ON SEMICONDUCTOR CORP — Director's Dealing 2010

Nov 5, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2010-11-03

Reporting Person: KLOSTERBOER ROBERT A. (SVP & GM, Dig & MxdSig Prd Grp)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-11-03	Common	A	8750.0000	$7.8600	Acquired	46297.0000	Direct
2010-11-03	Common	F	2761.0000	$7.8600	Disposed	43536.0000	Direct
2010-11-04	Common	A	20650.0000	$8.0100	Acquired	64186.0000	Direct
2010-11-04	Common	F	6516.0000	$8.0100	Disposed	57670.0000	Direct

Footnotes

F1: This transaction reports the acquisition, effective November 3, 2010 of 8,750 shares of common stock resulting from the attainment of a performance goal under an earlier award of Performance Based Restricted Stock Units ("PBRSU Award") as described in further detail below. The Compensation Committee of the Issuer originally awarded 25,000 PBRSUs to the Reporting Person with an effective grant date of June 2, 2008 subject to the Issuer's 2000 Stock Incentive Plan and a related award agreement. The PBRSU Award vests generally over a three-year (twelve quarter) period but only upon the Issuer achieving certain adjusted non-GAAP earnings before interest, taxes, depreciation and amortization ("EBITDA") base and target performance measurements as set forth in the PBRSU Award agreement.

F2: This disposition transaction represents shares withheld by the Issuer pursuant to the Reporting Person's June 2, 2008 award of Performance Based Restricted Stock Units ("PBRSUs"). On November 3, 2010 certain of these units vested. These shares were withheld to satisfy the Reporting Person's withholding obligations for various taxes and similar items. The Issuer will pay these taxes on behalf of the Reporting Person.

F3: This transaction reports the acquisition, effective November 4, 2010 of 20,650 shares of common stock resulting from the attainment of a performance goal under an earlier award of Performance Based Restricted Stock Units ("PBRSU Award") as described in further detail below. The Compensation Committee of the Issuer originally awarded 247,797 PBRSUs to the Reporting Person with an effective grant date of March 2, 2009 subject to the Issuer's 2000 Stock Incentive Plan and a related award agreement. The PBRSU Award vests generally over a three-year (twelve quarter) period but only upon the Issuer achieving certain adjusted non-GAAP earnings before interest, taxes, depreciation and amortization ("EBITDA") base and target performance measurements as set forth in the PBRSU Award agreement.

F4: This disposition transaction represents shares withheld by the Issuer pursuant to the Reporting Person's March 2, 2009 award of Performance Based Restricted Stock Units ("PBRSUs"). On November 4, 2010 certain of these units vested. These shares were withheld to satisfy the Reporting Person's withholding obligations for various taxes and similar items. The Issuer will pay these taxes on behalf of the Reporting Person.