CTOS

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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

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EXHIBIT 99.1

Custom Truck One Source, Inc. Reports Fourth Quarter and Full-Year 2025 Results

KANSAS CITY, Mo. March 10, 2026 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today reported financial results for the fourth quarter and full year ended December 31, 2025. All comparisons are to the comparable period in the prior year unless otherwise noted.

CTOS Fourth-Quarter and Full-Year Highlights

•Record fourth quarter revenue of $528.2 million, an increase of $7.4 million or 1.4%, compared to the fourth quarter of 2024

•Record full-year revenue of $1,944.0 million, an increase of 7.9%, compared to 2024

•Quarterly net income of $20.9 million, compared to net income of $27.6 million for the fourth quarter of 2024

•Full-year net loss of $31.1 million compared to a net loss of $28.7 million in 2024

•Quarterly Adjusted EBITDA of $120.7 million, an increase of $18.7 million or 18.4%, compared to the fourth quarter of 2024

•Full-year Adjusted EBITDA of $383.6 million, an increase of $43.9 million, or 12.9%, compared to 2024 full-year Adjusted EBITDA of $339.7 million

•Quarterly average OEC on rent increased by $165.9 million, or 13.7%, compared to the fourth quarter of 2024

•Full-year average OEC on rent increased by $154.8 million, or 14.1%, compared to 2024

•Fleet utilization of 83.6% (highest in nearly three years)

•Sales order backlog ended the year at $335.3 million, up $55.5 million sequentially

“In the fourth quarter, we achieved record quarterly revenue, as well as sequential and year-over-year improvement in both revenue and Adjusted EBITDA, delivering 18% Adjusted EBITDA growth in the quarter and 13% for the full year. The significant improvements in our core T&D markets that we experienced in the third quarter continued into the fourth quarter, positioning our ERS segment to finish the year with 20% revenue growth in the fourth quarter and 17% for the full year. For the quarter, our rental fleet achieved average utilization of almost 84%, the highest levels in nearly three years. We ended the year with total OEC of $1.64 billion, the highest in our history, which should support our expected growth within ERS in 2026,” said Ryan McMonagle, Chief Executive Officer of CTOS. “TES finished the year with strong performance, achieving record annual revenue of just under $1.1 billion, up 4% for the full year. Anticipated seasonal trends, as well as sustained demand for vocational vehicles across our end markets continued to drive record performance within the TES segment. We made progress reducing our inventory in the fourth quarter, with inventory declining more than $100 million, which sets us up well for 2026, as we remain focused on working capital management, free cash flow generation and continued deleveraging. We are optimistic about 2026, as CTOS is well-positioned to benefit from secular tailwinds driven by data center investments, electrification, infrastructure investment and utility grid upgrades, leading to another year of expected growth across our segments,” McMonagle added.

Summary Financial Results

Three Months Ended December 31,Twelve Months Ended December 31, Three Months

Ended

September 30, 2025

(in $000s)2025202420252024

Rental revenue$141,981 $125,461 $506,198 $442,953 $127,142

Equipment sales353,925 359,325 1,304,483 1,223,036 320,583

Parts sales and services32,278 35,954 133,276 136,291 34,333

Total revenue528,184 520,740 1,943,957 1,802,280 482,058

Gross profit$123,061 $118,465 $411,892 $390,270 $100,753

Adjusted Gross Profit1 $179,823 $167,633 $627,527 $573,723 $155,528

Net income$20,875 $27,574 $(31,052)$(28,655)$(5,756)

Adjusted EBITDA1 $120,741 $102,020 $383,558 $339,657 $95,963

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 later in this press release.

Summary Financial Results by Segment

Through the twelve months ended December 31, 2025, our results are reported for our three segments: Equipment Rental Solutions (“ERS”), Truck and Equipment Sales (“TES”) and Aftermarket Parts and Services (“APS”). ERS encompasses our core rental business, inclusive of sales of used rental equipment to our customers. TES encompasses our specialized truck and equipment production and new equipment sales activities. APS encompasses sales and rentals of parts, tools and other supplies to our customers, as well as our aftermarket repair service operations.

Equipment Rental Solutions

Three Months Ended December 31,Twelve Months Ended December 31, Three Months

Ended

September 30, 2025

(in $000s)2025202420252024

Rental revenue$137,152 $120,863 $4