Custom Truck One Source (CTOS) Stock Can Q3 Earnings Justify Its Rally

Custom Truck One Source came into this Q3 2026 report with a stock that had already been grinding higher in recent weeks. Then the release hit and the shares jumped about 17% in a single session. That is a big move for a rental and equipment manufacturing business and it reflects one main story.

The headline is margin power. Adjusted EBITDA reached about US$111 million on roughly US$495 million of revenue, and the rental segment delivered EBITDA margins in the mid 50s. The market reacted quickly to the report. Your task now is to judge whether that reaction fits the underlying earnings quality and the balance sheet trade offs behind it.

Impressed by Custom Truck One Source’s rental margins but unsure how repeatable that kind of earnings power is for a capital heavy business? Compare this setup with our screener of companies that pair strong profitability with sturdier balance sheets in the list of solid balance sheet and fundamentals stocks (24 results).

Q3 2026 Earnings Summary

• Revenue (Q3 2026 vs. Q3 2025): US$495.2 million vs. US$482.1 million (up approximately 3%)
• Net Income, Excl. Extra Items (Q3 2026 vs. Q3 2025): US$2.3 million vs. a loss of US$5.8 million (moved from loss to profit)
• Basic EPS (Q3 2026 vs. Q3 2025): US$0.01 vs. a loss of US$0.03 per share (improved from loss to profit)
• Adjusted EBITDA Margin (Q3 2026 vs. Q3 2025): 22.4% vs. approximately 19.9% (expansion of roughly 250 basis points)

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Evaluating CTOS: Earnings Power Versus Cash Discipline

The bullish case hinges on Custom Truck One Source turning grid demand into durable earnings and self funded growth.

"The main thing that has to go right is that Custom Truck One Source successfully shifts from heavy rental fleet investment toward consistent free cash flow generation while managing higher chassis costs tied to new emissions rules."

Q3 results partially validate that ambition. Profitability moved in the right direction, with adjusted EBITDA margins higher and SER rental metrics strong. At the same time, management lifted 2026 net rental fleet investment to a range of US$210 to US$230 million, which trims expected 2026 levered free cash flow from more than US$50 million to only slightly positive. The earnings base is strengthening, but the free cash flow milestone is delayed rather than achieved.

That disagreement has a full argument behind it. → Uncover the higher Fair Value this Narrative argues for.

Custom Truck One Source: Cash Concerns Linger Beneath Margin Highs

The bear case argues that Custom Truck One Source could keep posting strong rental metrics while free cash flow and deleveraging stall.

"While management is focused on growing a relatively young rental fleet and has adjusted net rental CapEx to support mid single digit net OEC growth, the company still has to prove that this capital heavy approach can consistently translate into positive free cash flow after funding fleet needs."

Q3 results do not put that concern to rest. Adjusted EBITDA margins widened and SER utilization and yield looked healthy, yet 2026 levered free cash flow has been cut from more than US$50 million to only slightly positive as net rental fleet investment rises to US$210 to US$230 million. Net leverage improved to 3.7x, but the key milestone of self funded growth is pushed out rather than achieved in this report.

Hunt For Quiet Margin Outliers

Custom Truck One Source recently highlighted how quickly sentiment can change when margins and cash generation shift. The real opportunity lies in stocks that could be undervalued before stronger fundamentals gain wider recognition.

• Company 1 - 34% below our estimate - expands an advisory platform so capital markets and private capital transactions account for a greater share of fees.
• Company 2 - 42% below our estimate - turns a growing tracker backlog into bundled storage and inverter projects that deepen reliance on its software ecosystem.
• Company 3 - 46% below our estimate - converts data center and modular construction orders into higher margin mechanical and electrical service packages.

That is three of the list. See every one of the 29 undervalued companies on it →

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