X0201 4 2004-01-27 0 0001038074 SILICON LABORATORIES INC SLAB 0001197847 ARTUSI DANIEL A 4635 BOSTON LANE AUSTIN TX 78735 1 1 0 0 President and CEO Common Stock, $0.0001 par value 2004-01-27 4 M 0 308 20.24 A 108251 D Common Stock, $0.0001 par value 2004-01-27 4 S 0 308 53.1 D 107943 D Common Stock, $0.0001 par value 2004-01-27 4 M 0 6358 20.24 A 114301 D Common Stock, $0.0001 par value 2004-01-27 4 S 0 6358 53.1 D 107943 D Incentive Stock Option (right to buy) 20.24 2004-01-27 4 M 0 308 0 D 2002-08-27 2011-08-27 Common Stock, $0.0001 par value 308 9559 D Non-Qualified Stock Option (right to buy) 20.24 2004-01-27 4 M 0 6358 0 D 2002-08-27 2011-08-27 Common Stock, $0.0001 par value 6358 197109 D Stock option exercise pursuant to reporting person's 10(b)5-1 plan. Shares sold pursuant to reporting person's 10(b)5-1 plan. Option first became exercisable on August 27, 2002. Option vests and becomes exercisable over a 60-month period with respect to (i) twenty percent (20%) of the option shares vest and become exercisable upon optionee's completion of one year of service measured from August 27, 2001 and (ii) the balance of the option shares vest and become exercisable in a series of forty-eight (48) successive equal monthly installments over the forty-eight (48) month period measured from the first year anniversary of August 27, 2001. Not applicable per instruction 4(c)(iii). Bruce A. Maurer, Power of Attorney for Daniel A. Artusi 2004-01-28