[MARKET UPDATE] US indices slide throughout the US afternoon as tech/AI weakness resumes despite optimism on US/Iran diplomacy; NDX -1.3% with the tech sector -2.6%, but RSP +0.75% and majority of sectors gaining, showing positive breadth

US indices slide throughout the US afternoon as tech/AI weakness resumes despite optimism on US/Iran diplomacy; NDX -1.3% with the tech sector -2.6%, but RSP +0.75% and majority of sectors gaining, showing positive breadth.

Afternoon slides concentrated in the mega-cap tech and AI complex with equal-weight advancing and a majority of sectors higher describe a rotation episode rather than a broad risk-off move, a pattern that has recurred whenever crowded growth leadership has wobbled. Historically, sessions where cap-weighted indices fall while breadth improves have tended to mark leadership churn inside the market rather than the start of systemic deleveraging; the tell for the latter has been breadth turning negative alongside the index, credit spreads widening, and defensives leading rather than merely participating. The divergence between the Nasdaq 100 and the equal-weight S&P is the mechanism here: index-level weakness is a concentration story, not an earnings or macro repricing across the tape. Geopolitical de-escalation on the US-Iran axis running concurrently with equity weakness fits the established pattern in which diplomatic optimism relieves the crude and haven bid without arresting sector-specific profit-taking. Worth noting is that flows of this kind, selling the winners to fund the laggards, have in past episodes persisted across multiple sessions once begun, particularly into month-end rebalancing windows. Follow-ons are whether semis and the AI-adjacent complex find a floor at prior consolidation levels and whether breadth holds positive on further index weakness, which would confirm rotation rather than distribution.