person · Reporting owner
Howell Stephen Mitchell Jr.
Disclosed activity across 1 company
Sign in to followReported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| Riot Platforms, Inc.RIOT · Entity 3724 | COO | August 12, 2026 | August 14, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
Riot Platforms, Inc.
Report date August 12, 2026 · Filed August 14, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | Direct | 1,834,408 |
Reported balance
After 2026-08-12 transaction · row 1
1 source rowRow 1 · 2026-08-12 · Gift · Disposed 21,198 · Balance 1,834,408 F1: Represents shares of Common Stock gifted by the Reporting Person to a charitable donor advised fund. |
Filing footnotes · ownership attribution and instrument terms
F1: Represents shares of Common Stock gifted by the Reporting Person to a charitable donor advised fund.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| August 12, 2026 Filed Aug 14, 2026 21:06 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | GiftCommon Stock | 21,198 | $0.00 | $0.00 |
DisclosureSEC source: 0002025334-26-000010 · form4-08142026_090854.xml · nonDerivative · entry 1 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,834,408 F1 · shares: Represents shares of Common Stock gifted by the Reporting Person to a charitable donor advised fund. Read SEC document |
| July 31, 2026 Filed Aug 5, 2026 00:00 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | Tax withholdingCommon Stock | 153,162 | $20.17 | $3,089,277.54 |
DisclosureSEC source: 0002025334-26-000008 · form4-08042026_080814.xml · nonDerivative · entry 1 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,855,606 F1 · shares: Represents shares withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of performance-based restricted stock previously granted to the Reporting Person under the Issuer's Long-Term Incentive Program. The vesting of such shares was subject to the Issuer's achievement of certain performance objectives. Read SEC document |
| July 01, 2026 Filed Jul 6, 2026 21:00 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | Tax withholdingCommon Stock | 21,966 | $23.96 | $526,305.36 |
DisclosureSEC source: 0002025334-26-000006 · form4-07062026_050701.xml · nonDerivative · entry 1 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 2,008,768 F1 · shares: Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of restricted shares of the Issuer's common stock. Read SEC document |
| January 01, 2026 Filed Jan 5, 2026 23:00 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | GrantCommon Stock | 394,632 | $0.00 | $0.00 |
DisclosureSEC source: 0002025334-26-000002 · form4-01052026_060107.xml · nonDerivative · entry 3 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 2,030,734 F3 · shares: Represents an award of performance-based restricted shares under the LTIP at the maximum achievable amount of up to 200% of the award target amount of 197,316 shares. Such shares are eligible to vest, if at all, at the end of the three-year performance period from January 1, 2026 through December 31, 2028, upon certification by the Compensation and Human Resources Committee, and subject to the Reporting Persons continued service with the Issuer through January 1, 2029. Read SEC document |
| January 01, 2026 Filed Jan 5, 2026 23:00 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | GrantCommon Stock | 197,316 | $0.00 | $0.00 |
DisclosureSEC source: 0002025334-26-000002 · form4-01052026_060107.xml · nonDerivative · entry 2 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,636,102 F2 · shares: Represents the award of service-based restricted shares under the Issuer's Long-Term Incentive Program ("LTIP"). These shares are eligible to vest, if at all, in three approximately equal tranches as of January 1, 2027, January 1, 2028, and January 1, 2029, subject to the Reporting Person's continued service with the Issuer through each applicable vesting date. Read SEC document |
| January 01, 2026 Filed Jan 5, 2026 23:00 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | Tax withholdingCommon Stock | 29,482 | $12.67 | $373,536.94 |
DisclosureSEC source: 0002025334-26-000002 · form4-01052026_060107.xml · nonDerivative · entry 1 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,438,786 F1 · shares: Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of restricted shares of the Issuer's common stock. Read SEC document |
| July 01, 2025 Filed Jul 3, 2025 20:30 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | GrantCommon Stock | 443,656 | $0.00 | $0.00 |
DisclosureSEC source: 0001415889-25-019331 · form4-07032025_040711.xml · nonDerivative · entry 3 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,468,268 F3 · shares: Represents an award of performance-based restricted shares under the LTIP at the maximum achievable amount of up to 200% of the award target amount of 221,827 shares. Such shares are eligible to vest, if at all, at the end of the three-year performance period from January 1, 2025 through December 31, 2027, upon certification by the Compensation and Human Resources Committee, and subject to the Reporting Persons continued service with the Issuer through January 1, 2028. Read SEC document |
