G MICHAEL SIEVERT
CIK 1182438 · President and CEO · last filed 2026-06-03
"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.
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Disclosed Exposure
$73.08M
Companies
9
Total Filings
105
Lifetime Open-Market Net
-$197.09M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ALK | Director | 4,258 | $45.84 | $195.2K | $0 | 1 | 2026-06-03 |
| SBUX | Director | 10,878 | $104.14 | $1.13M | $0 | 4 | 2026-03-27 |
| TMUSZ | Director | 125,695 | $20.29 | $2.55M | -$41.74M | 6 | 2026-02-25 |
| TMUS | President and CEO | 381,221 | $181.52 | $69.20M | -$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 · Page 10 of 11
105 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2016-06-07 | TMUS | Tax (F) | −4,271 | -$186.3K | EDGAR |
| 2016-02-26 | T-Mobile US, Inc. (TMUS.P) Delisted | Mixed | +45,209 | -$844.5K | EDGAR |
| 2016-01-05 | T-Mobile US, Inc. (TMUS.P) Delisted | Mixed | +99,218 | -$2.80M | EDGAR |
| 2015-06-09 | TMUS | Mixed | −7,226 | -$291.0K | EDGAR |
| 2015-02-27 | TMUS | Mixed | +43,183 | -$706.8K | EDGAR |
| 2013-06-12 | TMUS | Grant (A) | +92,389 | $0 | EDGAR |
| 2011-03-03 | — | Mixed | +57,335 | -$12.9K | |
| 2010-09-20 | — | Grant (A) | +50,000 | $0 | |
| 2010-05-24 | Clearwire Corp /DE (CLWRR) Delisted | Sell (S) | −133,334 | -$1.04M | EDGAR |
| 2010-05-04 | Switch & Data Facilities Company, Inc. (SDXC) Delisted | Disp (D) | −11,154 | $0 | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.
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.