Insider Stefan Ionel plans 717,307 Amprius (NYSE: AMPX) share sale

Rhea-AI Filing Summary

Amprius Technologies insider plans sizable stock sale. A Form 144 filing indicates that Stefan Constantin Ionel intends to sell 717,307 shares of AMPX common stock through Morgan Stanley Smith Barney LLC on the NYSE, with an approximate market value of $8,012,319.19. The filing notes that 130,483,838 shares of the company’s common stock are outstanding.

The shares to be sold were acquired on 01/21/2026 through the cash exercise of stock options for the same 717,307-share amount. The form also reports prior sales over the past three months, including 125,000 and 73,255 shares sold on 12/11/2025 for gross proceeds of $1,313,575.00 and $769,807.49, and 25,024 shares sold on 11/21/2025 for $252,274.45. The filing includes a representation that the seller is not aware of undisclosed material adverse information about the issuer’s operations.

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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	717307	8012319.19	130483838	01/21/2026	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	01/21/2026	Exercise of Stock Options	Issuer			717307	01/21/2026	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
10b5-1 Sales for STEFAN CONSTANTIN IONEL 1180 Page Avenue Fremont CA 94538	Common	12/11/2025	125000	1313575.00
10b5-1 Sales for STEFAN CONSTANTIN IONEL 1180 Page Avenue Fremont CA 94538	Common	12/11/2025	73255	769807.49
Stefan Constantin Ionel 1180 Page Avenue Fremont CA 94538	Common	11/21/2025	25024	252274.45

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the AMPX Form 144 filing by Stefan Constantin Ionel report?

The Form 144 reports that Stefan Constantin Ionel plans to sell 717,307 shares of Amprius Technologies (AMPX) common stock on the NYSE through Morgan Stanley Smith Barney LLC, with an approximate market value of $8,012,319.19.

How were the 717,307 AMPX shares being sold acquired?

The 717,307 AMPX common shares were acquired on 01/21/2026 through an exercise of stock options from the issuer, with the purchase price paid in cash on the same date.

How many Amprius Technologies (AMPX) shares are outstanding according to this Form 144?

The filing states that there are 130,483,838 AMPX common shares outstanding, providing context for the size of the planned 717,307-share sale.

What AMPX stock sales has Stefan Constantin Ionel made in the past 3 months?

Over the past 3 months, sales disclosed include 125,000 shares for $1,313,575.00 and 73,255 shares for $769,807.49 on 12/11/2025, and 25,024 shares for $252,274.45 on 11/21/2025.

Are the recent AMPX sales by Stefan Constantin Ionel under a Rule 10b5-1 plan?

The table of recent activity identifies the 12/11/2025 transactions as "10b5-1 Sales for STEFAN CONSTANTIN IONEL", indicating they were conducted under a Rule 10b5-1 trading plan, while the 11/21/2025 sale is listed under his name without that label.

What representation does the seller make in the AMPX Form 144?

By signing the notice, the seller represents that they do not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed, consistent with the Form 144 instructions.