AI Stocks Are Creating a Sneaky Risk for S&P 500 Investors, and History Is Flashing a Warning Signal

The S&P 500's top 10 stocks now account for 39% of the index's value, with nearly all heavily focused on AI development. This concentration mirrors the dot-com bubble of 2000, raising concerns about market vulnerability. While AI companies have spent over $300 billion on data centers, Goldman Sachs warns they need $1 trillion in annual AI revenue for healthy profits. Despite historical parallels and elevated valuations, long-term investors are advised to stay invested as the market has recovered from past downturns.

09/30/2026, 8:30 AM • The Motley Fool

Meet the Low-Cost Vanguard ETF With 51.8% Invested in Nvidia, Apple, Alphabet, Microsoft, and Amazon While VOO Has Just 30%

The Vanguard Morningstar Mega Cap Growth ETF (MGK) offers concentrated exposure to mega-cap growth stocks, with 51.8% invested in Nvidia, Apple, Alphabet, Microsoft, and Amazon compared to 30% for the S&P 500 ETF (VOO). While MGK has a slightly higher expense ratio (0.05% vs 0.03%), it provides amplified exposure to AI-driven growth opportunities. However, this concentration carries risks if mega-cap growth stocks underperform, though the article argues these companies are well-positioned to capitalize on AI investments at scale.

09/30/2026, 7:30 AM • The Motley Fool

The Stock Market Is Going to Soar, According to Wall Street. Here’s What Investors Should Do.

Wall Street analysts project the S&P 500 will surge 21% to 9,275 over the next year, driven by strong corporate earnings growth of 32% in 2026, particularly from AI infrastructure spending. The article recommends investors consider buying low-cost S&P 500 index funds like the Vanguard S&P 500 ETF, citing Warren Buffett's endorsement and the difficulty of beating the index even for professional fund managers.

09/30/2026, 4:12 AM • The Motley Fool

History Says Nvidia's Record $150 Billion Buyback Is Good News for the Stock

Nvidia announced a record $150 billion addition to its share repurchase authorization, bringing the total to $235 billion. Historical data shows that large buyback announcements at both Apple and Nvidia have typically preceded 12-month periods of stock outperformance versus the S&P 500. However, the author argues that the underlying cash generation driving these buybacks, rather than the buybacks themselves, is the primary driver of stock gains. At current valuations, Nvidia trades at 15x expected fiscal 2028 earnings compared to Apple's 36x, making Nvidia's buyback more accretive per dollar spent.

09/29/2026, 8:43 PM • The Motley Fool

Prediction: Taiwan Semiconductor Manufacturing Will Hit a $3 Trillion Market Cap Before 2027 Is Over

An analyst predicts Taiwan Semiconductor Manufacturing (TSMC) will reach a $3 trillion market cap by end of 2027, requiring approximately 30% stock growth. The prediction is based on strong AI chip demand expected through 2029-2030, a planned $100 billion U.S. expansion, and Wall Street's expectation of 35% revenue growth next year. TSMC is positioned as a universal AI investment due to its foundry services for major chip designers.

09/29/2026, 4:29 PM • The Motley Fool

Want a $1 Million Investment Portfolio? History Says This Strategy Could Get You There.

The article outlines how everyday investors can build a $1 million portfolio through dollar-cost averaging and consistent S&P 500 investing. By investing $500-$2,000 monthly over 18-31 years, investors can reach millionaire status, with compound returns doing most of the heavy lifting. The S&P 500 has historically averaged 10.6% annual returns and outperforms 84% of actively managed funds, making it a reliable wealth-building strategy.

09/29/2026, 2:15 AM • The Motley Fool

Stock-Split Watch: Is Meta Platforms Next?

Meta Platforms' stock surged nearly 30% in September following the launch of its Muse AI assistant, reaching a 52-week high of $779.82. As the only Magnificent Seven member without a conventional stock split, the sharp rise has renewed speculation about a potential split. While fractional shares have reduced traditional split rationale, options contracts tied to 100-share lots could make a split more relevant. CFO Susan Li previously stated the company had no present plans for a split but would monitor market conditions, leaving the door open for reassessment.

09/29/2026, 1:13 AM • The Motley Fool

Broadcom vs. Marvell Technology: Which Semiconductor Stock Is a Better Buy in 2026?

