Multiple Single-Stock Catalysts Drive Sharp Moves Across Equities on September 30

A broad set of individual company catalysts drove outsized stock moves on Wednesday, September 30, 2026, with deals, clinical data, earnings, and sector news all contributing to sharp gains and losses across small- and large-cap names.

Nu Holdings was among the most notable movers in after-hours trading after reports surfaced that the Brazilian neobank is exploring an acquisition or minority stake in UK-based digital bank Monzo, a move that would mark a significant step in Nu's international expansion beyond Latin America. Separately, SoFi Technologies was active during the session, with the company having recently raised its 2026 revenue guidance to a range of $4.75 billion to $4.85 billion. Surf Air Mobility also drew attention Wednesday, though the specific catalyst was not detailed in available sources.

On the biotech side, Sagimet Biosciences and Connect Biopharma both surged, with Connect developing rademikibart, a monoclonal antibody targeting IL-4Ra for asthma and COPD indications. United Therapeutics also rallied sharply during the session. Rafael Holdings fell steeply, with its shares under pressure on news not fully detailed in available wire copy.

In banking, Capital Bancorp gained while Peoples Bancorp slid roughly 5.8% in pre-market activity, with the decline attributed to sector-specific pressure. In large-cap options, Meta Platforms saw unusually heavy contract volume of more than 719,000 contracts, while Penske Automotive Group, MongoDB, and Nvidia also saw notable options activity. Concentrix edged higher despite reporting fiscal third-quarter revenue that missed analyst estimates.