X0306 4 2018-03-07 0 0001401708 NanoString Technologies Inc NSTG 0001575739 GRAY R BRADLEY 530 FAIRVIEW AVENUE N SEATTLE WA 98109 1 1 0 0 President and CEO Common Stock 2018-03-07 4 M 0 10000 A 136648 D Common Stock 2018-03-07 4 F 0 2435 6.54 D 134213 D Restricted Stock Units 2018-03-07 4 M 0 10000 0 D Common Stock 10000.0 20000 D Restricted stock units ("RSUs") convert into Common Stock on a one-for-one basis. The reported shares were withheld to cover the reporting person's tax liability in connection with the vesting of RSUs. The shares were not issued to or sold by the reporting person. Each RSU represents a contingent right to receive one (1) share of Issuer's common stock. On February 6, 2017, the reporting person was granted 30,000 RSUs, vesting in three equal installments beginning on the first market trading day following the first anniversary of March 6, 2017 (the "RSU Vesting Commencement Date") and 1/3 of the RSUs vest annually each year on the first market trading day after the second and third anniversary of the RSU Vesting Commencement Date. /s/ Shannon Atchison, Attorney in Fact 2018-03-08