Mega-Cap AI Euphoria Falters as NVDA, AMD, Earnings Loom; Valuation Reset Feared

NVIDIA's stock has climbed 20 percent since May 5, adding roughly $1 trillion in market capitalization in under two weeks. This meteoric rise has pushed the company close to a $5.7 trillion valuation, a milestone that has renewed debate about whether the AI capex supercycle has been priced to perfection or beyond. The stock's momentumThe empirical fact that winners keep winning over the medium term. is now a focal point for markets: every earnings miss or guidanceCompany-issued forecasts of future financial performance. cut could unwind weeks of gains, while every beat could extend the rally. Competitors like AMD, Broadcom, and other semiconductor leaders have likewise surged, but the breadth of the advance has started to show cracks as macro headwinds intensify.

The capex cycle driving the enthusiasm is real: data centers are burning through power and cooling capacity as AI models demand ever more compute. However, questions are emerging about timing and sustainability. Jensen Huang, CEO of NVIDIA, stated this week that humanity's energy needs will increase 1,000-fold due to AI demand, and that renewable energy buildout is critical. This signals both the scale of opportunity and the massive structural investment required. Goldman Sachs and other institutional players have been rotating into semiconductor exposure, but the current valuations leave little room for execution missteps. NVIDIA's earnings on May 22 will be the litmus test: guidanceCompany-issued forecasts of future financial performance. on datacenter demand, AI chip ASPs (average selling prices), and competitive threats from custom silicon will determine whether current prices hold or snap back.

The challenge is that AI enthusiasm has crowded into a narrow set of mega-caps, leaving the broader market vulnerable. Friday's selloff saw small caps outperform large caps, Russell 2000 gained 0.7 percent while Nasdaq fell 1.3 percent, signaling a widening performance gap. This rotation suggests that investors are taking profits in the most expensive AI stocks and hunting for value elsewhere. Broadcom, AMD, and other chip suppliers will also report next week, and a string of misses could trigger a meaningful repricing. Additionally, China's reported rejection of NVIDIA chips despite U.S. approval signals geopolitical headwinds that could constrain NVIDIA's addressable market, a risk that has not been fully priced in.

Bears argue that AI capex spending, while massive, is front-loaded and may peak within 1-2 years, leaving a long tail of consolidation and margin compression. Semis are also highly cyclical, and the current euphoria mirrors past cycles where valuations peaked just before demand normalized. Some traders point out that the Magnificent Seven have now become the Terrified Seven, with concentration risk and valuation extension making them vulnerable to any macro shock. Ackman's recent mega-cap buys (MSFT, Broadcom) suggest institutional conviction, but also highlight the binary nature of the bet: if AI capex slows or competition intensifies, downside is severe.