Citi Warns Nasdaq 100 at Risk of Sharp Pullback as Tech Longs Become Extremely Overcrowded

Citi strategists warned on June 2, 2026, that long positions in U.S. technology stocks have reached “extremely overcrowded” levels, leaving the Nasdaq 100 index vulnerable to a wave of profit-taking and forced long unwinding. The AI-driven rally has pushed bullish bets to extremes. Since hitting a low in late March 2026, the S&P 500 has gained 20% while the Nasdaq 100 surged 33%. Momentum indicators signal the Nasdaq 100 has been in technically overbought territory for nearly six consecutive weeks. Over the past week, inflows into risk assets came predominantly from new long positions rather than short covering, further swelling the crowding. Citi strategists said the overextended bullish positioning in the Nasdaq means any negative catalyst could trigger a cascading sell-off. The S&P 500, while approaching similarly crowded levels, still retains a meaningful short base that could fuel a short-squeeze if gains persist, offering near-term support. In Europe, the Euro Stoxx 50 index remains moderately bearish, weighed by Middle East geopolitical concerns. However, with most short positions already in loss territory, any positive geopolitical development could spark a sharp short-squeeze rally, Citi noted.