CTOS

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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)2026202520262025

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

Equipment sales309,597 320,583 985,790 950,558 383,559

Parts sales and services32,931 34,333 99,531 100,998 34,827

Total revenue495,224 482,058 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

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EXHIBIT 99.1

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

KANSAS CITY, Mo. August 3, 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 six months ended June 30, 2026.

CTOS Second-Quarter Highlights

•Record second quarter revenue of $563.4 million, an increase of $52.0 million, or 10.2%, compared to the second quarter of 2025

•Increased Average OEC on rent by $158.5 million, or 13.1%, compared to the second quarter of 2025

•Gross profit of $124.0 million, an increase of $21.4 million, or 20.9%, compared to the second quarter of 2025

•Adjusted Gross Profit of $180.9 million, an increase of $24.4 million, or 15.6%, compared to the second quarter of 2025

•Net income of $10.4 million, an improvement of $38.8 million, compared to the second quarter of 2025

•Adjusted EBITDA of $116.8 million, an increase of $23.3 million, or 25.0%, compared to the second quarter of 2025

•Reduced net leverage ratio to 3.85x at quarter-end, crossing below 4.0x, compared to 4.02x at the end of the first quarter and 4.31x at year-end 2025

•Given strong conditions in the transmission and distribution (“T&D”) end markets, and record first half results, increasing 2026 full year revenue guidance range from $2.005 billion - $2.12 billion to $2.1 billion - $2.2 billion and Adjusted EBITDA1 guidance range from $415 million - $440 million to $437.5 million - $455 million

“In the second quarter, we delivered record quarterly revenue and substantial year-over-year growth in revenue and Adjusted EBITDA of 10% and 25%, respectively. Sustained strength in our core T&D markets remains the primary driver of performance within our SER segment and for the Company as a whole. Our rental fleet achieved average utilization of 81.6% for the quarter, up 400 basis points from a year ago, and we ended the quarter with total OEC of $1.68 billion, the highest quarter-end level in our history, positioning us for continued SER growth through the balance of 2026,” said Ryan McMonagle, Chief Executive Officer of CTOS. “STEM also had a record quarter, with external customer revenue of $345 million and equipment sales of $332 million. The strength across both segments allowed us to continue making substantial progress in reducing our net leverage. We are optimistic about the second half of 2026, as CTOS remains well-positioned to benefit from secular tailwinds in data center investment, electrification, utility grid upgrades and infrastructure spending. We remain focused on Adjusted EBITDA growth, working capital management, free cash flow generation and continued deleveraging,” McMonagle added.

Summary Actual Consolidated Financial Results

Three Months Ended June 30,Six Months Ended June 30,Three Months Ended March 31, 2026

(in $000s)2026202520262025

Rental revenue$145,060 $120,814 $282,275 $237,075 $137,215

Equipment sales383,559 356,112 676,193 629,975 292,634

Parts sales and services34,827 34,557 66,600 66,665 31,773

Total revenue563,446 511,483 1,025,068 933,715 461,622

Gross Profit$123,974 $102,542 $227,037 $188,078 $103,063

Adjusted Gross Profit1 $180,901 $156,549 $340,161 $292,176 $159,260

Net Income (Loss)$10,399 $(28,380)$6,297 $(46,171)$(4,102)

Adjusted EBITDA1 $116,754 $93,428 $214,740 $166,854 $97,986

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 Sa

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EXHIBIT 99.1

Custom Truck One Source, Inc. Reports First Quarter 2026 Results and Increases Adjusted EBITDA 2026 Guidance

KANSAS CITY, Mo. April 27, 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 months ended March 31, 2026.

CTOS First-Quarter Highlights

•Record first quarter revenue of $461.6 million, an increase of $39.4 million, or 9.3%, compared to the first quarter of 2025

•Increased Average OEC on rent by $141.4 million, or 11.8%, compared to the first quarter of 2025

•Gross profit of $103.1 million, an increase of $17.5 million, or 20.5%, compared to the first quarter of 2025

•Adjusted Gross Profit of $159.3 million, an increase of $23.6 million, or 17.4%, compared to the first quarter of 2025

•Net loss of $4.1 million, an improvement of $13.7 million, or 76.9%, compared to the first quarter of 2025

•Adjusted EBITDA of $98.0 million, an increase of $24.6 million, or 33.4%, compared to the first quarter of 2025

•Given strong conditions in the transmission and distribution (“T&D”) end markets, increasing 2026 full year Adjusted EBITDA1 guidance range from $410M - $435M to $415M - $440M

“In the first quarter, we achieved record first-quarter revenue and delivered substantial year-over-year growth in revenue and Adjusted EBITDA of 9% and 33%, respectively. The sustained performance in our core T&D markets continues to be the primary driver of performance within our SER segment and for the Company as a whole. For the quarter, our rental fleet achieved average utilization of 81.4%, up 370 basis points versus the first quarter of last year. We ended the quarter with total OEC of $1.66 billion, the highest in our history, which should support our expected growth within SER in 2026,” said Ryan McMonagle, Chief Executive Officer of CTOS. “Our STEM segment also had a strong quarter, delivering revenue of $268 million, which excludes $95 million of sales to our SER segment. Our strong performance in the quarter allowed us to make substantial progress in reducing our net leverage, down almost 30 basis points versus the end of the previous quarter. We continue to be optimistic about the remainder of 2026, as CTOS remains well-positioned to benefit from secular tailwinds driven by data center investments, electrification, utility grid upgrades and infrastructure investment. For 2026, we remain focused on Adjusted EBITDA growth, working capital management, free cash flow generation and continued deleveraging.” McMonagle added.

Summary Actual Consolidated Financial Results

Three Months Ended March 31,Three Months Ended December 31, 2025

(in $000s)20262025

Rental revenue$137,215 $116,261 $141,981

Equipment sales292,634 273,863 353,925

Parts sales and services31,773 32,108 32,278

Total revenue461,622 422,232 528,184

Gross Profit$103,063 $85,536 $123,061

Adjusted Gross Profit1 $159,260 $135,627 $179,823

Net Income (Loss)$(4,102)$(17,791)$20,875

Adjusted EBITDA1 $97,986 $73,426 $120,741

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 will consist 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 Adjuste