ON SEMICONDUCTOR CORP — Director's Dealing 2011

Jan 12, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2011-01-10

Reporting Person: Hall William (Sr VP & GM, Std Prod Grp)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-01-10	Common	M	70000.0000	$5.9800	Acquired	182038.0000	Direct
2011-01-10	Common	S	70000.0000	$11.0000	Disposed	112038.0000	Direct
2011-01-11	Common	M	80000.0000	$5.9800	Acquired	192038.0000	Direct
2011-01-11	Common	M	37500.0000	$5.9300	Acquired	229538.0000	Direct
2011-01-11	Common	S	37500.0000	$11.0000	Disposed	192038.0000	Direct
2011-01-11	Common	S	80000.0000	$11.0000	Disposed	112038.0000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-01-10	Stock Option (right to buy)	$5.9800	M	70000.0000	Disposed	2016-06-05	Common (70000.0000)	Direct
2011-01-11	Stock Option (right to buy)	$5.9300	M	37500.0000	Disposed	2018-03-03	Common (37500.0000)	Direct
2011-01-11	Stock Option (right to buy)	$5.9800	M	80000.0000	Disposed	2016-06-05	Common (80000.0000)	Direct

Footnotes

F1: These transactions were made pursuant to the Reporting Person's existing Rule 10b5-1 plan (i.e. a stock trading plan designed to comply with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended).