Nemak’s first-quarter revenue rose 15%. Its EBITDA fell 15%. Both figures are real, and the gap between them is the entire story of this stock.
The USMCA joint review opens in Washington on Wednesday, July 1, the six-year checkpoint that decides whether North America’s trade pact survives in its current form. Nemak is the BMV’s purest auto-parts bet, an aluminum caster that sends engine blocks, structural castings, and e-mobility components across both borders, and the market treats it as a binary on the outcome: good headline, the stock pops off depressed levels; bad headline, it sells off again. That framing is wrong on both ends. The tariff cost is a problem Nemak has largely solved. The risk that actually decides its 2026 is volume, and the first quarter already showed which way volume is pointing.
The cost line is the solved problem
Start with what the July 1 review threatens, because the threat is smaller than the share price implies. The tariffs on the table are a 25% general rate on non-certified exports and a 50% Section 232 rate on steel and aluminum. For a company that buys aluminum and ships finished castings, that reads like a direct hit. It is not, because Nemak does not eat it.
The metal is a pass-through. Aluminum casters price their contracts on a metal-plus-conversion basis, so when the aluminum index rises, the invoice rises with it, and the cost lands on the customer, not the caster. Management has been explicit on the tariff itself: Nemak’s CEO has said the company will not absorb any tariff increase, that the surcharges are not its to carry, and that the contracts with clients reflect that. The automaker pays. We made the structural version of this argument three weeks ago in “Washington Wants Fifty Percent. It Will Settle for Less. The Math Still Breaks,” where the danger to Mexico’s auto-parts complex was never the tariff line item but what a stricter rule of origin does to where vehicles get built.
So the July 1 review matters to Nemak the way weather matters to an airline. It moves sentiment, it moves the multiple for a day, and it does very little to the cost structure the bears think it threatens. The tariff rate on Mexican and Canadian vehicles and parts is even expected to settle around 12% in 2026, well below the headline 25%. If the review were the whole risk, Nemak near MXN 3.38, at the bottom of its 52-week range, would be a straightforward value trade. The review is not the whole risk.
What actually moved the quarter
Look at how Nemak got to 15% revenue growth, because the composition is the tell. The increase came from three places: higher aluminum prices flowing through the metal-plus pricing, a positive currency effect as the euro appreciated against the dollar, and the first contribution from GF Casting Solutions, the Georg Fischer business Nemak bought in February. Notice what is absent from that list. None of the growth is volume. None of it is the core business selling more parts to more cars.
That is why EBITDA went the other way. Reported EBITDA fell to USD 128mm from USD 149mm a year earlier, and the margin compressed from 12.2% to 9.1%, a drop of more than three full points in twelve months. Aluminum pass-through inflates revenue and cost in equal measure, so it adds to the top line and nothing to the profit line. Currency translation flatters the dollar figures without adding a unit of demand. And underneath both, the thing that actually drives an aluminum caster’s economics, the number of castings rolling off the line, is soft. A plant that runs below its volume base cannot cover its fixed costs, and the margin gives way. That 15% is price, currency, and a deal. Demand is not in it. The volume base underneath is shrinking.
The one line that did improve is the one that explains the least. Net income swung to a USD 21mm profit from a USD 16.5mm loss a year earlier, and a reader skimming the headline would take that as the quarter turning a corner. It is not an operating recovery. EBITDA, the measure of what the plants actually earned, fell. The swing to profit came from below the operating line, helped by lighter extraordinary and integration charges and the same euro translation that padded the revenue. Operating earnings rose by USD 3mm; the reported bottom line moved by nearly USD 38mm. When the profit line travels in the opposite direction from the cash-generating line, the quality of the print is in the gap, and here the gap is the whole move.
The number Nemak just stopped reporting
Here is the part that should bother anyone underwriting the bull case. On its full-year 2025 call, Nemak told investors it will no longer report production volumes, on the reasoning that the legacy volume metric has become less meaningful as the product mix shifts. The company is retiring the single number that explains its margin, in the exact quarter that number turned into the swing factor for the stock.
The last figure Nemak did give was a tell in its own right: full-year 2025 volume of 38.4 million equivalent units, down 3% on 2024. Revenue for the year held flat near USD 4.9bn and EBITDA fell 7% to USD 591mm, the same pattern the first quarter would repeat, profit eroding as the top line treads water. A 3% volume decline does not sound like much. Against a fixed-asset base as heavy as a foundry’s, where the furnaces run whether the orders come or not, it is the difference between a 13% margin and an 11% one.
