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Stock Markets June 22, 2026 02:01 PM

Market movers: SpaceX, Arm slide while chip, biotech and AI names climb

Mega-caps show mixed performance as select large-, mid- and small-cap stocks post sharp gains or steep declines

By Priya Menon
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Stocks moved unevenly on Monday, with several headline names in the mega-cap cohort falling and a number of technology, semiconductor and biotech companies rallying across market-cap tiers. SpaceX and Arm were notable decliners among the largest names, while AbbVie and SanDisk led gains at the top end. Momentum-driven moves were visible in large-cap AI and data-center plays, and a handful of mid- and small-cap biotech and specialty technology stocks recorded double-digit jumps.

Market movers: SpaceX, Arm slide while chip, biotech and AI names climb
SPCX ARM GOOGL NFLX PLTR
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Key Points

  • Mega-cap names displayed mixed performance: SpaceX and Arm were among the largest decliners while AbbVie and SanDisk posted gains.
  • Technology and AI infrastructure plays led several large-cap rallies, including Supermicro's data center blueprint and Micron's partnership with Anthropic.
  • Biotech and small-cap names showed pronounced moves tied to trial timelines, regulatory alignment and acquisition activity, affecting companies such as Mind Medicine, Apogee Therapeutics and Regenxbio.

Trading on Monday produced a wide dispersion of returns across market-cap categories, as traders reacted to fresh coverage, corporate announcements and partnership news. Here are the most pronounced moves organized by market-cap group.

Mega-cap movers (Market cap: $200 billion or higher)

  • SpaceX (SPCX) - KeyBanc initiated coverage with a Sector Weight rating; shares fell 10.11%.
  • Arm (ARM) - down 6.97%.
  • Google Inc (GOOGL) - down 5.69%.
  • Netflix, Inc. (NFLX) - down 5.61%.
  • Palantir Technologies Inc (PLTR) - down 6.0%.
  • AbbVie Inc (ABBV) - shares rose 6.82% after AbbVie agreed to acquire Apogee Therapeutics for $10.9 billion.
  • SanDisk Corp-Exch (SNDK) - up 6.34%.
  • Micron Tech (MU) - up 5.68% following a partnership with Anthropic on AI infrastructure and a supply agreement.
  • Intel Corp (INTC) - up 4.9%.
  • Oracle Corp (ORCL) - down 4.55% after Baystate Health expanded its partnership with Oracle for a digital overhaul.

Large-cap stock movers (Market cap: $10-$200 billion)

  • Super Micro Compu (SMCI) - rose 19.08% as Supermicro launched a data center blueprint for HPC and AI systems.
  • Innio Holding Gmbh (INIO) - up 12.2%.
  • Jds Uniphase Corp (VIAV) - up 10.3%.
  • Credo Technology Holding (CRDO) - up 10.29% after Evercore ISI initiated coverage with an outperform rating.
  • Semtech Corp (SMTC) - up 9.75%.
  • Vicor Corp (VICR) - up 9.24%.
  • Coherent (COHR) - up 10.46%.
  • Roblox Corp (RBLX) - down 9.45%.
  • New Providence Acquisition Corp N (ASTS) - down 8.35%.
  • Vector Acquisition (RKLB) - down 7.04%.

Mid-cap stock movers (Market cap: $2-$10 billion)

  • Mind Medicine Inc OTC (DFTX) - up 52.37%. The company Definium is set to present phase 3 depression trial results Monday.
  • Apogee Therapeutics (APGE) - up 46.72% (note: AbbVie is acquiring Apogee for $10.9 billion, as noted above).
  • ARCA biopharma (ORKA) - up 22.1%.
  • Aeglea Bio Therapeutics Inc (SYRE) - up 13.2%.
  • SNXX (SNXX) - up 12.61%.
  • MUU (MUU) - up 11.65%.
  • Biohaven Pharmaceutical Holding Co (BHVN) - up 13.41%.
  • Spartacus Acquisition (NN) - down 8.72%.
  • AeroVironment (AVAV) - down 10.25%.
  • Longview Acquisition (BFLY) - down 21.85%.

Small-cap stock movers (Market cap: $300 million - $2 billion)

  • Horizon Quantum Holdings (HQ) - up 21.23%.
  • Shutterstock (SSTK) - up 20.99%.
  • Regenxbio Inc (RGNX) - up 19.1% following alignment with the FDA on a gene therapy resubmission path.
  • Galecto Inc (DMRA) - up 20.42%.
  • Brp Group Inc (BWIN) - up 21.29% after JPMorgan upgraded Baldwin Insurance stock rating on a strategic review.
  • ASTX NYSE (ASTX) - up 1.81%.
  • Julong Holding Ltd (JLHL) - down 42.23%.
  • Horizon Space Acquisition II (SLBT) - down 18.09%.
  • RKLX (RKLX) - down 14.41%.
  • Velo3D (VELO) - down 15.54%.

Movers on Monday spanned a range of drivers identified in company or analyst actions: initiation of coverage and rating changes, corporate deals and acquisitions, partnership announcements, product or solution launches, regulatory alignment and clinical trial milestones. The breadth of activity touched sectors including aerospace and space-related firms, semiconductors and AI infrastructure, cloud and enterprise software, and biopharma and gene therapy developers.

Market participants seeking live updates and further market-moving items can refer to real-time services for continuous coverage of developing stories.

Risks

  • Analyst coverage changes and initiations can prompt sharp share-price reactions, as seen with SpaceX and Credo Technology - impacting investor sentiment in aerospace and semiconductor-related stocks.
  • Deal announcements and M&A activity introduce integration and execution uncertainty; AbbVie's acquisition of Apogee Therapeutics is a material corporate event for the biopharma sector.
  • Clinical trial readouts and regulatory interactions create event-driven volatility for mid- and small-cap biotech names, exemplified by Definium's phase 3 presentation and Regenxbio's FDA resubmission alignment.

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