Performance Measurement & Attribution (PMA) software calculates ex-post portfolio returns and decomposes investment performance to identify sources of alpha and risk across factors, sectors, securities, and currencies. Asset managers, pension funds, and institutional investors use these platforms to generate GIPS-compliant performance reports, construct composites, analyze benchmark-relative returns, and demonstrate value to clients and stakeholders. The category encompasses time-weighted and money-weighted return methodologies, Brinson attribution models, factor-based attribution analysis, and comprehensive performance analytics that span multiple asset classes and investment strategies. PMA solutions integrate with portfolio management systems and custodial platforms to automate performance calculations and streamline regulatory reporting workflows. Established category participants include FactSet, Bloomberg, MSCI, BNY Mellon, SS&C, StatPro, Clearwater Analytics, and Northern Trust.