Form 144: Constantin Stefan reports RSU release

Constantin Ionel Stefan submitted a Form 144 reporting a proposed sale related to a release of 6,875 restricted stock units dated 05/20/2026.

Rhea-AI Filing Summary

Constantin Ionel Stefan submitted a Form 144 reporting a proposed sale related to a release of 6,875 restricted stock units dated 05/20/2026. The filing also records 28,812 shares sold during the prior three months on 05/21/2026 for $426,083.38. Morgan Stanley Smith Barney LLC is listed as the broker.

Insights

Securities Counsel

Form 144 notifies the market of a planned resale tied to vested compensation.

Form 144 lists a release of 6,875 restricted stock units dated 05/20/2026, which is the operative event permitting a resale under resale rules for affiliates. The filing names Morgan Stanley Smith Barney LLC as the broker handling transactions.

Past transactions include 28,812 shares sold on 05/21/2026 for $426,083.38. Timing and further sale mechanics are not detailed in the excerpt; subsequent filings would show completed resale activity.

Key Figures

RSU release: 6,875 shares Shares sold (past 3 months): 28,812 shares Proceeds recorded: $426,083.38 +1 more

4 metrics

RSU release 6,875 shares release dated <date>05/20/2026</date>

Shares sold (past 3 months) 28,812 shares sale dated <date>05/21/2026</date>

Proceeds recorded $426,083.38 proceeds for 28,812-share transaction on <date>05/21/2026</date>

Filing date listed 05/27/2026 form header date

Key Terms

restricted stock units, Form 144, compensation

3 terms

restricted stock units financial

"Release of restricted stock units | Issuer | 6875 | 05/20/2026"

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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

compensation financial

"Release of restricted stock units | Compensation"

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

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Accepted by SEC EDGAR 05/28/2026 - 06:11 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	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	Constantin Ionel Stefan
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 1 New York Plaza, 38th fl. New York NY 10004	3208	55156.75	145444412	05/27/2026	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	05/20/2026	Release of restricted stock units	Issuer			6875	05/20/2026	Compensation

* 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
Constantin Ionel Stefan 1180 Page Avenue Fremont CA 94538	Common Stock	05/21/2026	28812	426083.38

144: Remarks and Signature

Remarks	SHARES TO BE SOLD TO COVER WITHHOLDING TAXES UPON VESTING OF RESTRICTED STOCK UNIT AWARDS
Date of Notice	05/28/2026
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/Constantin Ionel Stefan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)