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Form 8-K

sec.gov

8-K — Custom Truck One Source, Inc.

Accession: 0001709682-26-000045

Filed: 2026-10-26

Period: 2026-10-26

CIK: 0001709682

SIC: 7359 (SERVICES-EQUIPMENT RENTAL & LEASING, NEC)

Item: Results of Operations and Financial Condition

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — ctos-20261026.htm (Primary)

EX-99.1 (ex991q32026pressrelease.htm)

GRAPHIC (ctoslogojpg.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: ctos-20261026.htm · Sequence: 1

ctos-20261026

FALSE000170968200017096822026-10-262026-10-26

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): October 26, 2026

CUSTOM TRUCK ONE SOURCE, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware 001-38186 84-2531628

(State or Other Jurisdiction

of Incorporation) (Commission

File Number) (IRS Employer

Identification No.)

7701 Independence Avenue

Kansas City, Missouri

64125

(Address of principal executive offices) (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 (17CFR 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 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. ☐

Item 2.02. Results of Operations and Financial Condition.

On October 26, 2026, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended September 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 1934, as amended (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 of 1933, as amended (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 7.01. Regulation FD Disclosure.

On October 26, 2026, the Company posted an updated investor presentation on its website at www.customtruck.com.

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)    Exhibits.

Exhibit No. Description

99.1

Press release of Custom Truck One Source, Inc.

104 Cover Page Interactive Data File (embedded within the Inline XBRL document and contained in Exhibit 101)

SIGNATURE

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:

October 26, 2026

Custom Truck One Source, Inc.

/s/ Christopher J. Eperjesy

Christopher J. Eperjesy

Chief Financial Officer

EX-99.1

EX-99.1

Filename: ex991q32026pressrelease.htm · Sequence: 2

Document

EXHIBIT 99.1

Custom Truck One Source, Inc. Reports Record Third Quarter 2026 Results and Increases Full Year 2026 Adjusted EBITDA and SER Revenue Guidance

Company Continues to Benefit from Grid Modernization, Electrification, Data Center, and Infrastructure Growth Through Disciplined Execution Focused on Profitable Growth and Deleveraging

KANSAS CITY, Mo. October 26, 2026 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, forestry, waste management and other infrastructure-related end markets, today reported financial results for the three and nine months ended September 30, 2026.

CTOS Third-Quarter Highlights

•Revenue of $495.2 million, an increase of $13.2 million, or 2.7%, compared to the third quarter of 2025, with rental revenue up 20.1%; more than $20.0 million of third-party STEM deliveries shifted into the fourth quarter

•Record average OEC on rent of $1.39 billion, up $132.2 million, or 10.5%, compared to the third quarter of 2025, with fleet utilization of 81.5% and OEC on rent yield of 39.4%

•Gross profit of $113.3 million, an increase of $12.5 million, or 12.4%, compared to the third quarter of 2025

•Adjusted Gross Profit of $170.2 million, an increase of $14.7 million, or 9.4%, compared to the third quarter of 2025

•Net income of $2.3 million, an improvement of $8.1 million, compared to the third quarter of 2025

•Adjusted EBITDA of $110.9 million, an increase of $15.0 million, or 15.6%, compared to the third quarter of 2025; Adjusted EBITDA margin expanded approximately 250 basis points to 22.4%

•SER segment Adjusted EBITDA of $121.9 million, an increase of 22.5% compared to the third quarter of 2025, with segment Adjusted EBITDA margin expanding to 54.6% from 52.4%

•Reduced net leverage ratio to 3.70x, compared to 4.31x at year-end 2025 and 4.53x at the end of the third quarter 2025, even as ending fleet OEC grew $143.0 million year-over-year to a record $1.76 billion

•Raising 2026 SER segment revenue guidance to $870 million to $890 million, from $850 million to $875 million, on continued strength in transmission and distribution (“T&D”) end markets

•Raising CTOS Adjusted EBITDA1 guidance range to $447.5 million to $460 million, from $437.5 million to $455 million, the third increase this year and representing 17% to 20% growth over 2025

•Raising 2026 net rental fleet investment to $210 million to $230 million to capture visible, high-return transmission rental demand; 2026 levered free cashflow is now expected to be slightly positive, with the earnings benefit of the incremental fleet weighted to 2027

“In the third quarter, record demand across our core T&D markets drove 16% year-over-year Adjusted EBITDA growth and 24% growth year to date, and we are raising our full-year Adjusted EBITDA outlook for the third time this year. Our SER segment continued to benefit from strong utility end-market demand, with our rental fleet generating a record quarterly average OEC on rent of nearly $1.4 billion and average utilization of 81.5%. We also ended the quarter with record total OEC of $1.76 billion, providing strong visibility into continued SER growth through the fourth quarter and into 2027,” said Ryan McMonagle, Chief Executive Officer of CTOS. “In STEM, orders grew 22% year-over-year and backlog reached $342 million, and the third-party deliveries that shifted out of the quarter are scheduled to ship in the fourth quarter. Our earnings growth also drove a further meaningful reduction in net leverage, to 3.70x. As we look to the remainder of 2026 and beyond, CTOS is well positioned to participate in powerful secular trends, including utility grid upgrades and transmission expansion, electrification, data center-driven load growth, and infrastructure spending. We remain disciplined in executing our strategy, with a focus on profitable growth, strategic capital deployment, free cash flow generation, and continued deleveraging. Increasing our investment in the rental fleet reflects that discipline as we put capital behind visible, long-duration transmission demand at attractive returns, with the larger earnings benefit arriving in 2027.”

