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  4. [144] Amprius Technologies, Inc. SEC Filing

Amprius Technologies (AMPX) director plans tax-driven share sale

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
144

Rhea-AI Filing Summary

Amprius Technologies, Inc. (AMPX) received a notice that director Kang Sun intends to sell company common stock under Rule 144. The planned sale relates to 126,974 shares expected from the release of restricted stock units on 08/20/2026, with the stated purpose of covering withholding taxes upon vesting.

Morgan Stanley Smith Barney LLC is listed as the broker. The notice also lists a prior Rule 10b5-1 sale of 356 shares of common stock on 05/27/2026 for $6,120.89 during the past three months.

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Planned shares to be sold 126,974 shares of common stock To be sold in connection with RSU release on 08/20/2026
RSU release date 08/20/2026 Date tied to restricted stock unit vesting and planned sale
Shares sold in past 3 months 356 shares of common stock Rule 10b5-1 sale on 05/27/2026
Proceeds from recent sale $6,120.89 Total for 356 shares sold on 05/27/2026
Issuer file number 001-41314 SEC file number for Amprius Technologies, Inc.
Date of notice 08/25/2026 Date the Rule 144 notice was signed by Kang Sun
Rule 144 regulatory
"See the definition of "person" in paragraph (a) of Rule 144."
Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.
restricted stock units financial
"Release of restricted stock units | Issuer | | | 126974"
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.
withholding taxes financial
"SHARES TO BE SOLD TO COVER WITHHOLDING TAXES UPON VESTING"
Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.
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.

FAQ

What insider transaction did AMPX disclose in this Form 144 filing?
The filing states that director Kang Sun intends to sell 126,974 shares of Amprius Technologies common stock in connection with the 08/20/2026 release of restricted stock units, primarily to cover withholding taxes upon vesting.

How many AMPX shares are planned to be sold to cover tax withholding?
The notice reports that 126,974 common shares of Amprius Technologies are expected to be sold in connection with the vesting of restricted stock unit awards, with the remark that the shares are to be sold to cover withholding taxes.

Which broker is handling the planned AMPX share sale for Kang Sun?
The filing lists Morgan Stanley Smith Barney LLC, located at 1 New York Plaza, New York, as the broker for the Amprius Technologies common stock associated with this Rule 144 notice.

Were there any AMPX shares sold by Kang Sun in the past three months?
Yes. The filing reports a Rule 10b5-1 sale of 356 Amprius Technologies common shares on 05/27/2026 for total proceeds of $6,120.89 during the past three months.

What is the stated reason for Kang Sun’s planned AMPX share sale?
The remarks section explains that the shares are to be sold to cover withholding taxes upon the vesting of restricted stock unit awards, linking the transaction to compensation-related tax obligations rather than a discretionary open-market sale.

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

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144: Filer Information

144: Issuer Information

144: Securities Information



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


* 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

144: Remarks and Signature

Source: View Original Filing on SEC EDGAR