Ambarella's stock plummeted 14.98% in pre-market trading on Friday, as the chipmaker faced mixed reactions from Wall Street analysts.

The sharp decline appears to be driven primarily by a rating downgrade from Summit Insights Group, which cut its rating on Ambarella to Hold. This negative action seemingly overshadowed several positive analyst notes issued around the same time, including price target increases from BofA Global Research to $96 from $72, Stifel to $106 from $90, and Susquehanna to $110 from $80.

Market participants reacted to the downgrade by selling shares in pre-market trading, indicating concerns that may have been triggered by the more cautious stance from Summit Insights Group despite other firms maintaining bullish outlooks on the company.