X0306 4 2018-02-15 0 0001038074 SILICON LABORATORIES INC SLAB 0001586469 Tolany Brandon 400 WEST CESAR CHAVEZ STREET AUSTIN TX 78701 0 1 0 0 SR VP of Worldwide Sales Common Stock, $0.0001 par value 2018-02-15 4 A 0 7916 0 A 59182 D Common Stock, $0.0001 par value 2018-02-15 4 F 0 5876 93.2 D 53306 D Reflects the grant of restricted stock units (RSUs) that will entitle Reporting Person to receive one (1) share of common stock per RSU. One-third of the RSUs will vest on each of the first three anniversaries of the date of grant, and will be settled pursuant to the terms of the Issuer's 2009 Stock Incentive Plan as amended and restated on April 20, 2017. Saie-Yau Hui for Brandon Tolany 2018-02-16