X0306 4 2017-09-22 0 0001023731 8X8 INC /DE/ EGHT 0001085676 MARTIN BRYAN R C/O 8X8 INC 2125 O'NEL DRIVE SAN JOSE CA 95131 0 1 0 0 Chief Technology Officer Common Stock 2017-09-22 4 J 0 4402 13.3 A 966555 D Common Stock 2017-09-22 4 J 0 6473 13.3 A 973028 D Restricted Stock Unit 2017-09-22 4 J 0 4402 0 D 2019-09-22 Common Stock 4402 968626 D Restricted Stock Unit 2017-09-22 4 F 0 4880 0 D 2019-09-22 Common Stock 4880 963746 D Restricted Stock Unit 2017-09-22 4 J 0 6639 0 A 2017-09-22 2017-09-22 Common Stock 6639 970385 D Restricted Stock Unit 2017-09-22 4 J 0 6473 0 D 2018-09-22 Common Stock 6473 963912 D Restricted Stock Unit 2017-09-22 4 F 0 7176 0 D 2018-09-22 Common Stock 7176 956736 D 4,402 Restricted Stock Units became fully vested and have been converted to Common Stock. 6,473 Performance-based Restricted Stock Units became fully vested and have been converted to Common Stock. Each restricted stock unit represents a contingent right to receive one share of EGHT common stock. This award vests at the rate of one-fourth of such shares at September 22, 2016, one-fourth of such at September 22, 2017, one-fourth of such at September 22, 2018, and one-fourth of such at September 22, 2019. Payment of tax liability by withholding securities incident to vesting of restricted stock units. As previously reported on a Form 4, the reporting person was awarded 14,020 performance share units (PSUs) on September 22, 2015, of which 50% were eligible to vest on each of the second and third anniversaries of the award date. On September 22, 2017, the first installment of 7,010 PSUs vested at 194.71% of target, such that 13,649 shares became issuable. Of these shares, 6,473 were issued to the reporting person and the remaining 7,176 were withheld to pay the associated tax liability. The 6,639 units reported in Table II correspond to the additional shares issued in excess of 7,010 share target for the first vesting installment. RSUs vest (1) 50% on September 22, 2017 and (2) 50% on September 22, 2018, in each case subject to performance of 8x8's common stock relative to the Russell 2000 Index during the period from grant date through such vesting date. A 2x multiplier will be applied to the total shareholder returns (TSR) for each 1% of positive or negative relative TSR, and the number of shares earned will increase or decrease by 2% of the target number shown in table. In the event 8x8's common stock performance is below negative 30%, relative to the benchmark, no shares will be issued. Maximum number of shares issuable is two times the number shown in the table. /s/ Bryan R. Martin 2017-09-26