Guardant Health officer plans $6.3M stock sale

Guardant Health, Inc. (GH) received a Rule 144 notice relating to proposed sales of its common stock for the account of officer AmirAli Talasaz.

Rhea-AI Filing Summary

Guardant Health, Inc. (GH) received a Rule 144 notice relating to proposed sales of its common stock for the account of officer AmirAli Talasaz. The notice covers up to 37,500 shares, described as founder shares acquired from the issuer on September 22, 2018, with sales to be effected through Stifel Nicolaus & Company Inc. The filing also lists prior sales of Guardant Health common stock by AmirAli Talasaz over the past three months.

Key Figures

Shares to be sold under current notice: 37,500 shares of Common Stock Aggregate market value of shares to be sold: $6,343,384.00 Shares outstanding: 134,196,170 shares +4 more

7 metrics

Shares to be sold under current notice 37,500 shares of Common Stock Proposed sale by AmirAli Talasaz under Rule 144

Aggregate market value of shares to be sold $6,343,384.00 Value for 37,500 Guardant Health common shares in current notice

Shares outstanding 134,196,170 shares Guardant Health common stock referenced in Rule 144 section

Shares sold on 06/26/2026 116,972 shares Guardant Health common stock sold by AmirAli Talasaz in past 3 months

Proceeds on 06/26/2026 sale $17,638,465.00 Sale of 116,972 Guardant Health shares

Shares sold on 06/29/2026 143,028 shares Guardant Health common stock sold by AmirAli Talasaz in past 3 months

Proceeds on 06/29/2026 sale $21,674,191.00 Sale of 143,028 Guardant Health shares

Key Terms

Rule 144, founder shares, aggregate market value, attorney-in-fact

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.

founder shares financial

"Common Stock | 09/22/2018 | Founder Shares | Issuer"

Founder shares are the ownership stakes given to the people who start a company, often with extra voting power or protections compared with ordinary shares. For investors, they matter because founders’ control and incentives influence decisions about strategy, hiring, and whether the company sells or stays independent — like a family that keeps majority voting rights in a household decision. High founder ownership can mean stable leadership but also a risk that outside shareholders have less influence.

aggregate market value financial

"Common Stock | Stifel Nicolaus & Company Inc ... | 6343384.00"

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.

attorney-in-fact regulatory

"as a duly authorized representative of STIFEL, as attorney-in-fact for AmirAli Talasaz"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

What does the Form 144 filing for GH disclose about AmirAli Talasaz’s planned sales?

The Form 144 indicates that AmirAli Talasaz, an officer of Guardant Health (GH), has notified of a proposed sale of up to 37,500 shares of Guardant Health common stock, with the shares to be sold as founder shares acquired from the issuer on September 22, 2018.

How many GH shares are covered by the current Form 144 notice?

The current notice covers up to 37,500 shares of Guardant Health common stock. These are listed as founder shares to be sold through Stifel Nicolaus & Company Inc. on Nasdaq, with an aggregate market value shown as $6,343,384.00.

What prior GH share sales by AmirAli Talasaz are reported in the last 3 months?

The filing reports two prior sales of Guardant Health common stock: 116,972 shares on June 26, 2026 for $17,638,465.00, and 143,028 shares on June 29, 2026 for $21,674,191.00. A remark states shares were sold out of The Talasaz Family Foundation.

What is the aggregate market value of the GH shares proposed to be sold under this Form 144?

The Form 144 lists an aggregate market value of $6,343,384.00 for the 37,500 shares of Guardant Health common stock covered by the current notice, with trading on Nasdaq indicated.

How many Guardant Health (GH) shares are outstanding as referenced in the Form 144?

The Form 144 references 134,196,170 shares of Guardant Health common stock as outstanding. This figure is provided in connection with the Rule 144 securities information section as context for the proposed sale.

Who is executing the planned sale of GH shares for AmirAli Talasaz?

The planned sale of up to 37,500 GH shares is to be executed through Stifel Nicolaus & Company Inc.. The Form 144 is signed by Brian Schneiweiss as a duly authorized representative of Stifel, as attorney-in-fact for AmirAli Talasaz.

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

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Available on EDGAR 08/21/2026 - 04:29 PM EDT Accepted by SEC EDGAR 08/21/2026 - 04:28 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	0001753159
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	Guardant Health, Inc.
SEC File Number	001-38683
Address of Issuer	3100 HANOVER STREET PALO ALTO CALIFORNIA 94304
Phone	855-698-8887
Name of Person for Whose Account the Securities are To Be Sold	Talasaz AmirAli
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

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	Stifel Nicolaus & Company Inc 501 N Broadway St. Louis MO 63102	37500	6343384.00	134196170	08/21/2026	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 Stock	09/22/2018	Founder Shares	Issuer			37500	09/22/2018	Founder Shares

* 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
AmirAli Talasaz 3100 HANOVER STREET PALO ALTO CA 94304	Common Stock	06/26/2026	116972	17638465.00
AmirAli Talasaz 3100 HANOVER STREET PALO ALTO CA 94304	Common Stock	06/29/2026	143028	21674191.00

144: Remarks and Signature

Remarks	Shares were sold out of The Talasaz Family Foundation
Date of Notice	08/21/2026
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/ Brian Schneiweiss, as a duly authorized representative of STIFEL, as attorney-in-fact for AmirAli Talasaz
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)