Custom Truck One Source, Inc. (CTOS)

Executive Summary / Key Takeaways

• Record rental performance meets secular megatrends: CTOS's Equipment Rental Solutions segment delivered 17% revenue growth in 2025 with utilization hitting 83.6% in Q4, the highest in nearly three years, driven by unprecedented demand from AI data center power infrastructure and grid modernization projects that management expects to persist through 2026 and beyond.

• Balance sheet repair creates asymmetric upside: After investing over $250 million in fleet expansion in 2025, CTOS is pivoting to capital efficiency in 2026 with net rental capex dropping to $150-170 million, targeting >$50 million in free cash flow and net leverage below 4x by year-end, which could drive significant equity value if execution holds.

• TES segment faces margin pressure but backlog signals demand durability: While Truck and Equipment Sales gross margins compressed to 15.6% in 2025 due to supply/demand imbalances, the segment still posted record annual revenue of $1.1 billion and ended the year with a $335 million backlog up 20% sequentially, suggesting pricing power recovery as market conditions normalize.

• Niche specialization vs. scale disadvantage: CTOS's young, specialized fleet (2.9 years average age) and integrated rental-sales-aftermarket model create customer stickiness in utility markets, but its 4.3x net leverage and sub-5% market share position it as a high-beta play compared to better-capitalized giants like United Rentals (URI) and Herc Holdings (HRI).

• The deleveraging path is the critical variable: The investment thesis hinges on management's ability to convert record rental KPIs into sustainable free cash flow while reducing debt from $1.65 billion to the 3x target by 2027; any slip in utilization, TES margin recovery, or inventory reduction could impact the leverage trajectory and the stock's valuation multiple.

Setting the Scene: The Infrastructure Value Chain's Specialist

Founded in 1988 and headquartered in Kansas City, Missouri, Custom Truck One Source operates a differentiated "one-stop-shop" model across over 40 locations in the U.S. and Canada, serving the infrastructure development value chain through three integrated pillars: equipment rental, new and used equipment sales, and aftermarket parts and services. The company provides specialized, truck-mounted equipment—digger derricks , aerial lifts, cranes, and service trucks—essential for electric utility transmission and distribution (T&D), telecommunications, rail, and waste management end markets. This specialization positions CTOS at the nexus of several converging secular megatrends redefining North American infrastructure demand.

The industry structure reveals why CTOS's niche focus creates both opportunity and vulnerability. The North American equipment rental market is dominated by three giants: United Rentals with approximately 65% market share, Herc Holdings at roughly 18%, and Ashtead Group's (ASHTY) Sunbelt Rentals commanding 20-25% of the remainder. CTOS holds under 5% share, but its fleet is purpose-built for utility infrastructure rather than general construction. The utility T&D market is experiencing a structural shift from equipment ownership to rental, driven by contractor preferences for avoiding capital outlay and accessing specialized, modern equipment. CTOS's average fleet age of 2.9 years—materially younger than the industry standard—translates into higher utilization, lower maintenance costs, and superior pricing power in a market where downtime is the enemy of project economics.

The demand drivers are significant. The Infrastructure Investment and Jobs Act (IIJA), signed in November 2021, allocated $1.2 trillion in spending, with over 75% of funds allocated by September 2025 but less than 50% spent, creating a funding pipeline that extends through 2027. More critically, AI data center growth is projected to increase U.S. electricity demand from 40 gigawatts in 2025 to 106 gigawatts by 2035—a 165% increase that utilities must support through massive T&D capex. U.S. investor-owned utilities are projected to spend $102 billion on T&D in 2025 alone, with the five-year total reaching $600 billion through 2029. This spending wave represents a multi-year, secular buildout of power infrastructure that CTOS's specialized fleet is positioned to capture. The company's ability to reposition equipment nationally in response to regional demand shifts creates a utilization advantage that static, regional competitors cannot replicate.

