Insider to sell 1,018,875 AMPX shares in plan filing (NYSE: AMPX stock)

Rhea-AI Filing Summary

A shareholder filed a Form 144 to sell 1,018,875 common shares on the NYSE, showing an aggregate market value of $10,341,581.25. The shares are to be sold through Morgan Stanley Smith Barney LLC, with an approximate sale date of 01/16/2026, and the filing notes that 130,483,838 shares of the issuer’s stock are outstanding.

The securities to be sold were acquired on 01/16/2026 via the exercise of stock options from the issuer, paid in cash. Over the past three months, the same account reported additional common stock sales, including 1,000,000 shares sold on 11/17/2025 for $10,595,300.00 and 506,267 shares sold on 01/12/2026 for $5,111,474.14, some under a Rule 10b5-1 trading plan.

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

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	1018875	10341581.25	130483838	01/16/2026	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	01/16/2026	Exercise of Stock Options	Issuer			1018875	01/16/2026	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 KANG SUN 1180 Page Avenue Fremont CA 94538	Common	01/12/2026	506267	5111474.14
KANG SUN 1180 Page Avenue Fremont CA 94538	Common	11/21/2025	68655	692131.65
10b5-1 Sales for KANG SUN 1180 Page Avenue Fremont CA 94538	Common	11/17/2025	1000000	10595300.00

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 report?

The Form 144 reports a shareholder’s intent to sell 1,018,875 common shares of AMPX on the NYSE, with an aggregate market value of $10,341,581.25, through Morgan Stanley Smith Barney LLC.

How many AMPX shares are planned to be sold under this Form 144?

The filing states that 1,018,875 common shares are planned to be sold, with an approximate sale date of 01/16/2026.

How were the AMPX shares in this Form 144 acquired?

The shares were acquired on 01/16/2026 through the exercise of stock options from the issuer, and the payment method is listed as cash.

What does the Form 144 say about AMPX shares outstanding?

The Form 144 lists 130,483,838 common shares of the issuer as outstanding at the time of the filing.

What recent AMPX stock sales are disclosed for this shareholder?

Over the past three months, disclosed sales include 1,000,000 common shares sold on 11/17/2025 for $10,595,300.00 and 506,267 shares sold on 01/12/2026 for $5,111,474.14, with some transactions labeled as 10b5-1 sales.

What is the role of Rule 10b5-1 in the AMPX Form 144 filing?

The filing references 10b5-1 sales for the named seller and includes a representation that the person does not know of any material adverse information about the issuer that has not been publicly disclosed.