Comparable stake leader
APO Corp.
SEC ownership of Diameter Credit Co
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001916099.
Disclosed value leader
Exor N.V.
Comparable rows
6/11
Latest evidence
31 Mar 2026
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
APO Corp.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
6 of 11
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
APO Corp.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001916099
- Issuer location
- New York, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Diameter Credit Co (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
APO Corp.
Disclosed value leader
Exor N.V.
Comparable rows
6/11
Latest evidence
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 20%
5 rows are not safely comparable across share classes.
13D/G row: APO Corp.
Showing 1-8 of 11 holder rows.
Quick read
APO Corp. leads the comparable SEC ownership view at 20%.
6 of 11 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens APO Corp.'s linked filing trail.
Comparable ownership
Top 5
APO Corp.
20%
ICONIQ Capital, LLC
5.9%
Banco BTG Pactual S.A.
5.8%
Exor N.V.
575%
ORBIMED ADVISORS LLC
20%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 11 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| APO Corp. |
13D/G
|
20%
|
—
8,547,379 shares
|
$0 | 17 Sep 2025 |
| ICONIQ Capital, LLC |
13D/G
3/4/5
10%+ Owner
|
5.9%
|
—
3,003,806 shares
|
$0 | 31 Dec 2025 |
| Banco BTG Pactual S.A. |
13D/G
BTGP Boreas Fund LP - Series A
|
5.8%
|
—
2,971,799 shares
|
$0 | 31 Dec 2025 |
| Exor N.V. |
13F
Company
|
575%
|
$5,001,704,778
182,543,970 shares
|
— | 31 Mar 2026 |
| ORBIMED ADVISORS LLC |
13F
Company
|
20%
|
$22,079,801
6,210,899 shares
|
— | 31 Mar 2026 |
| Strategic Investment Solutions, Inc. /IL |
13F
Company
|
0%
|
$29,157
127 shares
|
— | 31 Mar 2026 |
| Apollo Principal Holdings B, L.P. |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$288,893,373
11,080,958 shares
|
+$76,999,999 | 02 Mar 2026 |
| Jonathan Lewinsohn |
3/4/5
Director
|
—
class O/S missing
|
$17,953,970
642,050 shares
|
+$5,467,499 | 02 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$83,047,998.
Buys
$83,047,998
Insiders: 5
Sells
$0
Insiders: 0
Net
+$83,047,998
Shares: +3,010,452
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 3,010,452
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 40,052 | 0 | $1,119,999 | $0 | +$1,119,999 |
| 6-9 | 1,078,184 | 0 | $29,792,054 | $0 | +$29,792,054 |
| 9-12 | 1,892,216 | 0 | $52,135,945 | $0 | +$52,135,945 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-11 of 11 reporting-owner rows connected to Diameter Credit Co. Open a relationship link for the CIK-to-CIK filing trail.
Rows
11
Largest Forms 3/4/5 holder
Apollo Principal Holdings B, L.P.
Net 12M change
+$83,047,998
Latest report
02 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Apollo Principal Holdings B, L.P. | 10%+ Owner | $288,893,373 | +$76,999,999 | +36% | Mixed | 02 Mar 2026 |
| Jonathan Lewinsohn | Director | $17,953,970 | +$5,467,499 | +44% | Filing P/S | 02 Mar 2026 |
| Joseph Alexander Carvalho | Co-Chief Executive Officer, Director | $883,256 | +$270,000 | +44% | Filing P/S | 02 Mar 2026 |
| Benjamin David Pasternack | Co-Chief Executive Officer | $883,256 | +$270,000 | +44% | Filing P/S | 02 Mar 2026 |
| Vishal Sheth | Chief Financial Officer | $147,062 | +$40,500 | +38% | Filing P/S | 02 Mar 2026 |
| Michael Joshua Cohn | General Counsel and Chief Compliance Officer | Mixed | 01 Aug 2024 | |||
| Steven Bossi | Director | Mixed | 15 Apr 2024 | |||
| Daniel Max Kasell | Director | Mixed | 13 Feb 2024 | |||
| ICONIQ Capital, LLC | 10%+ Owner | Mixed | 13 Feb 2024 | |||
| Wurtz Amanda Richman | Director | Mixed | 13 Feb 2024 | |||
| Shailini Rao | General Counsel and Chief Compliance Officer | Mixed | 13 Feb 2024 |
Recent insider transactions for Diameter Credit Co