Technology, Products, and Strategic Differentiation: The Young Fleet Moat

CTOS's competitive advantage begins with its rental fleet composition. The company owns over 10,400 units with an Original Equipment Cost (OEC) of $1.64 billion as of December 31, 2025, representing a 14% year-over-year increase in average OEC on rent. The fleet is concentrated in high-demand categories like truck-mounted aerial lifts, digger derricks, and specialized service trucks that command premium rental rates in T&D markets. The 2.9-year average age directly impacts maintenance capex, repair costs, and customer preference for reliable equipment. A younger fleet experiences fewer breakdowns, commands higher pricing, and generates superior margins—CTOS's rental adjusted gross margin hit 62% in Q3 2025, up 370 basis points year-over-year.

The integrated business model amplifies this advantage. Unlike pure rental companies that must auction used equipment, CTOS's direct-to-customer sales channels generate attractive net resale values while simultaneously creating aftermarket service relationships. When a utility contractor rents a digger derrick for a transmission line project and later exercises a rental purchase option, CTOS captures the equipment sale, establishes a parts and service relationship, and often replaces the unit with a newer rental asset. This transforms a transactional rental into a multi-year customer relationship with recurring revenue streams. The aftermarket parts and services segment, while smaller at $133 million in 2025 revenue, provides a sticky revenue base that competitors who sell through auctions cannot replicate.

National fleet management capabilities create a logistical moat. CTOS can efficiently reposition equipment across its 40+ locations to capture regional demand spikes, maintaining utilization rates that peaked at 83.6% in Q4 2025. Utilization is the primary driver of rental ROI, as every percentage point translates directly to revenue and EBITDA. While United Rentals achieves scale through location density, CTOS achieves efficiency through specialization and mobility. The company's 24/7 call center, approximately 90 mobile technicians, and over 2,600 third-party service partners create a support infrastructure that utility customers, operating on emergency restoration timelines, value highly.

Financial Performance: Evidence of Strategy Working

The 2025 results validate CTOS's positioning. Consolidated revenue reached $1.944 billion, up 8% year-over-year, while adjusted EBITDA grew 13% to $384 million, surpassing guidance midpoint. This EBITDA outperformance demonstrates operating leverage, as revenue growth of 8% translating to 13% EBITDA growth indicates that incremental revenue is falling through at higher margins. The primary driver was Equipment Rental Solutions, where revenue surged 17% to $701 million on the back of a 14% increase in average OEC on rent and a 510 basis point improvement in fleet utilization to 79.4% for the full year.

The rental segment's KPI trajectory shows consistent strength. Average OEC on rent accelerated throughout 2025, reaching $1.38 billion in Q4. Q4 utilization of 83.6% represented a 470 basis point improvement over Q4 2024 and the highest level in nearly three years. Utilization above 80% in the specialty equipment rental industry typically signals pricing power and capacity constraints that allow for rate increases. Management confirmed this dynamic, noting that on-rent yield remained in the targeted upper-30s to low-40s range at 38.7% in Q4, with price increases implemented at year-end beginning to flow through.

Truck and Equipment Sales (TES) posted record annual revenue of $1.1 billion, up 4% year-over-year. However, Q4 revenue declined 8% year-over-year as some customers pulled forward capital spending earlier in the year to anticipate tariffs and price increases, while others deferred deliveries into 2026. This creates a timing distortion that masks underlying demand health. The segment ended 2025 with a backlog of $335 million, up $55 million (20%) from Q3, and management reported that backlog continued growing to approximately $370 million in early 2026. Strong intra-quarter order flow from local and regional customers—up over 40% year-over-year—suggests the Q4 softness was temporal.

Gross margin dynamics reveal the competitive environment. TES Q4 gross margin of 15.6% was the highest of the year, but still below the 15-18% target range. The pressure stems from elevated supply of vocational vehicles across the market, which forces price competition. TES represents 57% of total revenue, and margin recovery is essential for consolidated EBITDA expansion. Management expects improvement as supply and demand rebalance. Meanwhile, ERS rental adjusted gross margins reached 62% in Q3, demonstrating that the rental business can help mitigate TES weakness as it grows as a percentage of the mix.

