ON SEMICONDUCTOR CORP — Director's Dealing 2011

Sep 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2011-09-16

Reporting Person: Mahoney Robert Charles (Exec VP Sales & Marketing)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-09-16	Common	M	10000.0000	$5.9300	Acquired	145266.0000	Direct
2011-09-16	Common	S	10000.0000	$8.2200	Disposed	135266.0000	Direct
2011-09-16	Common	S	20000.0000	$8.2201	Disposed	115266.0000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-09-16	Stock Option (right to buy)	$5.9300	M	10000.0000	Disposed	2018-03-03	Common (10000.0000)	Direct

Footnotes

F1: This disposition transaction was executed in multiple trades at prices ranging from $8.22 to $8.225. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide, upon request, to the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.