Stephen Mitchell Howell Jr.

CIK: 0002025334

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (44.4%)

Compensation grants

Other (G, F, J, C, D, …)5 (55.6%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

RIOT

Riot Platforms, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (9 total)

RIOT
Riot Platforms, Inc.
Aug 12, 2026
Gift(G)
Direct
21.2K shares-
RIOT
Riot Platforms, Inc.
Jul 31, 2026
Tax Payment(F)
Direct
153.2K shares at avg. $20.17$3.1M
RIOT
Riot Platforms, Inc.
Jul 1, 2026
Tax Payment(F)
Direct
22K shares at avg. $23.96$526K
RIOT
Riot Platforms, Inc.
Jan 1, 2026
Tax Payment(F)
Direct
29.5K shares at avg. $12.67$374K
RIOT
Riot Platforms, Inc.
Jan 1, 2026
Award(A)
Direct
197.3K shares-
RIOT
Riot Platforms, Inc.
Jan 1, 2026
Award(A)
Direct
394.6K shares-
RIOT
Riot Platforms, Inc.
Jul 1, 2025
Tax Payment(F)
Direct
20.3K shares at avg. $11.27$229K
RIOT
Riot Platforms, Inc.
Jul 1, 2025
Award(A)
Direct
443.7K shares-
RIOT
Riot Platforms, Inc.
Jul 1, 2025
Award(A)
Direct
221.8K shares-

		Type	Shares	Price		Ownership
Aug 12, 2026	RIOT Riot Platforms, Inc.	Gift(G)	21,198	-	$0	Direct
Jul 31, 2026	RIOT Riot Platforms, Inc.	Tax Payment(F)	153,162	$20.17	$3,089,278	Direct
Jul 1, 2026	RIOT Riot Platforms, Inc.	Tax Payment(F)	21,966	$23.96	$526,305	Direct
Jan 1, 2026	RIOT Riot Platforms, Inc.	Tax Payment(F)	29,482	$12.67	$373,537	Direct
Jan 1, 2026	RIOT Riot Platforms, Inc.	Award(A)	197,316	-	$0	Direct
Jan 1, 2026	RIOT Riot Platforms, Inc.	Award(A)	394,632	-	$0	Direct
Jul 1, 2025	RIOT Riot Platforms, Inc.	Tax Payment(F)	20,345	$11.27	$229,288	Direct
Jul 1, 2025	RIOT Riot Platforms, Inc.	Award(A)	443,656	-	-	Direct
Jul 1, 2025	RIOT Riot Platforms, Inc.	Award(A)	221,827	-	-	Direct

1-9 of 9 transactions

About Howell Stephen Mitchell Jr.

Howell Stephen Mitchell Jr. (SEC CIK 0002025334) files insider reports with the SEC as COO of Riot Platforms, Inc. (RIOT).

Signal8 holds 6 ownership filings by Howell Stephen Mitchell Jr., all Form 4s, filed between Jul 3, 2025 and Aug 14, 2026. Those filings report 9 transactions, from Jul 1, 2025 to Aug 12, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Howell Stephen Mitchell Jr.'s filings is in CASTLE ROCK, CO.

Recent filings by Howell Stephen Mitchell Jr.

Aug 12, 2026: Gift of RIOT shares (Form 4, code G).
Jul 31, 2026: Tax withholding of RIOT shares (Form 4, code F).
Jul 1, 2026: Tax withholding of RIOT shares (Form 4, code F).
Jan 1, 2026: Tax withholding of RIOT shares (Form 4, code F).
Jan 1, 2026: Grants or awards of RIOT shares (2 lines, Form 4, code A).

Other insiders filing for Riot Platforms, Inc. (RIOT)

How to read Form 4 transaction codes