Summary Actual Consolidated Financial Results

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Rental revenue $ 152,696  $ 127,142  $ 434,971  $ 364,217  $ 145,060

Equipment sales 309,597  320,583  985,790  950,558  383,559

Parts sales and services 32,931  34,333  99,531  100,998  34,827

Total revenue 495,224  482,058  1,520,292  1,415,773  563,446

Gross Profit $ 113,280  $ 100,753  $ 340,317  $ 288,831  $ 123,974

Adjusted Gross Profit1

$ 170,198  $ 155,528  $ 510,359  $ 447,704  $ 180,901

Net Income (Loss) $ 2,305  $ (5,756) $ 8,602  $ (51,927) $ 10,399

Adjusted EBITDA1

$ 110,942  $ 95,963  $ 325,682  $ 262,817  $ 116,754

1 - Each of Adjusted Gross Profit and Adjusted EBITDA is a non-GAAP measure. Further information and reconciliations for our non-GAAP measures to the most directly comparable financial measure under United States generally accepted accounting principles (“GAAP”) are included at the end of this press release. CTOS is unable to present a quantitative reconciliation of its forward-looking Adjusted EBITDA for the year ending December 31, 2026 to its most directly comparable GAAP financial measure due to the high variability and difficulty in predicting certain items that affect Adjusted EBITDA including, but not limited to, customer buyout requests on rentals with rental purchase options and income tax expense. Adjusted EBITDA should not be used to predict Net income (loss) as the difference between the measures are variable and unpredictable.

Summary Actual Financial Results by Segment

Beginning January 1, 2026, CTOS is reporting our results under two reportable segments: (1) Specialty Equipment Rentals (“SER”) and (2) Specialty Truck Equipment and Manufacturing (“STEM”). The new SER segment consists of our historical Equipment Rental Solutions (“ERS”) segment (except for certain used sales to be accounted for by STEM) and a portion of our historical Aftermarket Parts and Services (“APS”) segment, and the new STEM segment consists of our historical Truck and Equipment Sales (“TES”) segment, certain used sales that previously were accounted for by ERS and a portion of our historical APS segment. We are also reflecting intercompany activity between the two segments, which is ultimately eliminated in consolidation. This new segment reporting reflects how CTOS’s business is managed and how resources are allocated in 2026 and utilizes Adjusted EBITDA as the segments’ profit measure. Segment Adjusted EBITDA is defined as segment operating income or loss before depreciation and amortization, further excluding the effects of purchase accounting adjustments and the impact of sales-type lease accounting for certain leases containing rental purchase options (or “RPOs”).

Management believes this new presentation better reflects the positioning of CTOS’s strategies and operations portfolio and better reflects key economic drivers, capital intensity, and margin profiles of the respective new segments, as well as aligns our external reporting with how management allocates capital and evaluates performance. Prior period amounts have been recast to reflect the change to two reportable segments.

Specialty Equipment Rentals

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Revenue from external customers:

Rental $ 152,696  $ 127,142  $ 434,971  $ 364,217  $ 145,060

Equipment sales 39,446  34,565  128,882  104,081  51,659

Parts sales and services 19,891  21,182  60,762  64,500  22,100

Total revenue from external customers 212,033  182,889  624,615  532,798  218,819

Intersegment sales 8,121  3,864  19,024  31,190  4,113

Rental AR Provision(1)

668  2,426  5,234  6,629  2,390

Sales type lease adjustment(2)

2,528  667  313  3,103  (4,318)

Total segment revenue 223,350  189,846  649,186  573,720  221,004

Segment Expenses:

Cost of rental, excluding depreciation 32,507  30,133  97,797  90,265  34,542

Cost of equipment sales, net of purchase accounting, sales-type leases and depreciation(3)

29,892  23,519  89,248  67,404  30,884

Cost of parts and services, excluding depreciation 17,395  18,013  53,277  56,983  17,914

Cost of intersegment sales 7,432  3,864  17,270  31,190  3,728

Rental AR provision(1)

668  2,426  5,234  6,629  2,390

Total segment cost of revenue 87,894  77,955  262,826  252,471  89,458

Selling, general and administrative expenses 13,600  12,426  41,808  42,900  14,347

Total segment expenses 101,494  90,381  304,634  295,371  103,805

Segment Adjusted EBITDA $ 121,856  $ 99,465  $ 344,552  $ 278,349  $ 117,199

1-Specifically identifiable lease revenue receivables not deemed probable of collection are recorded as a reduction of rental revenue. This is classified as a segment expense for Segment Adjusted EBITDA reviewed by the chief operating decision maker (“CODM”).

2-Impact of sales-type lease accounting for certain leases containing RPOs: this impact is excluded from the measure of Adjusted EBITDA utilized by our CODM to allocate resources and to assess the performance of our segments as we believe continuing to reflect the transactions as an operating lease better reflects the economics of the transactions given our large portfolio of rental contracts.

3-Excludes the non-cash impact of purchase accounting, impact of sales-type lease accounting for certain leases containing RPOs, further excluding depreciation.

Specialty Truck Equipment & Manufacturing

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Revenue from external customers:

Equipment sales $ 270,151  $ 286,018  $ 856,908  $ 846,477  $ 331,900

Parts sales and services 13,040  13,151  38,769  36,498  12,727

Total revenue from external customers 283,191  299,169  895,677  882,975  344,627

Intersegment sales 158,967  108,975  347,570  301,363  93,153

Total Segment Revenue 442,158  408,144  1,243,247  1,184,338  437,780

Segment Expenses:

Cost of equipment sales, net of purchase accounting and depreciation(1)

232,761  240,732  727,221  711,723  281,235

Cost of parts and services, excluding depreciation 10,894  9,390  29,539  25,468  9,551

Cost of intersegment sales 133,779  108,975  292,560  301,363  78,596

Total segment cost of revenue 377,434  359,097  1,049,320  1,038,554  369,382

Selling, general and administrative expenses 17,269  17,598  54,891  50,114  20,042

Floor plan interest expense 10,819  13,785  32,477  40,846  11,139

Total segment expenses 405,522  390,480  1,136,688  1,129,514  400,563

Segment Adjusted EBITDA $ 36,636  $ 17,664  $ 106,559  $ 54,824  $ 37,217

1-Excludes the non-cash impact of purchase accounting.

Consolidated Adjusted EBITDA

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

SER Adjusted EBITDA $ 121,856  $ 99,465  $ 344,552  $ 278,349  $ 117,199

STEM Adjusted EBITDA 36,636  17,664  106,559  54,824  37,217

Eliminations Adjusted EBITDA (25,877) —  (56,764) —  (14,942)

Segment Adjusted EBITDA 132,615  117,129  394,347  333,173  139,474

Reconciling Items:

Corporate and non-allocated selling, general and administrative expenses (21,673) (21,166) (68,665) (70,356) (22,720)

Adjusted EBITDA $ 110,942  $ 95,963  $ 325,682  $ 262,817  $ 116,754

See the Company’s Quarterly Report on Form 10-Q for the three months ended September 30, 2026 for a reconciliation of segment-level adjusted EBITDA to Consolidated income (loss) before income taxes.

