluted net income per common share for 2021 and 2020 excludes the effect of the potential exercise of stock options to purchase approximately 0.1 million shares and restricted stock units to purchase approximately 0.1 million shares because the effect would have been anti-dilutive.

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