#1 Restricted Stock granted by CMS Energy Corporation ("CMS") pursuant to CMS' Performance Incentive Stock Plan and subject to a three-year "cliff" vesting schedule.

#1 Shares of Common Stock of CMS Energy Corporation ("CMS") were forfeited of as a result of CMS failing to meet certain performance criteria established under the 2021 Restricted Stock Award granted to the reporting person in accordance with the provisions of the CMS Performance Incentive Stock Plan.

#2 The total holdings reflect an adjustment of 253 additional shares of Common Stock of CMS Energy Corporation ("CMS") acquired as a result of dividend reinvestment pursuant to the reporting person's participation in the CMS Stock Purchase Plan, and an adjustment of 5,124 additional shares of Restricted Stock purchased on behalf of the reporting person as a result of automatic acquisition of Restricted Stock in lieu of cash dividends pursuant to the terms of the award granted to the reporting person in accordance with the provisions of the CMS Performance Incentive Stock Plan.

#1 Shares of Common Stock of CMS Energy Corporation ("CMS") were forfeited of as a result of CMS failing to meet certain performance criteria established under the 2021 Restricted Stock Award granted to the reporting person in accordance with the provisions of the CMS Performance Incentive Stock Plan.

#2 The total holdings reflect an adjustment of 253 additional shares of Common Stock of CMS Energy Corporation ("CMS") acquired as a result of dividend reinvestment pursuant to the reporting person's participation in the CMS Stock Purchase Plan, and an adjustment of 5,124 additional shares of Restricted Stock purchased on behalf of the reporting person as a result of automatic acquisition of Restricted Stock in lieu of cash dividends pursuant to the terms of the award granted to the reporting person in accordance with the provisions of the CMS Performance Incentive Stock Plan.

#1 Shares of Common Stock of CMS Energy Corporation ("CMS") were acquired as a result of CMS exceeding certain performance criteria established under the 2021 Restricted Stock Award granted to the reporting person in accordance with the provisions of the CMS Performance Incentive Stock Plan.

#2 The total holdings reflect an adjustment of 110 additional shares of Common Stock of CMS Energy Corporation ("CMS") acquired as a result of dividend reinvestment pursuant to the reporting person's participation in the CMS Stock Purchase Plan, and an adjustment of 2,288 additional shares of Restricted Stock purchased on behalf of the reporting person as a result of automatic acquisition of Restricted Stock in lieu of cash dividends pursuant to the terms of the award granted to the reporting person in accordance with the provisions of the CMS Performance Incentive Stock Plan.