X0306 4 2020-05-27 0 0000015615 MASTEC INC MTZ 0001307141 Dwyer Robert J 880 SOUTH OCEAN BOULEVARD PALM BEACH FL 33480 1 0 0 0 Common stock 2020-05-27 4 S 0 5945 41.0858 D 15000 D The price reported in Column 4 is a weighted average price. These shares were sold in 17 separate transactions with prices ranging from $41.01 to $41.16 for an average weighted sales price of $41.0858. The reporting person undertakes to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. \s\ Albert de Cardenas For: Robert Dwyer 2020-05-29