X0609 4 2026-05-27 0 0001023731 8X8 INC /DE/ EGHT 0001956914 Kraus Kevin false C/O 8X8 INC 675 CREEKSIDE WAY CAMPBELL CA 95008 0 1 0 0 Chief Financial Officer 0 Common Stock 2026-05-27 4 A 0 74000 0 A 716529 D Common Stock 2026-05-27 4 F 0 37651 2.12 D 678878 D Common Stock 2026-05-27 4 A 0 45787 0 A 724665 D Common Stock 2026-05-27 4 F 0 23296 2.12 D 701369 D The reporting person was awarded 200,000 performance share units (PSUs) on September 15, 2024, which were eligible to vest in three equal installments based on achievement of each associated performance goal. On May 27, 2026, the second installment of 66,667 PSUs vested at 111% of target, such that 74,000 shares became issuable. Of these shares, 36,349 were issued to the reporting person and the remaining 37,651 were withheld to pay the associated tax liability. Represents the number of shares of Common Stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of the vested PSUs and does not represent a sale by the reporting person. The reporting person was awarded 123,750 performance share units (PSUs) on June 6, 2025, which were eligible to vest in three equal installments based on achievement of each associated performance goal. On May 27, 2026, the first installment of 41,250 PSUs vested at 111% of target, such that 45,787 shares became issuable. Of these shares, 22,491 were issued to the reporting person and the remaining 23,296 were withheld to pay the associated tax liability. /s/ Cheriese Dickman Attorney-in-Fact for Kevin Kraus 2026-05-29