# EDGAR Filing Document

**Accession Number:** 0001404073
**File Stem:** 0001193125-25-186554
**Filing Date:** 2025-8
**Character Count:** 34881
**Document Hash:** fad0d3a7eab52570225f05460415ef89
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-186554.hdr.sgml**: 20250822

**ACCESSION NUMBER**: 0001193125-25-186554

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250822

**DATE AS OF CHANGE**: 20250822

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIRSTENERGY CORP
- **CENTRAL INDEX KEY:** 0001031296
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 341843785
- **STATE OF INCORPORATION:** OH
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-53029
- **FILM NUMBER:** 251247448

**BUSINESS ADDRESS:**
- **STREET 1:** 341 WHITE POND DRIVE
- **CITY:** AKRON
- **STATE:** OH
- **ZIP:** 44320
- **BUSINESS PHONE:** 330-761-7837

**MAIL ADDRESS:**
- **STREET 1:** 341 WHITE POND DRIVE
- **CITY:** AKRON
- **STATE:** OH
- **ZIP:** 44320
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Blackstone Holdings III L.P.
- **CENTRAL INDEX KEY:** 0001404073

**ORGANIZATION NAME:**
- **EIN:** 260288853
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** C/O BLACKSTONE INC.
- **STREET 2:** 345 PARK AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10154
- **BUSINESS PHONE:** (212) 583-5000

**MAIL ADDRESS:**
- **STREET 1:** C/O BLACKSTONE INC.
- **STREET 2:** 345 PARK AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10154

### Attached PDF Documents

**Attachment 1:** `ck0000000000-ex99_1.pdf`

_No text found in this document._

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 3)**

**FirstEnergy Corp.**

*(Name of Issuer)*

**Common Stock, par value $0.10**

*(Title of Class of Securities)*

**337932107**

*(CUSIP Number)*

**John G. Finley**<br>Blackstone Inc.<br>345 Park Avenue<br>New York NY 10154<br>(212) 583-5000

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**08/22/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Blackstone Holdings III L.P.** | Name of reporting person<br>**Blackstone Holdings III L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**ISRAEL** | Citizenship or place of organization<br>**ISRAEL** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**BIP Securities II-B L.P.** | Name of reporting person<br>**BIP Securities II-B L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**25096082.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**25096082.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**25096082.00** | Aggregate amount beneficially owned by each reporting person<br>**25096082.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.35%** | Percent of class represented by amount in Row (11)<br>**4.35%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**BIP-V Securities II-B L.P.** | Name of reporting person<br>**BIP-V Securities II-B L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**3736017.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**3736017.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3736017.00** | Aggregate amount beneficially owned by each reporting person<br>**3736017.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.65%** | Percent of class represented by amount in Row (11)<br>**0.65%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**BIP Holdings Manager L.L.C.** | Name of reporting person<br>**BIP Holdings Manager L.L.C.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Blackstone Infrastructure Associates L.P.** | Name of reporting person<br>**Blackstone Infrastructure Associates L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**BIA GP L.P.** | Name of reporting person<br>**BIA GP L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**BIA GP L.L.C.** | Name of reporting person<br>**BIA GP L.L.C.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Blackstone Holdings III GP L.P.** | Name of reporting person<br>**Blackstone Holdings III GP L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Blackstone Holdings III GP Management L.L.C.** | Name of reporting person<br>**Blackstone Holdings III GP Management L.L.C.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Blackstone Inc.** | Name of reporting person<br>**Blackstone Inc.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Blackstone Group Management L.L.C.** | Name of reporting person<br>**Blackstone Group Management L.L.C.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28832099.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | Aggregate amount beneficially owned by each reporting person<br>**28832099.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **337932107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Stephen A. Schwarzman** | Name of reporting person<br>**Stephen A. Schwarzman** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**28834842.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**28834842.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**28834842.00** | Aggregate amount beneficially owned by each reporting person<br>**28834842.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.99%** | Percent of class represented by amount in Row (11)<br>**4.99%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.10

**(b) Name of Issuer:**
FirstEnergy Corp.

**(c) Address of Issuer's Principal Executive Offices:**
341 White Pond Drive, Akron, OH, 44320

Explanatory Note

This Amendment No. 3 ("Amendment No. 3") amends and supplements the Schedule 13D originally filed with the United States Securities and Exchange Commission (the "SEC") on December 23, 2021 (as amended, the "Schedule 13D") with respect to the common stock, par value $0.10 per share ("Common Stock") of FirstEnergy Corp. (the "Issuer").  Capitalized terms used herein and not otherwise defined shall have the meanings ascribed to them in the Schedule 13D. This Amendment No. 3 is being filed to update the aggregate percentage of the Issuer's Common Stock beneficially owned by the Reporting Persons due to dilution caused by the Issuer's issuance of additional Common Stock from time to time since the date of the filing of the Schedule 13D and not in connection with a disposition of any Common Stock by the Reporting Persons. As of the date hereof, the Reporting Persons no longer beneficially own more than 5% of the outstanding Common Stock of the Issuer.

