AMPX Form 144: 10b5‑1 Sales, RSU Release

AMPX filing: Notice of proposed sales of Common Stock reported on Form 144.

Rhea-AI Filing Summary

AMPX filing: Notice of proposed sales of Common Stock reported on Form 144. The filing lists broker information for Morgan Stanley Smith Barney LLC and records a release of restricted stock units dated 05/20/2026. It also itemizes multiple 10b5-1 sales attributed to KANG SUN on 03/23/2026, 04/01/2026, and 05/21/2026, with per‑trade share counts and gross proceeds shown in the excerpt.

Insights

Equity Capital Markets Analyst

Form 144 lists brokered resale activity and RSU release for AMPX.

The excerpt shows 10b5-1 sales by an individual, KANG SUN, with explicit trade dates, share counts, and gross dollar amounts. The broker is identified as Morgan Stanley Smith Barney LLC at 1 New York Plaza.

Cash‑flow treatment and whether these sales correspond to a single aggregated registration are not stated in the excerpt; subsequent filings or transaction confirmations would clarify proceeds recipients and any registration details.

Corporate Governance Specialist

The filing documents routine dispositions under a prearranged plan and a compensation-related RSU release.

The entry notes a release of restricted stock units on 05/20/2026 labeled as "Compensation." Multiple rows explicitly label transactions as 10b5-1 Sales, indicating preplanned open‑market dispositions.

Investors seeking full ownership impact should consult filings that state total post‑transaction holdings or the corresponding Form 4/5 entries; timing and net receipts are not provided here.

Key Figures

RSU release date: 05/20/2026 03/23/2026 sale - shares: 152,823 shares 03/23/2026 sale - proceeds: $2,855,696.42 +4 more

7 metrics

RSU release date 05/20/2026 Release of restricted stock units labeled Compensation

03/23/2026 sale - shares 152,823 shares 10b5-1 sale by KANG SUN on 03/23/2026

03/23/2026 sale - proceeds $2,855,696.42 Gross proceeds shown for 152,823 shares on 03/23/2026

04/01/2026 large sale - shares 1,250,963 shares 10b5-1 sale by KANG SUN on 04/01/2026

04/01/2026 large sale - proceeds $19,681,150.69 Gross proceeds shown for 1,250,963 shares on 04/01/2026

05/21/2026 sale - shares 67,796 shares 10b5-1 sale by KANG SUN on 05/21/2026

05/21/2026 sale - proceeds $1,002,594.37 Gross proceeds shown for 67,796 shares on 05/21/2026

Key Terms

10b5-1 Sales, restricted stock units, Form 144

3 terms

10b5-1 Sales regulatory

"10b5-1 Sales for KANG SUN 1180 Page Ave. Fremont CA 94538"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

restricted stock units financial

"Release of restricted stock units | Issuer | 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 transactions?

The Form 144 lists a release of restricted stock units on 05/20/2026 and multiple 10b5-1 sales by KANG SUN with dates and amounts shown, indicating planned dispositions under a trading arrangement.

Who is the broker handling the reported sales in the AMPX filing?

The filing names Morgan Stanley Smith Barney LLC at 1 New York Plaza, New York, NY as the broker referenced in the excerpt, including an NYSE listing context in the same section.

How many shares and proceeds are shown for the 03/23/2026 10b5-1 sale?

The excerpt shows two 03/23/2026 entries: 152,823 shares for $2,855,696.42 and 65,046 shares for $1,239,705.21, each labeled as 10b5-1 sales for KANG SUN.

What 10b5-1 sale volumes are listed for 04/01/2026 in the filing?

The filing lists 1,250,963 shares for $19,681,150.69 and 249,037 shares for $4,179,563.07 on 04/01/2026, both identified as 10b5-1 sales attributed to KANG SUN.

Does the excerpt state who receives proceeds from the reported sales?

The excerpt does not state the cash‑flow recipient verbatim; transactions are labeled as 10b5-1 Sales and the RSU entry is labeled Issuer and Compensation, but payee details are not shown in this excerpt.

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

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Accepted by SEC EDGAR 05/28/2026 - 06:23 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	356	6120.89	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			781	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
10b5-1 Sales for KANG SUN 1180 Page Ave. Fremont CA 94538	Common	05/21/2026	67796	1002594.37

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