Brazilian stocks surge on Bolsonaro-backed candidate's first-round upset

The first-round result of Brazil's elections produced one of the most striking market reactions in years: EWZ, the main US-listed Brazil ETF that tracks the MSCI Brazil index, surged more than 10% in after-hours trading in New York on Sunday night before opening up roughly 2% on Monday — a move that encapsulates the genuine surprise with which financial markets greeted Flávio Bolsonaro's (PL) lead over President Luiz Inácio Lula da Silva (PT) in the first round of the presidential elections.

Flávio secured approximately 47% of valid votes against Lula's 45%, overturning the projections of virtually every major poll released in the campaign's final stretch. Datafolha, Quaest and AtlasIntel all had Lula in the lead; the AtlasIntel/Bloomberg poll went so far as to credit the incumbent with 47% of valid votes against 44.1% for the senator. The systematic polling error amplified the shock for markets, which had not priced in this scenario — and the reaction was immediate and intense. Analysts polled by Folha de S.Paulo and Valor Econômico anticipated a session with strong risk appetite, a weaker dollar, lower rates in interest-rate futures and a sustained equity rally throughout the week. Prediction markets were also affected: platforms such as Kalshi and Polymarket, which are barred from operating in Brazil, acknowledged that the local blockade distorted their forecasts — an irony that underscores the informational opacity surrounding the race.

The electoral outcome cannot be read in isolation from the fiscal landscape awaiting the winner of the runoff. Economists surveyed by Folha calculate that stabilizing public debt will require a minimum adjustment of R$250 billion over the next four years — a challenge comparable in magnitude to the largest fiscal consolidation programs in the country's recent history. Valor Econômico notes that the new administration will have until 2028 to prevent general government gross debt from exceeding the 87.6% of GDP peak reached at the height of the pandemic, a level it is already approaching dangerously fast. Against this backdrop, both Flávio and Lula verbally converge on the need for fiscal adjustment, but both avoid spelling out concrete measures — an ambiguity that the business community, according to Valor, views with concern even as a rightward turn becomes the baseline scenario.

The reception of the result among business elites is nuanced. Executives interviewed by Valor see in Flávio's advance a favorable outlook for fiscal adjustment and the reform agenda, but flag uncertainty regarding the PL candidate's concrete proposals — including on the economic front — and unease over foreign trade relations and institutional stability under a potential government. Financial markets, meanwhile, anticipate that the central bank may find room to cut the Selic after the elections, depending on the runoff outcome and the winner's fiscal signaling, though bets remain cautious.

Beyond the electoral noise, the week lays bare structural tensions that no ballot-box result will quickly resolve. Auto financing hit its highest volume in 15 years in Brazil — a record that coexists with rising delinquencies, painting a picture of credit expansion driven not by income slack, but by compressed consumption alternatives. The FGV-Ibre financial vulnerability index worsened in 22 of 27 states in the second quarter of 2026, driven primarily by delinquencies, which account for 77% of the average increase. As economist Flávio Ataliba sums up: "The problem for households today is not so much taking on new debt, but managing to pay the debt they already have."

In the private credit market, infrastructure debentures — tax-incentivized notes with an outstanding stock of R$2.3 trillion — are showing the widest spreads since 2024, with the premium over equivalent NTN-Bs reaching 0.74 percentage points for the most liquid issues, above the historical average of 0.57 points. Infrastructure issuance fell to its lowest level since January 2019, pressured by defaults at companies such as Raízen and GPA over the course of the year, by the expansion of the fee-based advisory model, and by the high cost of credit. The next government will likely face mounting pressure to overhaul the exemption regime for these instruments — the foregone tax revenue is estimated at roughly R$50 billion per year — and the market is already working with the hypothesis of some form of taxation regardless of who wins the runoff.

In the energy sector, oil at US$100 a barrel — equivalent to R$522 at current exchange rates — remains a relevant backdrop, with direct implications for Petrobras and for the balance of payments. The state-controlled company announced the start of a scheduled maintenance shutdown at the Presidente Getúlio Vargas Refinery in Paraná, with a projected investment of R$800 million, while the ANP approved the delimitation of 501 new blocks for exploration on Brazil's equatorial margin — a decision still awaiting sign-off from other government bodies before being offered to the market. In the auto segment, Chinese brands are consolidating their dominance of plug-in hybrid SUVs, with newcomer Jetour leading on energy efficiency in the Folha Mauá 2026 Ranking, a trend that echoes the simultaneous advance of Chinese appliance makers with local production in Brazil, as reported by Valor Econômico.

In the coming days, attention will turn to the formal opening of the runoff campaign, to the central bank's agenda — the Focus report is due Monday — and to any fiscal signals from the candidates that could either anchor or erode market expectations. The reaction of the currency and the yield curve over the course of the week will be the most precise gauge of how much the electoral result has actually shifted investors' risk calculus.

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