Amprius Technologies insider plans sale of 198,255 common shares

A shareholder has filed to sell common stock under Rule 144.

Rhea-AI Filing Summary

A shareholder has filed to sell common stock under Rule 144. The notice covers a proposed sale of 198,255 common shares through Morgan Stanley Smith Barney LLC on the NYSE, with an aggregate market value of $2,188,735.20 and 130,483,838 shares of the class outstanding.

The shares to be sold come from recent and prior equity awards, including 125,000 shares acquired on December 11, 2025 through a stock option exercise for cash, 43,464 shares from restricted stock units granted on May 20, 2024, and 29,791 shares from stock options previously exercised on December 14, 2022. In the past three months, the seller, Stefan Constantin Ionel, already sold 25,024 common shares on November 21, 2025 for gross proceeds of $252,274.45.

FAQ

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

What does the AMPX Form 144 filing disclose?

The filing discloses that a shareholder intends to sell 198,255 common shares under Rule 144, with an aggregate market value of $2,188,735.20, on the NYSE.

Who is selling shares of AMPX and how many have they recently sold?

The seller is Stefan Constantin Ionel, who intends to sell 198,255 shares under this notice and previously sold 25,024 common shares on November 21, 2025 for $252,274.45 in gross proceeds.

How many AMPX shares are outstanding in the class being sold?

The class of common stock referenced in the notice has 130,483,838 shares outstanding.

How were the AMPX shares in this Form 144 acquired?

The shares were acquired through stock option exercises and restricted stock units, including 125,000 shares from an option exercise on December 11, 2025, 43,464 shares from restricted stock units on May 20, 2024, and 29,791 shares from stock options previously exercised on December 14, 2022.

Which broker and exchange are involved in the planned AMPX share sale?

The planned sale will be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, with trades on the NYSE.

What is Rule 144 and why is AMPX stock involved?

Rule 144 allows the public resale of restricted or control securities if certain conditions are met. This notice shows a shareholder’s intent to sell restricted or control common shares of the issuer on the open market.

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

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Accepted by SEC EDGAR 12/11/2025 - 04:28 PM EST 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	0001940928
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	8004258803
Name of Person for Whose Account the Securities are To Be Sold	Stefan Constantin Ionel
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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	198255	2188735.20	130483838	12/11/2025	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	12/11/2025	Exercise of Stock Options	Issuer			125000	12/11/2025	Cash
Common	05/20/2024	Restricted Stock Units	Issuer			43464	05/20/2024	N/A
Common	12/14/2022	Previously Exercised Stock Options	Issuer			29791	12/14/2022	Cash

* 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
Stefan Constantin Ionel 1180 Page Avenue Fremont CA 94538	Common	11/21/2025	25024	252274.45

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 5/20/2024 through 11/20/2024
Date of Notice	12/11/2025
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/11/2025
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/ Stefan Constantin Ionel
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)