Summary Combined Operating Metrics

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Ending OEC(a) (as of period end)

$ 1,764,963  $ 1,621,725  $ 1,764,963  $ 1,621,725  $ 1,679,255

Average OEC on rent(b)

$ 1,394,661  $ 1,262,477  $ 1,368,297  $ 1,215,570  $ 1,365,689

Fleet utilization(c)

81.5 % 79.3 % 81.5 % 78.0 % 81.6 %

OEC on rent yield(d)

39.4 % 38.2 % 39.2 % 38.2 % 39.4 %

Sales order backlog(e) (as of period end)

$ 341,920  $ 279,785  $ 341,920  $ 279,785  $ 322,470

(a) Ending OEC — Ending original equipment cost (“OEC”) is the original equipment cost of units at the end of the measurement period.

(b) Average OEC on rent — Average OEC on rent is calculated as the weighted-average OEC on rent during the stated period.

(c) Fleet utilization — total number of days the rental equipment was rented during a specified period of time divided by the total number of days available during the same period and weighted based on OEC.

(d) OEC on rent yield (“ORY”) — a measure of return realized by our rental fleet during a period. ORY is calculated as rental revenue (excluding freight recovery and ancillary fees) during the stated period divided by the Average OEC on rent for the same period. For periods of less than 12 months, the ORY is adjusted to an annualized basis.

(e) Sales order backlog — purchase orders received for customized and stock equipment. Sales order backlog should not be considered an accurate measure of future net sales.

Management Commentary

The increase of 20.1% in rental revenue in the third quarter of 2026 compared to the third quarter of 2025 was the result of improved average fleet utilization (which increased to 81.5% compared to 79.3%) driven by increased rental volume, with average OEC on rent increasing by 10.5% year-over-year and OEC on rent yield improving to 39.4%. Compared to the third quarter of 2025, SER rental equipment sales increased 14.1% in the third quarter of 2026 due to an increase in buyout activity of rental contracts with purchase options. SER adjusted EBITDA in the third quarter of 2026 increased 22.5% compared to the third quarter of 2025. SER segment Adjusted EBITDA margin expanded to 54.6% from 52.4% in the prior-year period, and adjusted rental gross margin reached 78.7%.

Total revenue in our STEM segment increased 8% in the third quarter of 2026 compared to the third quarter of 2025 driven by higher intercompany sales to SER to support increased rental activity. This increase was partially offset by a 5.5% decline in new equipment sales driven by lower third-party unit sales volume. Third-party sales were impacted by our strategic decision to prioritize our production for additional investment in the rental fleet to take advantage of current and anticipated rental demand. In addition, unit sales volume was adversely impacted by both a vendor recall, as well as unusual damage to some finished vehicle inventory caused by a hailstorm to our Kansas City location. While these events resulted in reduced sales of more than $20.0 million, we believe they represent only temporary timing issues and that the sales delayed by the vendor recall and hailstorm will be completed in the fourth quarter. Excluding these shifted deliveries, third-party STEM revenue would have exceeded the third quarter of 2025. STEM segment Adjusted EBITDA was $36.6 million in the third quarter of 2026; 2025 segment results reflect intersegment sales at no margin and are not directly comparable. Our STEM backlog increased 22% compared to the third quarter of 2025, and, at approximately 3.8 months of LTM third-party new sales, sits modestly below our targeted range of four to six months.

The increase in net income in the third quarter of 2026, compared to a loss in the third quarter of 2025, was primarily driven by higher operating income resulting from growth in rental revenue due to higher average OEC on rent, as well as lower interest expense.

Adjusted EBITDA for the third quarter of 2026 was $110.9 million, a 15.6% increase compared to the third quarter of 2025, which was largely driven by increased gross profit and lower floor plan interest expense resulting from lower inventory levels.

As of September 30, 2026, cash and cash equivalents were $14.6 million, total debt outstanding was $1,666.0 million, net debt was $1,651.5 million and our net leverage ratio was 3.70x. Availability under the senior secured credit facility was $234.3 million as of September 30, 2026, and based on our borrowing base, we have an additional $288.0 million of suppressed availability that we could access by upsizing our existing facility.

2026 Outlook

We are increasing our full year 2026 SER segment revenue and Adjusted EBITDA1, 4 guidance and raising our net rental fleet investment forecast to reflect record rental performance and sustained demand across our utility T&D end markets.

Consolidated CTOS:

•Revenue is expected to increase 8% to 13% year-over-year, with Adjusted EBITDA1, 4 expected to increase 17% to 20%.

•Net rental fleet investment (purchases less proceeds) for 2026 is expected to be approximately $210 million to $230 million, up from prior guidance of $170 million to $200 million to capture visible, high-return rental demand, while still reflecting a reduction from over $250 million in 2025.

•Inventory ended the third quarter at $1.016 billion, down $26 million from the second quarter. Year-end 2026 inventory months on hand is expected to be approximately flat with year-end 2025, as we prepare for the expected growth in 2027 and the build-up of chassis inventory under our pre-buy program ahead of 2027 emissions regulations.

•Levered free cash flow2, 4 for 2026 is now expected to be slightly positive, compared to prior guidance of more than $50 million, reflecting the increase in net rental fleet investment and the working capital associated with growth. This is a deliberate reallocation of 2026 cash flow toward rental fleet growth with visible, high returns; our underlying earnings outlook has strengthened, as reflected in the higher Adjusted EBITDA guidance. Net leverage ratio3, 4 was 3.70x at September 30, 2026, and is expected to be meaningfully below four times at the end of fiscal 2026; the longer-term target remains achieving a net leverage ratio3, 4 below three times in 2027.

Specialty Equipment Rentals (SER):

•The rental business delivered record results in the quarter, with average OEC on rent of approximately $1.4 billion, average fleet utilization of 81.5% and OEC on rent yield of 39.4% all ahead of expectations. OEC on rent and utilization have continued to grow in the fourth quarter, surpassing $1.5 billion and 84%, respectively, in October.

