Ambiq's Fumihide Esaka files notice for $2.76M stock sale

Ambiq Micro, Inc. (AMBQ) is the issuer of common stock that Fumihide (Humi) Esaka has notified for potential resale under Rule 144.

Rhea-AI Filing Summary

Ambiq Micro, Inc. (AMBQ) is the issuer of common stock that Fumihide (Humi) Esaka has notified for potential resale under Rule 144. The notice covers 48,973 shares of common stock, held through Morgan Stanley Smith Barney LLC Executive Financial Services. The securities section reports an aggregate market value of $2,761,533.60 for these shares and shows 24,184,536 shares outstanding as of 09/01/2026; this is a baseline figure, not the amount being sold. The shares to be sold are linked to an exercise of options under a registered plan for cash, with Ambiq Micro common stock listed on the NYSE. Esaka also reports prior sales over the past three months.

Key Figures

Shares to be sold: 48,973 shares of common stock Aggregate market value of shares: $2,761,533.60 Shares outstanding: 24,184,536 shares +3 more

6 metrics

Shares to be sold 48,973 shares of common stock Covered by the Rule 144 notice for Ambiq Micro, Inc.

Aggregate market value of shares $2,761,533.60 Reported for the 48,973 Ambiq Micro, Inc. shares in the securities information section

Shares outstanding 24,184,536 shares Ambiq Micro, Inc. common stock outstanding as of 09/01/2026

Prior sale on 08/31/2026 35,000 shares for $2,009,854.00 Common stock sold by Fumihide (Humi) Esaka during the prior three months

Prior sale on 08/14/2026 13,500 shares for $869,225.85 Common stock sold by Fumihide (Humi) Esaka during the prior three months

Planned sale date 09/01/2026 Date associated with the securities to be sold and the Rule 144 notice

Key Terms

Rule 144, Exercise of Options Under a Registered Plan, Morgan Stanley Smith Barney LLC Executive Financial Services, securities to be sold

4 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.

Exercise of Options Under a Registered Plan financial

"Common | 09/01/2026 | Exercise of Options Under a Registered Plan | Issuer"

Morgan Stanley Smith Barney LLC Executive Financial Services financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

securities to be sold financial

"Name of Person for Whose Account the Securities are To Be Sold"

FAQ

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

What did AMBQ insider Fumihide Esaka file in this Form 144?

Fumihide (Humi) Esaka filed a notice under Rule 144 to potentially sell 48,973 shares of Ambiq Micro, Inc. (AMBQ) common stock, related to the exercise of options under a registered plan for cash.

How many AMBQ shares are covered by this Rule 144 notice?

The notice covers 48,973 shares of Ambiq Micro, Inc. common stock. These shares are held through Morgan Stanley Smith Barney LLC Executive Financial Services and are associated with an exercise of options under a registered plan.

What is the reported market value of the AMBQ shares in this Form 144?

The securities information section reports an aggregate market value of $2,761,533.60 for the 48,973 shares of Ambiq Micro, Inc. common stock covered by the Rule 144 notice.

How many AMBQ shares were outstanding as of September 1, 2026?

The filing reports that 24,184,536 shares of Ambiq Micro, Inc. common stock were outstanding as of 09/01/2026. This figure is context for the issuer’s capital structure and is not the amount being sold.

What AMBQ stock sales has Fumihide Esaka made in the past three months?

The filing lists prior sales of Ambiq Micro, Inc. common stock by Fumihide Esaka: 35,000 shares sold on 08/31/2026 for $2,009,854.00 and 13,500 shares sold on 08/14/2026 for $869,225.85.

On which exchange is AMBQ common stock listed according to the filing?

The securities information section shows Ambiq Micro, Inc. common stock listed on the NYSE for the shares covered by this Rule 144 notice.

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

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Available on EDGAR 09/01/2026 - 04:15 PM EDT Accepted by SEC EDGAR 09/01/2026 - 04:15 PM EDT 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 (HUMI) 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	48973	2761533.60	24184536	09/01/2026	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	09/01/2026	Exercise of Options Under a Registered Plan	Issuer			48973	09/01/2026	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
FUMIHIDE (HUMI) ESAKA 6500 River Place Blvd. Building 7 Austin TX 78730	Common	08/31/2026	35000	2009854.00
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	09/01/2026
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)