Core Viewpoint - The U.S. stock market is experiencing a resurgence of speculative trading, with a key "irrational exuberance" indicator surpassing bubble warning levels, indicating potential risks in asset prices deviating from fundamental values [1][3]. Group 1: Market Indicators - The Barclays "irrational exuberance index" has reached a warning level of 10.7%, the first time it has crossed the double-digit threshold since February, with a historical average of around 7% [1][3]. - The index is based on derivatives market data, volatility indicators, and options market sentiment signals, and has previously peaked during the late 1990s internet bubble and the 2021 retail trading frenzy [1]. Group 2: Market Sentiment - Current market optimism is driven by expectations of trade agreements between the U.S. and major partners, as well as speculation that the Trump administration may delay tariff implementation [3]. - The S&P 500 index recently achieved a historical closing high, marking the first such occurrence since February, fueled by ongoing expectations of Federal Reserve interest rate cuts [3]. Group 3: Sector Performance - The number of new SPACs in 2025 has already exceeded the total for the previous two years, indicating a significant increase in speculative activity [3]. - The ARK Innovation ETF has recorded a year-to-date increase that ranks as the third highest in history, following the post-COVID-19 rebound [3]. - Specific sectors have shown extreme performance, with Bitcoin-related stocks surging 78%, quantum computing stocks rising 69%, and meme stocks averaging a 44% increase [3]. Group 4: Investor Behavior - The irrational exuberance indicator is highly correlated with retail participation metrics, such as net margin account positions [4]. - Despite the presence of bubble signals, timing the market remains challenging, as historical trends show that bubbles often last longer than anticipated [4]. - Investors are advised to construct risk-hedging portfolios using options to mitigate potential downturns in the current environment of abundant liquidity and speculative enthusiasm [4].