•Demand for equipment serving the utility transmission and distribution market remains at record levels, led by unprecedented transmission demand, with OEC on rent up more than $132 million year-over-year in the third quarter; further penetration of the vocational rental market, where OEC on rent increased approximately $45 million year-over-year, is expected to provide incremental growth.

•In response to this demand, we are increasing 2026 gross rental fleet investment to approximately $400 million to $430 million, with the incremental investment concentrated in long-term transmission rentals and high-return specialty products. Given delivery timing, the revenue and earnings contribution from these additions will be modest in 2026, with the larger benefit expected in 2027. Average fleet age remained approximately three years at the end of the third quarter, and ending OEC is expected to increase by a mid-to-high single digit percentage in 2026.

Specialty Truck Equipment & Manufacturing (STEM):

•Third-party new sales revenue is expected to increase 3% to 10% in 2026 compared to 2025, with fourth quarter third-party new sales expected to increase at a mid-to-high-teens rate year-over-year as deliveries delayed in the third quarter are completed, supported by continued customer demand, improving product availability and lead times and relationships with key customers, chassis suppliers and attachment suppliers.

•Total STEM revenue is expected to be down marginally to up 3% year-over-year, with results now expected toward the upper end of the range as higher intersegment sales to support rental fleet growth supplement third-party growth.

•Sales order backlog ended the third quarter at $342 million, up 22% year-over-year and 6% sequentially, or approximately 3.8 months of LTM third-party new sales, modestly below the targeted range of four to six months. More than $20 million of third-party deliveries shifted out of the third quarter as a result of a hailstorm at our Kansas City facility and a vendor warranty recall; these units remain in backlog and are expected to be delivered in the fourth quarter. Third quarter orders increased 22% year-over-year, led by the utility, vacuum, refuse, rail and trailer markets, supporting revenue conversion in the fourth quarter and into 2027.

“Third quarter results reflect what we believe are the early stages of what could be a once-in-a-generation transmission demand super-cycle in our utility end markets. Average OEC on rent and total fleet OEC both set new records, utilization and yield remained at or near record levels, and OEC on rent has continued to climb, surpassing $1.5 billion in October. That visibility is why we are raising our net rental fleet investment outlook to $210 million to $230 million and increasing our full-year SER revenue and Adjusted EBITDA1, 4 guidance,” said Chris Eperjesy, Chief Financial Officer of CTOS. “In STEM, we prioritized production capacity for our own rental fleet, and more than $20 million of third-party deliveries shifted out of the quarter as a result of a hailstorm and a vendor recall. Those units remain in backlog and are expected to ship in the fourth quarter, and with orders up 22% year-over-year, we expect fourth quarter consolidated revenue and Adjusted EBITDA1, 4 to be up both year-over-year and sequentially. The incremental fleet investment moderates our 2026 levered free cash flow2, 4 expectations, but it is being deployed against visible, longer-term, high-return demand whose earnings contribution will largely arrive in 2027. We ended the quarter with net leverage3, 4 of 3.70x, down more than 0.8x year-over-year even as we grew the fleet by more than $140 million, and we remain on track to be meaningfully below four times at year-end and to reach our target of below three times in 2027. With LTM Adjusted EBITDA1, 4 now above $446 million, we currently expect another year of double-digit Adjusted EBITDA1, 4 growth in 2027.”

2026 Consolidated Outlook

Revenue $2,100 million — $2,200 million

Adjusted EBITDA1, 4

$447.5 million — $460 million

2026 Revenue Outlook by Segment 5

SER $870 million — $890 million

STEM $1,630 million — $1,700 million

1 - Adjusted EBITDA is a non-GAAP performance measure that we use to monitor our results of operations, to measure performance against debt covenants and performance relative to competitors. Refer to the section below entitled “Non-GAAP Financial and Performance Measures” for further information about Adjusted EBITDA.

2 - Levered Free Cash Flow is defined as net cash provided by operating activities, less cash flow for investing activities, excluding acquisitions, plus acquisition of inventory through floor plan payables – non-trade less repayment of floor plan payables – non-trade, both of which are included in cash flow from financing activities in our Consolidated Statements of Cash Flows.

3 - Net leverage ratio is a non-GAAP performance measure used by management, and we believe it provides useful information to investors because it is an important measure to evaluate our debt levels and progress toward leverage targets, which is consistent with the manner our lenders and management use this measure. Refer to the section below entitled “Non-GAAP Financial and Performance Measures” for further information about net leverage ratio.

4 - CTOS is unable to present a quantitative reconciliation of its forward-looking Adjusted EBITDA, Levered Free Cash Flow, and Net Leverage Ratio for future periods to their respective most directly comparable GAAP financial measure due to the high variability and difficulty in predicting certain items that affect such GAAP measures including, but not limited to, customer buyout requests on rentals with rental purchase options and income tax expense. Adjusted EBITDA, Levered Free Cash Flow, and Net Leverage Ratio should not be used to predict their respective most directly comparable GAAP measure as the differences between the respective measures are variable and unpredictable.

5- Beginning January 1, 2026, transactions between segments are accounted for as if completed on an arm’s length basis using a cost-plus methodology.

CONFERENCE CALL INFORMATION

The Company has scheduled a conference call to discuss its third quarter 2026 results at 9:00 a.m. ET on October 27, 2026, via a live audio-only webcast. Both the webcast link and a presentation of financial information will be posted on the “Events & Presentations” page of investors.customtruck.com. A replay of the call will be available by accessing the same webcast link detailed above.

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, and infrastructure end markets in North America. The Company rents and sells 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 10,850 units includes aerial devices, boom trucks, cranes, digger derricks, vacuum trucks, pressure drills, stringing gear, hi-rail equipment, water trucks, dump trucks, repair parts, tools and accessories. For more information, please visit customtruck.com.

Investors and others should note that we announce material financial and operational information to our investors using our investor relations website (investors.customtruck.com) in addition to press releases, SEC filings and public conference calls. The information we post through our investor relations website may be deemed material. Accordingly, investors should monitor our investor relations website in addition to following our press releases, SEC filings and public conference calls.

