Stock Markets June 15, 2026 10:31 AM

Stocks See Big Swings; Micron, Western Digital Rally as Exxon Retreats

Tech and storage names post strong gains while select energy and small-cap stocks sell off

By Maya Rios
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Major U.S. equities saw notable intraday volatility Monday, with memory and data-storage companies among the strongest performers and several energy and small-cap names showing declines. The session produced sharp percentage moves across mega-, large-, mid- and small-cap ranges, including a double-digit jump for Western Digital and steep losses for Neumora Therapeutics and Fox Corp.

Stocks See Big Swings; Micron, Western Digital Rally as Exxon Retreats
MU STX AMD SPCX ORCL
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Key Points

  • Memory and storage-related names led strong gains among mega- and large-cap groups, exemplified by Micron Tech (MU) and Western Digital (WDC).
  • Notable declines occurred in several individual stocks across market caps, including Exxon Mobil (XOM), Fox Corp (FOXA), Pattern Group Inc (PTRN), and Neumora Therapeutics (NMRA).
  • Movements spanned the market-cap spectrum from mega-caps through small-caps, indicating broad intraday volatility that affected technology, energy, mining and healthcare-related stocks.

Trading on Monday produced pronounced moves across market-cap categories, with gains concentrated among semiconductor and storage-related names and notable declines in a handful of energy and small-cap equities. Below are highlights of the largest percentage changes by market-cap tier for the session.


Mega-Cap Movers ($200 billion USD and higher)

  • Micron Tech (MU) +9.09%
  • Seagate Technology (STX) +9.41%
  • Adv Micro Device (AMD) +7.59%
  • SpaceX (SPCX) +6.19%
  • Oracle Corp (ORCL) +5.06%
  • Qualcomm Inc (QCOM) +4.2%
  • Facebook Inc (META) +4.31%
  • Lam Research Corp (LRCX) +4.88%
  • Intel Corp (INTC) +3.12%
  • Exxon Mobil (XOM) -4.27%

Large-Cap Stock Movers ($10-$200 billion USD)

  • Western Digital (WDC) +14.47%
  • Applied Opt (AAOI) +11.12%
  • Coeur dAlene Mines Corp (CDE) +10.61%
  • Entegris Inc. (ENTG) +10.04%
  • Hecla Mining Comp (HL) +9.91%
  • Circle Internet Group Inc (CRCL) +9.62%
  • Tower Semiconductor (TSEM) +8.48%
  • AngloGold Ashanti Ltd (AU) +9.04%
  • Rocket Companies Inc (RKT) +9.41%
  • Fox Corp (FOXA) -18.88%

Mid-Cap Stock Movers ($2-$10 billion USD)

  • MUU (MUU) +18.22%
  • AXT Inc (AXTI) +13.8%
  • Aura Minerals NAQ (AUGO) +13.22%
  • X Energy Inc (XE) +11.78%
  • Quantum Computing OTC (QUBT) +11.79%
  • Mudrick Capital A (HYMC) +10.83%
  • Roman DBDR Tech Acquisition (GPGI) +13.13%
  • Colonnade Acquisition (OUST) +14.47%
  • Pattern Group Inc (PTRN); Pattern Group stockholder launches 8M share offering -11.74%

Small-Cap Stock Movers ($300 million - $2 billion USD)

  • Horizon Quantum Holdings (HQ) +30.43%
  • AAOX (AAOX) +21.57%
  • Digihost Technology NAQ (DGXX) +17.39%
  • Cryptyde (ORBS) +17.27%
  • AMDL (AMDL) +15.37%
  • Idaho Strategic Resources (IDR) +12.63%
  • MULL (MULL) +18.28%
  • Neumora Therapeutics (NMRA); Neumora discontinues navacaprant after phase 3 trial failures -46.56%

The session included a mix of significant rallies and steep retreats. Technology-focused stocks, particularly those tied to memory and data storage, were among the strongest winners, while several individual companies recorded sharp declines for the day. The mid- and small-cap lists also reflected both outsized gains and deep losses, and the disclosures attached to some of those names were noted inline where provided.

Risks

  • Company-specific developments can drive abrupt share-price moves, as illustrated by the large declines in Neumora Therapeutics (NMRA) and Fox Corp (FOXA) - affecting healthcare and media sectors respectively.
  • Share offerings or similar corporate actions may weigh on stock prices, as noted with a Pattern Group stockholder launching an 8M share offering - a factor that can impact mid-cap investor sentiment.
  • Market volatility across multiple capitalization tiers can create rapid, large percentage swings for smaller-cap stocks, increasing risk for investors focused on those segments.

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