AMPX insider files to sell 270,251 shares

AMPX insider reported a proposed sale of 270,251 shares of Common stock on 03/12/2026.

Rhea-AI Filing Summary

AMPX insider reported a proposed sale of 270,251 shares of Common stock on 03/12/2026. The filing lists the sale as resulting from an exercise of options under a registered plan for cash.

The filing also lists restricted stock vesting events of 17,895 shares (vested 06/09/2024) and 125,000 shares (vested 06/07/2025) as context for the position change.

Insights

Equity Compensation Specialist

Exercise-and-resale pattern tied to registered plan; proceeds described as cash.

The filing shows an exercise of options under a registered plan generating 270,251 Common shares slated for sale on 03/12/2026. This sequence is typical when vested option exercises are monetized.

Vesting events of 17,895 (06/09/2024) and 125,000 (06/07/2025) are listed; these provide context about recently acquired or issuable shares. Cash‑flow treatment is stated as Cash.

FAQ

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

What does AMPX's Form 144 report show?

It reports a proposed sale of 270,251 shares of Common stock on 03/12/2026. The sale is tied to an exercise of options under a registered plan and is described as for cash.

Were there recent restricted stock vesting events for AMPX?

Yes. The filing lists vesting of 17,895 shares on 06/09/2024 and 125,000 shares on 06/07/2025. These entries appear as context for holdings around the reported transaction.

Does the Form 144 state how proceeds will be used?

No use-of-proceeds information is provided in the excerpt. The filing states the sale method as cash, without describing the recipient or any planned use of proceeds.

Is this Form 144 indicative of open‑market sales or plan‑driven activity?

The filing ties the transaction to an exercise of options under a registered plan, indicating plan‑driven activity. The record lists the sale as occurring on 03/12/2026 for cash.

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

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Accepted by SEC EDGAR 03/12/2026 - 05:04 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	0001835160
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	AMPRIUS TECHNOLOGIES, INC.
SEC File Number	001-41314
Address of Issuer	1180 Page Avenue Fremont CALIFORNIA 94538
Phone	(800) 425-8803
Name of Person for Whose Account the Securities are To Be Sold	WEN HSUAN HSIEH
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
Relationship to Issuer	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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	413146	7618412.24	137019004	03/12/2026	NYSE

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	03/12/2026	Exercise of options under a registered plan	Issuer			270251	03/12/2026	Cash
Common	06/09/2024	Restricted stock vesting under a registered plan	Issuer			17895	06/09/2024	Not Applicable
Common	06/07/2025	Restricted stock vesting under a registered plan	Issuer			125000	06/07/2025	Not Applicable

* 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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	03/12/2026
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/ Wen Hsieh
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)