FORWARD-LOOKING STATEMENTS

This press release includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995, as amended, and within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended. When used in this press release, the words “estimates,” “projected,” “expects,” “anticipates,” “forecasts,” “suggests,” “plans,” “targets,” “intends,” “believes,” “seeks,” “may,” “will,” “should,” “future,” “propose,” “could,” “would,” and variations of these words or similar expressions (or the negative versions of such words or expressions) are intended to identify forward-looking statements. These forward-looking statements are not guarantees of future performance, conditions or results, and involve a number of known and unknown risks, uncertainties, assumptions and other important factors, many of which are outside the Company's management’s control, that

could cause actual results or outcomes to differ materially from those discussed in this press release. This press release is based on certain assumptions that the Company's management has made in light of its experience in the industry, as well as the Company’s perceptions of historical trends, current conditions, expected future developments and other factors the Company believes are appropriate in these circumstances and at such time. As you read and consider this press release, you should understand that these statements are not guarantees of performance or results. Many factors could affect the Company’s actual performance and results and could cause actual results to differ materially from those expressed in this press release. Important factors, among others, that may affect actual results or outcomes include: increases in labor costs, changes in U.S. trade policy including tariffs, our inability to obtain raw materials, component parts and/or finished goods in a timely and cost-effective manner, and our inability to manage our rental equipment in an effective manner; competition in the equipment dealership and rental industries; our sales order backlog may not be indicative of the level of our future revenues; increases in unionization rate in our workforce; our inability to attract and retain key personnel, including our management and skilled technicians; material disruptions to our operation and manufacturing locations as a result of public health concerns, equipment failures, natural disasters, work stoppages, power outages or other reasons; any further increase in the cost of new equipment that we purchase for use in our rental fleet or for sale as inventory, and aging or obsolescence of our existing equipment, and the fluctuations of market value thereof; disruptions in our supply chain; our business may be impacted by government spending; we may experience losses in excess of our recorded reserves for receivables; uncertainty relating to macroeconomic conditions, unfavorable conditions in the capital and credit markets and our customers’ inability to obtain additional capital as required; increases in price of fuel or freight; regulatory, technological advancement, or other changes in our core end-markets may affect our customers’ spending; our strategic initiatives including acquisitions and divestitures may not be successful and may divert our management’s attention away from operations and could create general customer uncertainty; the interest of our majority stockholder, which may not be consistent with the other stockholders; volatility of our common stock market price; our significant indebtedness, which may adversely affect our financial position, limit our available cash and our access to additional capital, prevent us from growing our business and increase our risk of default; our inability to generate cash, which could lead to a default; significant operating and financial restrictions imposed by our debt agreements; changes in interest rates, which could increase our debt service obligations on the variable rate indebtedness and decrease our net income and cash flows; disruptions or security compromises affecting our information technology systems or those of our critical services providers could adversely affect our operating results by subjecting us to liability, and limiting our ability to effectively monitor and control our operations, adjust to changing market conditions, or implement strategic initiatives; we are subject to complex laws and regulations, including environmental and safety regulations that can adversely affect cost, manner or feasibility of doing business; we are subject to a series of risks related to climate change; and increased attention to, and evolving expectations for, sustainability and environmental, social and governance initiatives. For a more complete description of these and other possible risks and uncertainties, please refer to the Company's Annual Report on Form 10-K for the year ended December 31, 2025, and its subsequent reports filed with the Securities and Exchange Commission. All forward-looking statements attributable to the Company or persons acting on its behalf are expressly qualified in their entirety by the foregoing cautionary statements.

INVESTOR CONTACT

Brian Perman, Vice President, Investor Relations

investors@customtruck.com

CUSTOM TRUCK ONE SOURCE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited)

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s except per share data) 2026 2025 2026 2025

Revenue

Rental revenue $ 152,696  $ 127,142  $ 434,971  $ 364,217  $ 145,060

Equipment sales 309,597  320,583  985,790  950,558  383,559

Parts sales and services 32,931  34,333  99,531  100,998  34,827

Total revenue 495,224  482,058  1,520,292  1,415,773  563,446

Cost of Revenue

Cost of rental revenue 32,553  30,434  98,465  91,172  34,847

Depreciation of rental equipment 56,918  54,775  170,042  158,873  56,927

Cost of equipment sales 263,877  268,377  827,722  793,526  319,927

Cost of parts sales and services 28,596  27,719  83,746  83,371  27,771

Total cost of revenue 381,944  381,305  1,179,975  1,126,942  439,472

Gross Profit 113,280  100,753  340,317  288,831  123,974

Operating Expenses

Selling, general and administrative expenses 56,385  54,863  175,285  173,479  61,274

Amortization 6,679  6,683  20,048  20,274  6,683

Non-rental depreciation 3,666  3,332  10,460  9,904  3,404

Transaction expenses and other 8,471  3,246  18,361  12,209  5,998

Total operating expenses 75,201  68,124  224,154  215,866  77,359

Operating Income 38,079  32,629  116,163  72,965  46,615

Other Expense

Interest expense, net 37,066  40,247  110,293  119,364  38,190

Financing and other expense (income) (394) (874) (708) (3,261) (551)

Total other expense 36,672  39,373  109,585  116,103  37,639

Income (Loss) Before Income Taxes 1,407  (6,744) 6,578  (43,138) 8,976

Income Tax Expense (Benefit) (898) (988) (2,024) 8,789  (1,423)

Net Income (Loss) $ 2,305  $ (5,756) $ 8,602  $ (51,927) $ 10,399

Net Income (Loss) Per Share

Basic $ 0.01  $ (0.03) $ 0.04  $ (0.23) $ 0.05

Diluted $ 0.01  $ (0.03) $ 0.04  $ (0.23) $ 0.05

CUSTOM TRUCK ONE SOURCE, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

(in $000s) September 30, 2026 December 31, 2025

Assets

Current Assets

Cash and cash equivalents $ 14,564  $ 6,273

Accounts receivable, net 204,900  195,541

Financing receivables, net 7,581  8,853

Inventory 1,015,714  930,939

Prepaid expenses and other 14,923  17,009

Total current assets 1,257,682  1,158,615

Property and equipment, net 162,512  142,526

Rental equipment, net 1,141,509  1,086,678

Goodwill 704,885  705,167

Intangible assets, net 205,497  225,725

Operating lease assets 114,370  110,921

Other assets 9,890  11,822

Total Assets $ 3,596,345  $ 3,441,454

Liabilities and Stockholders' Equity

Current Liabilities

Accounts payable $ 123,341  $ 88,366

Accrued expenses 88,301  69,228

Deferred revenue and customer deposits 27,822  23,500

Floor plan payables - trade 359,320  291,215

Floor plan payables - non-trade 371,234  366,208

Operating lease liabilities - current 9,345  8,955

Current maturities of long-term debt 1,235  25,858

Total current liabilities 980,598  873,330

Long-term debt, net 1,652,562  1,619,352

Operating lease liabilities - noncurrent 110,253  105,909

Deferred income taxes 31,411  33,760

Total long-term liabilities 1,794,226  1,759,021

Stockholders' Equity

Common stock 25  25

Treasury stock, at cost (124,971) (122,602)

