Madrigal’s Sibold plans $2.8M stock sale

Form 144 shows MDGL’s CEO William Sibold planning additional stock sales under a pre-set Rule 10b5-1 trading plan, following recent sizable sales.

Rhea-AI Filing Summary

Madrigal Pharmaceuticals, Inc. (MDGL) received a Form 144 notice indicating that William Sibold plans to sell 5,221 shares of common stock through Morgan Stanley Smith Barney LLC on or after September 11, 2026, with an indicated aggregate market value of $2,783,419.52.

The shares relate to Restricted Stock Units acquired on September 8, 2025. The notice also reports prior sales in the last three months totaling 6,362 shares for $3,407,397.50 on September 9, 2026 and 2,500 shares for $1,368,253.45 on July 20, 2026, executed under a Rule 10b5-1 trading plan adopted on June 5, 2026.

Key Figures

Planned shares to be sold: 5,221 shares Planned aggregate market value: $2,783,419.52 Shares sold on September 9, 2026: 6,362 shares +5 more

8 metrics

Planned shares to be sold 5,221 shares Common stock planned for sale under Form 144

Planned aggregate market value $2,783,419.52 Aggregate market value of the 5,221 shares referenced in the notice

Shares sold on September 9, 2026 6,362 shares Common stock sold in the past three months

Aggregate proceeds September 9, 2026 sale $3,407,397.50 Aggregate sale price for 6,362 shares

Shares sold on July 20, 2026 2,500 shares Common stock sold in the past three months

Aggregate proceeds July 20, 2026 sale $1,368,253.45 Aggregate sale price for 2,500 shares

Shares outstanding of class referenced 23,104,126 shares Number of shares outstanding of the class listed in the Form 144

Rule 10b5-1 plan adoption date June 5, 2026 Date Sibold’s Rule 10b5-1 trading plan was adopted

Key Terms

Rule 144, Restricted Stock Units, Rule 10b5-1 trading plan, aggregate market value

4 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 Units financial

"Common | 09/08/2025 | Restricted Stock Units | Issuer"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Rule 10b5-1 trading plan regulatory

"The reported sales occur automatically pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

aggregate market value financial

"Common ... 5221 | 2783419.52 | 23104126"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

What does the Form 144 filing disclose for MDGL?

The Form 144 discloses that William Sibold plans to sell 5,221 shares of Madrigal Pharmaceuticals common stock, with an indicated aggregate market value of $2,783,419.52, through Morgan Stanley Smith Barney LLC pursuant to Rule 144.

How many MDGL shares has William Sibold sold in the past three months?

Over the past three months, William Sibold reported sales of 6,362 shares of MDGL common stock for $3,407,397.50 on September 9, 2026, and 2,500 shares for $1,368,253.45 on July 20, 2026.

Are William Sibold’s MDGL stock sales under a Rule 10b5-1 plan?

Yes. The Form 144 states the reported sales occur automatically pursuant to a Rule 10b5-1 trading plan adopted by William Sibold on June 5, 2026, which schedules trades in advance under predefined terms.

What type of MDGL securities are covered by this Form 144?

The notice covers common stock of Madrigal Pharmaceuticals, Inc., related to Restricted Stock Units that were acquired on September 8, 2025 and are being sold pursuant to Rule 144.

Which broker is handling the planned MDGL share sale?

The filing lists Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza in New York, as the broker handling the planned sale of 5,221 shares of MDGL common stock.

On which market are the MDGL shares referenced in this Form 144 listed?

The Form 144 identifies the market for the Madrigal Pharmaceuticals common stock involved in these transactions as NASDAQ.

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

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Available on EDGAR 09/11/2026 - 04:33 PM Accepted by SEC EDGAR 09/11/2026 - 04:33 PM 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	2678242827
Name of Person for Whose Account the Securities are To Be Sold	WILLIAM 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	Director
Relationship to Issuer	Officer

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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	5221	2783419.52	23104126	09/11/2026	NASDAQ

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	09/08/2025	Restricted Stock Units	Issuer			5221	09/08/2025	N/A

* 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 SIBOLD 1001 Conshohocken State Road Suite 2-350 West Conshohocken PA 19428	Common	09/09/2026	6362	3407397.50
WILLIAM SIBOLD 1001 Conshohocken State Road Suite 2-350 West Conshohocken PA 19428	Common	07/20/2026	2500	1368253.45

144: Remarks and Signature

Remarks	The reported sales occur automatically pursuant to a Rule 10b5-1 trading plan adopted by William Sibold on 06/05/2026.
Date of Notice	09/11/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/05/2026
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)