The balance sheet shows progress. Net debt stood at $1.65 billion at year-end, resulting in net leverage of 4.3x—an improvement from the Q1 2025 high of 4.8x. This deleveraging reduces financial risk and interest expense, though 4.3x remains elevated compared to URI's 1.75x. The company generated $310 million in operating cash flow in 2025, a significant increase from $122 million in 2024, driven primarily by lower inventory production levels. Free cash flow remained negative at -$107.6 million due to $282.5 million in investing activities, primarily rental fleet purchases.

Outlook, Guidance, and Execution Risk

Management's 2026 guidance reflects confidence in the rental business and caution on TES recovery. The company projects revenue of $2.005-2.12 billion and adjusted EBITDA of $410-435 million. This implies EBITDA margin expansion of approximately 50-100 basis points, suggesting management expects TES margins to recover and rental mix to improve. The segment-level guidance indicates management is prioritizing capital allocation toward the higher-margin rental business while maintaining TES scale.

The capital expenditure pivot is a significant strategic shift. Net rental capex is expected to drop to $150-170 million in 2026, down from over $250 million in 2025. This demonstrates management's confidence that the fleet is appropriately sized, frees up approximately $100 million in cash flow for debt reduction, and signals that fleet aging can be managed flexibly given the current 2.9-year average age. Non-rental capex of $40-50 million represents just 2-2.5% of revenue.

The new segment reporting structure, effective Q1 2026, will split the business into Specialty Equipment Rentals (SER) and Specialty Truck Equipment and Manufacturing (STEM). This provides clearer visibility into the distinct economic drivers and capital intensity of each business. SER will combine the high-margin rental operations with portions of aftermarket services, while STEM will house the equipment sales and manufacturing activities. This change allows for a clearer basis of comparison to industry peers.

Execution risks center on three variables. First, maintaining utilization above 80% while growing the fleet only mid-single digits is critical; any demand softening in T&D markets would pressure revenue and pricing. Second, TES margins must recover to the 15-18% target range, which depends on market supply normalization. Third, the company aims to reduce inventory to a sub-six-month target, requiring careful management of working capital without disrupting customer deliveries.

Risks and Asymmetries: What Can Break the Thesis

The debt burden remains a primary risk factor. With net leverage at 4.3x and total debt of $1.65 billion, CTOS has limited financial flexibility. Variable rate indebtedness exposes the company to interest rate risk—a 1/8 percentage point change in rates alters annual interest expense by approximately $1.7 million. In a sustained high-rate environment, interest expense could consume a notable portion of EBITDA, limiting cash flow available for debt reduction. The company's interest coverage ratio is thin, and any EBITDA decline could push leverage higher, potentially restricting access to capital.

Customer concentration and backlog risk create revenue volatility. While CTOS serves a diverse base of utility contractors, the TES segment's $335 million backlog is subject to cancellation or deferral. Q4 2025 performance was impacted by customers pulling forward purchases and deferring deliveries, demonstrating that backlog does not guarantee immediate revenue. TES represents the majority of revenue, and macroeconomic uncertainty around tariffs, interest rates, or utility spending could lead to order cancellations.

Supply chain dependencies pose operational risk. CTOS relies on timely delivery of commercial vehicle chassis from OEMs to fulfill both rental fleet additions and TES sales. Disruptions in chassis availability could limit the company's ability to meet demand. While CTOS maintains relationships with OEMs and carries strategic inventory, a prolonged supply disruption would pressure revenue and could impact deleveraging targets.

Competitive dynamics from better-capitalized rivals threaten market share. United Rentals, with its significant market share and enterprise value, can compete aggressively on price in utility segments. Herc Holdings' acquisition of H&E Equipment Services (HEES) has created an entity with enhanced scale in specialty rentals. These competitors have lower cost of capital and greater geographic density, which could allow them to undercut CTOS on rental rates. CTOS's moat is its specialization, but if larger players replicate its product offerings, margin pressure could intensify.