Additional paid-in capital 1,568,218  1,559,874

Accumulated other comprehensive loss (12,773) (10,614)

Accumulated deficit (608,978) (617,580)

Total stockholders' equity 821,521  809,103

Total Liabilities and Stockholders' Equity $ 3,596,345  $ 3,441,454

CUSTOM TRUCK ONE SOURCE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

Nine Months Ended September 30,

(in $000s) 2026 2025

Operating Activities

Net income (loss) $ 8,602  $ (51,927)

Adjustments to reconcile net income (loss) to net cash flow from operating activities:

Depreciation and amortization 206,105  195,010

Amortization of debt issuance costs 3,304  3,289

Provision for losses on accounts receivable 2,937  7,429

Share-based compensation 7,879  6,259

Gain on sales and disposals of rental equipment (36,996) (32,177)

Deferred tax expense (benefit) (2,137) 6,974

Changes in assets and liabilities:

Accounts and financing receivables (3,951) 28,929

Inventories (83,378) 15,753

Prepaids, operating leases and other 3,239  5,610

Accounts payable 34,513  17,582

Accrued expenses and other liabilities 19,071  22,205

Floor plan payables - trade, net 68,105  36,675

Customer deposits and deferred revenue 4,367  1,193

Net cash flow from operating activities 231,660  262,804

Investing Activities

Purchases of rental equipment (352,578) (348,923)

Proceeds from sales and disposals of rental equipment 153,819  138,749

Purchase of non-rental property and cloud computing arrangements (34,155) (23,612)

Net cash flow for investing activities (232,914) (233,786)

Financing Activities

Borrowings under revolving credit facilities 205,414  260,581

Repayments under revolving credit facilities (193,393) (135,000)

Principal payments on long-term debt (6,739) (6,836)

Acquisition of inventory through floor plan payables - non-trade 389,183  363,907

Repayment of floor plan payables - non-trade (384,156) (468,321)

Repurchase of common stock —  (32,575)

Share-based payments (1,903) (1,453)

Net cash flow from (for) financing activities 8,406  (19,697)

Effect of exchange rate changes on cash and cash equivalents 1,139  (68)

Net Change in Cash and Cash Equivalents 8,291  9,253

Cash and Cash Equivalents at Beginning of Period 6,273  3,805

Cash and Cash Equivalents at End of Period $ 14,564  $ 13,058

Nine Months Ended September 30,

(in $000s) 2026 2025

Supplemental Cash Flow Information

Interest paid $ 96,508  $ 104,109

Income taxes paid, net 359  697

Non-Cash Investing and Financing Activities

Property and equipment purchases in accounts payable 1,520  1,508

Rental equipment sales in accounts receivable 1,415  1,355

CUSTOM TRUCK ONE SOURCE, INC.

NON-GAAP FINANCIAL AND PERFORMANCE MEASURES

In our press release and schedules, and on the related conference call, we report certain financial measures that are not required by, or presented in accordance with, United States generally accepted accounting principles (“GAAP”). We utilize these financial measures to manage our business on a day-to-day basis and some of these measures are commonly used in our industry to evaluate performance by excluding items considered to be non-recurring. We believe these non-GAAP measures provide investors expanded insight to assess performance, in addition to the standard GAAP-based financial measures. The press release schedules reconcile the most directly comparable GAAP measure to each non-GAAP measure that we refer to. Although management evaluates and presents these non-GAAP measures for the reasons described herein, please be aware that these non-GAAP measures have limitations and should not be considered in isolation or as a substitute for revenue, operating income/loss, net income/loss, earnings/loss per share or any other comparable measure prescribed by GAAP. In addition, we may calculate and/or present these non-GAAP financial measures differently than measures with the same or similar names that other companies report, and as a result, the non-GAAP measures we report may not be comparable to those reported by others.

Adjusted EBITDA. Adjusted EBITDA is a non-GAAP performance measure that we use to monitor our results of operations, to measure performance against debt covenants and performance relative to competitors. We believe Adjusted EBITDA is a useful performance measure because it allows for an effective evaluation of operating performance, without regard to financing methods or capital structures. We exclude the items identified in the reconciliations of net income (loss) to Adjusted EBITDA because these amounts are either non-recurring or can vary substantially within the industry depending upon accounting methods and book values of assets, including the method by which the assets were acquired, and capital structures. Adjusted EBITDA should not be considered as an alternative to, or more meaningful than, net income (loss) determined in accordance with GAAP. Certain items excluded from Adjusted EBITDA are significant components in understanding and assessing a company’s financial performance, such as a company’s cost of capital and tax structure, as well as the historical costs of depreciable assets, none of which are reflected in Adjusted EBITDA. Our presentation of Adjusted EBITDA should not be construed as an indication that results will be unaffected by the items excluded from Adjusted EBITDA. Our computation of Adjusted EBITDA may not be identical to other similarly titled measures of other companies.

We define Adjusted EBITDA as net income or loss before interest expense (excluding interest on floorplan financing), income taxes, depreciation and amortization, share-based compensation, and other items that we do not view as indicative of ongoing performance. Our Adjusted EBITDA includes an adjustment to exclude the effects of purchase accounting adjustments when calculating the cost of inventory and used equipment sold. When inventory or equipment is purchased in connection with a business combination, the assets are revalued to their current fair values for accounting purposes. The consideration transferred (i.e., the purchase price) in a business combination is allocated to the fair values of the assets as of the acquisition date, with amortization or depreciation recorded thereafter following applicable accounting policies; however, this may not be indicative of the actual cost to acquire inventory or new equipment that is added to product inventory or the rental fleets apart from a business acquisition. We also include an adjustment to remove the impact of accounting for certain of our rental contracts with customers containing a rental purchase option that are accounted for under GAAP as a sales-type lease. We include this adjustment because we believe continuing to reflect the transactions as an operating lease better reflects the economics of the transactions given our large portfolio of rental contracts. These, and other, adjustments to GAAP net income or loss that are applied to derive Adjusted EBITDA are specified by our senior secured credit agreement and the indenture of our senior secured notes.

