X0306 4 2021-08-30 0 0000893949 MEDNAX, INC. MD 0001208541 ORDAN MARK S 1301 CONCORD TERRACE SUNRISE FL 33323 1 1 0 0 Chief Executive Officer Common Stock 2021-08-30 4 M 0 95000 17.65 A 303425 D Common Stock 2021-08-30 4 S 0 95000 35.09 D 208425 D Employee Stock Option (right to buy) 17.65 2021-08-30 4 M 0 95000 17.65 D 2023-10-10 Common Stock 95000 455331 D Shares acquired upon exercise of Stock Options granted pursuant to Issuer's Amended and Restated 2008 Incentive Compensation Plan (the "Plan"). The price reported in Column 4 is a weighted average price. The reported securities were sold in multiple transactions with prices ranging from $34.965 to $35.235 for a weighted average sales price of $35.09. 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. Option to purchase shares of common stock granted on July 12, 2020 ("Grant Date") under the Plan that vested as follows: (i) 175,747 shares became exercisable when the Issuer's common stock price closed at $22 per share (or above) for 40 consecutive trading days before the third anniversary of the Grant Date (the "Performance End Date"); (ii) 181,160 shares became exercisable when the Issuer's common stock price closed at $25 per share (or above) for 40 consecutive trading days before the Performance End Date; and (iii) 193,424 shares became exercisable when the Issuer's common stock price closed at $29 per share (or above) for 40 consecutive trading days before the Performance End Date, in each case subject to the reporting person's Employment Agreement and provided that no option shares vested prior to the one-year anniversary of the Grant Date. /s/ Dominic J. Andreano, as Attorney-in-Fact 2021-08-31