**Item 5. Interest in Securities of the Issuer**

**(a)**
Item 5 of the Schedule 13D is hereby amended and restated in its entirety as follows:

        The information contained on the cover pages is incorporated by reference into this Item 5.

       The information presented herein sets forth, as of the date of this Schedule 13D, the aggregate number of shares of Common Stock and percentage of Common Stock beneficially owned by each of the Reporting Persons, as well as the number of shares of Common Stock as to which each Reporting Person has the sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition of, or shared power to dispose or to direct the disposition of, based on 577,403,931 shares of Common Stock outstanding as of June 30, 2025, based on the Issuer's Quarterly Report on Form 10-Q filed with the SEC on July 30, 2025.

       BIP Securities is the record holder of 25,096,082 shares of Common Stock, BIP-V Securities is the record holder of 3,736,017 shares of Common Stock and Mr. Schwarzman is the record holder of 2,743 shares of Common Stock.

        BIP Holdings Manager L.L.C. is the general partner of BIP Securities and BIP-V Securities. Blackstone Infrastructure Associates L.P. is the managing member of BIP Holdings Manager L.L.C. BIA GP L.P. is the general partner of Blackstone Infrastructure Associates L.P. BIA GP L.L.C. is the general partner of BIA GP L.P. Blackstone Holdings III L.P. is the sole member of BIA GP L.L.C. Blackstone Holdings III GP L.P. is the general partner of Blackstone Holdings III L.P. Blackstone Holdings III GP Management L.L.C. is the general partner of Blackstone Holdings III GP L.P. Blackstone Inc., a reporting company under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), is the sole member of Blackstone Holdings III GP Management L.L.C. The sole holder of the Series II preferred stock of Blackstone Inc. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly owned by Blackstone Inc.'s senior managing directors and controlled by its founder, Stephen A. Schwarzman.

        Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that any Reporting Person is the beneficial owner of the Common Stock referred to herein for purposes of Section 13(d) of the Exchange Act or for any other purpose and each of the Reporting Persons expressly disclaims beneficial ownership of such shares of Common Stock.

        Except as set forth in this Schedule 13D, to the best knowledge of the Reporting Persons, none of the individuals listed in Schedule I to the Schedule 13D beneficially owns any shares of Common Stock, other than John G. Finley who beneficially owns 1,477 shares of Common Stock, Reginald J. Brown who beneficially owns five shares of Common Stock and Rochelle B. Lazarus who beneficially owns 13,000 shares of Common Stock.

**(b)**
The information contained on the cover pages is incorporated by reference into this Item 5.

**(c)**
During the past 60 days, none of the Reporting Persons, and to the best knowledge of the Reporting Persons, none of the individuals listed in Schedule I to the Schedule 13D, has effected any transactions in the Common Stock.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Blackstone Holdings III L.P.

**Signature:** By: Blackstone Holdings III GP L.P., its general partner, By: Blackstone Holdings III GP Management L.L.C., its general partner, /s/ Victoria Portnoy

**Name/Title:** Victoria Portnoy, Managing Director - Assistant Secretary

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** BIP Securities II-B L.P.

**Signature:** By: BIP Holdings Manager L.L.C., its general partner, /s/ Christopher Placca

**Name/Title:** Christopher Placca, Managing Director

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** BIP-V Securities II-B L.P.

**Signature:** By: BIP Holdings Manager L.L.C., its general partner, /s/ Christopher Placca

**Name/Title:** Christopher Placca, Managing Director

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** BIP Holdings Manager L.L.C.

**Signature:** /s/ Christopher Placca

**Name/Title:** Christopher Placca, Managing Director

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Blackstone Infrastructure Associates L.P.

**Signature:** By: BIA GP L.P., its general partner, By: BIA GP L.L.C., its general partner, /s/ Christopher Placca

**Name/Title:** Christopher Placca, Managing Director

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** BIA GP L.P.

**Signature:** By: BIA GP L.L.C., its general partner, /s/ Christopher Placca

**Name/Title:** Christopher Placca, Managing Director

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** BIA GP L.L.C.

**Signature:** /s/ Christopher Placca

**Name/Title:** Christopher Placca, Managing Director

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Blackstone Holdings III GP L.P.

**Signature:** By: Blackstone Holdings III GP Management L.L.C., its general partner, /s/ Victoria Portnoy

**Name/Title:** Victoria Portnoy, Managing Director - Assistant Secretary

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Blackstone Holdings III GP Management L.L.C.

**Signature:** /s/ Victoria Portnoy

**Name/Title:** Victoria Portnoy, Managing Director - Assistant Secretary

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Blackstone Inc.

**Signature:** /s/ Victoria Portnoy

**Name/Title:** Victoria Portnoy, Managing Director - Assistant Secretary

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Blackstone Group Management L.L.C.

**Signature:** /s/ Victoria Portnoy

**Name/Title:** Victoria Portnoy, Managing Director - Assistant Secretary

**Date:** 08/22/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Stephen A. Schwarzman

**Signature:** /s/ Stephen A. Schwarzman

**Name/Title:** Stephen A. Schwarzman

**Date:** 08/22/2025