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Notice of Proposed Sale · 144

ON Semiconductor Corporation

ONNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Oct 1, 2026Accepted Oct 1, 2026, 4:35 PM EDTFiling CIK 1722291Accession 0001965301-26-000153
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Structured filing — 144

primary_doc.xml

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer
ON SEMICONDUCTOR CORP
Issuer CIK
0001097864
SEC file number
001-39317
Phone
6022446600
Person for whose account securities are to be sold
GOPALSWAMY SUDHIR
Relationships to issuer
Officer
Street
5701 NORTH PIMA ROAD
City
SCOTTSDALE
State / country code
AZ
Postal code
85250

Securities proposed for sale

Securities proposed for sale · 1 reported row
SecurityProposed unitsAggregate market valueUnits outstandingApproximate sale dateExchangeBroker / market maker
Common15,5781,246,240.00389,311,72110/01/2026NASDAQRockefeller Capital Management

Broker / market maker — proposed row 1, entry 1

Name
Rockefeller Capital Management
Street
1850 MT. Diablo BLVD, Suite 300
City
Walnut Creek
State / country code
CA
Postal code
94596

Acquisition of securities to be sold

Acquisition of securities to be sold · 3 reported rows
SecurityAcquiredNature of acquisitionAcquired fromAmount acquiredGift transactionPayment dateNature of payment
Common02/07/2025Stock AwardIsuer4,536N02/07/2025Compensation
Common02/07/2025Stock AwardIssuer2,204N02/07/2025Compensation
Common04/22/2024Stock AwardIssuer8,838N04/22/2024Compensation

Prior-sale reporting

Nothing to report for the preceding three months
Y

Remarks

Shares sold from the following trust: SUDHIR GOPALSWAMY LIVING TRUST

Notice signature

Notice date
10/01/2026
Signed
Carmen Zamores as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for GOPALSWAMY SUDHIR
Plan adoption dates
05/14/2026

Company context

Current securities

Recent company filings

  1. RW filingOct 2, 2026
  2. DEFA14A filingOct 1, 2026
  3. Entry into a Material Definitive Agreement · Other EventsOct 1, 2026
  4. 425 filingSep 16, 2026
  5. S-4 filingAug 21, 2026

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