Proposed 1.5M-share sale; KANG SUN 10b5-1 activity (AMPX)

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Form 144 notifying the proposed sale of 1,500,000 shares of Common stock to be sold on 04/01/2026 pursuant to an exercise of stock options for cash. The filing also lists recent 10b5-1 dispositions by KANG SUN during Jan–Mar 2026, including sales of 950,548 and 506,267 shares on 01/16/2026 and 01/12/2026 respectively.

Insights

Insider Transactions Analyst

Notice of proposed sale after option exercise; recent 10b5-1 activity is substantial.

The filing documents a proposed sale of 1,500,000 shares tied to an exercise of stock options on 04/01/2026, which is a routine mechanism for converting option value to cash. Multiple prior 10b5-1 sales by KANG SUN are listed with specific dates and sizes.

Timing is explicit for the proposed sale; cash consideration is stated. Subsequent confirmations (settlement/trade reports) would show actual market activity and proceeds.

Securities Compliance Specialist

Form 144 is a regulatory notice, not a guarantee of execution; it records proposed transactions.

The notice lists the planned sale method as an exercise of stock options and identifies prior 10b5-1 sales by the reporting person. The presence of a 10b5-1 plan indicates prearranged trades for several prior dates.

Regulatory follow-up filings (e.g., trade confirmations or Form 4 amendments) will show completed transactions and final proceeds.

Key Figures

Proposed sale: 1,500,000 shares 10b5-1 sale (Mar 23, 2026): 217,869 shares 10b5-1 sale (Jan 16, 2026): 950,548 shares +3 more

6 metrics

Proposed sale 1,500,000 shares to be sold on 04/01/2026 via exercise of stock options

10b5-1 sale (Mar 23, 2026) 217,869 shares sale date 03/23/2026; proceeds listed as 4095414.31

10b5-1 sale (Jan 16, 2026) 950,548 shares sale date 01/16/2026; proceeds listed as 10518708.21

10b5-1 sale (Jan 12, 2026) 506,267 shares sale date 01/12/2026; proceeds listed as 5111474.14

10b5-1 sale (Feb 23, 2026) 61,251 shares sale date 02/23/2026; proceeds listed as 622034.53

10b5-1 sale (Jan 20, 2026) 43,185 shares sale date 01/20/2026; proceeds listed as 476,274.41

Key Terms

Form 144, 10b5-1, Exercise of Stock Options

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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.

10b5-1 regulatory

"10b5-1 Sales for KANG SUN 1180 Page Avenue"

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.

Exercise of Stock Options financial

"Common | 04/01/2026 | Exercise of Stock Options"

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	1500000	25290000.00	137019004	04/01/2026	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	04/01/2026	Exercise of Stock Options	Issuer			1500000	04/01/2026	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	03/23/2026	217869	4095414.31
KANG SUN 1180 Page Avenue Fremont CA 94538	Common	02/23/2026	61251	622034.53
10b5-1 Sales for KANG SUN 1180 Page Avenue Fremont CA 94538	Common	01/20/2026	43185	476274.41
10b5-1 Sales for KANG SUN 1180 Page Avenue Fremont CA 94538	Common	01/16/2026	950548	10518708.21
10b5-1 Sales for KANG SUN 1180 Page Avenue Fremont CA 94538	Common	01/12/2026	506267	5111474.14

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 Form 144 for AMPX disclose?

It discloses a proposed sale of 1,500,000 shares to occur on 04/01/2026 via an exercise of stock options. The filing also lists several recent 10b5-1 sales by KANG SUN in Jan–Mar 2026.

Who is listed as having recent 10b5-1 sales in the filing?

KANG SUN is listed with multiple 10b5-1 sales, including 950,548 shares on 01/16/2026 and 217,869 shares on 03/23/2026, with dollar proceeds shown for each trade.

How is the 1,500,000-share sale being executed?

The sale is described as an exercise of stock options and the consideration type is cash, with the proposed trade date of 04/01/2026 as stated in the notice.

Do the listed past sales include dollar amounts?

Yes; each past 10b5-1 sale entry shows proceeds, for example 217,869 shares on 03/23/2026 with proceeds listed as $4,095,414.31 in the excerpt.