X0306 4 2021-11-10 0 0000893949 MEDNAX, INC. MD 0001826596 Hinson Roger Mack 1301 CONCORD TERRACE SUNRISE FL 33323 0 1 0 0 Pres., PDX & OBX Medical Group Common Stock 2021-11-10 4 S 0 8800 28.38 D 107391 D Sales made pursuant to reporting person's 10b5-1 trading plan adopted June 15, 2021. The price reported in Column 4 is a weighted average price. The reported securities were sold in multiple transactions with prices ranging from $28.13 to $28.55 for a weighted average sales price of $28.38. 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. Includes 62 shares acquired by reporting person through Issuer's Employee Stock Purchase Plan since the last Form 4 filing. /s/ Dominic J. Andreano, Attorney-in-Fact 2021-11-10