The article compares Broadcom and Marvell Technology as AI semiconductor investments. Broadcom, a diversified titan with $63.9B in revenue and strong partnerships with major tech companies, is recommended as the better buy due to locked-in multi-year AI revenue commitments providing visibility. Marvell, growing faster at 42.1% revenue growth but with higher valuation multiples and customer concentration risk, is also positioned well but lacks Broadcom's forward revenue certainty.

09/28/2026, 4:09 PM • The Motley Fool

Jensen Huang Just Gave Investors 150 Billion Reasons to Buy Nvidia Stock

Nvidia announced a $150 billion share buyback program, bringing total authorization to $235 billion through fiscal 2028. The massive repurchase reflects management's confidence in sustained AI-driven growth and the company's robust cash generation. With strong earnings growth, shrinking share count, and attractive valuation, analysts view Nvidia as a compelling long-term investment in the AI infrastructure space.

09/28/2026, 1:15 PM • The Motley Fool

Apple Is the Best-Performing "Magnificent Seven" Stock This Year. But It Has Still Lagged This Unassuming Dividend Stock (That Remains a Top Buy Now).

While Apple has been the top performer among the Magnificent Seven stocks with a 25% year-to-date gain, Target has significantly outperformed with a 61% increase in 2026. Under new CEO Michael Fiddelke's turnaround plan, Target has reversed years of decline with positive sales growth and earnings revisions. Despite its strong performance, Target remains attractively valued at 15x forward earnings with a 2.95% dividend yield and a 55-year streak of consecutive dividend increases.

09/28/2026, 8:07 AM • The Motley Fool

Is PayPal a Deep Value Play Right Now?

PayPal's stock has fallen dramatically from pandemic highs and now trades at a steep discount (forward P/E of ~10x vs. 15x for financial industry). New CEO Enrique Lores is driving a turnaround focused on Venmo, Buy Now Pay Later, cost reduction, and AI-powered commerce. While the company faces real competition in checkout and slower growth, improving cash flow and new growth initiatives suggest the valuation could represent a bargain if management can stabilize the core business.

09/28/2026, 6:30 AM • The Motley Fool

Why Meta Platforms Stock Jumped 13% This Week

Meta Platforms stock surged 13% this week following the launch of its Muse personal AI agent and new integrated devices. The Muse app quickly became the top free iPhone app in the U.S., with capabilities including email management, shopping, and travel reservations. Meta also unveiled AI glasses and VR glasses that integrate with Muse, featuring partnerships with major retailers like Shopify and Walmart, positioning the company as a leader in the AI agent-driven market.

09/27/2026, 4:25 PM • The Motley Fool

This S&P 500 ETF Could Help Protect You Against One of the Stock Market's Biggest Risks Right Now

The S&P 500 has become heavily concentrated in large-cap tech stocks, with the top 10 holdings accounting for nearly 38% of the index. This concentration poses downside risk if tech stocks decline. The Invesco S&P 500 Equal Weight ETF (RSP) offers an alternative by weighting all S&P 500 companies equally, reducing tech sector exposure from 37.9% to 14.7% and providing better downside protection, though with lower upside potential.

09/27/2026, 7:19 AM • The Motley Fool

3 Fidelity ETFs to Buy for High Yields and Portfolio Diversification

The article highlights three Fidelity ETFs designed for investors seeking high yields with portfolio diversification and lower volatility. FDVV focuses on dividend-paying large and mid-cap companies with a 2.63% yield and 13.2% annualized returns over a decade. FYEE uses covered calls on S&P 500 stocks to generate a 9.11% yield but with tax implications. FIDI offers international diversification with a 3.89% yield and 19.9% annualized three-year returns, avoiding tech sector concentration.

09/27/2026, 4:20 AM • The Motley Fool

A $1,000 Investment Split Between Alphabet and Nvidia Will Be Worth This Much by 2030

The article projects that a $1,000 investment split between Alphabet and Nvidia could grow to over $3,000 by 2030. Nvidia is expected to quadruple revenue as global data center capital expenditures reach $3-4 trillion, while Alphabet is projected to achieve 25% compound annual growth through its AI investments in Google Search, cloud computing, and language models.

09/26/2026, 10:15 PM • The Motley Fool