Key facts
- Mark D. Ein filed SCHEDULE 13D/A for Custom Truck One Source, Inc. Common Stock (CTOS).
- Disclosed ownership: 0%.
- Date of event: 17 Oct 2025.
Mark D. Ein - 17 Oct 2025 SCHEDULE 13D/A Report for Custom Truck One Source, Inc. Common Stock (CTOS)
- Filing Manager
- Mark D. Ein
- Reporting Manager
- Capitol Acquisition Management IV LLC
- Symbol
- CTOS
- Disclosed Ownership
- 0 shares
- Ownership
- 0%
- Form type
- SCHEDULE 13D/A
- Filing time
- 21 Oct 2025, 16:30:01 UTC
- Date of event
- 17 Oct 2025
- SEC
- View on sec.gov
Key filing fact
Mark D. Ein disclosed 0% ownership in Custom Truck One Source, Inc. Common Stock (CTOS) on 17 Oct 2025.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 21 Oct 2025, 16:30.
Research use
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Reporting managers (4)
Names, ownership, 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 |
|---|---|---|---|---|---|---|---|
| Capitol Acquisition Management IV LLC | 0% | 0 | 0 | 0 | /s/ Mark Ein | Mark Ein, Chief Executive Officer | |
| Capitol Acquisition Founder IV LLC | 0% | 0 | 0 | 0 | /s/ Dyson Dryden | Dyson Dryden, Chief Financial Officer | |
| Mark Ein | 2.3% | 5,159,319 | 5,159,319 | 0 | /s/ Mark Ein | Mark Ein | 0001246840 |
| Dyson Dryden | 0% | 0 | 0 | 0 | /s/ Dyson Dryden | Dyson Dryden |
CIK / CUSIP context first