X0306 4 2022-03-01 0 0000893949 MEDNAX, INC. MD 0001208541 ORDAN MARK S 1301 CONCORD TERRACE SUNRISE FL 33323 1 1 0 0 Chief Executive Officer Common Stock 2022-03-01 4 A 0 76253 0.00 A 313249 D Common Stock 2022-03-01 4 A 0 76253 0.00 A 389502 D Common Stock 2022-03-01 4 F 0 20691 23.47 D 368811 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. Twenty-five percent (25%) of the restricted shares will vest on March 1, 2023, twenty-five percent (25%) of the restricted shares will vest on March 1, 2024 and fifty percent (50%) of the restricted shares will vest on March 1, 2025, subject to the terms of the Plan. Includes 28,571 restricted shares granted pursuant to the Plan in connection with achievement in excess of target of specified performance-based criteria for the performance period from January 1, 2021 through December 31, 2021. Restricted shares granted pursuant to 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 38,127 additional shares based on the achievement of certain performance-based criteria for the twelve months ending December 31, 2022. 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 percent (25%) on March 1, 2023, twenty-five percent (25%) on March 1, 2024 and fifty percent (50%) on March 1, 2025, subject to the terms of the Plan. Represents 20,691 restricted shares withheld for payment of taxes upon vesting of shares. /s/ Dominic J. Andreano, Attorney-in-Fact 2022-03-03