8 sectors are rotating · 3 stable
Eight of the eleven S&P 500 sectors are flipping the year-over-year relative-strength sign this week, and the pattern is a textbook defensive-plus-cyclical-value rotation occurring INSIDE a market correction — SPY is -3.4% over the 30-day window while seven of the eight rotators are turning positive on RS. Health Care (+12.4pp swing), Utilities (+10.5pp), Real Estate (+10.3pp), Consumer Staples (+9.8pp), Financials (+9.8pp), Industrials (+9.3pp) and Materials (+6.3pp) all flipped from RS-negative a year ago to RS-positive now. The lone "turning_negative" sector is Communication Services (-6.8pp swing), driven by the mega-cap interactive media names (META, GOOGL, NFLX) digesting AI-capex valuation alongside the broader risk-off.\n\nThe single most consequential surprise is Financials — specifically regional banks. KRE absorbed +$4.96B in net 10-day money flow, the largest single-ETF inflow in this scan, with KBE adding +$305M. This is institutional positioning for a steeper curve and bank-cap relief that hasn't yet shown up in headline indices. The second surprise is biotech leadership inside Health Care: XBI absorbed +$14.2B in net 10-day flow and IBB +$2.5B as M&A speculation and pipeline data re-rate small/mid biotech after twenty months of dormancy. Technology (XLK) is the most fragile "stable" — RS narrowed from +3.83pp to +0.32pp; another leg lower in semis would flip it.
Health Care
XLVHealth Care reclaimed leadership after a year of trailing SPY by 2.8pp; this window it leads by 9.7pp. Two drivers stacked. First, biotech specifically — XBI +14.3%, IBB +8.8% — as renewed M&A talk and constructive pipeline data re-rate small/mid biotech after twenty months of dormancy. Second, classic defensive bid as SPY corrects ~3.4% off June highs and the broader market pivots toward earnings visibility. Money flow confirms both legs: XBI absorbed +$14.2B in net 10-day inflow (highest in the scan), XLV itself +$4.1B, IBB +$2.5B.