Initiate a 20-25% starter position in BlackRock at current levels ($1,136) given the combination of franchise quality (76% IBIT market share, $15.3T AUM platform, 27% YoY revenue acceleration) and confirmed momentum (+17.8% in six weeks), with a hard stop at $1,098 (~3.3% below entry) to price in the beta asymmetry (1.43) and price-volume divergence concerns while preserving capital for staged re-entry triggers at $1,110, $1,039, and breakout confirmation above $1,155 on volume >700K shares.