# EDGAR Filing Document

**Accession Number:** 0001097864
**File Stem:** 0001225208-25-008507
**Filing Date:** 2025-10
**Character Count:** 9608
**Document Hash:** c0547afb45134e8b66fb2c647634d1c4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001225208-25-008507.hdr.sgml**: 20251006

**ACCESSION NUMBER**: 0001225208-25-008507

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20251003

**FILED AS OF DATE**: 20251006

**DATE AS OF CHANGE**: 20251006

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** MASCARENAS PAUL ANTHONY
- **CENTRAL INDEX KEY:** 0001625756

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39317
- **FILM NUMBER:** 251377306

**MAIL ADDRESS:**
- **STREET 1:** 3850 HAMLIN ROAD
- **CITY:** AUBURN HILLS
- **STATE:** MI
- **ZIP:** 48326
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ON SEMICONDUCTOR CORP
- **CENTRAL INDEX KEY:** 0001097864
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 363840979
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 5701 NORTH PIMA ROAD
- **CITY:** SCOTTSDALE
- **STATE:** AZ
- **ZIP:** 85250
- **BUSINESS PHONE:** 6022446600

**MAIL ADDRESS:**
- **STREET 1:** 5701 NORTH PIMA ROAD
- **CITY:** SCOTTSDALE
- **STATE:** AZ
- **ZIP:** 85250

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SCG HOLDING CORP
- **DATE OF NAME CHANGE:** 19991027

## Ex-24

```

Exhibit 24

POWER OF ATTORNEY
(Paul A. Mascarenas)

	I hereby appoint Thad Trent, Paul Dutton, Travis Ruffo, Hope M. Spencer, Angela
  Park, and Joshua B. Naftulin, and each of them, attorney-in-fact (each, an
"Attorney-in-Fact") for me, each with full power of substitution, to prepare,
execute and deliver on my behalf reports required to be filed by me pursuant to
Section 13 or Section 16 of the Securities Exchange Act of 1934, as amended (the
  "Exchange Act"), and Rule 144 under the Securities Act of 1933, as amended
("Rule 144"),  and any and all related documents and instruments. Among other
things, each Attorney-in-Fact is authorized to:
* take such action(s) as may be necessary or appropriate to enable the
undersigned to submit and file forms, schedules and other documents with United
States Securities and Exchange Commission ("SEC") utilizing the SEC's Electronic
  Data Gathering and Retrieval ("EDGAR") system, which actions may include (i)
enrolling the undersigned in EDGAR Next and (ii) preparing, executing and
submitting to the SEC a Form ID, including any amendments to such Form ID, and
any other documents necessary or appropriate to obtain codes and passwords
enabling the undersigned to make electronic filings utilizing the EDGAR system;
* prepare and execute any and all forms, schedules and other documents
(including any amendments thereto) the undersigned is required to file with the
SEC, or which the Attorney-in-Fact considers advisable for the undersigned to
file with the SEC, under Section 13 or Section 16 of the Exchange Act, and Rule
144, including Forms 3, 4, and 5, Form 144 and Schedules 13D or 13G, with the
SEC, any and all related documents and instruments, and to provide any necessary
  copies of such signed forms, documents, and instruments to The NASDAQ Stock
Market and ON Semiconductor Corporation (the "Company")as required by applicable
  rules under Section 13, Section 16 and Rule 144 as in effect from time to
time;
* submit and file SEC filings with the SEC utilizing the EDGAR system or cause
them to be submitted and filed by a person appointed as an Account Administrator
  (defined below);
* act as an account administrator for the undersigned's EDGAR account (each, an
"Account Administrator"), including: (i) appoint, remove and replace account
administrators, account users, technical administrators and delegated entities;
(ii) maintain the security of the undersigned's EDGAR account, including
modification of access codes; (iii) maintain, modify and certify the accuracy of
  information on the undersigned's EDGAR account dashboard; (iv) act as the
EDGAR point of contact with respect to the undersigned's EDGAR account; and (v)
any other actions contemplated by Rule 10 of Regulation S-T with respect to
account administrators;
* cause the Company to accept a delegation of authority from any of the
undersigned's EDGAR account administrators and, pursuant to that delegation,
authorize the Company's EDGAR account administrators to appoint, remove or
replace users for the undersigned's EDGAR account; and
* seek or obtain, as my representative and on my behalf, information concerning
transactions in or with respect to the Company's securities from any third
party, including brokers, employee benefit plan administrators and trustees,
knowing that I hereby authorize any such person to release any such information
to the Attorney-in-Fact and approve any such release of information.

	This power of attorney is effective from the date hereof and shall remain in
effect until revoked or terminated.

Dated: August 14, 2025

/s/ PAUL A. MASCARENAS
Paul A. Mascarenas

```

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>MASCARENAS PAUL ANTHONY<br><sub>(Last) (First) (Middle)</sub><br>5701 NORTH PIMA ROAD<br><sub>(Street)</sub><br>SCOTTSDALE, AZ 85250<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-10-03 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>ON SEMICONDUCTOR CORP [ ON ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common | 2025-10-03 |  | A |  | 212<sup>(1)</sup> | A | $49.2700 | 55131 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) Represents fully-vested shares of common stock issued to the Reporting Person in lieu of a portion of his quarterly cash retainers for the third quarter of 2025 based on his previously-submitted election.

**Remarks:**
Hope M. Spencer is signing on behalf of the Reporting Person pursuant to a Power of Attorney attached hereto as Exhibit 24.

**Signature:** /s/ Hope M. Spencer, Attorney-in-Fact  
**Date:** 2025-10-06

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**