Adjusted Gross Profit. We present total gross profit excluding rental equipment depreciation (“Adjusted Gross Profit”) as a non-GAAP financial performance measure. This measure differs from the GAAP definition of gross profit, as we do not include the impact of depreciation expense, which represents non-cash expense. We use this measure to evaluate operating margins and the effectiveness of the cost of our rental fleet.

Net Debt. We present the non-GAAP financial measure “Net Debt,” which is total debt (the most comparable GAAP measure, calculated as current and long-term debt, excluding deferred financing fees, plus current and long-term finance lease obligations) minus cash and cash equivalents. We believe this non-GAAP measure is useful to investors to evaluate our financial position.

Net Leverage Ratio. Net leverage ratio is a non-GAAP performance measure used by management and we believe it provides useful information to investors because it is an important measure to evaluate our debt levels and progress toward leverage targets, which is consistent with the manner our lenders and management use this measure. We define net leverage ratio as net debt divided by Adjusted EBITDA for the previous twelve-month period (“last twelve months,” or “LTM”).

CUSTOM TRUCK ONE SOURCE, INC.

ADJUSTED EBITDA RECONCILIATION

(unaudited)

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Net income (loss) $ 2,305  $ (5,756) $ 8,602  $ (51,927) $ 10,399

Interest expense 26,247  26,462  77,816  78,518  27,051

Income tax expense (benefit) (898) (988) (2,024) 8,789  (1,423)

Depreciation and amortization 69,068  67,048  206,312  195,985  68,970

EBITDA 96,722  86,766  290,706  231,365  104,997

Adjustments:

Non-cash purchase accounting impact (1)

1,747  3,406  7,715  11,502  2,736

Transaction and integration costs (2)

8,471  3,246  18,361  12,209  5,998

Sales-type lease adjustment (3)

733  465  1,021  1,482  (408)

Share-based payments (4)

3,269  2,080  7,879  6,259  3,431

Adjusted EBITDA $ 110,942  $ 95,963  $ 325,682  $ 262,817  $ 116,754

Adjusted EBITDA is defined as net income (loss), as adjusted for provision for income taxes, interest expense, net (excluding interest on floorplan financing), depreciation of rental equipment and non-rental depreciation and amortization, and further adjusted for the impact of the fair value mark-up of acquired rental fleet, business acquisition and merger-related costs, including integration, the impact of accounting for certain of our rental contracts with customers that are accounted for under GAAP as sales-type lease and stock compensation expense. This non-GAAP measure is subject to certain limitations.

(1)    Represents the non-cash impact of purchase accounting, net of accumulated depreciation, on the cost of equipment and inventory sold. The equipment and inventory acquired received a purchase accounting step-up in basis, which is a non-cash adjustment to the equipment cost pursuant to our ABL Credit Agreement and Indenture.

(2)    Represents transaction and other costs related to acquisitions of businesses; costs associated with closed operations; costs associated with restructuring and business optimization activities (inclusive of systems establishment costs); employee retention and/or severance costs; costs related to start-up/pre-openings and openings of locations; reconfiguration or consolidation of facilities or equipment conversion costs. These adjustments are presented as adjustments to net income (loss) pursuant to our ABL Credit Agreement and Indenture.

(3)    Represents the impact of sales-type lease accounting for certain leases containing rental purchase options (or “RPOs”), as the application of sales-type lease accounting is not deemed to be representative of the ongoing cash flows of the underlying rental contracts. The adjustments are made pursuant to our ABL Credit Agreement and Indenture. The components of this adjustment are presented in the table below:

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Equipment sales $ 1,142  $ (383) $ (4,070) $ (3,528) $ (5,942)

Cost of equipment sales (1,400) 118  1,417  2,906  4,461

Gross margin (258) (265) (2,653) (622) (1,481)

Interest (income) expense (395) (872) (708) (3,206) (550)

Rental invoiced 1,386  1,602  4,382  5,310  1,623

Sales-type lease adjustment $ 733  $ 465  $ 1,021  $ 1,482  $ (408)

(4) Represents non-cash share-based compensation expense associated with the issuance of restricted stock units.

Reconciliation of Adjusted Gross Profit

(unaudited)

The following table presents the reconciliation of Adjusted Gross Profit:

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Revenue

Rental revenue $ 152,696  $ 127,142  $ 434,971  $ 364,217  $ 145,060

Equipment sales 309,597  320,583  985,790  950,558  383,559

Parts sales and services 32,931  34,333  99,531  100,998  34,827

Total revenue 495,224  482,058  1,520,292  1,415,773  563,446

Cost of Revenue

Cost of rental revenue 32,553  30,434  98,465  91,172  34,847

Depreciation of rental equipment 56,918  54,775  170,042  158,873  56,927

Cost of equipment sales 263,877  268,377  827,722  793,526  319,927

Cost of parts sales and services 28,596  27,719  83,746  83,371  27,771

Total cost of revenue 381,944  381,305  1,179,975  1,126,942  439,472

Gross Profit 113,280  100,753  340,317  288,831  123,974

Add: depreciation of rental equipment 56,918  54,775  170,042  158,873  56,927

Adjusted Gross Profit $ 170,198  $ 155,528  $ 510,359  $ 447,704  $ 180,901

Reconciliation of SER Segment Adjusted Gross Profit and Adjusted Rental Gross Profit

(unaudited)

The following table presents the reconciliation of SER segment Adjusted Gross Profit:

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Revenue

Rental revenue $ 152,696  $ 127,142  $ 434,971  $ 364,217  $ 145,060

Equipment sales 39,446  34,565  128,882  104,081  51,659

Parts sales and services 19,891  21,182  60,762  64,500  22,100

Intersegment sales 8,121  3,864  19,024  31,190  4,113

Total revenue 220,154  186,753  643,639  563,988  222,932

Cost of Revenue

Cost of rental revenue 32,553  30,434  98,465  91,172  34,847

Cost of equipment sales 29,213  25,061  93,992  74,546  36,565

Cost of parts and services 17,444  18,064  53,429  57,254  17,966

Depreciation of rental equipment 56,918  54,775  170,042  158,873  56,927

Intersegment cost of sales 7,432  3,864  17,270  31,190  3,728

Total cost of revenue 143,560  132,198  433,198  413,035  150,033

Gross profit 76,594  54,555  210,441  150,953  72,899

Add: depreciation of rental equipment 56,918  54,775  170,042  158,873  56,927

Adjusted Gross Profit $ 133,512  $ 109,330  $ 380,483  $ 309,826  $ 129,826

The following table presents the reconciliation of SER segment Adjusted Rental Gross Profit:

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2026

(in $000s) 2026 2025 2026 2025

Rental revenue $ 152,696  $ 127,142  $ 434,971  $ 364,217  $ 145,060

Cost of rental revenue 32,553  30,434  98,465  91,172  34,847

Adjusted Rental Gross Profit $ 120,143  $ 96,708  $ 336,506  $ 273,045  $ 110,213

Reconciliation of Net Debt

(unaudited)

The following table presents the reconciliation of Net Debt:

(in $000s) September 30, 2026 June 30, 2026 December 31, 2025 September 30, 2025

Current maturities of long-term debt $ 1,235  $ 3,209  $ 25,858  $ 20,892

Long-term debt, net 1,652,562  1,656,652  1,619,352  1,628,866

Deferred financing fees 12,246  13,353  15,549  16,638

Less: cash and cash equivalents (14,564) (10,287) (6,273) (13,058)

Net Debt $ 1,651,479  $ 1,662,927  $ 1,654,486  $ 1,653,338

Reconciliation of Net Leverage Ratio

(unaudited)

The following table presents the reconciliation of the Net Leverage Ratio:

Twelve Months Ended

(in $000s) September 30, 2026 June 30, 2026 December 31, 2025 September 30, 2025

Net Debt (as of period end) $ 1,651,479  $ 1,662,927  $ 1,654,486  $ 1,653,338

Divided by: LTM Adjusted EBITDA (1)

$ 446,423  $ 431,444  $ 383,558  $ 364,837

Net Leverage Ratio 3.70  3.85  4.31  4.53

(1) The following tables present the calculation of LTM Adjusted EBITDA for the periods ended September 30, 2026, June 30, 2026, December 31, 2025 and September 30, 2025:

Current Year To Date Period Less: Prior Year To Date Period Add: Prior Fiscal Year LTM Adjusted EBITDA

(in $000s) September 30, 2026 September 30, 2025 December 31, 2025 September 30, 2026

Net income (loss) $ 8,602  $ (51,927) $ (31,052) $ 29,477

Interest expense 77,816  78,518  104,882  104,180

Income tax expense (benefit) (2,024) 8,789  2,922  (7,891)

Depreciation and amortization 206,312  195,985  264,998  275,325

EBITDA 290,706  231,365  341,750  401,091

Adjustments:

Non-cash purchase accounting impact 7,715  11,502  15,469  11,682

Transaction and integration costs 18,361  12,209  16,639  22,791

Sales-type lease adjustment 1,021  1,482  1,229  768

Share-based payments 7,879  6,259  8,471  10,091

Adjusted EBITDA $ 325,682  $ 262,817  $ 383,558  $ 446,423

Current Year To Date Period Less: Prior Year To Date Period Add: Prior Fiscal Year LTM Adjusted EBITDA

(in $000s) June 30, 2026 June 30, 2025 December 31, 2025 June 30, 2026

Net income (loss) $ 6,297  $ (46,171) $ (31,052) $ 21,416

Interest expense 51,569  52,056  104,882  104,395

Income tax expense (benefit) (1,126) 9,777  2,922  (7,981)

Depreciation and amortization 137,244  128,937  264,998  273,305

EBITDA 193,984  144,599  341,750  391,135

Adjustments:

Non-cash purchase accounting impact 5,968  8,096  15,469  13,341

Transaction and integration costs 9,890  8,963  16,639  17,566

Sales-type lease adjustment 288  1,017  1,229  500

Share-based payments 4,610  4,179  8,471  8,902

Adjusted EBITDA $ 214,740  $ 166,854  $ 383,558  $ 431,444

Current Year To Date Period Less: Prior Year To Date Period Add: Prior Fiscal Year LTM Adjusted EBITDA

(in $000s) September 30, 2025 September 30, 2024 December 31, 2024 September 30, 2025

Net income (loss) $ (51,927) $ (56,229) $ (28,655) $ (24,353)

Interest expense 78,518  79,174  105,895  105,239

Income tax expense (benefit) 8,789  518  (532) 7,739

Depreciation and amortization 195,985  173,253  235,807  258,539

EBITDA 231,365  196,716  312,515  347,164

Adjustments: —

Non-cash purchase accounting impact 11,502  12,286  16,833  16,049

Transaction and integration costs 12,209  14,684  17,915  15,440

Sales-type lease adjustment 1,482  5,730  4,559  311

Gain on sale leaseback transaction —  —  (23,497) (23,497)

Share-based payments 6,259  8,748  11,859  9,370

Change in fair value of warrants —  (527) (527) —

Adjusted EBITDA $ 262,817  $ 237,637  $ 339,657  $ 364,837

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Oct. 26, 2026

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Document Period End Date

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Entity Registrant Name

CUSTOM TRUCK ONE SOURCE, INC.

Entity Incorporation, State or Country Code

DE

Entity File Number

001-38186

Entity Tax Identification Number

84-2531628

Entity Address, Address Line One

7701 Independence Avenue

Entity Address, City or Town

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City Area Code

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Local Phone Number

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Area code of city

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Cover page.

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Address Line 1 such as Attn, Building Name, Street Name

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Name of the City or Town

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Code for the postal or zip code

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Name of the state or province.

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Indicate if registrant meets the emerging growth company criteria.

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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Two-character EDGAR code representing the state or country of incorporation.

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The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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Local phone number for entity.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

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Title of a 12(b) registered security.

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Name of the Exchange on which a security is registered.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

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Trading symbol of an instrument as listed on an exchange.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

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