Ambiq (AMBQ) CFO receives 41,728 RSUs as equity award, holdings 94,395

Rhea-AI Filing Summary

Winzeler Jeffrey G reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. reported that Chief Financial Officer Jeffrey G. Winzeler received an equity grant in the form of 41,728 restricted stock units (RSUs) of common stock. The award has no cash purchase price and is part of his compensation rather than an open-market transaction.

Each RSU represents a right to receive one share of common stock upon settlement. According to the vesting schedule, 25% of the units will vest on September 1, 2027, and the remaining units will vest in equal quarterly installments over the following three years, subject to his continuous service under the 2025 Equity Incentive Plan. After this grant, Winzeler directly holds 94,395 shares of Ambiq common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Winzeler Jeffrey G

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	41,728	$0.00	--

Holdings After Transaction: Common Stock — 94,395 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^*

Winzeler Jeffrey G

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial 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		41,728(1)	A	$0	94,395	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	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 insider transaction did Ambiq Micro (AMBQ) report for its CFO?

Ambiq Micro reported that CFO Jeffrey G. Winzeler received a grant of 41,728 restricted stock units (RSUs) of common stock. This is a compensation-related equity award, not an open-market trade, and increases his overall equity-based stake in the company.

How large is the RSU grant to Ambiq Micro (AMBQ) CFO Jeffrey Winzeler?

Jeffrey Winzeler was granted 41,728 restricted stock units linked to Ambiq Micro common stock. Each RSU corresponds to one share upon settlement, making this a substantial equity award that forms part of his long-term incentive compensation structure tied to continued service.

What is the vesting schedule for the Ambiq Micro (AMBQ) CFO RSU award?

For this award, 25% of the RSUs will vest on September 1, 2027. The remaining 75% will vest in equal quarterly installments over the subsequent three years, as long as Winzeler maintains continuous service under Ambiq Micro’s 2025 Equity Incentive Plan.

Did the Ambiq Micro (AMBQ) CFO buy shares in the open market?

No, the Form 4 shows a grant of 41,728 restricted stock units at a price of $0.00 per unit. This reflects an equity compensation award, not an open-market purchase or sale, and therefore does not involve the CFO paying cash to acquire the shares.

How many Ambiq Micro (AMBQ) shares does the CFO hold after this RSU grant?

Following the reported grant, Jeffrey Winzeler directly holds 94,395 shares of Ambiq Micro common stock. This figure reflects his post-transaction share ownership position as reported, separate from the unvested restricted stock units that will settle into shares over time.

What plan governs the Ambiq Micro (AMBQ) CFO’s RSU award and what is required for vesting?

The RSU grant is made under Ambiq Micro’s 2025 Equity Incentive Plan. Vesting is conditioned on the CFO’s continuous service with the company, meaning the units vest over time only if he remains employed or otherwise continues in eligible service.