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Apollo Principal Holdings B, L.P. | Common shares of beneficial interest | Purchase | 5.99% | 625,816 | 11,080,958 | 02 Mar 2026 | See Footnote | |||
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 5.95% | $500,000 | $27.96 | 17,880 | 318,261 | 02 Mar 2026 | By Diameter Principal Finance LLC | |
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 6% | $512,500 | $27.96 | 18,327 | 323,789 | 02 Mar 2026 | Direct | |
| Benjamin David Pasternack | Common shares of beneficial interest, par value $0.001 | Purchase | 6% | $50,000 | $27.96 | 1,788 | 31,586 | 02 Mar 2026 | Direct | |
| Joseph Alexander Carvalho | Common shares of beneficial interest, par value $0.001 | Purchase | 6% | $50,000 | $27.96 | 1,788 | 31,586 | 02 Mar 2026 | Direct | |
| Vishal Sheth | Common shares of beneficial interest, par value $0.001 | Purchase | 5.37% | $7,500 | $27.96 | 268 | 5,259 | 02 Mar 2026 | Direct | |
| Apollo Principal Holdings B, L.P. | Common shares of beneficial interest | Purchase | 10.7% | $28,000,050 | $27.63 | 1,013,331 | 10,455,143 | 14 Nov 2025 | See Footnote | |
| Joseph Alexander Carvalho | Common shares of beneficial interest, par value $0.001 | Purchase | 10.8% | $80,000 | $27.63 | 2,895 | 29,798 | 14 Nov 2025 | Direct | |
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 10.7% | $800,002 | $27.63 | 28,952 | 300,381 | 14 Nov 2025 | By Diameter Principal Finance LLC | |
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 10.8% | $820,001 | $27.63 | 29,676 | 305,462 | 14 Nov 2025 | Direct | |
| Benjamin David Pasternack | Common shares of beneficial interest, par value $0.001 | Purchase | 10.8% | $80,000 | $27.63 | 2,895 | 29,798 | 14 Nov 2025 | Direct | |
| Vishal Sheth | Common shares of beneficial interest, par value $0.001 | Purchase | 9.79% | $12,000 | $27.63 | 434 | 4,870 | 14 Nov 2025 | Direct | |
| Apollo Principal Holdings B, L.P. | Common shares of beneficial interest | Purchase | 10.5% | $24,499,956 | $27.39 | 894,433 | 9,441,812 | 20 Oct 2025 | See Footnote | |
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 10.4% | $699,999 | $27.39 | 25,555 | 271,428 | 20 Oct 2025 | By Diameter Principal Finance LLC | |
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 10.5% | $717,499 | $27.39 | 26,194 | 275,786 | 20 Oct 2025 | Direct | |
| Vishal Sheth | Common shares of beneficial interest, par value $0.001 | Purchase | 9.68% | $10,500 | $27.39 | 383 | 4,345 | 20 Oct 2025 | Direct | |
| Joseph Alexander Carvalho | Common shares of beneficial interest, par value $0.001 | Purchase | 10.5% | $70,000 | $27.39 | 2,556 | 26,903 | 20 Oct 2025 | Direct | |
| Benjamin David Pasternack | Common shares of beneficial interest, par value $0.001 | Purchase | 10.5% | $70,000 | $27.39 | 2,556 | 26,903 | 20 Oct 2025 | Direct | |
| Vishal Sheth | Common shares of beneficial interest, par value $0.001 | Purchase | 10.6% | $10,500 | $27.72 | 379 | 3,962 | 17 Sep 2025 | Direct | |
| Apollo Principal Holdings B, L.P. | Common shares of beneficial interest | Purchase | 11.5% | $24,499,992 | $27.72 | 883,966 | 8,547,379 | 17 Sep 2025 | See Footnote | |
| Benjamin David Pasternack | Common shares of beneficial interest, par value $0.001 | Purchase | 11.6% | $70,000 | $27.72 | 2,526 | 24,347 | 17 Sep 2025 | Direct | |
| Joseph Alexander Carvalho | Common shares of beneficial interest, par value $0.001 | Purchase | 11.6% | $70,000 | $27.72 | 2,526 | 24,347 | 17 Sep 2025 | Direct | |
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 11.4% | $700,000 | $27.72 | 25,256 | 245,873 | 17 Sep 2025 | By Diameter Principal Finance LLC | |
| Jonathan Lewinsohn | Common shares of beneficial interest, par value $0.001 | Purchase | 11.6% | $717,500 | $27.72 | 25,888 | 249,592 | 17 Sep 2025 | Direct |
* marks a reported price that did not pass the local price check.