SCHEDULE 13D/A

Custom Truck One Source Inc

Common Stock · CUSIP: 23204X103

Event date: 2025-01-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Platinum Equity Capital Partners V, L.P.Reported CIK 0001778958

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity Partners V, L.P.Reported CIK 0001854950

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity Partners V, LLCReported CIK 0001854827

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity Investment Holdings V, LLCReported CIK 0001854932

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity Investment Holdings V Manager, LLCReported CIK 0001854967

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity InvestCo, L.P.Reported CIK 0001756331

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum InvestCo (Cayman), LLCReported CIK 0001766567

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity Investment Holdings IC (Cayman), LLCReported CIK 0001756330

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity Investment Holdings, LLCReported CIK 0001634372

  Shares: 156,743,635.00 · Class: 69.6%

• Platinum Equity, LLCReported CIK 0001228754

  Shares: 156,743,635.00 · Class: 69.6%

• Tom GoresReported CIK 0001471783

  Shares: 156,743,635.00 · Class: 69.6%

• PE One Source Holdings, LLCReported CIK 0001855018

  Shares: 156,743,635.00 · Class: 69.6%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.