G. Michael Sievert
President and CEO at T-Mobile US Inc.
Sits on 3 boards. Last updated September 28, 2026
Time on boards
- Boards served
- 3
- Current seats
- 3
- Board service
- 7 years
- Director since
- 2023
7 years of board service in total across 3 boards, counting each seat separately. Longest: T-Mobile US Inc., 3 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
T-Mobile US Inc. June 16, 202690.2%
-
T-Mobile US Inc. June 6, 202590.8%
-
T-Mobile US Inc. June 12, 202491.9%
-
T-Mobile US Inc. June 16, 202390.0%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 1, 2026 | Alaska Air Group Inc. | Grant or award | +4,258 | $44.52 | $189,566 |
| Mar 25, 2026 | Starbucks Corporation | Grant or award | +3,667 | — | — |
| Feb 24, 2026 | T-Mobile US Inc. | Open-market sale | −1,089 | $221.85 | $241,595 |
| Feb 23, 2026 | T-Mobile US Inc. | Open-market sale | −13,911 | $220.07 | $3,061,394 |
| Feb 19, 2026 | T-Mobile US Inc. | Open-market sale | −80,000 | $214.94 | $17,195,200 |
| Dec 3, 2025 | T-Mobile US Inc. | Gift | −65,500 | — | — |
| Nov 18, 2025 | T-Mobile US Inc. | Open-market sale | −22,500 | $214.25 | $4,820,625 |
| Nov 17, 2025 | T-Mobile US Inc. | Open-market sale | −22,500 | $216.97 | $4,881,825 |
| Nov 10, 2025 | T-Mobile US Inc. | Gift | −43,318 | — | — |
| Nov 9, 2025 | T-Mobile US Inc. | Shares withheld for tax | −44,140 | $207.00 | $9,136,997 |
| Nov 9, 2025 | T-Mobile US Inc. | Grant or award | +135,915 | — | — |
| Nov 9, 2025 | T-Mobile US Inc. | Shares withheld for tax | −53,483 | $207.00 | $11,070,888 |
| Aug 19, 2025 | T-Mobile US Inc. | Open-market sale | −22,500 | $257.17 | $5,786,325 |
| Aug 18, 2025 | T-Mobile US Inc. | Open-market sale | −22,500 | $255.58 | $5,750,550 |
| May 20, 2025 | T-Mobile US Inc. | Open-market sale | −22,500 | $240.99 | $5,422,275 |
Questions about G. Michael Sievert
What boards is G. Michael Sievert on?
G. Michael Sievert sits on the boards of Alaska Air Group Inc., Starbucks Corporation and T-Mobile US Inc.
What company is G. Michael Sievert the CEO of?
G. Michael Sievert is President and CEO of T-Mobile US Inc.
How long has G. Michael Sievert served on boards?
Our records show at least 7 years of board service across 3 boards, the earliest from 2023.
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