Steve Hanke, the Johns Hopkins economist, warned of a stock market bubble as Big Tech stocks drove a $10 trillion rally and call option volumes reached record highs. The surge reflects aggressive positioning in equities tied to artificial intelligence and mega-cap technology companies.
Call option trading activity spiked to all-time levels, signaling retail and institutional investors betting heavily on continued upside momentum. This concentration of leverage in options contracts mirrors conditions seen before previous market corrections. Hanke's warning aligns with broader concerns from other market observers about valuation extremes in the tech sector.
The $10 trillion move encompasses gains across the Magnificent Seven and related tech holdings. Nvidia, Tesla, Microsoft, Google, Apple, Meta, and Amazon have driven the bulk of S&P 500 gains this cycle. Tech dominance now represents roughly 35 percent of the broader index by market cap, the highest weighting since the 2000 dot-com bubble.
Options market structure matters here. Record call volume suggests investors are using leverage to amplify returns in a market where passive flows increasingly chase the same handful of names. When sentiment shifts, the unwinding of these positions can accelerate declines. Hanke's macro expertise centers on monetary policy and currency markets, but his warning resonates with technical analysts noting overbought conditions.
The rally occurred against a backdrop of Federal Reserve rate cuts and investor enthusiasm over AI productivity gains. Bond yields compressed, making growth stocks relatively more attractive. However, valuation multiples on forward earnings in mega-cap tech have expanded sharply, leaving little room for disappointment on earnings guidance or rate expectations.
Hanke stopped short of predicting when a correction would occur, but flagged the structural risks embedded in current market positioning. His warning carries weight given his track record on inflation and monetary cycles. The tech sector's outperformance remains dependent on execution and continued AI narrative momentum.
THE BOTTOM LINE: Tech sector concentration and record options leverage create binary risk, with downside acceleration possible if sentiment shifts or earnings disappoint.