Now set that operating leverage against where North American production is headed. The region built 15.3 million light vehicles in 2025, already down 1% on the year. S&P Global’s tariff-adjusted scenarios put 2026 output between 14.2 and 14.6 million units, a decline of 4.5% to 7.0%, as automakers trim build schedules into higher costs and softer demand. Nemak’s content is on a wide swath of those vehicles. A 5% to 7% cut in builds, dropped onto a cost base that barely moves, is a far larger threat to 2026 EBITDA than any tariff Nemak passes straight through to its customers. The company has decided to stop showing investors the variable that will do the damage. We will have to reconstruct it from revenue and customer build rates instead.
The guidance is the acquisition
Management’s 2026 guidance looks like growth and reads like stagnation once you take it apart. Nemak guides to revenue of USD 5.3bn to 5.5bn and EBITDA of USD 630mm to 650mm, against 2025’s USD 4.9bn and USD 591mm. Revenue up roughly half a billion dollars, EBITDA up about USD 49mm at the midpoint. The trouble is where that USD 49mm comes from.
Nemak expects USD 30mm to 40mm of synergies from the GF Casting deal alone, and that is before the acquired plants contribute their own standalone earnings to the consolidated total. Add a full year of GF Casting’s base EBITDA to the synergy number and you have already exceeded the USD 49mm of guided growth. The arithmetic only closes if the business Nemak owned before the deal is guided to stand still or shrink. The company is buying its way to a flat-to-down organic year and presenting the sum as an advance. That is a defensible thing to do when you can acquire growth cheaply. It is a poor place to be standing if North American volumes break toward the low end of the production range.
The balance sheet is moving the wrong way at the same time. Net debt rose to USD 1.79bn at the end of the first quarter from USD 1.6bn a year earlier, lifting pro forma net-debt-to-EBITDA to 2.8x from 2.4x at year-end. Capital expenditure nearly doubled year-over-year to USD 113mm, with full-year capex guided near USD 390mm to fund the e-mobility and structural pipeline. Leverage is climbing, cash going out the door is climbing, and the metric that pays for both, EBITDA, is the one under pressure. Management’s stated aim is to bring leverage back toward 2.0x within about two years, a plan that assumes the volume cooperates. The production forecast says it may not.
Bull case, bear case, and the risk that matters
The bull case is not empty. Nemak trades near MXN 3.38, the consensus 12-month target sits around MXN 6.08, and all five analysts covering the stock are positive on it, better than 50% implied upside from here. The e-mobility, structure, and chassis lines reached USD 189mm in the first quarter, about 14% of sales, and that is the genuine growth engine: real diversification away from the internal-combustion castings that built the company, plus a fresh China customer win that came with the GF Casting platform. If North American builds hold near 15 million, the synergies land, and the July 1 review clears without a punitive rule of origin, the stock is cheap and the re-rating is straightforward.
The bear case is the same set of facts read through the operating leverage. Cheapness in a high-fixed-cost cyclical is rarely a free lunch; it is the market pricing the chance that the leverage cuts the other way. Our forthcoming Nemak research, the first dollar-reporting company in our coverage, treats the stock as exactly that, a high-beta cyclical whose value is dominated by volume and the cost of capital rather than by the tariff headline of the week. And the cost of capital is no friend here. We argued last week in “Trapped at 6.50%” that Banxico is stuck and the discount rate on Mexican cash flows is not falling on the schedule the market assumed. A leveraged, capital-hungry cyclical is the worst kind of asset to own into a discount rate that stays high as its own EBITDA softens.
The key risk, then, sits off to the side of what every desk is watching this week: North American light-vehicle production. We flagged the backdrop in “The Capital Showed Up. The Jobs Did Not,” where auto-parts foreign investment fell 5.2% year-over-year and Mexican factories kept shedding workers even as the nearshoring announcements piled up. Nemak sits in that gap between the headline and the line. The market is telling itself a story about Nemak and tariffs. The company’s own income statement is telling a different one, and it is about volume.
MX/CA rate
pass-through
flatter
synergies
~14.4mm est.
reported
The bottom line
Wednesday’s review will dominate the Nemak tape, and it deserves to dominate almost nothing about the thesis. The tariff cost is contractually passed through, the metal is passed through, and even the headline rate is expected to settle near 12% for Mexican content. None of that is what compresses the margin. What compresses the margin is a North American build rate heading from 15.3 million units toward the low-14-millions, landing on a fixed-asset base that cannot flex with it, in a company that has just chosen to stop reporting the volume figure that would show it happening.
So watch the right number. The Q2 print lands in late July, and it is the first clean read on organic volume since management retired the metric, which means the read has to come from revenue stripped of aluminum, currency, and the acquisition. If that residual is still shrinking as leverage climbs and the discount rate holds, the stock is cheap for a reason the July 1 headline will not explain. Nemak is not a tariff-review trade. It is a bet on how many cars North America builds in 2026, and the forecast for that number is pointing down.