Ambiq Micro officer Chen proposes $3.63M stock sale

Three earlier sales were reported with proceeds of $403,819.20, $902,130.00, and $857,557.50, each marked as a 10b5-1 sale.

Rhea-AI Filing Summary

Ambiq Micro, Inc. reports that Officer Sean Chen proposes to sell 53,205 shares of common stock, with an aggregate market value of $3,627,516.90. The proposed securities are to be received through stock-option exercises over the next three months, with acquisition and payment dates matching the exercise and sale dates.

Chen also reported three sales during the prior three months, each marked as a 10b5-1 sale: 5,802 shares on October 2, 2026, for $403,819.20; 15,000 shares on September 14, 2026, for $902,130.00; and 15,000 shares on September 4, 2026, for $857,557.50.

Key Figures

Proposed shares: 53,205 shares Aggregate market value: $3,627,516.90 Shares sold: 5,802 shares +5 more

8 metrics

Proposed shares 53,205 shares Proposed sale of common stock

Aggregate market value $3,627,516.90 Proposed sale

Shares sold 5,802 shares October 2, 2026

Gross proceeds $403,819.20 Sale on October 2, 2026

Shares sold 15,000 shares September 14, 2026

Gross proceeds $902,130.00 Sale on September 14, 2026

Shares sold 15,000 shares September 4, 2026

Gross proceeds $857,557.50 Sale on September 4, 2026

Key Terms

Rule 144, 10b5-1 Sales, Restricted Stock Units

3 terms

Rule 144 regulatory

"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.

10b5-1 Sales regulatory

"10b5-1 Sales for SEAN CHEN"

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

"Restricted Stock Units"

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.

FAQ

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

How many AMBQ shares does Sean Chen propose to sell?

Sean Chen proposes to sell 53,205 shares of common stock, with an aggregate market value of $3,627,516.90. The securities are to be received through stock-option exercises over the next three months.

What recent AMBQ sales did Sean Chen report?

Sean Chen reported sales of 5,802 shares on October 2, 2026, for $403,819.20; 15,000 shares on September 14, 2026, for $902,130.00; and 15,000 shares on September 4, 2026, for $857,557.50. Each was marked as a 10b5-1 sale.

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

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Available on EDGAR 10/05/2026 - 04:46 PM Accepted by SEC EDGAR 10/05/2026 - 04:45 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	0002078559
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	Ambiq Micro, Inc.
SEC File Number	001-42766
Address of Issuer	6500 River Place Blvd. Building 7 Austin TEXAS 78730
Phone	5128792850
Name of Person for Whose Account the Securities are To Be Sold	SEAN CHEN
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	Officer

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	53205	3627516.90	24184536	10/05/2026	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	10/05/2026	Exercise of Stock Options	Issuer			45000	10/05/2026	Cash
Common	10/01/2026	Restricted Stock Units	Issuer			8205	10/01/2026	N/A

* 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
SEAN CHEN 6500 River Place Blvd. Building 7 Austin TX 78730	Common	10/02/2026	5802	403819.20
10b5-1 Sales for SEAN CHEN 6500 River Place Blvd. Building 7 Austin TX 78730	Common	09/14/2026	15000	902130.00
10b5-1 Sales for SEAN CHEN 6500 River Place Blvd. Building 7 Austin TX 78730	Common	09/04/2026	15000	857557.50

144: Remarks and Signature

Remarks	The securities to be sold will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment will be the dates of exercise/sale.
Date of Notice	10/05/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/05/2026
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/ Sean Chen
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)