The "September Effect" Is in Full Swing, With Stocks Slumping Left and Right. Here's How History Says Investors Should Respond.

September historically shows negative average returns for major stock indices, but the effect occurs only slightly more than half the time. Rather than attempting to time the market by selling before September, investors should stay invested long-term, as October and November typically deliver strong gains that offset September losses.

09/20/2026, 7:15 AM • The Motley Fool

Should You Buy Micron Stock Before Its Next Earnings Report?

Micron Technology is positioned to report strong fiscal Q4 earnings on Sept. 30, with Wall Street expecting 350% revenue growth and 11x EPS growth driven by AI infrastructure demand. Major tech companies like Amazon, Tesla, Nvidia, and SpaceX have publicly confirmed robust memory demand and increased capital spending. However, the article advises against timing purchases around earnings events, recommending instead a long-term dollar-cost averaging approach to build positions in memory makers benefiting from AI tailwinds.

09/20/2026, 5:30 AM • The Motley Fool

The Stock Market Has Been Sending a Quiet Warning Signal for Years. Here's What History Says Comes Next.

The S&P 500's top 10 holdings now account for approximately 40% of the index's value, the most concentrated since the mid-1960s. With nearly all top holdings being tech companies focused on AI, a significant pullback in this sector could drag down the broader market. History shows similar concentration preceded the dot-com bubble, suggesting investors should diversify portfolios and focus on quality companies with strong fundamentals.

09/20/2026, 3:30 AM • The Motley Fool

Semiconductor Stocks to Buy and Hold Through 2030

The article analyzes four semiconductor companies for long-term holding through 2030 amid AI infrastructure buildout. Nvidia and Broadcom are recommended as anchors due to durable profit positions, Marvell is a buy but should be kept smallest, and Micron is rated a hold. The author cautions that AI spending will eventually cool, making valuation and supply chain positioning critical factors for four-year returns.

09/19/2026, 5:17 AM • The Motley Fool

Micron Turned $10,000 Into About $130,000 in 5 Years. Most of It Came in the Past 12 Months.

A $10,000 investment in Micron Technology in September 2021 grew to approximately $130,000 in five years, with nearly all gains occurring in the past 12 months driven by AI-driven demand for memory chips. However, the stock's current valuation and cyclical nature of memory prices raise concerns about sustainability, as the company previously suffered a $5.83 billion loss during a memory price downturn three years ago.

09/18/2026, 5:31 PM • The Motley Fool

This Nation's Stock Market Is Outperforming All Others This Year. Should You Invest?

South Korea's stock market is outperforming all others in 2026, with the Kospi index up nearly 60% driven primarily by semiconductor giants Samsung and SK Hynix. The market trades at attractive valuations (12x earnings vs S&P 500's 26x) and Goldman Sachs projects a 34% upside to 9,000. Investors can gain exposure through the iShares MSCI South Korea ETF (EWY), though the author recommends only modest investments due to tech sector volatility.

09/18/2026, 11:23 AM • The Motley Fool

Micron Is Poised to Surge After Its Fiscal Year Ends

Micron Technology is expected to deliver strong fiscal 2026 results on September 30, with revenue estimated to increase 3.5x to $129.7 billion and EPS rising 9x to $73.44. The company benefits from severe memory chip supply shortages driven by AI data center demand, with memory prices expected to continue rising into 2027. Analysts project 315% revenue growth for Q1 fiscal 2027, and Micron's attractive PEG ratio of 0.14 suggests the stock remains undervalued despite its 488% gain over the past year.

09/18/2026, 9:32 AM • The Motley Fool

3 Stocks to Buy as an Analyst Sees Semiconductor Spending Surging 88%

Bank of America analyst predicts the semiconductor market will grow 88% to $3.2 trillion by 2030, with memory becoming the largest segment. The analyst recommends SK Hynix, Nvidia, and ASML as top stocks to benefit from surging chip demand driven by AI investments, with strong order flows and pricing remaining robust.

