Ambiq Micro CEO Fumihide Esaka sells 5,000 shares

Q: How many AMBQ shares did CEO Fumihide Esaka sell, and at what prices?

Fumihide Esaka sold 5,000 common shares on October 15, 2026, in four transactions at weighted-average prices of $49.1340 (500 shares), $50.0220 (500 shares), $51.1478 (2,800 shares), and $51.8547 (1,200 shares) per share. The sales were under a Rule 10b5-1 plan adopted May 15, 2026.

Q: What options did AMBQ CEO Fumihide Esaka exercise?

Esaka exercised options covering 5,000 shares at $8.1200 per share on October 15, 2026, receiving 5,000 common shares. After the exercise, he directly held options covering 53,507 shares.

The reported option exercise and share sales were made under a Rule 10b5-1 plan adopted May 15, 2026.

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Rhea-AI Filing Summary

Ambiq Micro, Inc. (AMBQ) Chief Executive Officer Fumihide Esaka exercised options covering 5,000 shares at $8.1200 per share on October 15, 2026, acquiring 5,000 common shares. He sold 5,000 common shares in four reported transactions: 500 at a weighted-average $49.1340, 500 at $50.0220, 2,800 at $51.1478, and 1,200 at $51.8547 per share. The exercise and sales were made under a Rule 10b5-1 plan adopted May 15, 2026. After the exercise, Esaka directly held options covering 53,507 shares.

Insider Trade Summary 10b5-1

Exercise and Sale: 5,000 shares ($214K approx. pre-tax spread)

Exercise and Sale 6 txns

Insider Esaka Fumihide

Role Chief Executive Officer

Sold 5,000 shs ($255K)

Approx. gross sale proceeds $255K

Approx. exercise cost $41K

Approx. pre-tax spread $214K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) ^{F1, F6}	5,000	$0.00	$0.00
Exercise	Common Stock ^F1	5,000	$8.12	$41K
Sale	Common Stock ^{F1, F2}	500	$49.134	$25K
Sale	Common Stock ^{F1, F3}	500	$50.022	$25K
Sale	Common Stock ^{F1, F4}	2,800	$51.1478	$143K
Sale	Common Stock ^{F1, F5}	1,200	$51.8547	$62K

Holdings After Transaction: Stock Option (Right to Buy) — 53,507 contracts (Direct); Common Stock — 443,900 shares (Direct)

Footnotes (6)

F1. The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on May 15, 2026.
F2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $48.66 to $49.59 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
F3. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $49.75 to $50.74 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
F4. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $50.77 to $51.75 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
F5. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $51.77 to $52.00 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
F6. 1/4 of the shares subject to the option vested on February 21, 2020, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.

Key Figures

Options exercised: 5,000 shares Exercise price: $8.1200 per share Common shares acquired: 5,000 shares +5 more

8 metrics

Options exercised 5,000 shares October 15, 2026

Exercise price $8.1200 per share Options exercised October 15, 2026

Common shares acquired 5,000 shares October 15, 2026

Options held after exercise 53,507 shares Directly held after the October 15, 2026 exercise

Sale transaction 500 shares at $49.1340 per share Weighted-average sale price; October 15, 2026

Sale transaction 500 shares at $50.0220 per share Weighted-average sale price; October 15, 2026

Sale transaction 2,800 shares at $51.1478 per share Weighted-average sale price; October 15, 2026

Sale transaction 1,200 shares at $51.8547 per share Weighted-average sale price; October 15, 2026

Key Terms

Rule 10b5-1 plan, weighted average sale price, Stock Option (Right to Buy), vested

4 terms

Rule 10b5-1 plan regulatory

"occurred under a Rule 10b5-1 plan adopted by the Reporting Person"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

weighted average sale price financial

"The reported price in Column 4 is a weighted average sale price"

Stock Option (Right to Buy) financial

"Stock Option (Right to Buy)"

vested financial

"1/48 of the shares subject to the option vested in equal monthly installments"

FAQ

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

How many AMBQ shares did CEO Fumihide Esaka sell, and at what prices?

Fumihide Esaka sold 5,000 common shares on October 15, 2026, in four transactions at weighted-average prices of $49.1340 (500 shares), $50.0220 (500 shares), $51.1478 (2,800 shares), and $51.8547 (1,200 shares) per share. The sales were under a Rule 10b5-1 plan adopted May 15, 2026.

What options did AMBQ CEO Fumihide Esaka exercise?

Esaka exercised options covering 5,000 shares at $8.1200 per share on October 15, 2026, receiving 5,000 common shares. After the exercise, he directly held options covering 53,507 shares.

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

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Available on EDGAR 10/16/2026 - 04:53 PM EDT Accepted by SEC EDGAR 10/16/2026 - 04:52 PM EDT

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Esaka Fumihide

(Last)

(First)

(Middle)

C/O AMBIQ MICRO, INC.

6500 RIVER PLACE BLVD BUILDING 7 STE 200

(Street)

AUSTIN

TEXAS

78730

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Ambiq Micro, Inc. [ AMBQ ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	10/15/2026		M⁽¹⁾		5,000	A	$8.12	448,900	D
Common Stock	10/15/2026		S⁽¹⁾		500	D	$49.134⁽²⁾	448,400	D
Common Stock	10/15/2026		S⁽¹⁾		500	D	$50.022⁽³⁾	447,900	D
Common Stock	10/15/2026		S⁽¹⁾		2,800	D	$51.1478⁽⁴⁾	445,100	D
Common Stock	10/15/2026		S⁽¹⁾		1,200	D	$51.8547⁽⁵⁾	443,900	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$8.12	10/15/2026		M⁽¹⁾			5,000	⁽⁶⁾	02/20/2029	Common Stock	5,000	$0	53,507	D

Explanation of Responses:

1. The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on May 15, 2026.

2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $48.66 to $49.59 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

3. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $49.75 to $50.74 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

4. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $50.77 to $51.75 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

5. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $51.77 to $52.00 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

6. 1/4 of the shares subject to the option vested on February 21, 2020, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.

	/s/ Jeffrey Winzeler, Attorney-in-Fact	10/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR