Results of Operations and Financial Condition. On August 3, 2026, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended June 30, 2026. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act of…

Results of Operations and Financial Condition. On April 27, 2026, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended March 31, 2026. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act o…

Results of Operations and Financial Condition. On March 10, 2026, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the fiscal year and quarter ended December 31, 2025. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed “furnished” and not “filed” for purposes of Section 18 of the Securi…

Chief Accounting Officer — R. Todd Barrett: Mr. Barrett resigned as the Chief Accounting Officer of the Company.

Results of Operations and Financial Condition. On October 27, 2025, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended September 30, 2025. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange…

Results of Operations and Financial Condition. On July 30, 2025, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended June 30, 2025. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act of…

Results of Operations and Financial Condition. On April 30, 2025, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended March 31, 2025. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act o…

Results of Operations and Financial Condition. On March 4, 2025, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the fiscal year and quarter ended December 31, 2024. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed “furnished” and not “filed” for purposes of Section 18 of the Securit…

Results of Operations and Financial Condition. On October 30, 2024, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended September 30, 2024. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange…

Director — Rahman D’Argenio: Mr. Rahman D'Argenio resigned as a member of the Board of Directors and ECP does not intend to designate a replacement.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth above under

Entry into a Material Definitive Agreement. On August 9, 2024, NESCO Holdings II, Inc. (the “Borrower”), an indirect subsidiary of Custom Truck One Source, Inc. (the “Company”), along with certain other indirect subsidiaries of the Company entered into an amendment (the “ABL Amendment”) to its existing Revolving Credit Agreement, dated as of April 1, 2021 (as previously amended, supplemented or modified, including by the ABL Amendment, the “Credit Agreement”), among the Borrower, as borrower,…

Results of Operations and Financial Condition. On August 1, 2024, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended June 30, 2024. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act of…

Results of Operations and Financial Condition. On May 2, 2024, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended March 31, 2024. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act of 1…

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On March 14, 2024, the New York Stock Exchange (the “NYSE”) notified Custom Truck One Source, Inc. (the “Company”), and on March 15, 2024, publicly announced, that the NYSE has determined to (a) commence proceedings to delist the Company’s redeemable warrants listed on the NYSE under the ticker symbol “CTOS.WS,” each exercisable to purchase one share of the Company’s common stock at a price of…

Other Events On March 11, 2024, the Board of Directors of Custom Truck One Source, Inc. (the “Company”) approved a stock repurchase program that authorizes the repurchase of up to $25 million of shares of the Company’s common stock. Under the repurchase program, repurchases can be made from time to time using a variety of methods, which may include open market purchases, privately negotiated transactions, or otherwise, all in accordance with the rules of the Securities and Exchange Commission…

Results of Operations and Financial Condition. On March 7, 2024, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the fiscal year and quarter ended December 31, 2023. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed “furnished” and not “filed” for purposes of Section 18 of the Securit…

Results of Operations and Financial Condition. On November 7, 2023, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended September 30, 2023. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange…

Other Events. On September 14, 2023, the Board of Directors of Custom Truck One Source, Inc. (the “Company”) approved a stock repurchase program that authorizes the repurchase of up to $25 million of shares of the Company’s common stock. Under the repurchase program, repurchases can be made from time to time using a variety of methods, which may include open market purchases, privately negotiated transactions, or otherwise, all in accordance with the rules of the Securities and Exchange Commi…

Results of Operations and Financial Condition. On August 8, 2023, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended June 30, 2023. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act of…

Director — Bryan Kelln: Mr. Kelln resigned as a director without any disagreement with the company.

Results of Operations and Financial Condition. On May 9, 2023, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended March 31, 2023. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act of 1…

Entry into a Material Definitive Agreement. 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”), to account…

Results of Operations and Financial Condition. On March 14, 2023, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the fiscal year and quarter ended December 31, 2022. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Item 2.02, including Exhibit 99.1, shall be deemed “furnished” and not “filed” for purposes of Section 18 of the Securi…

CEO — Fred Ross and Ryan McMonagle: Fred Ross is retiring as CEO, succeeded by Ryan McMonagle.