REVIVA PHARMACEUTICALS HOLDINGS, INC. 3,276,262 OF SHARES OF COMMON STOCK, PAR VALUE $0.0001 PER SHARE PRE-FUNDED WARRANTS TO PURCHASE 1,485,643 SHARES OF SHARES OF COMMON STOCK, $0.0001 PAR VALUE PER SHARE WARRANTS TO PURCHASE 4,761,905 SHARES OF...