The Fiserv Inc. headquarters in Milwaukee, Wisconsin, US, on Wednesday, Oct. 29, 2025. The Fiserv Inc. stock suffered a record plunge after the fintech slashed its outlook for full-year earnings and unveiled third-quarter results that confounded Wall Street analysts

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Fiserv’s share price collapsed by nearly 50% this week, the company’s worst trading day on record. The company reported third‑quarter earnings of $2.04 per share on $4.9 billion in revenue, both metrics falling short of analysts’ expectations.

The company slashed its full‑year outlook for revenue growth from ~10% to 3.5% to 4%, and dropped its adjusted EPS guidance to $8.50 to $8.60 from $10.15 to…