Form
SCHEDULE 13G/A
Passive or exempt beneficial ownership filing.
Apollo Management Holdings GP, LLC - 31 Mar 2026 SCHEDULE 13G/A Report for Calamos Strategic Total Return Fund Series F Mandatory Redeemable Preferred Shares
- Filing manager
- Apollo Management Holdings GP, LLC
- Reporting owner
- Apollo Management Holdings GP, LLC
- Beneficially owned shares
- 1,920,000 shares
- Large-stake signal
-
Ownership
48%Beneficial ownership of this reported class.
Shares
1,920,000 sharesShares beneficially owned as disclosed.
Event date
31 Mar 2026Date tied to the ownership event or amendment.
Accepted by SEC
14 May 2026EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 48%
- Shares outstanding
- 4,000,000 shares
- SEC form
- SCHEDULE 13G/A
- Accepted by SEC
- 14 May 2026, 17:26:53 UTC
- Event date
- 31 Mar 2026
- Prior SEC filing
- 13 Feb 2026
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
1 source field
Source evidence
Original filing metadata and source links for verification.
5 source fields
Key filing fact
Apollo Management Holdings GP, LLC disclosed 48% ownership in Calamos Strategic Total Return Fund Series F Mandatory Redeemable Preferred Shares on 31 Mar 2026.
Key facts
- Apollo Management Holdings GP, LLC filed SCHEDULE 13G/A for Calamos Strategic Total Return Fund Series F Mandatory Redeemable Preferred Shares.
- Disclosed ownership: 48%.
- Date of event: 31 Mar 2026.
Change
- Previous schedule filing date: 13 Feb 2026.
- Current filing was accepted on 14 May 2026, 17:26.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (9)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Apollo Management Holdings GP, LLC | 48% | 1,920,000 | 0 | 1,920,000 | /s/ William B. Kuesel | William B. Kuesel, Vice President | |
| Athene Annuity and Life Company | 48% | 1,920,000 | 0 | 1,920,000 | Apollo Insurance Solutions Group LP | Investment Adviser | |
| Apollo Insurance Solutions Group LP | 48% | 1,920,000 | 0 | 1,920,000 | AISG GP Ltd. | General Partner | |
| AISG GP Ltd. | 48% | 1,920,000 | 0 | 1,920,000 | /s/ Angelo Lombardo | Angelo Lombardo, Authorized Signatory | |
| Apollo Life Asset L.P. | 48% | 1,920,000 | 0 | 1,920,000 | Apollo Life Asset GP, LLC | General Partner | |
| Apollo Life Asset GP, LLC | 48% | 1,920,000 | 0 | 1,920,000 | Apollo Capital Management, L.P. | Managing Member | |
| Apollo Capital Management, L.P. | 48% | 1,920,000 | 0 | 1,920,000 | Apollo Capital Management GP, LLC | General Partner | |
| Apollo Capital Management GP, LLC | 48% | 1,920,000 | 0 | 1,920,000 | /s/ William B. Kuesel | William B. Kuesel, Vice President | |
| Apollo Management Holdings, L.P. | 48% | 1,920,000 | 0 | 1,920,000 | /s/ William B. Kuesel | William B. Kuesel, Vice President |
CIK / CUSIP context first