Former T-Mobile CEO Mike Sievert to Leave Board as Vice Chair Term Ends

G. Michael Sievert, who led T-Mobile US as chief executive until last year, is leaving the wireless carrier's board, closing out a one-year stint as vice chair that followed his handoff of the top job.

Sievert told the board on Oct. 26 that he will resign as a director and from its Transaction Committee effective Nov. 1, 2026, according to an 8-K filed Wednesday. On the same date he will stop serving as Vice Chair of both the board and the company.

The filing says his resignation is not the result of any disagreement with T-Mobile on any matter relating to its operations, policies or practices.

The end of a planned term

The timing lines up with an arrangement T-Mobile disclosed in September 2025. Under an amendment to his employment agreement, Sievert's term as Vice Chairman of the company and of the board was set to initially end on Nov. 1, 2026, and could be extended only by mutual written agreement, according to an 8-K filed at the time.

Wednesday's filing says the effective date of his resignation is concurrent with the expiration of that amendment.

How the CEO handoff worked

In September 2025, T-Mobile's board named Chief Operating Officer Srinivasan Gopalan as President and CEO effective Nov. 1, 2025, with Sievert moving into the new executive role of Vice Chairman while staying on the board, the earlier filing said.

That filing also identified Sievert as a board designee of Deutsche Telekom under T-Mobile's stockholders' agreement with Deutsche Telekom and SoftBank Group.

Under the 2025 amendment, Sievert was paid an annual base salary of $7 million as Vice Chairman and was not eligible for new annual short-term incentive or long-term incentive awards unless the company decided otherwise.

What the filing does not say

The new 8-K does not name a successor director, describe any change to the Transaction Committee's membership beyond Sievert's exit, or say what Sievert plans to do next. It was signed by Chief Financial Officer Peter Osvaldik.

Sources

1. T-Mobile Form 8-K reporting G. Michael Sievert board resignation (Item 5.02), filed Oct. 28, 2026 (accession 0001193125-26-435233)
2. T-Mobile Form 8-K from September 2025 reporting CEO succession and Sievert Vice Chairman amendment (Item 5.02), filed Sept. 22, 2025 (accession 0001193125-25-209990)

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