Rumo (RAIL3) closed the third quarter of 2026 with a figure that is confusing at first glance: accounting net income rose 5.6%, but adjusted net income—the metric the market closely follows—fell 17.4%, from R$ 733 million in Q3 2025 to R$ 605 million. Two opposing signals in the same earnings report; understanding why is what separates those who panic-sell from those who evaluate what actually changed at the company.
RAIL3: What Is Rumo?
The stock RAIL3 represents Rumo S.A., Brazil's largest independent private railway operator. The company controls more than 15,000 km of railway network and divides its operations into two segments: the North Operation, which transports grain and sugar from the Midwest to the Port of Santos—the country's largest soybean export corridor—and the South Operation, which covers Rio Grande do Sul, Santa Catarina, and Paraná with varied cargo transport. It is an infrastructure company with revenue tied primarily to the volume of agricultural commodities hauled for export.
Rumo's controlling shareholder is Cosan (CSAN3), which holds approximately 20% of the company. This link drew attention this week due to conversations confirmed by Cosan regarding the sale of part of its stake in Rumo, which could alter the company's governance depending on the buyer.
What the Market Expected vs. What Was Delivered
The R$ 34 million miss relative to consensus seems small in absolute terms, but the point that bothered the market is the 17.4% decline compared to Q3 2025. To understand whether this pullback is real or an illusion of the comparison base, one must look at the operational numbers first.
What the Q3 2026 Numbers Show
Net revenue grew 3.5%, from R$ 3.82 billion in Q3 2025 to R$ 3.95 billion. Transported volumes reached 23.9 billion revenue ton-kilometers (RTK), a 2% year-over-year increase and approximately 6% above analysts' projections—a solid operational result even with September weighing against it: during the month, Rumo transported 7.0 billion RTK, a 10% drop from September 2025, pressured by heavy rains that delayed off-season shipments at the Port of Santos.
Adjusted EBITDA totaled R$ 2.22 billion, a 4.2% decline from the same period of the previous year, with the margin slipping from 60.6% to 56.1%. Between the two operations, the contrast is striking:
The North Operation, which accounts for the bulk of revenue and EBITDA, remained practically stable. The deterioration stems from the South, where a less favorable cargo mix and higher costs reduced EBITDA by nearly a third compared to Q3 2025.
+3.5% over Q3 2025
Margin slipped from 60.6% to 56.1%
Was 1.9x in Q3 2025
Why Did Adjusted Net Income Fall If Revenue Grew?
Two separate reasons that reinforce each other.
The first is operational: the cost of services rendered advanced 8.1%—more than double the 3.5% increase in revenue. General and administrative expenses jumped 24.6%. Result: even with an additional R$ 136 million in gross revenue compared to Q3 2025, the margin gave up 4.5 percentage points. The company attributes part of the expense increase to investments in technology, consulting, and management that have not yet generated visible earnings gains—and announced containment measures: the sale of two corporate aircraft and the rationalization of travel, IT, and facility expenses. According to Rumo itself, the benefits "should be captured progressively" in the coming quarters.
The second reason is accounting-related and explains most of the 17.4% drop. Adjusted net income excludes non-recurring items, adding back non-cash expenses such as impairments to accounting net income. In Q3 2026, the main adjustment was a R$ 166 million impairment in the South Network (a reduction in the book value of assets, with no cash outflow), which raises accounting net income from R$ 439 million to an adjusted R$ 605 million. The problem is that, in Q3 2025, adjustments totaled R$ 317 million—nearly double. This inflated 2025 adjusted net income to R$ 733 million. The drop from R$ 733 million to R$ 605 million is not purely operational: half of it is the consequence of a smaller adjustment this year compared to last year's. Anyone viewing R$ 605 million as a collapse is confusing the base with the result.
Net debt grew to R$ 17.8 billion, a 19.5% increase over Q3 2025. Leverage (debt-to-EBITDA ratio) moved from 1.9x in Q3 2025 to 2.2x now—an upward trajectory that needs to be monitored, even though the current level remains within a manageable range for infrastructure companies with long-term contracts.
October Changed the Tone for Q4 2026
The most encouraging piece of data in the earnings release was not from the quarter ended in September: it was October. Rumo transported 8.7 billion RTK during the month, up 7% over October 2025 and a record for the period. JPMorgan, which projected 5% volume growth for the fourth quarter, signaled "upside risk" to its estimates following this figure. The bank already maintained an overweight rating on RAIL3 stock, with a price target of R$ 23.50—well above yesterday's R$ 15.54. The average freight price also advanced 1% year-over-year, which, combined with October's volume, supports expectations for a margin recovery in Q4 2026.
Rumo stated that it intends to recover by December the volumes contracted but not transported in September due to the rains. If confirmed, fourth-quarter volume could surprise to the upside, which would alleviate pressure on margins and leverage prior to year-end.
The controlling shareholder's context also matters. Cosan ended exclusive talks in October for the sale of its stake in Rumo without an agreement, but negotiations resurfaced in November. Any transaction involving this structure alters the governance profile and could impact the control premium embedded in the stock.
The Q3 2026 earnings report came in below consensus, but the 17.4% drop in adjusted net income exaggerates the actual deterioration: half of it comes from a more generous comparison base in Q3 2025, rather than an equivalent worsening in operations. The key signals to watch now are October volumes—which exceeded projections—and the announced cost cuts, the effects of which will appear starting in Q4 2026. The stock has already fallen nearly 18% in November and trades near its 12-month low. The market is reacting well to the result today, but the recovery thesis depends on the fourth quarter confirming October's pace.
Q4 2026 Results (February 2027): The quarter that will confirm or disprove the recovery. Monitor whether the EBITDA margin returns above 60% and whether expense-cutting initiatives generate visible gains. EBITDA below R$ 2.2 billion without the impairment as justification would be a real red flag.
Leverage: The debt-to-EBITDA ratio went from 1.9x in 2025 to 2.1x in Q2 2026 and 2.2x now. An upward trend. If it reaches 2.5x or higher, the room to maneuver for dividends and investments shrinks significantly.
Outcome of Cosan's Stake: The potential sale of CSAN3's participation in Rumo remains open. A new strategic buyer alters governance; if it comes with a premium, it could serve as a bullish catalyst for RAIL3.
