S&P 500 Top 10 Movers recap for week of May 8th, 2026.
A cybersecurity surge and an earnings gap drove some of the largest single-week moves of the year, while a wave of litigation, export policy disappointment, and an analyst downgrade hit the losers hard.
Top 5 Gainers
@Cisco led at 22% after reporting record fiscal Q3 revenue of $15.84B and disclosing AI-related orders surging from $5B to $9B year-to-date, with shares gapping up more than 20% on May 14 following the earnings release.
@PaloAltoNtwks gained 17% on a combination of AI cybersecurity tailwinds tied to the Anthropic Mythos threat narrative, the launch of its new Idira identity security platform, and Oppenheimer raising its price target to $275.
@ZebraTechnology rose 15% after Q1 adjusted EPS of $4.75 beat the $4.33 consensus estimate, with management raising full-year guidance.
@CoherentCorp added 14% after Bank of America raised its price target to $400, citing 20-30% market share in 800G and 1.6T optical transceivers and upcoming laser shipments for Nvidia's co-packaged optics program.
@CrowdStrike gained 13%, hitting a new all-time high after BTIG raised its price target to $621 following positive channel checks, as AI-driven enterprise cybersecurity consolidation continued to accelerate.
Top 5 Losers
@CRiverLabs fell 15% despite beating Q1 estimates, after management cut its full-year FY2026 guidance, triggering a selloff even as several analysts raised price targets following the report.
@Carvana dropped 14% as investors locked in gains following a 5-for-1 stock split effective May 8, which came after a roughly 400% surge in the prior session.
@intel fell 13% after the Trump-Xi summit ended without chip trade agreements or progress on export restrictions, compounded by a bond-market rout reigniting rate-hike fears that hit semiconductor stocks broadly.
@Supermicro Computer declined 12% as Hagens Berman filed a securities class action alleging that executives concealed an illegal scheme to divert approximately $2.5 billion in Nvidia-powered AI servers to China through a Southeast Asian shell entity.
@ConstellationEG dropped 12% after Argus analyst John Eade cut his price target 18%, from $425 to $350, arguing the stock should trade on utility industry multiples rather than semiconductor-sector comparables.
All data was pulled using Massive's aggregates API.