Axioma AX-US5.1 MH & SH Model (US5.1_MH_S) is a multi-factor US equity risk model designed for institutional investors managing medium- and short-horizon equity portfolios. The model provides daily updates for liquidity, momentum, volatility, crowding, short interest, profitability, leverage, investment, dividend yield, and market sensitivity factors to support portfolio construction, risk decomposition, stress testing, and quantitative portfolio management.