J P M O R G A N Global Index Research 13 July 2026 J.P. Morgan Private Assets Index (JPAX) - Middle Market Index Monitor - June 2026 In May 2026, we launched the J.P. Morgan Private Assets Index (JPAX)- Middle Market, the inaugural index in a broader private markets index suite. As an institutional-grade benchmark built on verified company financials for the U.S. private middle market, JPAX-Middle Market tracks operating performance and equity value growth of over 6,400 mid-sized U.S. private companies with ...