# EDGAR Filing Document

**Accession Number:** 0001968376
**File Stem:** 0001104659-25-058596
**Filing Date:** 2025-6
**Character Count:** 13242
**Document Hash:** eb4b75daf74a736395526d07a28a580a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-058596.hdr.sgml**: 20250611

**ACCESSION NUMBER**: 0001104659-25-058596

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20250609

**FILED AS OF DATE**: 20250611

**DATE AS OF CHANGE**: 20250611

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Apollo Principal Holdings B GP, LLC
- **CENTRAL INDEX KEY:** 0002011937

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

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-56624
- **FILM NUMBER:** 251041025

**BUSINESS ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 2125153265

**MAIL ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Apollo Principal Holdings VI GP, LLC
- **DATE OF NAME CHANGE:** 20240213
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Apollo Principal Holdings B, L.P.
- **CENTRAL INDEX KEY:** 0001968376

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-56624
- **FILM NUMBER:** 251041027

**BUSINESS ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 212-822-0516

**MAIL ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Apollo Principal Holdings VI, L.P.
- **DATE OF NAME CHANGE:** 20230306
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** APO Corp.
- **CENTRAL INDEX KEY:** 0002012136

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

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-56624
- **FILM NUMBER:** 251041024

**BUSINESS ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 2125153265

**MAIL ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** AP DLF Offshore Investor, LP
- **CENTRAL INDEX KEY:** 0002011995

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

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-56624
- **FILM NUMBER:** 251041026

**BUSINESS ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 2125153265

**MAIL ADDRESS:**
- **STREET 1:** 9 WEST 57TH STREET
- **STREET 2:** 41ST FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Diameter Credit Co
- **CENTRAL INDEX KEY:** 0001916099

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 55 HUDSON YARDS, 29TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10001
- **BUSINESS PHONE:** (212) 655-1419

**MAIL ADDRESS:**
- **STREET 1:** 55 HUDSON YARDS, 29TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10001

## Exhibit 99.1

**Exhibit 99.1**

1. On May 22, 2025, Diameter Credit Company, a Delaware statutory trust (the "Issuer"), issued a capital call notice to certain investors that have committed to purchase shares of common shares of beneficial interest of the Issuer ("Common Shares"). Pursuant to such capital call notice, AP DLF Offshore Investor, L.P. ("Offshore Investor") was obligated to make a capital contribution of $21,000,000.00 on June 9, 2025, and the Issuer issued 762,371.08 Common Shares to Offshore Investor on such date.

2. Offshore Investor holds securities of the Issuer. Apollo Principal Holdings B, L.P. ("Principal Holdings B") serves as the general partner of Offshore Investor. The general partner of Principal Holdings B is Apollo Principal Holdings B GP, LLC ("Principal Holdings B GP"). APO Corp. is the sole member of Principal Holdings B GP.

Principal Holdings B, Principal Holdings B GP, and APO Corp. each disclaim beneficial ownership of all common shares included in this report, and the filing of this report shall not be construed as an admission that any such person or entity is the beneficial owner of any such securities for purposes of Section 13(d) or 13(g) of the Securities Exchange Act of 1934, as amended, or for any other purpose.

The principal office of Offshore Investor, Principal Holdings B, Principal Holdings B GP, and APO Corp. is 9 West 57th Street, 41st Floor, New York, New York 10019.

## Exhibit 99.2

**Exhibit 99.2**

**This Statement on Form 4 is filed by**: (i) AP DLF Offshore Investor, L.P.; (ii) Apollo Principal Holdings B, L.P.; (iii) Apollo Principal Holdings B GP, LLC; and (iv) APO Corp.

**Name of Designated Filer**: Apollo Principal Holdings B, L.P.

**Date of Event Requiring Statement**: June 9, 2025

**Issuer Name**: Diameter Credit Company

---

| | |
|:---|:---|
| **AP DLF Offshore Investor, L.P.** | **AP DLF Offshore Investor, L.P.** |
| By: | Apollo Principal Holdings B, L.P., |
|  | its general partner |
|  | Apollo Principal Holdings B GP, LLC, |
|  | its general partner |
|  | /s/ William B. Kuesel |
|  | Name: William B. Kuesel |
|  | Title: Vice President |
| **APOLLO PRINCIPAL HOLDINGS B, L.P.** | **APOLLO PRINCIPAL HOLDINGS B, L.P.** |
| By: | Apollo Principal Holdings B GP, LLC, |
|  | its general partner |
|  | /s/ William B. Kuesel |
|  | Name: William B. Kuesel |
|  | Title: Vice President |
| **APOLLO PRINCIPAL HOLDINGS B GP, LLC** | **APOLLO PRINCIPAL HOLDINGS B GP, LLC** |
| By: | /s/ William B. Kuesel |
| Name: William B. Kuesel | Name: William B. Kuesel |
| Title: Vice President | Title: Vice President |
| **APO CORP.** | **APO CORP.** |
| By: | /s/ Jessica Lomm |
| Name: Jessica Lomm | Name: Jessica Lomm |
| Title: Secretary | Title: Secretary |

---

### 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>Apollo Principal Holdings B, L.P.<br><sub>(Last) (First) (Middle)</sub><br>9 W. 57TH STREET, 41ST FLOOR<br><sub>(Street)</sub><br>NEW YORK, NY 10019<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-06-09 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Diameter Credit Co [ NONE ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>AP DLF Offshore Investor, LP<br><sub>(Last) (First) (Middle)</sub><br>9 W. 57TH STREET, 41ST FLOOR<br><sub>(Street)</sub><br>NEW YORK, NY 10019<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-06-09 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Diameter Credit Co [ NONE ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Apollo Principal Holdings B GP, LLC<br><sub>(Last) (First) (Middle)</sub><br>9 W. 57TH STREET, 41ST FLOOR<br><sub>(Street)</sub><br>NEW YORK, NY 10019<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-06-09 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Diameter Credit Co [ NONE ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>APO Corp.<br><sub>(Last) (First) (Middle)</sub><br>9 W. 57TH STREET, 41ST FLOOR<br><sub>(Street)</sub><br>NEW YORK, NY 10019<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-06-09 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Diameter Credit Co [ NONE ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] 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 shares of beneficial interest | 2025-06-09 |  | P<sup>(1)</sup> |  | 762371.08 | A | $27.5456 | 6894705.05 | I | See Footnote<sup>(1)</sup> |

---

## 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) See Exhibit 99.1.

**Signature:** see signatures attached as Exhibit 99.2  
**Date:** 2025-06-11

### 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.**