Fiserv Inc. (FI) shares plunged 43.58% in pre-market trading on Wednesday after the financial technology company reported disappointing third-quarter results and dramatically lowered its full-year outlook. The stock is on track for its worst single-day performance on record, reflecting investors' deep concerns about the company's growth trajectory and management execution.

For Q3, Fiserv posted adjusted earnings per share of $2.04, well below analysts' expectations of $2.66. Revenue of $5.26 billion also missed estimates of $5.37 billion. More alarmingly, the company slashed its full-year 2025 organic revenue growth forecast to just 3.5-4%, down from its previous projection of 10%. Adjusted EPS guidance was cut to $8.50-$8.60, compared to the prior range of $10.15-$10.30.

In response to the weak results, Fiserv announced significant leadership changes, including the appointment of a new CFO and two co-presidents. CEO Mike Lyons, who took the helm in May, acknowledged that the company's performance is "not where we want it to be" and unveiled a new "One Fiserv" action plan aimed at enhancing client focus and driving sustainable growth. However, analysts expressed skepticism, with one calling the magnitude of the guidance cut "difficult to comprehend" and suggesting management may have "took its eye off the ball" earlier in the year.