# EDGAR Filing Document

**Accession Number:** 0001709682
**File Stem:** 0001709682-26-000010
**Filing Date:** 2026-3
**Character Count:** 7540
**Document Hash:** 5ef9d6b7ca41929b35f7571beaf0a9b5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001709682-26-000010.hdr.sgml**: 20260325

**ACCESSION NUMBER**: 0001709682-26-000010

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20260325

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260325

**DATE AS OF CHANGE**: 20260325

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Custom Truck One Source, Inc.
- **CENTRAL INDEX KEY:** 0001709682
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-EQUIPMENT RENTAL & LEASING, NEC [7359]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38186
- **FILM NUMBER:** 26792578

**BUSINESS ADDRESS:**
- **STREET 1:** 7701 INDEPENDENCE AVENUE
- **CITY:** KANSAS CITY
- **STATE:** MO
- **ZIP:** 64125
- **BUSINESS PHONE:** (816) 241-4888

**MAIL ADDRESS:**
- **STREET 1:** 7701 INDEPENDENCE AVENUE
- **CITY:** KANSAS CITY
- **STATE:** MO
- **ZIP:** 64125

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NESCO HOLDINGS, INC.
- **DATE OF NAME CHANGE:** 20190730

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Capitol Investment Corp. IV
- **DATE OF NAME CHANGE:** 20170619

?xml version='1.0' encoding='ASCII'? ctos-20260325

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**Form 8-K** 

**CURRENT REPORT** 

**Pursuant to Section 13 or 15(d)** 

**of the Securities Exchange Act of 1934** 

**Date of Report** (Date of Earliest Event Reported): **March 25, 2026** 

**CUSTOM TRUCK ONE SOURCE, INC.**

(Exact Name of Registrant as Specified in its Charter)

---

| | | | |
|:---|:---|:---|:---|
| **Delaware** | **001-38186** | **001-38186** | **84-2531628** |
| (State or other jurisdiction<br>of incorporation) | (Commission<br>File Number) | (Commission<br>File Number) | (IRS Employer<br>Identification No.) |
| **7701 Independence Avenue**<br>**Kansas City, Missouri** | **7701 Independence Avenue**<br>**Kansas City, Missouri** | **64125** | **64125** |
| (Address of principal executive offices) | (Address of principal executive offices) | (Zip Code) | (Zip Code) |

---

**(816) 241-4888**

(Registrant's telephone number, including area code)

**Not Applicable**

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| Title of Each Class | Trading Symbol(s) | Name of Each Exchange on Which Registered |
| Common Stock, $0.0001 par value | CTOS | New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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**Item 7.01. Regulation FD Disclosure.**

On March 25, 2026, Custom Truck One Source, Inc. (the "Company") issued a press release announcing that it will host a webinar at 9:00 a.m. ET on Wednesday, April 1, 2026, to discuss the previously announced changes to its segment reporting. Management will present the operating segment realignment during a webcast presentation. The full text of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

The information in this Item 7.01 shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any of the Company's filings under the Securities Act or the Exchange Act, whether made before or after the date hereof and regardless of any general incorporation language in such filings, except to the extent expressly set forth by specific reference in such a filing.

**Item 9.01. Financial Statements and Exhibits.**

(d)&nbsp;&nbsp;&nbsp;&nbsp;Exhibits.

---

| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 99.1 | <u>[Press release of Custom Truck One Source, Inc., dated March 25, 2026](ex99132526-ctosrexsegmenta.htm)</u> |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document and contained in Exhibit 101) |

---

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
| Date: | March 25, 2026 | Custom Truck One Source, Inc. |
| | | /s/ Christopher J. Eperjesy |
| | | Christopher J. Eperjesy<br>Chief Financial Officer |

---

## Exhibit 99.1

Exhibit 99.1

![image_0.jpg](image_0.jpg)**Custom Truck One Source to Host a Webinar on Changes to its Segment Reporting**

KANSAS CITY, Mo., March 25, 2026 — (BUSINESS WIRE) — Custom Truck One Source, Inc. (NYSE: CTOS) today announced it will host a webinar at 9:00 a.m. ET on Wednesday, April 1, 2026, to discuss the previously announced changes to its segment reporting.

Management will present the operating segment realignment during a webcast presentation. Both the webcast link and presentation materials will be posted on the "Events & Presentations" page of investors.customtruck.com. To listen by phone, please dial 1-800-715-9871 or 1-646-307-1963 and provide the operator with conference ID 8870161. The webcast link described above and a replay of the call will be available until 11:59 p.m. ET, Friday, May 1, 2026. The call replay may be accessed by dialing<br>1-800-770-2030 or 1-609-800-9909 and entering the passcode 8870161 followed by the # key.

**ABOUT CUSTOM TRUCK ONE SOURCE**

Custom Truck One Source is one of the largest providers of specialty equipment, parts, tools, accessories and services to the electric utility transmission and distribution, telecommunications and rail markets in North America, with a differentiated "one-stop-shop" business model. The Company offers its specialized equipment to a diverse customer base for the maintenance, repair, upgrade and installation of critical infrastructure assets, including electric lines, telecommunications networks and rail systems. The Company's coast-to-coast rental fleet of more than 10,400 units includes aerial devices, boom trucks, cranes, digger derricks, pressure drills, stringing gear, hi-rail equipment, repair parts, tools and accessories. For more information, please visit customtruck.com.

**INVESTOR CONTACT**

Brian Perman, Vice President, Investor Relations

investors@customtruck.com

<br>