Why StoneCoStock Soared Today

STNE surged 24.8% on October 5, 2026, after Flávio Bolsonaro, the conservative candidate, outpolled incumbent President Lula da Silva 47.3% to 44.8% in the first round of Brazil's presidential election.

The 2.5-point gap sets up an October 25 runoff, and investors are betting a Bolsonaro victory would benefit the Brazilian economy and StoneCo, which the source describes as a Brazilian e-commerce software company. The move is a direct repricing of election odds: the stock jumped the session after the first-round result, not on any company-specific announcement in the supplied evidence.

Valuation frames the rally. STNE trades at 3.6x trailing earnings, with forecasted earnings growth of 16% annually. Interpretation: a multiple that low suggests the market was already discounting political risk heavily, so a single poll-driven session can produce an outsized gain. It also means the stock's trajectory is tied closely to runoff sentiment, since the cited catalyst is political rather than operational.

Note the margin. A 47.3% to 44.8% first-round result is not decisive, and the October 25 runoff remains the event that determines whether the rally holds.