Kodiak Sciences Inc. Notes to Consolidated Financial Statements (in thousands, except share and per share data) 105 Shares Subject to Repurchase The Company has a right of repurchase with respect to unvested shares issued upon early exercise of options at an amount equal to the lower of (1) the exercise price of each restricted share being repurchased and (2) the fair market value of such restricted share at the time the Company’s right of repurchase is exercised. The Company’s right to repurchase these shares lapses as those shares vest over the requisite service period. Shares purchased by employees pursuant to the early exercise of stock options are not deemed, for accounting purposes, to be issued until those shares vest according to their respective vesting schedules. Cash received for early exercised stock options is recorded as accrued liabilities and other current liabilities on the consolidated balance sheet and is reclassified to common stock and additional paid-in capital as such shares vest. At December 31, 2022, there were no early exercised stock options subject to the Company’s right of repurchase. 13. Net Loss per Common share The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders which excludes shares which are legally outstanding, but subject to repurchase by the Company (in thousands, except share and per share data): Year Ended December 31, 2022 2021 2020 Numerator: Net loss attributable to common stockholders.................... $ (333,823) $ (266,990) $ (133,096) Denominator: Weighted-average shares outstanding used in computing net loss per share attributable to common stockholders, basic and diluted......................... 52,249,620 51,788,918 45,741,845 Net loss per share attributable to common stockholders, basic and diluted.................................................................. $ (6.39) $ (5.16) $ (2.91) The following common share equivalents were excluded from the computation of diluted net loss per common share for the periods presented because their inclusion would have been antidilutive: As of December 31, 2022 2021 2020 Outstanding stock options.................................................. 16,542,107 14,523,917 6,897,276 Unvested restricted shares.................................................. 280,522 363,930 359,945 Total ................................................................................... 16,822,629 14,887,847 7,257,221 14. 401(k) Plan In 2011, the Company adopted a 401(k) retirement and savings plan covering all employees. The 401(k) plan allows employees to make pre- and post-tax contributions up to the maximum allowable amount set by the Internal Revenue Service. The 401(k) plan was amended to include an employer matching provision in 2019. The Company will make matching contributions of 100% of employee contributions up to a maximum of 50% of the individual maximum contribution limit allowed under the IRS rules. For the years ended December 31, 2022, 2021 and 2020, the expense related to the matching contributions was $0.9 million, $0.7 million and $0.6 million, respectively.