Ambiq Micro (AMBQ) CFO receives 41,728 RSUs in equity award

Rhea-AI Filing Summary

Ambiq Micro, Inc. Chief Financial Officer Jeffrey G. Winzeler received a grant of 41,728 shares of Common Stock in the form of restricted stock units at no cash cost. Each RSU converts into one share of common stock when it vests.

According to the award terms, 25% of the RSUs will vest on October 1, 2027, and the remaining units will vest in equal quarterly installments thereafter, contingent on his continued service under the company’s 2025 Equity Incentive Plan. Following this grant, Winzeler directly holds 94,395 shares of Ambiq Micro 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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Key Figures

RSU grant size: 41,728 shares Price per RSU: $0.00 per share Holdings after grant: 94,395 shares +2 more

5 metrics

RSU grant size 41,728 shares Restricted stock units granted on March 6, 2026

Price per RSU $0.00 per share Grant/award acquisition with no cash cost

Holdings after grant 94,395 shares Total common stock directly held following transaction

Initial vesting tranche 25% of RSUs Vests on October 1, 2027

Subsequent vesting pace 1/12 of RSUs quarterly After October 1, 2027, subject to continuous service

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 to receive one share"

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^*

Winzeler Jeffrey G

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial 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		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 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	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 AMBQ’s CFO report on this Form 4/A?

Ambiq Micro’s CFO Jeffrey G. Winzeler reported receiving 41,728 restricted stock units. These RSUs are equity compensation, granted at no cash cost, and will convert into common shares as they vest over time, aligning his interests more closely with shareholders.

How many AMBQ shares does the CFO hold after this RSU grant?

After the grant, CFO Jeffrey G. Winzeler directly holds 94,395 shares of Ambiq Micro common stock. This total reflects the newly awarded 41,728 restricted stock units, which will settle into shares as they vest under the specified schedule.

What is the vesting schedule for the 41,728 AMBQ RSUs granted to the CFO?

The 41,728 restricted stock units vest in stages. Twenty-five percent vest on October 1, 2027, with the remaining shares vesting in equal quarterly installments. Vesting is conditioned on the CFO’s continuous service under Ambiq Micro’s 2025 Equity Incentive Plan.

Does the AMBQ CFO pay anything for the 41,728 RSU grant?

No, the reported transaction price per share is zero, meaning the CFO does not pay cash for these RSUs. They are a compensation award that converts into common shares upon vesting, subject to the stated service conditions in the equity plan.

What does each AMBQ RSU granted to the CFO represent?

Each restricted stock unit represents a contingent right to receive one share of Ambiq Micro common stock. The units only convert into actual shares when they vest, and vesting depends on the CFO maintaining continuous service with the company.

Under which plan were the AMBQ CFO’s RSUs granted?

The RSUs were granted under Ambiq Micro’s 2025 Equity Incentive Plan. This plan governs equity-based compensation awards, setting terms for vesting, continuous service requirements, and settlement into common stock for eligible employees and executives.