SIEVERT G MICHAEL (CIK 1182438) reported 25 SEC Form 4 insider transactions across 3 companies over the past 18 months (most recent 2026-06-03). Recent activity: Buy ALK (4,258 shares), Buy SBUX (3,667 shares), Sell TMUS (13,911 shares), Sell TMUS (1,089 shares), Sell TMUS (80,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-03 | ALASKA AIR GROUP, INC. (ALK) | Director | Buy | 4,258 | $189,566 |
| 2026-03-27 | STARBUCKS CORP (SBUX) | Director | Buy | 3,667 | $0 |
| 2026-02-25 | T-Mobile US, Inc. (TMUS) | Director | Sell | 13,911 | $3.1M |
| 2026-02-25 | T-Mobile US, Inc. (TMUS) | Director | Sell | 1,089 | $241,595 |
| 2026-02-23 | T-Mobile US, Inc. (TMUS) | Director | Sell | 80,000 | $17.2M |
| 2025-12-04 | T-Mobile US, Inc. (TMUS) | Director | Sell | 65,500 | $0 |
| 2025-11-19 | T-Mobile US, Inc. (TMUS) | Director | Sell | 22,500 | $4.9M |
| 2025-11-19 | T-Mobile US, Inc. (TMUS) | Director | Sell | 22,500 | $4.8M |
| 2025-11-12 | T-Mobile US, Inc. (TMUS) | Director | Sell | 44,140 | $9.1M |
| 2025-11-12 | T-Mobile US, Inc. (TMUS) | Director | Buy | 135,915 | $0 |
| 2025-11-12 | T-Mobile US, Inc. (TMUS) | Director | Sell | 53,483 | $11.1M |
| 2025-11-12 | T-Mobile US, Inc. (TMUS) | Director | Sell | 43,318 | $0 |
| 2025-08-20 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 22,500 | $5.8M |
| 2025-08-20 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 22,500 | $5.8M |
| 2025-05-21 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 22,500 | $5.5M |
| 2025-05-21 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 22,500 | $5.4M |
| 2025-04-03 | T-Mobile US, Inc. (TMUS) | President and CEO | Buy | 127,631 | $0 |
| 2025-04-03 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 50,223 | $13.5M |
| 2025-03-14 | STARBUCKS CORP (SBUX) | Director | Buy | 3,141 | $0 |
| 2025-02-27 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 22,500 | $6.1M |
| 2025-02-27 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 22,500 | $5.9M |
| 2025-02-19 | T-Mobile US, Inc. (TMUS) | President and CEO | Buy | 48,441 | $0 |
| 2025-02-19 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 26,302 | $7.1M |
| 2025-02-19 | T-Mobile US, Inc. (TMUS) | President and CEO | Buy | 88,294 | $0 |
| 2025-02-19 | T-Mobile US, Inc. (TMUS) | President and CEO | Sell | 34,744 | $9.4M |
Source: SEC Form 4 filings · as of 2026-06-03