Riot Platforms COO covers taxes with 21,966 shares

Riot Platforms, Inc. COO Stephen Mitchell Howell Jr. reported a routine tax-related share disposition.

Rhea-AI Filing Summary

Riot Platforms, Inc. COO Stephen Mitchell Howell Jr. reported a routine tax-related share disposition. On July 1, 2026, 21,966 shares of common stock were withheld by the company to cover tax obligations tied to vesting of restricted shares, at $23.96 per share. After this withholding, he directly holds 2,008,768 shares of Riot Platforms common stock, indicating this was a compensation and tax event rather than an open-market sale.

Insider Trade Summary

Exercise Price or Tax Liability: 21,966 shares

Exercise Price or Tax Liability 1 txn

Insider Howell Stephen Mitchell Jr.

Role COO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	21,966	$23.96	$526K

Holdings After Transaction: Common Stock — 2,008,768 shares (Direct)

Footnotes (1)

1. F1. Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of restricted shares of the Issuer's common stock.

Key Figures

Shares withheld for taxes: 21,966 shares Withholding reference price: $23.96 per share Shares held after transaction: 2,008,768 shares

3 metrics

Shares withheld for taxes 21,966 shares Withheld to cover tax obligations on vested restricted shares

Withholding reference price $23.96 per share Value used for tax-withholding share calculation

Shares held after transaction 2,008,768 shares Direct common stock holdings after tax-withholding disposition

Key Terms

tax withholding obligations, restricted shares, Form 4

3 terms

tax withholding obligations financial

"Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting"

restricted shares financial

"tax withholding obligations upon vesting of restricted shares of the Issuer's common stock"

Restricted shares are company stock that cannot be sold or transferred immediately because they are subject to legal or contractual limits, such as a required holding period or performance conditions. They matter to investors because these locked-up shares can affect a company’s available stock for trading, future dilution, and insider incentives—imagine a gift that can’t be cashed until certain conditions are met, which changes when and how much supply can suddenly enter the market.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Riot Platforms (RIOT) report for its COO?

Riot Platforms reported that COO Stephen Mitchell Howell Jr. had 21,966 common shares withheld to cover tax obligations on vested restricted stock. This is a compensation-related event, not an open-market trade, and he continues to hold over two million shares afterward.

Was the Riot Platforms (RIOT) COO buying or selling shares in this Form 4?

The Form 4 shows a tax-withholding disposition, not a regular sale or purchase. Shares were withheld by the issuer to pay taxes on vested restricted stock, which is a standard administrative step in equity compensation programs.

How many Riot Platforms (RIOT) shares were withheld for the COO’s taxes?

A total of 21,966 shares of Riot Platforms common stock were withheld. The filing states this covered tax withholding obligations arising when restricted shares vested, using a price of $23.96 per share to determine the value withheld.

How many Riot Platforms (RIOT) shares does the COO hold after this transaction?

Following the tax withholding event, COO Stephen Mitchell Howell Jr. directly holds 2,008,768 shares of Riot Platforms common stock. This post-transaction holding figure comes directly from the Form 4 and indicates a substantial remaining equity stake.

Does this Riot Platforms (RIOT) Form 4 indicate a change in insider sentiment?

The transaction reflects shares withheld for tax obligations on vested restricted stock, not a discretionary market sale. Such tax-withholding dispositions are typically mechanical and compensation-related, so they usually provide limited insight into an insider’s view of the company’s prospects.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/06/2026 - 05:00 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Howell Stephen Mitchell Jr.

(Last) (First) (Middle)

C/O RIOT PLATFORMS, INC.

85 RIO GRANDE DRIVE, SUITE 200

(Street)

CASTLE ROCK COLORADO 80104

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Riot Platforms, Inc. [ RIOT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	COO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/01/2026		F		21,966(1)	D	$23.96	2,008,768	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares withheld by the Issuer to cover tax withholding obligations upon vesting of restricted shares of the Issuer's common stock.

	/s/ Tanya McGill, Attorney-in-Fact for Stephen Howell	07/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)