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

Rhea-AI Filing Summary

Ambiq Micro, Inc. reported a Form 4 showing that Jeffrey G. Winzeler, the company's Chief Financial Officer and a director, was granted 52,667 restricted stock units (RSUs) on 10/02/2025. The RSUs have a grant price of $0, meaning they are equity awards that convert to common stock upon settlement rather than a cash purchase.

Per the award terms, 25% of the RSUs vest on 10/01/2026, with the remainder vesting in equal quarterly installments at a rate of 1/12 of the total grant thereafter, subject to continued service under the 2025 Equity Incentive Plan. Following the grant, the reporting person beneficially owns 52,667 shares subject to the award, held directly.

Insights

Compensation Analyst

RSU grant aligns CFO pay with shareholder value via time‑based vesting.

The grant of 52,667 RSUs is a time‑based equity award that vests 25% after one year and then quarterly in 1/12 increments, which is a standard retention structure to encourage continued service. The $0 price indicates these are performance-independent restricted units that convert into common shares on settlement.

This structure primarily ties the CFO's compensation to total shareholder return over the vesting horizon; investors may watch the company’s future filings for the settlement date and any disclosures of post‑grant dilution over the next 12–48 months.

Corporate Governance Analyst

A director/officer equity grant is routine but increases potential share dilution.

Because the reporting person is both an officer and a director, the award follows typical governance practice to align management interests with shareholders while remaining subject to plan terms. The filing lists ownership as direct, showing the grant is recorded to the individual.

Key near‑term items to observe are the 10/01/2026 initial vest date and subsequent quarterly vesting; any future filings that show settlement or additional grants will clarify cumulative dilution effects within the next 1–4 years.

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^*

Winzeler Jeffrey G

(Last) (First) (Middle)

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
10/02/2025

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	10/02/2025		A		52,667(1)	A	$0	52,667	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, 2026, 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	10/06/2025
	** 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.