S&P 500 dips 0.6%, healthcare leads losses, energy gains

The sharp divergence between healthcare's 2.5% drop and energy's 1.2% gain points to sector rotation rather than broad risk-off sentiment, especially as the Nasdaq 100's mild decline masks a 10%+ single-stock swing. This suggests idiosyncratic factors, not macro stress, are driving moves. For market watchers, the key question is whether healthcare's weakness reflects a durable shift in investor preference or a one-off repricing, and whether energy's strength can persist amid mixed sectoral signals.