X0306 4 2018-02-15 0 0001038074 SILICON LABORATORIES INC SLAB 0001197848 BOCK WILLIAM G 400 WEST CESAR CHAVEZ AUSTIN TX 78701 1 0 0 0 Common Stock, $0.0001 par value 2018-02-15 4 S 0 2500 91.91 D 40926 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. Price represents the weighted average selling price. Prices range between $91.60 and $92.50. Saie-Yau Hui for William G. Bock 2018-02-16