Are US Stocks in a Bubble? Diverging Views from Wall Street Experts

By Patricia Miller


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Differing views emerge on a potential market bubble in US stocks. Retail investors should heed warnings and evaluate risks for their portfolios.

Bubble against a stock market chart.
Differing views emerge on a potential market bubble in US stocks.

What You Need To Know

According to JPMorgan Chase & Co.'s (NYSE: JPM) chief market strategist Marko Kolanovic, the recent surge in US equities and Bitcoin's rise above $60,000 suggest that a bubble may be forming in the market. He believes that the rapid increase in asset prices is unsustainable and reminiscent of past bubbles in the late-1990s and the post-pandemic mania of 2021.

However, Goldman Sachs Group Inc.'s (NYSE: GS) David Kostin disagrees and argues that the high valuations of Big Tech companies are justified by their fundamentals. The S&P 500 Index, driven by gains in technology giants, continues to reach new highs, attracting both critics who believe the bullish run is unsustainable and optimists who believe there is room for further gains.

Kolanovic warns that investors may be too complacent and not fully appreciating the risks involved in the current market environment. Higher stock prices could lead to longer periods of elevated monetary policy and potentially inflate asset prices further or contribute to inflation.

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Why This Is Important for Retail Investors

  1. Identifying a potential market bubble can help retail investors make informed decisions about their investment strategies. If there is a bubble forming in the market, it may indicate that asset prices are rising at an unsustainable pace, which could lead to a significant market correction. Retail investors need to be aware of this possibility to protect their portfolios and avoid potential losses.

  2. Understanding the differing viewpoints of experts on whether a bubble exists can provide valuable insights for retail investors. By considering the arguments and opinions of professionals like Marko Kolanovic and David Kostin, retail investors can gain a better understanding of the factors at play in the market and evaluate the risks and potential rewards more effectively.

  3. A market bubble has the potential to impact various sectors and industries differently. Retail investors can use this information to assess the potential risks and opportunities within specific sectors or stocks. It may prompt them to reassess their asset allocation and consider diversifying their portfolios to mitigate potential losses in case of a market downturn.

  4. The behavior of major stock indexes, such as the S&P 500, can influence market sentiment and investor behavior. If retail investors are aware of the discussions surrounding a potential bubble in US stocks, they can make more informed decisions about their investment actions and adjust their risk appetite accordingly.

  5. The valuation of growth stocks, particularly in the technology sector, can have a significant impact on retail investors' portfolios. Understanding the arguments for and against the current valuations can help retail investors assess whether the companies they have invested in are overvalued or undervalued. This knowledge can guide them in making adjustments to their investment positions and manage their exposure to potential risks associated with inflated valuations.

How Can You Use This Information?

Here are some of the investing ideas that can be explored using this information:

Value Investing

Retail investors can assess whether the potential bubble has caused certain stocks or sectors to become overvalued, providing opportunities for value investing strategies in undervalued assets.

Value investing searches for undervalued companies that trade for less than their intrinsic values, with the expectation that they will eventually be recognized by the market.

Defensive investing

Concerns about a market bubble may prompt retail investors to adopt a defensive investing approach, focusing on stocks or sectors that are considered more resistant to market downturns.

Defensive Investing focuses on securing a portfolio by choosing companies that are less sensitive to economic downturns.


The possibility of a market bubble emphasizes the importance of diversification. Retail investors can consider spreading their investments across different asset classes, sectors, and regions to mitigate the risks associated with a potential market correction.

Diversification spreads investments across various assets to reduce risk and volatility in a portfolio.

Sector Rotation

Retail investors can evaluate their sector allocations in light of the discussions surrounding a potential market bubble. They may choose to rotate their investments into sectors that are less susceptible to the risks associated with an overheated market.

Sector Rotation is the practice of shifting investment capital from one industry sector to another to take advantage of the economic cycle.

Income Investing

Amid concerns over a market bubble, retail investors may seek income-generating investments as a defensive strategy. Dividend-paying stocks or other income-focused assets may provide stability and cash flow in uncertain market conditions.

Income investing targets steady earnings, typically through dividends from stocks or interest from bonds, providing investors with a regular income stream.

Read What Others Are Saying

Bloomberg: JPMorgan Sees ‘Froth’ in US Stocks, While Goldman Says Rally Justified

Yahoo: Remember, the AI stock bubble will overinflate and deflate from time to time

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What you should read next:

Popular ETFs

Some investors prefer to invest in stocks via an exchange-traded fund for ease and reduced risk. Some popular ETFs include the following:

Technology and Big Tech Exposure:

  • Technology Select Sector SPDR Fund (XLK): Offers exposure to technology sector giants within the S&P 500, including those companies Kostin mentions as having fundamentals that justify their high valuations.

  • Vanguard Information Technology ETF (VGT): Another way to gain broad exposure to the U.S. technology sector, including companies driving the S&P 500's gains.

Broad Market Exposure:

  • SPDR S&P 500 ETF Trust (SPY): Tracks the S&P 500 Index, providing diversified exposure to the largest U.S. companies across sectors, reflecting the market's overall performance.

  • iShares Core S&P 500 ETF (IVV): Similar to SPY, this ETF offers exposure to the S&P 500 Index, capturing the performance of large-cap U.S. stocks.

Cryptocurrency Exposure:

  • Grayscale Bitcoin Trust (GBTC): While not an ETF, GBTC allows investors to gain exposure to Bitcoin's price movements without directly purchasing Bitcoin, which Kolanovic highlights as a sign of market froth.

  • Bitwise 10 Crypto Index Fund (BITW): Offers exposure to Bitcoin and other cryptocurrencies, aiming to track the performance of Bitwise's 10 large-cap crypto index.

Hedging Strategies:

  • ProShares Short S&P500 (SH): For those concerned about a potential market downturn as suggested by Kolanovic, this ETF provides inverse exposure to the S&P 500, allowing investors to hedge against declines.

  • Direxion Daily S&P 500 Bear 3X Shares (SPXS): Offers leveraged inverse exposure to the S&P 500, suitable for those anticipating short-term declines in market valuations.

Growth vs. Value:

  • iShares Russell 1000 Growth ETF (IWF): Focuses on large-cap U.S. companies with growth characteristics, suitable for investors banking on continued gains in tech and other growth sectors.

  • Vanguard Value ETF (VTV): For those aligning with Kostin's perspective on seeking fundamentally justified valuations, this ETF provides exposure to large-cap U.S. value stocks.

Explore more on these topics:



This article does not provide any financial advice and is not a recommendation to deal in any securities or product. Investments may fall in value and an investor may lose some or all of their investment. Past performance is not an indicator of future performance.

Patricia Miller does not hold any position in the stock(s) and/or financial instrument(s) mentioned in the above article.

Patricia Miller has not been paid to produce this piece by the company or companies mentioned above.

Digitonic Ltd, the owner of, does not hold a position or positions in the stock(s) and/or financial instrument(s) mentioned in the above article.

Digitonic Ltd, the owner of, has not been paid for the production of this piece by the company or companies mentioned above.

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