Insider · CIK 0001968376
Apollo Principal Holdings B, L.P.
Files at Diameter Credit Co, Apollo S3 Private Markets Fund. First filing Oct 16, 2024, latest Mar 4, 2026.
In brief
Apollo Principal Holdings B, L.P. files SEC Form 4 as 10% owner at Diameter Credit Co, and also at Apollo S3 Private Markets Fund. Since Oct 16, 2024, Apollo Principal Holdings B, L.P. has reported 11 open-market buys worth $288M and 0 open-market sells worth $0, the latest filed on Mar 4, 2026.
A track record needs three past buys with six months of prices behind them; Apollo Principal Holdings B, L.P. has 0, so none is measured yet.
The newest scored trade: bought $17M of Diameter Credit Co on Mar 2, 2026, filed Mar 4, 2026, scored 50 (moderate). In the last 12 months: 3 buys worth $70M and 0 sells worth $0.
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 50Moderate | -buy 5 Diameter Credit Co | $17M 625,816 shares | +6% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $28M 1,013,331 shares | +11% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $24M 894,433 shares | +10% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $24M 883,966 shares | +12% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $21M 768,708 shares | +11% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $21M 762,371 shares | +12% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $18M 646,339 shares | +12% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $14M 512,319 shares | +10% | - | |
| 55Moderate | -buy 5 Diameter Credit Co | $21M 778,070 shares | +19% | - | |
| 50Moderate | -buy 5 Diameter Credit Co | $18M 687,627 shares | +20% | - | |
| 42Moderate | -buy Apollo S3 Private Markets Fund | $80M 3,216,480 shares | first purchase | - |
Transactions
Every row this insider has filed, 20 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Jul 29, 2026 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnote | -23,657 | $0.00 | $0 | 1,130,056 | Jul 31, 2026 |
| Jul 29, 2026 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnotes | +5,096 | $0.00 | $0 | 2,043,304 | Jul 31, 2026 |
| Apr 29, 2026 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnote | -23,622 | $0.00 | $0 | 1,153,713 | May 1, 2026 |
| Apr 29, 2026 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnote | +5,083 | $0.00 | $0 | 2,038,208 | May 1, 2026 |
| Mar 2, 2026 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +625,816 | $27.96 | $17M | 11,080,958 | Mar 4, 2026 |
| Jan 29, 2026 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnote | -23,602 | $0.00 | $0 | 1,177,335 | Jan 30, 2026 |
| Jan 29, 2026 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnotes | +5,063 | $0.00 | $0 | 2,030,074 | Jan 30, 2026 |
| Nov 14, 2025 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +1,013,331 | $27.63 | $28M | 10,455,143 | Nov 18, 2025 |
| Oct 29, 2025 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnote | -23,543 | $0.00 | $0 | 1,200,937 | Nov 3, 2025 |
| Oct 29, 2025 | - Apollo S3 Private Markets Fund | JOther Class I Shares of Beneficial Ownershipindirect: See Footnotes | +5,050 | $0.00 | $0 | 2,025,011 | Nov 3, 2025 |
| Oct 20, 2025 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +894,433 | $27.39 | $24M | 9,441,812 | Oct 22, 2025 |
| Sep 17, 2025 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +883,966 | $27.72 | $24M | 8,547,379 | Sep 19, 2025 |
| Jul 28, 2025 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +768,708 | $27.32 | $21M | 7,663,413 | Jul 30, 2025 |
| Jun 9, 2025 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +762,371 | $27.55 | $21M | 6,894,705 | Jun 11, 2025 |
| Apr 21, 2025 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +646,339 | $27.08 | $18M | 6,132,334 | Apr 23, 2025 |
| Feb 24, 2025 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +512,319 | $27.33 | $14M | 5,485,995 | Feb 26, 2025 |
| Dec 16, 2024 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +778,070 | $26.99 | $21M | 4,973,676 | Dec 18, 2024 |
| Nov 12, 2024 | - Diameter Credit Co | POpen-market purchase Common shares of beneficial interestindirect: See Footnote | +687,627 | $26.72 | $18M | 4,195,606 | Nov 14, 2024 |
| Oct 11, 2024 | - Apollo S3 Private Markets Fund | POpen-market purchase Class I Shares of Beneficial Ownershipindirect: See Footnote | +1,220,480 | $25.00 | $31M | 1,224,480 | Oct 16, 2024 |
| Oct 11, 2024 | - Apollo S3 Private Markets Fund | POpen-market purchase Class I Shares of Beneficial Ownershipindirect: See Footnote | +1,996,000 | $25.00 | $50M | 1,996,000 | Oct 16, 2024 |
Questions about Apollo Principal Holdings B, L.P.
Answered from the filings on this page, as of the latest one.
Is Apollo Principal Holdings B, L.P. buying or selling?
In the last 12 months Apollo Principal Holdings B, L.P. reported 3 open-market buys worth $70M and 0 open-market sells worth $0 on SEC Form 4; the latest was bought $17M of Diameter Credit Co on Mar 2, 2026. Grants, option exercises and tax withholding are not counted.
How did Apollo Principal Holdings B, L.P.'s past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Apollo Principal Holdings B, L.P. has 0.
Where does Apollo Principal Holdings B, L.P. file Form 4?
Apollo Principal Holdings B, L.P. has filed Form 4 at Diameter Credit Co; Apollo S3 Private Markets Fund. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.