Ambiq Micro holder plans $3.2M stock sale

Security holder Fumihide Esaka has filed to sell 50,000 AMBQ common shares under Rule 144 following option exercises under a registered plan.

Rhea-AI Filing Summary

Ambiq Micro, Inc. (AMBQ) has a planned secondary sale by security holder Fumihide Esaka under Rule 144. Esaka has filed to sell 50,000 shares of common stock, with an aggregate market value of $3,167,995, based on Ambiq Micro’s common stock listed on the NYSE.

The notice indicates Ambiq Micro had 24,185,000 shares of common stock outstanding. The shares to be sold are to be delivered through Morgan Stanley Smith Barney LLC, and Esaka’s planned sales are associated with the exercise of options under a registered plan for cash.

Key Figures

Shares to be sold under Rule 144: 50,000 shares Aggregate market value of shares to be sold: $3,167,995 Shares outstanding: 24,185,000 shares +4 more

7 metrics

Shares to be sold under Rule 144 50,000 shares Planned secondary sale of Ambiq Micro common stock by Fumihide Esaka

Aggregate market value of shares to be sold $3,167,995 Value of the 50,000 planned shares of Ambiq Micro common stock

Shares outstanding 24,185,000 shares Ambiq Micro common stock outstanding referenced in the filing

Options exercised (first block) 19,007 shares Exercise of options under a registered plan for cash on September 11, 2026

Options exercised (second block) 30,993 shares Exercise of options under a registered plan for cash on September 11, 2026

Past sale September 2, 2026 11,027 shares for $625,108.50 Sale of Ambiq Micro common stock by Fumihide Esaka in last 3 months

Past sale September 1, 2026 48,973 shares for $2,761,533.60 Sale of Ambiq Micro common stock by Fumihide Esaka in last 3 months

Key Terms

Rule 144, aggregate market value, Exercise of Options Under a Registered Plan

3 terms

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.

aggregate market value financial

"50000 | 3167995.00 | 24185000 | 09/11/2026 | NYSE"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Exercise of Options Under a Registered Plan financial

"Common | 09/11/2026 | Exercise of Options Under a Registered Plan | Issuer"

FAQ

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

What does the Form 144 filing disclose for AMBQ?

It discloses that Fumihide Esaka plans to sell 50,000 shares of Ambiq Micro, Inc. common stock under Rule 144, with an aggregate market value of $3,167,995, following option exercises under a registered plan for cash.

How many AMBQ shares are planned to be sold and at what value?

The notice covers a proposed sale of 50,000 AMBQ common shares with an aggregate market value of $3,167,995, as reported in the Form 144 filing.

What is Ambiq Micro, Inc. (AMBQ)’s share count referenced in the filing?

The filing states that Ambiq Micro, Inc. had 24,185,000 shares of common stock outstanding, providing context for the size of the 50,000-share planned Rule 144 sale.

How are the AMBQ shares being acquired for the planned sale?

The Form 144 indicates the common shares are tied to the exercise of options under a registered plan for cash, with option exercises for 19,007 and 30,993 shares both dated September 11, 2026.

What prior AMBQ stock sales by Fumihide Esaka are reported?

The filing lists past 3‑month sales, including 11,027 shares for $625,108.50 on September 2, 2026, 48,973 shares for $2,761,533.60 on September 1, 2026, and several August 2026 transactions in blocks of 13,500–35,000 shares.

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

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Available on EDGAR 09/11/2026 - 04:12 PM Accepted by SEC EDGAR 09/11/2026 - 04:11 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	0002078454
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	(512) 879-2850
Name of Person for Whose Account the Securities are To Be Sold	FUMIHIDE ESAKA
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
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 Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	50000	3167995.00	24185000	09/11/2026	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	09/11/2026	Exercise of Options Under a Registered Plan	Issuer			19007	09/11/2026	Cash
Common	09/11/2026	Exercise of Options Under a Registered Plan	Issuer			30993	09/11/2026	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
FUMIHIDE (HUMI) ESAKA 6500 River Place Blvd. Building 7 Austin TX 78730	Common	09/02/2026	11027	625108.50
FUMIHIDE (HUMI) ESAKA 6500 River Place Blvd. Building 7 Austin TX 78730	Common	09/01/2026	48973	2761533.60
FUMIHIDE (HUMI) ESAKA 6500 River Place Blvd. Building 7 Austin TX 78730	Common	08/31/2026	35000	2009854.00
Fumihide Esaka 6500 River Place Blvd. Building 7 Austin TX 78730	common	08/31/2026	13500	776650.20
Fuhmide Esaka 6500 River Place Blvd. Building 7 Austin TX 78730	common	08/14/2026	13500	869225.85

144: Remarks and Signature

Remarks
Date of Notice	09/11/2026
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/ Fumihide Esaka
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)