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Fiserv 's stock plummeted 44% Wednesday, closing out its worst day ever after the fintech company cut its earnings outlook and shook up some of its leadership team .

"Our current performance is not where we want it to be nor where our stakeholders expect it to be," wrote CEO Mike Lyons in a release .

For the full year, Fiserv now expects adjusted earnings of $8.50 to $8.60 a share for the year, down from a previous forecast of $10.15 and $10.30. Revenues are expected to grow 3.5% to 4%, versus a prior estimate of 10%.

During an earnings call Wednesday, Lyons said Argentina's deteriorating economic environment contributed to slowing growth and margin disappointment. Last year, the South American country c

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