ON SEMICONDUCTOR CORP — Director's Dealing 2011

Jan 14, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2011-01-12

Reporting Person: Schromm William A. (SVP & GM, Comp & Cnsmr Prd Grp)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-01-12	Common	M	8000.0000	$7.0200	Acquired	108541.8900	Direct
2011-01-12	Common	M	8000.0000	$3.2200	Acquired	116541.8900	Direct
2011-01-12	Common	S	8000.0000	$11.0340	Disposed	108541.8900	Direct
2011-01-12	Common	S	8000.0000	$11.0340	Disposed	100541.8900	Direct
2011-01-12	Common	S	15000.0000	$11.1000	Disposed	85541.8900	Direct
2011-01-12	Common	S	15291.0000	$11.0340	Disposed	70250.8900	Direct
2011-01-14	Common	M	5000.0000	$4.8000	Acquired	75250.8900	Direct
2011-01-14	Common	S	5000.0000	$11.8000	Disposed	70250.8900	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-01-12	Stock Option (right to buy)	$3.2200	M	8000.0000	Disposed	2012-01-24	Common (8000.0000)	Direct
2011-01-12	Stock Option (right to buy)	$7.0200	M	8000.0000	Disposed	2014-02-05	Common (8000.0000)	Direct
2011-01-14	Stock Option (right to buy)	$4.8000	M	5000.0000	Disposed	2015-02-17	Common (5000.0000)	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).

F2: This disposition transaction was executed in multiple trades at prices ranging from $10.99 to $11.11. 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.