| July 01, 2025 Filed Jul 3, 2025 20:30 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | GrantCommon Stock | 221,827 | $0.00 | $0.00 |
DisclosureSEC source: 0001415889-25-019331 · form4-07032025_040711.xml · nonDerivative · entry 2 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,024,612 F2 · shares: Represents the award of service-based restricted shares under the Issuer's Long-Term Incentive Program ("LTIP"). These shares are eligible to vest, if at all, in three approximately equal tranches as of January 1, 2026, January 1, 2027, and January 1, 2028, subject to the Reporting Person's continued service with the Issuer through each applicable vesting date. Read SEC document |
| July 01, 2025 Filed Jul 3, 2025 20:30 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | Tax withholdingCommon Stock | 20,345 | $11.27 | $229,288.15 |
DisclosureSEC source: 0001415889-25-019331 · form4-07032025_040711.xml · nonDerivative · entry 1 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 802,785 F1 · shares: Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of restricted shares of the Issuer's common stock. Read SEC document |
| July 01, 2025 Filed Oct 11, 2025 00:11 UTC Amendment | Riot Platforms, Inc. RIOT · Entity 3724 | Tax withholdingCommon Stock | 20,345 | $11.27 | $229,288.15 |
DisclosureSEC source: 0002025334-25-000003 · form4a-10112025_121058.xml · nonDerivative · entry 1 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 802,785 F1 · security: This Form 4 amendment is being filed solely to add the Power of Attorney, attached as Exhibit 24. F2 · shares: Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of restricted shares of the Issuer's common stock. Read SEC document |
| July 01, 2024 Filed Jul 4, 2024 01:30 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | GrantCommon Stock | 251,256 | $0.00 | $0.00 |
DisclosureSEC source: 0001415889-24-019302 · form4-07032024_090703.xml · nonDerivative · entry 3 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 823,130 F3 · shares: Represents the maximum achievable award of performance-based restricted shares of the Issuer's Common Stock, no par value per share, ("PRSAs") of up to a maximum of 200% of the target amount, which is 125,628 shares, during the three-year performance period from January 1, 2024 through December 31, 2026 (the "Performance Period"), granted to the Reporting Person, as authorized by the Committee under the LTIP, pursuant to an LTIP award agreement with the Issuer. These PRSAs are eligible to vest, if at all, based upon certification by the Committee of the Company's achievement, as of the end of the Performance Period, of certain performance objectives, and subject to the Reporting Persons continued service with the Issuer through July 1, 2027. Any unvested portion of the PRSAs shall be automatically forfeited and returned to the Issuer, without consideration therefore. Read SEC document |
| July 01, 2024 Filed Jul 4, 2024 01:30 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | GrantCommon Stock | 125,628 | $0.00 | $0.00 |
DisclosureSEC source: 0001415889-24-019302 · form4-07032024_090703.xml · nonDerivative · entry 2 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 571,874 F2 · shares: Represents the award of RSAs, granted to the Reporting Person, as authorized by the Issuer's Compensation and Human Resources Committee of its Board of Directors (the "Committee") under the Long-Term Incentive Program established, as of July 13, 2023, (the "LTIP"), pursuant to an LTIP award agreement with the Issuer. These shares are eligible to vest, if at all, in three approximately equal annual tranches as of July 1, 2025, July 1, 2026, and July 1, 2027, subject to the Reporting Person's continued service with the Issuer through the applicable vesting dates. Any unvested portion of the RSAs shall be automatically forfeited and returned to the Issuer, without consideration therefore. Read SEC document |
| July 01, 2024 Filed Jul 4, 2024 01:30 UTC | Riot Platforms, Inc. RIOT · Entity 3724 | Tax withholdingCommon Stock | 3,188 | $9.95 | $31,720.60 |
DisclosureSEC source: 0001415889-24-019302 · form4-07032024_090703.xml · nonDerivative · entry 1 Howell Stephen Mitchell Jr. · CIK 0002025334 · COO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 446,246 F1 · shares: Shares surrendered to the Issuer, in accordance with Rule 16b-3 under the Exchange Act, to cover tax liabilities incident to the vesting of 8,214 restricted shares of the Issuer's Common Stock previously issued to the Reporting Person as service-based restricted stock awards ("RSAs") granted under the Issuer's 2019 Equity Incentive Plan, as previously reported on Form 3. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.