Ternium's $368m Q3 swing: a Mexican margin story wrapped in tax noise and a Usiminas ownership shuffle

The SteelOrbis teaser is accurate as far as it goes: Ternium booked net income of $368 million in Q3 2026 against a $270 million loss a year earlier. But a $638 million year-on-year swing of that size invites the wrong conclusion if read as an operational story alone. Decomposing it is more instructive than the headline, and the decomposition says three quite different things are happening at once.

The arithmetic behind the swing

The company released results on 3 November 2026; the trade press followed two days later. The reported facts from the release:

Now the part the teaser cannot show. The Q3 2025 loss was not an operating loss. It contained a $405 million non-cash write-down of deferred tax assets at Usiminas and a $32 million litigation provision charge. Excluding those, equity-holder income in the base quarter was around $21 million. On the other side, Q3 2026 profit was struck after $116 million of deferred tax charges, principally re-measurement of USD-functional Mexican subsidiaries' deferred tax balances as the peso depreciated.

Analysis (my calculation, not company-stated): the $229 million favourable move in the tax line plus a $12 million favourable move in the litigation provision account for roughly $241 million — about 38% — of the $638 million swing. The residual ~$397 million is operating and financial: operating income +$363 million, net financial results +$41 million, equity earnings −$5 million. So the turnaround is majority-operational, but a large minority of the statistical swing is the disappearance of a one-off.

Where the operating improvement actually comes from

Mexico is the whole story. Mexican steel net sales rose 35% year on year to $2,437 million on shipments of 2,181 kt (+18%), with revenue per tonne up 15% to $1,118 — an all-time quarterly shipment high, with nine-month Mexican volumes up 13% to 6,245 kt. Management attributes the growth principally to import substitution; Mexican flat-product imports were still running above 400,000 t/month on the call.

The contrast with the other segments is stark:

Brazil remains the drag: worldsteel expects Brazilian apparent steel consumption to fall 2.7% in 2026, and although anti-dumping measures introduced early in the year cut Chinese-origin volumes, imports from Vietnam, South Korea and Egypt are growing strongly, alongside indirect steel entering through vehicles. Ternium also partially idled Mineração Usiminas on poor iron ore export economics — mining shipments fell 12% to 2.832 Mt.

One analytical caveat worth flagging: BTG Pactual noted on the call that Mexican flat HRC prices were up more than 40% year on year, while Ternium's realised prices rose only about 15%. That gap is the mix and contract-lag effect, and it implies some of the price gain is still working through into Q4 and 2027 rather than fully captured in Q3.

The ownership change nobody headlines

The least-reported element is also the most structurally interesting. Non-controlling interests absorbed $290 million of the Q3 2025 loss; in Q3 2026 they took $88 million of the profit. The driver is the 10 February 2026 purchase of 153.1 million Usiminas ordinary shares from Nippon Steel and Mitsubishi for about $315.2 million, lifting Ternium's control-group stake from 51.5% to 83.1% (the T/T group held 92.9% after closing).

The accounting effect appears in the NCI share of Usiminas, which fell from 76.7% in Q3 2025 to 62.5% in Q3 2026. In plain terms, Ternium has bought a larger share of a currently weak Brazilian asset. That boosts the parent's share of any future recovery, but it also means a bigger slice of Usiminas' losses lands on Ternium shareholders while Brazilian demand remains depressed. Selling shareholders who exited at roughly $2.06 per ordinary share clearly priced that risk; Ternium has taken the other side of that trade. Management indicated on the call that further Usiminas share purchases have no immediate path to a tender offer.

Balance sheet and cash: the quieter signal

Net cash stood at just $22 million at 30 September 2026, against net debt of $112 million at 30 June and net cash of $715 million a year earlier. Sequentially the position improved, but year on year the cushion has largely gone — the combined cost of the Usiminas stake purchase and the capital programme. Capex is being reined in: $398 million in Q3 2026 versus $711 million a year earlier, and roughly $1.2 billion for 9M26 against about $2 billion in 9M25. The Pesquería project is characterised as a 2027 ramp-up with fuller contribution in 2028.

Guidance is for Q4 EBITDA broadly in line with Q3, as December seasonality offsets higher margins per tonne.

What to watch

The exposure that matters most is policy rather than metallurgy. US steel tariffs were raised from 25% to 50%, and Ternium states it cannot predict the evolution or quantify the impact. At the July 2026 USMCA joint review the parties did not confirm an extension, though the agreement runs to 2036 unless extended; US–Mexico steel and auto tariff talks continued without definitive agreement. A Mexican demand picture resting on import substitution is, by construction, a bet on trade policy holding — and that is the single variable least within the company's control.

For metals readers, the practical takeaway is to separate three things the headline fuses: a one-off tax base effect that will not repeat, a genuine Mexican margin and volume expansion that has further contract repricing to come, and a deliberate increase in exposure to a Brazilian asset bought cheaply but still loss-making at the operating level. The first is noise, the second is the thesis, and the third is the option Ternium has chosen to buy.