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

Rhea-AI Filing Summary

Ambiq Micro, Inc. (AMBQ) reported an insider equity award: Sean Chihhsiang Chen, the company's President and COO, received 56,029 restricted stock units (RSUs) on 10/02/2025. Each RSU converts to one share of common stock upon settlement and was granted at a $0 per-share price, indicating a compensatory award rather than a purchase. The RSUs vest 25% on 10/01/2026, with the remaining shares vesting in equal quarterly installments of 1/12 thereafter, subject to continuous service under the 2025 Equity Incentive Plan. The Form 4 discloses 56,029 shares beneficially owned following the grant.

Insights

Compensation & Governance Analyst

RSU grant ties executive pay to shareholder alignment while using time-based vesting to retain the COO.

The award of 56,029 RSUs is a standard equity‑based compensation tool that vests 25% after one year and then quarterly, which aligns the executive's interests with long‑term shareholder value and incentivizes continued service through staggered vesting.

Key dependencies and risks include the share settlement mechanics and potential dilution depending on the company's outstanding share count; monitor any future disclosures showing the total shares outstanding or additional grants within 2026 for near‑term dilution signals.

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^*

Chen Sean Chihhsiang

(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)
	President and COO

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		56,029(1)	A	$0	56,029	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, Attorney-in-Fact	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.

FAQ

What did AMBQ report on this Form 4?

The Form 4 reports a grant of 56,029 restricted stock units to Sean Chihhsiang Chen, President and COO, dated 10/02/2025.

How do the RSUs vest for the AMBQ grant?

The RSUs vest 25% on 10/01/2026 with the remaining shares vesting in 1/12 increments quarterly thereafter, subject to continuous service.

What is the cost to the reporting person for these RSUs?

The grant was reported at a $0 price per RSU, indicating no cash purchase price for the award.

How many shares does the reporting person beneficially own after the transaction?

The Form 4 shows the reporting person beneficially owns 56,029 shares following the reported transaction.

Does the filing indicate performance conditions for vesting?

No. The filing states vesting is based on Continuous Service under the 2025 Equity Incentive Plan with time‑based vesting; no performance metrics are disclosed.