Stock Markets August 18, 2026 02:07 PM

SanDisk, Marvell Among Heaviest Decliners as Market Movers Span Caps

Mega- and large-cap technology names lead losses while selected small-caps post gains

By Hana Yamamoto
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SNDK MRVL INTC FN

Trading on Tuesday delivered pronounced moves across market-cap segments. Mega-cap technology-related names including SanDisk and Marvell were among the steepest decliners. Several large- and mid-cap stocks also fell sharply, while a handful of small-cap names posted notable gains on company-specific results.

SanDisk, Marvell Among Heaviest Decliners as Market Movers Span Caps
SNDK MRVL INTC FN
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Key Points

  • Mega-cap technology and semiconductor-related stocks led the declines, with SanDisk down 9.82% and Marvell down 9.31%, while Intel fell 7.5%.
  • Several large- and mid-cap names posted steep losses; Fabrinet fell 21.37% despite topping Q4 estimates, and 21Vianet shares dropped 17.17% after a Q2 earnings miss and weak guidance.
  • Small-cap action was mixed: Flexsteel Industries surged 20.19% on stronger-than-expected Q4 results and guidance, and IMC Rare Earths rose 11.06% while multiple small caps declined sharply.

Tuesday's session produced clear winners and losers across the market-cap spectrum. Mega-cap technology-linked names were among the biggest detractors from performance, and several large- and mid-cap issues registered double-digit percentage declines. At the same time, a subset of small-cap stocks recorded meaningful gains tied to quarterly results.


Mega-Cap Movers (Market cap: $200 billion USD or higher)

  • SanDisk Corp-Exch (SNDK) -9.82%
  • Marvell Technology Group Ltd (MRVL) -9.31%
  • Intel Corp (INTC) -7.5%

Large-Cap Movers (Market cap: $10-$200 billion USD)

  • Fabrinet (FN) - Fabrinet topped Q4 estimates but shares fell over 5% -21.37%
  • Cerebras Systems Inc (CBRS) -14.32%
  • Semtech Corp (SMTC) -13.24%
  • FormFactor (FORM) -12.59%

Mid-Cap Movers (Market cap: $2-$10 billion USD)

  • 21Vianet Group (VNET) - VNET shares fell 6% on a Q2 earnings miss and weak guidance -17.17%
  • Aehr Test Systems (AEHR) -16.47%
  • MaxLinear Inc (MXL) -14.9%

Small-Cap Movers (Market cap: $300 million - $2 billion USD)

  • Flexsteel Industries (FLXS) - Flexsteel shares surged on better-than-expected Q4 results and guidance +20.19%
  • MVLL (MVLL) -18.43%
  • MULL (MULL) -15.99%
  • INTW (INTW) -14.74%
  • IMC Rare Earths (IMC) +11.06%

Below are several observations drawn directly from the session's headline movers. The list above preserves reported intraday moves and company commentary included in market notices for the day.

Observations

  • Losses were concentrated among large technology and semiconductor-linked names in the mega- and large-cap buckets, with multiple stocks posting double-digit declines.
  • Certain companies that reported results or guidance experienced outsized reactions: Fabrinet reported Q4 results that beat estimates yet its shares moved lower, and 21Vianet reported a Q2 earnings miss with weak guidance that coincided with a notable share drop.
  • Small-cap names showed divergent performance: while several small caps fell in double digits, Flexsteel and IMC Rare Earths registered two of the largest percentage gains among listed movers tied to quarterly results and guidance for Flexsteel.

Context and coverage scope

This roundup highlights headline percentage moves across market-cap classifications for the trading day. It lists the intraday percentage changes reported for each named security and, where provided in market notices, the company-specific reason tied to that movement (for example, earnings beats, earnings misses, or guidance updates).


Note: The above reflects the session's reported price moves and the company-level notes provided with those moves. No additional context or attribution beyond the reported figures and company result summaries is included.

Risks

  • Company earnings and guidance releases produced sharp share price reactions today, indicating continued volatility tied to reported results; this impacts corporate issuers across technology, manufacturing, and mining sectors.
  • Concentrated, double-digit declines among several large-cap and mid-cap technology-related names create uncertainty for sector and index performance in the near term.
  • Divergent moves within the small-cap cohort suggest idiosyncratic risk remains high for smaller issuers, where quarterly results and forward guidance can drive outsized percentage changes.

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