The secular demand thesis faces execution risk. The AI data center buildout and grid modernization require qualified technicians and project management capabilities. CTOS's ability to scale its service capacity through regional expansions will determine whether it can capture its share of the $600 billion T&D capex opportunity. Infrastructure projects have long lead times and complex requirements; failure to execute could mean the opportunity accrues to larger competitors.

Valuation Context: Pricing the Inflection

At $6.59 per share, CTOS trades at an enterprise value of $3.9 billion, representing 2.01x trailing revenue and 20.57x trailing EBITDA. These multiples position CTOS at a discount to larger peers despite growth. United Rentals trades at 3.81x revenue and 13.77x EBITDA, while Herc Holdings trades at 2.93x revenue and 14.17x EBITDA. CTOS's lower revenue multiple reflects its smaller scale and higher leverage, but the 20.57x EBITDA multiple suggests the market is pricing in significant EBITDA growth.

The price-to-operating cash flow ratio of 4.82x appears lower than URI's 8.89x, suggesting cash generation potential. However, CTOS's operating cash flow of $310 million in 2025 was boosted by a $100+ million inventory reduction. The negative free cash flow of -$107.6 million reveals that after accounting for fleet investment, the business has been consuming cash. Valuation multiples based on operating cash flow can be deceptive for asset-intensive businesses; sustainable free cash flow after maintenance capex is the more critical metric.

The debt-to-equity ratio of 2.99x is elevated but improving. For comparison, URI's debt-to-equity is 1.75x, while HRI's is 4.97x. CTOS's leverage limits financial flexibility and increases equity risk. If the company achieves its target of 3x leverage by 2027, the equity value could expand as the risk premium compresses. However, if leverage remains above 4x, the stock may continue trading at a discount to peers.

Return on assets of 2.55% and negative return on equity of -3.72% reflect the debt burden and recent investments in fleet growth. These metrics demonstrate that CTOS has not yet reached its efficient scale. As the fleet ages and debt decreases, ROA should improve, while ROE could turn positive if leverage is managed down. The market is pricing CTOS as an inflection story, creating upside if the deleveraging plan succeeds.

Conclusion: The Deleveraging Path Decides the Story

Custom Truck One Source sits at the intersection of a secular infrastructure supercycle creating demand for specialized utility equipment and a balance sheet repair story that could unlock equity value. The 2025 results provide evidence that the rental business is performing well—record utilization, expanding OEC, and improving margins demonstrate that CTOS's specialized fleet and integrated model create competitive advantages in the utility T&D market. The $600 billion five-year T&D capex pipeline, driven by AI data center power demand and grid modernization, provides a multi-year growth runway.

The investment thesis is about whether management can convert record operational metrics into sustainable free cash flow while deleveraging the balance sheet. The 2026 guidance—mid-single-digit fleet growth, $150-170 million in net rental capex, and a target of <4x leverage—sets a path to >$50 million in free cash flow. If achieved, this would represent a fundamental inflection from cash consumption to cash generation, likely triggering a re-rating of the stock's valuation multiple.

The critical variables to monitor are utilization sustainability, TES margin recovery, and debt reduction execution. Q1 2026 performance will be telling: management expects mid- to high-single-digit revenue growth and double-digit EBITDA growth, primarily driven by the rental business. If utilization holds above 80% and TES margins show sequential improvement, the thesis remains intact. If leverage drops below 4x by year-end, the risk premium should compress, potentially driving the stock toward peer-level valuation multiples.

The asymmetry is notable: downside is supported by the company's young fleet, specialized market position, and secular demand tailwinds, while upside is amplified by the potential for multiple expansion as debt declines. CTOS offers a combination of operational momentum and financial leverage that could generate significant returns as the infrastructure supercycle plays out.