 CUPERTINO, Calif., June 28, 2021 GLOBE NEWSWIRE -- Reviva Pharmaceuticals Holdings, Inc. NASDAQ: RVPH along with its subsidiaries, Reviva or the Company, a clinical-stage pharmaceutical company developing therapies that seek to address unmet medical needs in the areas of central nervous system CNS, cardiovascular, metabolic, and inflammatory diseases, announced today it has joined the broad-market Russell Microcap Index at the conclusion of the Russell U.S. Indexes annual reconstitution. The updated Index will become effective after the U.S. equity market opens today, Monday June 28, 2021. 