G MICHAEL SIEVERT
CIK 1182438 · President and CEO · last filed 2026-06-03
G MICHAEL SIEVERT is a President and CEO who has filed 105 SEC Form 4 insider transactions across 9 companies since 2008. The most recent filing shows the insider was granted $189.6K of ALK on Jun 3, 2026. Across all open-market trades the lifetime net is −$197.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $73.1M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$73.10M
9
105
-$197.09M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ALK | Director | 4,258 | $45.93 | $195.6K | $0 | 1 | 2026-06-03 |
| SBUX | Director | 10,878 | $103.65 | $1.13M | $0 | 4 | 2026-03-27 |
| TMUSZ | Director | 125,695 | $20.22 | $2.54M | -$41.74M | 6 | 2026-02-25 |
| TMUS | President and CEO | 381,221 | $181.61 | $69.23M | -$154.31M | 52 | 2025-05-21 |
| T-Mobile US, Inc. (TMUSR) Delisted | President and CEO | — | — | — | $0 | 1 | 2020-07-02 |
| T-Mobile US, Inc. (TMUSP) Delisted | Chief Operating Officer | 379,157 | — | — | $0 | 2 | 2017-06-07 |
| T-Mobile US, Inc. (TMUS.P) Delisted | Chief Operating Officer | 325,331 | — | — | $0 | 2 | 2016-02-26 |
| Clearwire Corp /DE (CLWRR) Delisted | Chief Commercial Officer | 306,190 | — | — | -$1.04M | 2 | 2010-05-24 |
| Switch & Data Facilities Company, Inc. (SDXC) Delisted | Director | 0 | — | — | $0 | 4 | 2010-05-04 |
Recent Filings
105 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-03 | ALK | Grant (A) | +4,258 | $189.6K | EDGAR |
| 2026-03-27 | SBUX | Grant (A) | +3,667 | $0 | EDGAR |
| 2026-02-25 | TMUSZ | Sell (S) | −15,000 | -$3.30M | EDGAR |
| 2026-02-24 | TMUS | Notice (144) | −1,089 | -$241.6K | EDGAR |
| 2026-02-23 | TMUS | Notice (144) | −13,911 | -$3.06M | EDGAR |
| 2026-02-23 | TMUSZ | Sell (S) | −80,000 | -$17.20M | EDGAR |
| 2026-02-19 | TMUS | Notice (144) | −80,000 | -$17.20M | EDGAR |
| 2025-12-04 | TMUSZ | Gift (G) | −65,500 | $0 | EDGAR |
| 2025-11-19 | TMUSZ | Sell (S) | −45,000 | -$9.70M | EDGAR |
| 2025-11-18 | TMUS | Notice (144) | −22,500 | -$4.88M | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.