Madrigal exec to sell $3.4M in shares for taxes

MDGL’s chief executive officer filed a Rule 144 notice for automatic, tax-related sales of vested RSU shares.

Rhea-AI Filing Summary

Madrigal Pharmaceuticals, Inc. (MDGL) disclosed a Rule 144 notice indicating that officer and director William John Sibold plans to sell 6,362 shares of common stock through Morgan Stanley Smith Barney LLC. The shares relate to vested Restricted Stock Units, and a prior sale of 2,500 shares occurred on July 20, 2026. The company states the sale covers tax withholding obligations tied to RSU vesting and was automatic, not at Sibold’s discretion.

Key Figures

Shares to be sold: 6,362 shares Aggregate market value of planned sale: $3,398,325.92 Shares outstanding: 23,104,126 shares +3 more

6 metrics

Shares to be sold 6,362 shares Planned sale of Madrigal common stock under Rule 144

Aggregate market value of planned sale $3,398,325.92 Value associated with 6,362 shares to be sold

Shares outstanding 23,104,126 shares Common stock outstanding as referenced in the notice

Recent prior sale 2,500 shares Common stock sold on July 20, 2026

Aggregate value of prior sale $1,368,250 Value for 2,500 shares sold on July 20, 2026

Date of notice September 9, 2026 Filing date for the Rule 144 notice

Key Terms

Rule 144, Restricted Stock Unit, tax withholding obligations

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Unit financial

"Restricted Stock Unit Grant | Issuer | | | 6362 | 09/08/2026"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

tax withholding obligations financial

"to cover certain tax withholding obligations in connection with the vesting"

FAQ

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

What insider transaction did MDGL disclose in this Form 144?

The company reported that officer and director William John Sibold filed a Rule 144 notice to sell 6,362 shares of Madrigal Pharmaceuticals common stock related to vested Restricted Stock Units.

Why is William John Sibold selling MDGL shares under Rule 144?

The filing states the reported sale represents shares sold by the issuer on his behalf to cover tax withholding obligations in connection with the vesting of previously granted Restricted Stock Units.

Was the MDGL insider sale discretionary by the executive?

No. The notice explains the sale was automatic and not at the discretion of William John Sibold, as it was made to satisfy tax withholding obligations from RSU vesting.

How many MDGL shares has William John Sibold sold recently?

The notice lists a planned sale of 6,362 shares of common stock and a prior sale of 2,500 shares on July 20, 2026, all in connection with RSU-related activity.

What was the aggregate market value and share count context in the MDGL Form 144?

The Form 144 shows an aggregate market value of $3,398,325.92 for the 6,362 shares to be sold and notes 23,104,126 shares of common stock outstanding as context.

Through which broker will the MDGL insider shares be sold and on what market?

The filing identifies Morgan Stanley Smith Barney LLC as the broker for the planned sale of MDGL common stock, with trading on the Nasdaq Stock Market.

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

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Available on EDGAR 09/09/2026 - 06:06 PM EDT Accepted by SEC EDGAR 09/09/2026 - 06:05 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001518611
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Madrigal Pharmaceuticals, Inc.
SEC File Number	001-33277
Address of Issuer	1001 Conshohocken State Road Suite 2-350 West Conshohocken PENNSYLVANIA 19428
Phone	267-824-2827
Name of Person for Whose Account the Securities are To Be Sold	William John Sibold
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer and Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza, 8th Floor New York NY 10004	6362	3398325.92	23104126	09/09/2026	Nasdaq Stock Market

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	09/08/2026	Restricted Stock Unit Grant	Issuer			6362	09/08/2026	Vesting of Restricted Stock Units

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
William John Sibold c/o Madrigal Pharmaceuticals, Inc. 1001 Conshohocken State Road Suite 2-350 West Conshohocken PA 19428	common stock	07/20/2026	2500	1368250

144: Remarks and Signature

Remarks	The sale reported herein represents the number of shares sold by the Issuer on behalf of the Reporting Person to cover certain tax withholding obligations in connection with the vesting of Restricted Stock Units previously granted to the Reporting Person. This sale was automatic and not at the discretion of the Reporting Person.
Date of Notice	09/09/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ William Sibold
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)