X0306 4 2021-03-01 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 2021-03-01 4 A 0 30612 0.00 A 100249 D Common Stock 2021-03-01 4 A 0 30613 0.00 A 130862 D Common Stock 2021-03-01 4 F 0 6244 24.43 D 124800 D Restricted shares granted pursuant to the Issuer's Amended and Restated 2008 Incentive Compensation Plan (the "Plan"), in connection with an annual equity award. The number of shares being reported represents the "target" number of restricted shares and does not include the right of the reporting person to receive up to 15,306 additional shares based on the achievement of certain performance-based criteria for the twelve months ending December 31, 2021. The actual number of shares earned could be less than or greater than the target number, depending on the level of performance achieved, and all of the restricted shares granted are subject to forfeiture if minimum levels of performance are not met. Any restricted shares earned will not vest any earlier than in three installments of twenty-five (25%) on March 1, 2022, twenty-five (25%) on March 1, 2023 and fifty (50%) on March 1, 2024, subject to the terms of the Plan. Restricted shares granted pursuant to the Issuer's Plan, in connection with an annual equity award. Twenty-five percent (25%) of the restricted shares will vest on March 1, 2022, twenty-five percent (25%) of the restricted shares will vest on March 1, 2023 and fifty percent (50%) of the restricted shares will vest on March 1, 2024. Represents 6,244 shares withheld for payment of taxes upon vesting of shares previously reported. Includes 182 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 2021-03-03