Welcome to our dedicated page for Custom Truck One Source SEC filings (Ticker: CTOS), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Custom Truck One Source filings document regulatory disclosures for a specialty equipment provider serving electric utility, telecom, rail, forestry, waste management and infrastructure-related markets. Recent Form 8-K reports furnish operating results, financial-condition updates, investor presentations and Regulation FD materials, including disclosures tied to segment reporting and operating realignment.
The company's proxy materials cover board matters, executive compensation, equity awards and pay-versus-performance information. Other current reports record officer changes and related governance matters, while earnings exhibits describe performance across equipment rental, truck and equipment sales, and aftermarket parts and services activities.
Custom Truck One Source (CTOS) filers submitted Amendment No. 1 to Schedule 13D to report an in-kind distribution and updated ownership. On October 17, 2025, Capitol Acquisition Management IV LLC distributed 3,670,279 shares of common stock to its members on a pro rata basis; as part of this, Mark Ein acquired 3,553,612 shares.
Following the distribution, Mr. Ein reports beneficial ownership of 5,159,319 shares (including options to purchase 20,000 shares that are currently exercisable), representing 2.3% of the class. This percentage is based on 226,559,586 shares outstanding as of July 28, 2025, as disclosed in the issuer’s Form 10‑Q filed July 30, 2025. The filing states the reporting persons have ceased to be beneficial owners of more than five percent of the outstanding common stock. Other reporting persons listed report zero shares following the distribution.