ON SEMICONDUCTOR CORP — Director's Dealing 2011

Feb 4, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2009-09-08

Reporting Person: Williams Michael Andrew (SVP & GM, Auto & Pwr Grp)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2009-09-08	Common	M	10000.0000	$4.5200	Acquired	74817.9130	Direct
2009-09-08	Common	S	10000.0000	$8.5000	Disposed	64817.9130	Direct
2009-09-10	Common	M	20000.0000	$6.8300	Acquired	84817.9130	Direct
2009-09-10	Common	M	20000.0000	$5.9300	Acquired	104817.9130	Direct
2009-09-10	Common	M	9000.0000	$4.8000	Acquired	113817.9130	Direct
2009-09-10	Common	S	9000.0000	$8.7500	Disposed	104817.9130	Direct
2009-09-10	Common	S	40000.0000	$9.0000	Disposed	64817.9130	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2009-09-08	Stock Option (right to buy)	$4.5200	M	10000.0000	Disposed	2015-03-08	Common (10000.0000)	Direct
2009-09-10	Stock Option (right to buy)	$4.8000	M	9000.0000	Disposed	2015-02-17	Common (9000.0000)	Direct
2009-09-10	Stock Option (right to buy)	$5.9300	M	20000.0000	Disposed	2018-03-03	Common (20000.0000)	Direct
2009-09-10	Stock Option (right to buy)	$6.8300	M	20000.0000	Disposed	2016-03-23	Common (20000.0000)	Direct