AMPX Form 144: Affiliate 10b5-1 Sales and RSU Release

AMPX submitted a Form 144 notice reporting proposed and recent sales of Common Stock by an affiliate, including planned sales under 10b5-1 and a release of restricted stock units.

Rhea-AI Filing Summary

AMPX submitted a Form 144 notice reporting proposed and recent sales of Common Stock by an affiliate, including planned sales under 10b5-1 and a release of restricted stock units. The filing lists multiple 10b5-1 sale transactions on 03/23/2026 and 04/01/2026

The excerpt shows 10b5-1 sales of 152,823, 65,046, 1,250,963, and 249,037 shares on the dates above with aggregate proceeds reported as currency amounts. It also records a release of 126,192 RSUs on 05/20/2026 tied to compensation.

Insights

Securities Counsel

Form 144 lists proposed sales and recent 10b5-1 transactions by an affiliate.

The notice documents planned and completed dispositions of Common Stock under trading arrangements identified as 10b5-1 and a compensation-related release of 126,192 restricted stock units on 05/20/2026. The filing records per-transaction share counts and proceeds in currency.

Court or regulatory outcomes are not mentioned; cash-flow treatment and purchaser identities are not stated in the excerpt. Subsequent SEC filings or broker confirmations would provide execution details and final proceeds.

Key Figures

10b5-1 sale (03/23/2026): 152,823 shares 10b5-1 sale (03/23/2026): 65,046 shares 10b5-1 sale (04/01/2026): 1,250,963 shares +3 more

6 metrics

10b5-1 sale (03/23/2026) 152,823 shares 10b5-1 Sales on 03/23/2026

10b5-1 sale (03/23/2026) 65,046 shares 10b5-1 Sales on 03/23/2026

10b5-1 sale (04/01/2026) 1,250,963 shares 10b5-1 Sales on 04/01/2026

10b5-1 sale (04/01/2026) 249,037 shares 10b5-1 Sales on 04/01/2026

RSUs released 126,192 shares Release of restricted stock units on 05/20/2026

Example proceeds (04/01/2026) $19,681,150.69 Proceeds reported adjacent to 1,250,963-share sale on 04/01/2026

Key Terms

10b5-1, restricted stock units, Form 144

3 terms

10b5-1 regulatory

"10b5-1 Sales for KANG SUN 1180 Page Ave."

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

restricted stock units financial

"Release of restricted stock units | Issuer | 126192 | 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.

FAQ

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

What does AMPX's Form 144 disclose about recent insider sales?

It discloses proposed and completed dispositions of Common Stock under 10b5-1 plans. The excerpt lists specific trades on 03/23/2026 and 04/01/2026 with per-trade share counts and reported dollar proceeds for each transaction.

How many shares were released as compensation for AMPX on May 20, 2026?

The filing records a release of 126,192 restricted stock units on 05/20/2026 described as compensation. The excerpt links that RSU release to the issuer rather than open-market sales.

Do the Form 144 entries show the exact cash proceeds for the sales?

Yes, each listed 10b5-1 transaction in the excerpt includes a currency amount adjacent to the share count. Examples include proceeds reported as 1,9681150.69 and other per-trade dollar figures in the same lines.

Does the Form 144 confirm whether trades were executed under a 10b5-1 plan?

The excerpt explicitly labels several sales as 10b5-1 Sales, indicating they were effected under pre-arranged trading plans. The filing text provides dates and share counts for those 10b5-1 transactions.

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

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Accepted by SEC EDGAR 05/26/2026 - 07:19 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	0001476220
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	KANG SUN
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	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 1 New York Plaza, 38th fl. New York NY 10004	67796	1002594.37	145444412	05/21/2026	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	05/20/2026	Release of restricted stock units	Issuer			126192	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
10b5-1 Sales for KANG SUN 1180 Page Ave. Fremont CA 94538	Common	03/23/2026	152823	2855696.42
10b5-1 Sales for KANG SUN 1180 Page Ave. Fremont CA 94538	Common	03/23/2026	65046	1239705.21
10b5-1 Sales for KANG SUN 1180 Page Ave. Fremont CA 94538	Common	04/01/2026	1250963	19681150.69
10b5-1 Sales for KANG SUN 1180 Page Ave. Fremont CA 94538	Common	04/01/2026	249037	4179563.07

144: Remarks and Signature

Remarks	SHARES TO BE SOLD TO COVER WITHHOLDING TAXES UPON VESTING OF RESTRICTED STOCK UNIT AWARDS
Date of Notice	05/26/2026
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/ Kang Sun
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)