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US Stock散户笔记
joined discussion · Aug 17 10:16

US Stock Market Weekly: Sector Rotation Dominates, Memory Chips Emerge as Top Highlight

Last week (Aug 10–14), the three major US indices posted mixed results, $S&P 500 Index (.SPX.US)$ The S&P 500 edged up 0.36%, $Nasdaq Composite Index (.IXIC.US)$ the Nasdaq rose 0.14%, $Dow Jones Industrial Average (.DJI.US)$ and the Dow Jones fell 0.56%. Beneath the seemingly calm surface, significant divergence occurred within sectors, presenting a typical healthy broadening rally—10 out of 11 sectors traded above their 50-day moving averages, as capital rotated from concentrated holdings into deeper market segments.
Last week (Aug 10–14), the three major US stock indices showed mixed performance, $S&P 500 Index (.SPX.US)$ the S&P 500 edged up 0.36%, $Nasdaq Composite Index (.IXIC.US)$ the Nasdaq rose 0.14%, $Dow Jones Industrial Average (.DJI.US)$ and the Dow Jones Industrial Average fell 0.56%. Beneath the seemingly flat surface, significant divergence occurred within sectors, presenting a typical healthy broadening rally—10 out of 11 sectors traded above their 50-day moving averages, with capital rotating from concentrated huddles into deeper sector opportunities. Three Leading Growth Areas The memory chip sector was the biggest winner last week.$SanDisk (SNDK.US)$ SanDisk surged 35% for the week, bringing its year-to-date gain to a staggering 591%;$Western Digital (WDC.US)$ Western Digital rose 17%, $Micron Technology (MU.US)$ Micron surged 11%. The catalyst was SK Hynix's chairman publicly warning that "the most severe memory shortage will occur next year," and revealing that capacity through 2027 has been fully booked, with HBM demand continuing to exceed expectations. The optical communication sector followed closely, with NVIDIA's Spectrum-X silicon photonics switches entering mass production, $Applied Optoelectronics (AAOI.US)$ Applied Optoelectronics rose 15% in a single day, $Lumentum (LITE.US)$ Lumentum gained 5%. The energy sector led the broader market with a weekly gain of 7.7%, driven by Middle East...
Three leading growth directions
The memory chip sector was the top performer last week.$SanDisk (SNDK.US)$ SanDisk surged 35% for the week, bringing its year-to-date gain to a staggering 591%;$Western Digital (WDC.US)$ Western Digital rose 17%, $Micron Technology (MU.US)$ and Micron climbed 11%. The catalyst was SK Hynix's chairman publicly warning of "the most severe memory shortage next year" and revealing that capacity through 2027 has already been booked, with HBM demand continuing to exceed expectations.
The optical communication sector followed closely, as NVIDIA's Spectrum-X silicon photonic switches entered mass production, $Applied Optoelectronics (AAOI.US)$ with Applied Optoelectronics jumping 15% in a single day, $Lumentum (LITE.US)$ and Lumentum rising 5%.
The energy sector led the broader market with a 7.7% weekly gain, as geopolitical tensions in the Middle East pushed oil prices higher, driving a collective rally in leaders such as Exxon Mobil and Chevron.
Key Events and Watchlist for This Week
Last week (Aug 10–14), the three major US stock indices showed mixed performance, $S&P 500 Index (.SPX.US)$ the S&P 500 edged up 0.36%, $Nasdaq Composite Index (.IXIC.US)$ the Nasdaq rose 0.14%, $Dow Jones Industrial Average (.DJI.US)$ and the Dow Jones Industrial Average fell 0.56%. Beneath the seemingly flat surface, significant divergence occurred within sectors, presenting a typical healthy broadening rally—10 out of 11 sectors traded above their 50-day moving averages, with capital rotating from concentrated huddles into deeper sector opportunities. Three Leading Growth Areas The memory chip sector was the biggest winner last week.$SanDisk (SNDK.US)$ SanDisk surged 35% for the week, bringing its year-to-date gain to a staggering 591%;$Western Digital (WDC.US)$ Western Digital rose 17%, $Micron Technology (MU.US)$ Micron surged 11%. The catalyst was SK Hynix's chairman publicly warning that "the most severe memory shortage will occur next year," and revealing that capacity through 2027 has been fully booked, with HBM demand continuing to exceed expectations. The optical communication sector followed closely, with NVIDIA's Spectrum-X silicon photonics switches entering mass production, $Applied Optoelectronics (AAOI.US)$ Applied Optoelectronics rose 15% in a single day, $Lumentum (LITE.US)$ Lumentum gained 5%. The energy sector led the broader market with a weekly gain of 7.7%, driven by Middle East...
Stock Forecasts for This Week
$SanDisk (SNDK.US)$ SanDisk rose for five consecutive days last week, gaining over 35% cumulatively. The J value of the KDJ indicator has broken above 100, indicating extreme overbought conditions. Chasing the rally is not advisable; consider waiting for a pullback to around $1,356 before reassessing.
$Reddit (RDDT.US)$Reddit's inclusion in the S&P 500 triggered forced buying,with a single-day surge of over 16%. Such forced-buying rallies typically correct quickly after index rebalancing. It is recommended to wait until passive buying pressure subsides (approximately 3-5 trading sessions),and reassess once prices stabilize.。
$Microsoft (MSFT.US)$ Microsoft's capital expenditure on AI infrastructure remains high, but the payback period is lengthening.Cost pressures in data centers are compressing near-term valuation expansion potential.The stock price faced resistance near previous highs; if it fails to break through, it may enter a consolidation phase lasting several weeks.Wait for a pullback to trendline support before reassessing.
$Alphabet-A (GOOGL.US)$ Berkshire Hathaway increased its position in Google by $17 billion. Among the Mag 7, Google has the lowest valuation and offers outstanding value.
$Micron Technology (MU.US)$ Micron, as a core play in the memory cycle, shows the healthiest technical setup. Institutional target price is $1,250, implying approximately 28% upside potential.
$Advanced Micro Devices (AMD.US)$ AMD rose more than 6% last week, with technical indicators showinga breakout pattern following consolidation.Tiger Global established a new position worth $390 million, providing clear capital support;
$Exxon Mobil (XOM.US)$ The energy sector surged 7.7% last week, making it the strongest performer in the broader market, while Exxon Mobil formed a mature bottoming structure. Its high dividend yield and robust free cash flow act as a defensive fortress, accelerating inflows of defensive capital amid heightened market volatility. Escalating geopolitical tensions in the Middle East are supporting oil prices, thereby bolstering valuations for energy stocks.
Summary
The current market is in a structural phase characterized by "stable indices but active sectors." Strategically, investors should place less emphasis on broad indices and more on individual stocks, focusing on two main themes: the memory chip cycle and AI computing infrastructure. At the same time, remain vigilant about weakening consumer demand, manage position sizes carefully, and avoid chasing overbought stocks.
 The above content is based on analysis of public data and is for reference only; it does not constitute investment advice. Market risks exist; please invest with caution.
Content Disclosure: Personal opinion
Risk Disclaimer: The above content only represents the author's view. It does not represent any position or investment advice of Futu. Futu makes no representation or warranty.Read more
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