09/18/2026, 5:30 AM • The Motley Fool

As the Stock Market Flashes a Warning Seen Only 2 Times in 155 Years, Warren Buffett has a Big Warning for Investors

The S&P 500 has surged 26%, 25%, and 18% over the last three years, driven largely by generative AI hype. However, the market's CAPE ratio now stands at 41—a level seen only twice in 155 years (before the dot-com bubble in 1999 and the Great Depression in 1929). Warren Buffett warns that the market is driven by 'gambling' rather than fundamentals, and recommends focusing on valuations and business sustainability rather than chasing speculative trends.

09/17/2026, 3:30 PM • The Motley Fool

1 AI Stock Poised to Outperform Micron and Sandisk on the Next Infrastructure Surge

Taiwan Semiconductor Manufacturing (TSMC) is positioned to outperform memory chip makers Micron and Sandisk as AI infrastructure spending accelerates. With AI accelerator revenue expected to grow at 60%+ CAGR through 2029 and the company controlling 72.5% of the foundry market, TSMC trades at a discount valuation of 20x forward earnings. Analysts project the stock could reach $850 by 2028, more than doubling from current levels.

09/17/2026, 7:08 AM • The Motley Fool

AI Stocks Crashing After Warning Signs Emerge: What Does It Mean for Nvidia, Micron, and SpaceX?

AI stocks are experiencing a sell-off as leaders in AI companies issue warnings about the technology's potential negative impacts. The article examines implications for major players like Nvidia, Micron, and SpaceX, noting that historically such sell-offs have presented buying opportunities for investors.

09/16/2026, 10:31 PM • The Motley Fool

September Effect: 2 Memory Stocks to Buy on a Potential Market Dip

With September historically being the worst month for stocks and midterm election years amplifying market pullbacks, the article recommends two memory stocks—Micron Technology and Sandisk—as potential buying opportunities on a dip. Both companies are benefiting from AI infrastructure demand for memory chips and are trading at low valuations despite strong growth prospects.

09/16/2026, 1:22 PM • The Motley Fool

Prediction: $1,000 Invested in Oracle Stock Could Be Worth This Much by 2030

Oracle is positioned to benefit from the generative AI boom through its cloud infrastructure and data center services, particularly via a $300 billion deal with OpenAI. However, the stock has underperformed peers like Nvidia and Micron. The company faces risks from massive capital expenditures ($90-95 billion expected in fiscal 2027), heavy concentration on OpenAI as a client, and uncertainty about long-term profitability. Analysts predict Oracle stock will deliver around 10% annual returns, turning a $1,000 investment into approximately $1,464 by 2030.

09/16/2026, 8:15 AM • The Motley Fool

The Big Short’s Michael Burry Predicts a Possible 1987-Style Drop and is Betting Against AI Giants Nvidia and Palantir. Should You Follow?

Michael Burry, famous for predicting the 2008 housing crisis, has placed significant short bets against AI stocks including Nvidia and Palantir, predicting a potential 1987-style market crash. While Burry warns of near-term headwinds and questions the sustainability of AI valuations, the article suggests long-term investors may still find opportunities in quality AI stocks despite current market concerns.

09/16/2026, 5:10 AM • The Motley Fool

Stock Market Midday, Sept. 15: Stocks Slide on AI and Bond Jitters

Major stock indexes declined on September 15, 2026, as concerns over AI scaling pressures and rising bond yields weighed on markets. The S&P 500 fell 0.45%, the Nasdaq dropped 0.73%, and the Dow declined 0.88%. The 10-year Treasury yield reached 4.99%, its highest level since 2007. While some semiconductor stocks like Nvidia, Intel, and Micron gained slightly as investors reassessed AI concerns, cryptocurrency stocks fell ahead of Senate legislation votes. High treasury yields and rising oil prices compounded market weakness.

09/15/2026, 12:34 PM • The Motley Fool