Howell Stephen Mitchell Jr. (CIK 2025334) reported 10 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-08-14). Recent activity: Sell RIOT (21,198 shares), Sell RIOT (153,162 shares), Sell RIOT (21,966 shares), Sell RIOT (29,482 shares), Buy RIOT (197,316 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-14 | Riot Platforms, Inc. (RIOT) | COO | Sell | 21,198 | $0 |
| 2026-08-04 | Riot Platforms, Inc. (RIOT) | COO | Sell | 153,162 | $3.1M |
| 2026-07-06 | Riot Platforms, Inc. (RIOT) | COO | Sell | 21,966 | $526,305 |
| 2026-01-05 | Riot Platforms, Inc. (RIOT) | COO | Sell | 29,482 | $373,537 |
| 2026-01-05 | Riot Platforms, Inc. (RIOT) | COO | Buy | 197,316 | $0 |
| 2026-01-05 | Riot Platforms, Inc. (RIOT) | COO | Buy | 394,632 | $0 |
| 2025-10-10 | Riot Platforms, Inc. (RIOT) | COO | Sell | 20,345 | $229,288 |
| 2025-07-03 | Riot Platforms, Inc. (RIOT) | COO | Sell | 20,345 | $229,288 |
| 2025-07-03 | Riot Platforms, Inc. (RIOT) | COO | Buy | 221,827 | $0 |
| 2025-07-03 | Riot Platforms, Inc. (RIOT) | COO | Buy | 443,656 | $0 |
Source: SEC Form 4 filings · as of 2026-08-14