---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-23-029927"
form_type: "8-K"
ticker: "CTOS"
cik: "0001709682"
company_name: "Custom Truck One Source, Inc."
filed_at: "2023-04-14T23:59:59+00:00"
generated_at: "2026-06-17T02:01:18.247998+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Custom Truck One Source amends stockholders' agreement, removes Blackstone as party

## Summary
- Removes Blackstone Group and its affiliates as stockholders of the Company.
- Clarifies the number of votes to which each board director is entitled.
- Agreement becomes effective upon stockholder approval of Third Amended Certificate at June 15, 2023 annual meeting.
- No financial terms or material changes to governance structure beyond administrative updates.

## SEC filing metadata
- accession: 0001213900-23-029927
- form_type: 8-K
- ticker: CTOS
- cik: 0001709682
- company_name: Custom Truck One Source, Inc.
- filed_at: 2023-04-14T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1709682/000121390023029927/0001213900-23-029927-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1709682/000121390023029927/ea176991-8k_custom.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-23-029927
- JSON: https://secwatch.observer/filing/0001213900-23-029927.json
- Plain text: https://secwatch.observer/filing/0001213900-23-029927.txt

## Key facts
- Material Agreements
  Custom Truck One Source, Inc. entered into Second Amended and Restated Stockholders’ Agreement with certain affiliates of Platinum Equity Advisors, LLC, Energy Capital Partners, LLC, Capitol Acquisition Management IV LLC, Capitol Acquisition Founder IV LLC and certain other stockholders of the Company (effective 2023-04-14).
  - Action: entry
  - Counterparty: certain affiliates of Platinum Equity Advisors, LLC, Energy Capital Partners, LLC, Capitol Acquisition Management IV LLC, Capitol Acquisition Founder IV LLC and certain other stockholders of the Company
  - Effective: 2023-04-14
  source text: On April 14, 2023, Custom Truck One Source, Inc. (the “Company”), certain affiliates of Platinum Equity Advisors, LLC (“Platinum”), Energy Capital Partners, LLC (“ECP”), Capitol Acquisition Management IV LLC and Capitol Acquisition Founder IV LLC (together, “Capitol”) and certain other stockholders of the Company entered into a Second Amended and Restated Stockholders’ Agreement (the “Second Amended and Restated Stockholders’ Agreement”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/1709682/000121390023029927/0001213900-23-029927-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.