# Diameter Principal Finance LLC

> Diameter Principal Finance LLC is an SEC-registered investment advisory firm in New York, NY, registered since 2023, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated April 29, 2026.

- CRD: 328057
- Filed as: DIAMETER PRINCIPAL FINANCE LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: New York, NY
- Filing period: October 2026
- Form ADV filing dated: April 29, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/328057
- AdvisorCensus page: https://advisorcensus.com/firm/diameter-principal-finance-llc-new-york-ny-328057

## Quick answers

**How is Diameter Principal Finance LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Diameter Principal Finance LLC reports these compensation arrangements: a percentage of assets under its management; performance-based fees. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Diameter Principal Finance LLC located?**
Diameter Principal Finance LLC's principal office is in New York, NY, according to its Form ADV; the May 2026 filing also lists 2 other offices (Schedule D, Section 1.F).

**Is Diameter Principal Finance LLC registered with the SEC or a state?**
Diameter Principal Finance LLC is an SEC-registered investment advisory firm, registered since 2023. Status as filed: Approved. CRD 328057.

**How much does Diameter Principal Finance LLC manage?**
Diameter Principal Finance LLC reports $3,446,912,000 in regulatory assets under management in its Form ADV filing dated April 29, 2026 (100% discretionary).

**How have Diameter Principal Finance LLC's assets and staff changed since 2024?**
In the Form ADV data for Diameter Principal Finance LLC: Regulatory assets under management: $622,880,000 in the October 2024 data and $3,446,912,000 in the October 2026 data, up 453%. Total employees: 69 in October 2024 and 119 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Diameter Principal Finance LLC serve?**
By number of clients on Form ADV Item 5.D: business development companies (1).

**Does Diameter Principal Finance LLC report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/328057

**What changed in Diameter Principal Finance LLC's recent Form ADV filings?**
In the April 2026 filing data: Employees performing advisory functions went from 48 to 62. Regulatory assets under management went from $2,467,752,000 to $3,446,912,000 (+40%). Changed its office addresses in West Palm Beach, FL. Updated its list of owners and control persons (Schedule A).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Performance-based fees

### Regulatory assets under management (Item 5.F)
- Total: $3,446,912,000
- Discretionary: $3,446,912,000
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Business development companies | 1 | $3,446,912,000 |

### Advisory services (Item 5.G)
- Portfolio management for investment companies (and business development companies)

### Firm details
- Registered since: 2023 (2 years)
- Employees: 119 total, 62 performing advisory functions
- Wrap fee program participation: No
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Other offices (Schedule D, Section 1.F), as of the May 2026 filing
- London
- West Palm Beach, FL

### Websites listed on Form ADV (Item 1.I)
- [diametercap.com](https://diametercap.com)
- [diameterdynamiccredit.com](https://diameterdynamiccredit.com)
- LinkedIn @diameter-capital-partners-lp

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2024 | $622,880,000 | 69 | August 1, 2024 |
| October 2025 | $2,467,752,000 | 78 | March 31, 2025 |
| October 2026 | $3,446,912,000 | 119 | April 29, 2026 |

Regulatory assets under management: $622,880,000 in the October 2024 data and $3,446,912,000 in the October 2026 data, up 453%.
Total employees: 69 in October 2024 and 119 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Employees performing advisory functions went from 48 to 62.
- Regulatory assets under management went from $2,467,752,000 to $3,446,912,000 (+40%).
- Changed its office addresses in West Palm Beach, FL.
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Diameter Principal Finance LLC (CRD 328057): Form ADV filing data as of October 2026.