ON SEMICONDUCTOR CORP — Director's Dealing 2010

Dec 3, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2010-12-01

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-12-01	Common	S	10267.0000	$8.4400	Disposed	112038.0000	Direct

Footnotes

F1: This disposition transaction was executed in multiple trades at prices ranging from $8.44188 to $8.44. 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.

F2: Includes 1,500 shares acquired by Reporting Person under Issuer's Employee Stock Purchase Plan from 1/1/2010 through 9/30/2010.