Retail investors chase AI upside as pros stay cautious and Nasdaq longs pile up

US equity market positioning is increasingly stretched as retail investors pour record inflows into AI-linked stocks while professional managers remain more cautious. Barclays said end investors have shifted from buying dips to chasing upside in tech funds, a change that often leaves crowded trades vulnerable to sharp reversals. Citi warned that Nasdaq longs are deeply profitable and extended, making the index especially exposed to any negative catalyst such as a hawkish Fed comment, weak AI earnings, or geopolitical shock. Broader risk appetite has improved somewhat, with Russell 2000 positioning rising and European markets benefiting from short covering, but those trends appear less durable. Overall, the article frames the AI/Nasdaq trade as bullish in the short term but fragile beneath the surface, with momentum and crowded positioning increasing downside risk.