Large RSU grant lifts Ambiq Micro (AMBQ) CEO holdings to 391,189

Rhea-AI Filing Summary

Ambiq Micro, Inc.’s Chief Executive Officer, Esaka Fumihide, received a grant of 160,616 shares of common stock in the form of restricted stock units. The award carries no cash exercise price and is part of equity compensation, not an open-market purchase.

According to the terms, 25% of the RSUs will vest on October 1, 2027, and the remaining 75% will vest in equal quarterly installments of 1/12 thereafter, so long as he maintains Continuous Service under Ambiq’s 2025 Equity Incentive Plan. Following this grant, he directly holds 391,189 shares of common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Esaka Fumihide

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	160,616	$0.00	--

Holdings After Transaction: Common Stock — 391,189 shares (Direct)

Footnotes (1)

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Key Figures

RSU grant size: 160,616 shares Price per RSU: $0.00 per share Holdings after grant: 391,189 shares +1 more

4 metrics

RSU grant size 160,616 shares Restricted stock units granted to CEO Esaka Fumihide

Price per RSU $0.00 per share Equity compensation grant, no cash exercise price

Holdings after grant 391,189 shares CEO direct common stock holdings following the RSU award

Initial vesting date October 1, 2027 25% of RSUs vest on this date if Continuous Service is maintained

Key Terms

restricted stock units (RSUs), Continuous Service, 2025 Equity Incentive Plan

3 terms

restricted stock units (RSUs) financial

"Represents the grant of restricted stock units (RSUs). Each RSU represents a contingent right"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

Continuous Service financial

"will vest quarterly thereafter, subject to the Reporting Person's Continuous Service"

2025 Equity Incentive Plan financial

"Continuous Service (as defined in the Issuer's 2025 Equity Incentive Plan)."

Form 4 Insider Transactions: What Each Field Means →

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)
03/06/2026

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)
03/10/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/06/2026		A		160,616(1)	A	$0	391,189	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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the grant of restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Common Stock upon settlement. 25% of the shares subject to the RSU will vest on October 1, 2027, and 1/12 of the shares subject to the RSU will vest quarterly thereafter, subject to the Reporting Person's Continuous Service (as defined in the Issuer's 2025 Equity Incentive Plan).

Remarks:

This Form 4 is being amended solely to correct an inadvertent administrative error affecting the vesting commencement date of the RSUs reported herein.

	/s/ Jeffrey Winzeler, Attorney-in-Fact	04/02/2026
	** 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)

FAQ

What insider transaction did Ambiq Micro (AMBQ) report for its CEO?

Ambiq Micro reported that CEO Esaka Fumihide received 160,616 restricted stock units, each representing one share of common stock. This equity award is compensation at no cash cost per share, rather than an open-market stock purchase, and increases his direct holdings to 391,189 shares.

How many Ambiq Micro (AMBQ) shares were granted to the CEO in this Form 4/A?

The CEO received 160,616 restricted stock units, each convertible into one share of Ambiq Micro common stock upon settlement. This award significantly increases his equity-based compensation, aligning his interests with shareholders through a multi-year vesting schedule tied to continued service at the company.

What is the vesting schedule for the Ambiq Micro (AMBQ) CEO’s RSU grant?

The grant vests 25% of the restricted stock units on October 1, 2027. The remaining 75% vests in equal quarterly installments of 1/12 thereafter, provided Esaka Fumihide maintains Continuous Service under Ambiq Micro’s 2025 Equity Incentive Plan during the vesting period.

How many Ambiq Micro (AMBQ) shares does the CEO hold after this RSU award?

After the RSU award, CEO Esaka Fumihide directly holds 391,189 shares of Ambiq Micro common stock. This total reflects the impact of the 160,616 restricted stock units granted, which will convert into shares as they vest over the defined multi-year schedule.

Is the Ambiq Micro (AMBQ) CEO’s RSU grant an open-market stock purchase?

No, the transaction is a grant of restricted stock units as compensation, not an open-market purchase. The RSUs have a zero dollar price per share and convert into common stock over time based on the vesting conditions set in the 2025 Equity Incentive Plan.