[Form 4] Ambiq Micro, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Esaka Fumihide reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. reported that Chief Executive Officer Fumihide Esaka received a grant of 160,616 restricted stock units (RSUs) of common stock at no cost as equity compensation. Each RSU represents one share upon settlement. Following this award, he directly holds 391,189 shares. The RSUs vest over time: 25% of the shares are scheduled to vest on September 1, 2027, and the remaining shares vest in equal quarterly installments thereafter, contingent on his continued service under the company’s 2025 Equity Incentive Plan.

Insights

Equity compensation analyst

CEO receives time-vested RSU grant as part of long-term equity compensation.

Chief Executive Officer Fumihide Esaka was granted 160,616 RSUs of Ambiq Micro common stock at a price of $0.00 per share. This is a non-cash equity award, not an open-market purchase or sale.

The award vests over time: 25% on September 1, 2027, with the remaining 75% vesting in equal quarterly installments, conditioned on continuous service under the 2025 Equity Incentive Plan. This structure is typical for aligning leadership incentives with multi-year company performance.

After the grant, Esaka directly holds 391,189 common shares. Because this is a routine compensation grant rather than a discretionary market trade, its signaling value for short-term stock sentiment is limited, though it does increase his long-term equity exposure.

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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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 TX 78730

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

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

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

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

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 September 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).

	/s/ Jeffrey Winzeler, Attorney-in-Fact	03/10/2026
	** 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.

FAQ

What did Ambiq Micro (AMBQ) disclose about CEO Fumihide Esaka in this Form 4?

Ambiq Micro disclosed that CEO Fumihide Esaka received a grant of 160,616 restricted stock units (RSUs). These RSUs represent future shares of common stock and were granted at no cash cost as part of his equity-based compensation package.

How many Ambiq Micro (AMBQ) RSUs were granted to the CEO and at what price?

The CEO was granted 160,616 restricted stock units of Ambiq Micro common stock at a price of $0.00 per share. This means the award is purely equity compensation, not a cash purchase in the open market or a sale transaction.

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

The RSU grant vests over several years. Twenty-five percent of the 160,616 RSUs will vest on September 1, 2027, and the remaining 75% will vest in equal quarterly installments, conditioned on the CEO’s continuous service with the company.

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

Following the RSU grant, CEO Fumihide Esaka is reported to directly own 391,189 shares of Ambiq Micro common stock. This figure includes the impact of the newly awarded RSUs as reflected in the Form 4’s post-transaction ownership line.

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

The CEO’s transaction is not an open-market trade. It is an equity compensation grant coded as an acquisition (A), representing 160,616 RSUs awarded at $0.00 per share, rather than a discretionary buy or sell in the public market.

Under which plan were the Ambiq Micro (AMBQ) RSUs granted to the CEO?

The restricted stock units were granted under Ambiq Micro’s 2025 Equity Incentive Plan. Vesting of the RSUs is explicitly conditioned on the CEO’s continuous service, tying the award to his ongoing employment and long-term company performance.