Ambiq COO exercises options, sells 15K shares

Ambiq Micro, Inc. (AMBQ) reports that President and COO Sean Chihhsiang Chen exercised options for 15,000 shares of common stock on September 4, 2026 at an exercise price of $8.12 per share and continues to hold 149,423 option shares.

Rhea-AI Filing Summary

Ambiq Micro, Inc. (AMBQ) reports that President and COO Sean Chihhsiang Chen exercised options for 15,000 shares of common stock on September 4, 2026 at an exercise price of $8.12 per share and continues to hold 149,423 option shares. On the same date, he sold a total of 15,000 common shares in two transactions at weighted average prices of $57.09 and $57.68 per share, all under a Rule 10b5-1 plan adopted on June 5, 2026.

Insider Trade Summary 10b5-1

Exercise and Sale: 15,000 shares ($736K approx. pre-tax spread)

Exercise and Sale 4 txns

Insider Chen Sean Chihhsiang

Role President and COO

Sold 15,000 shs ($858K)

Approx. gross sale proceeds $858K

Approx. exercise cost $122K

Approx. pre-tax spread $736K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) F1, F4	15,000	$0.00	$0.00
Exercise	Common Stock F1	15,000	$8.12	$122K
Sale	Common Stock F1, F2	12,874	$57.0866	$735K
Sale	Common Stock F1, F3	2,126	$57.6786	$123K

Holdings After Transaction: Stock Option (Right to Buy) — 149,423 contracts (Direct); Common Stock — 120,275 shares (Direct)

Footnotes (4)

1. F1. The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on June 5, 2026
2. F2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $56.54 to $57.49 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
3. F3. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $57.58 to $57.79 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
4. F4. 1/4 of the shares subject to the option vested on February 21, 2020, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.

Key Figures

Options exercised: 15,000 shares Option exercise price: $8.12 per share Shares sold (total): 15,000 shares +5 more

8 metrics

Options exercised 15,000 shares Options for Ambiq Micro common stock exercised on September 4, 2026

Option exercise price $8.12 per share Exercise price for 15,000 options into Ambiq Micro common stock

Shares sold (total) 15,000 shares Common shares sold on September 4, 2026 in two sale transactions

Weighted average sale price (block 1) $57.0866 per share 12,874 shares of common stock sold on September 4, 2026

Weighted average sale price (block 2) $57.6786 per share 2,126 shares of common stock sold on September 4, 2026

Remaining option holdings 149,423 shares Options for Ambiq Micro common stock held after the reported exercise

Rule 10b5-1 plan adoption date June 5, 2026 Date the reporting person adopted the trading plan covering these transactions

Option expiration date February 20, 2029 Expiration date of the stock option from which 15,000 shares were exercised

Key Terms

Rule 10b5-1 plan, weighted average sale price, vested, continued service

4 terms

Rule 10b5-1 plan regulatory

"The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on June 5, 2026"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

weighted average sale price financial

"The reported price in Column 4 is a weighted average sale price."

vested financial

"1/4 of the shares subject to the option vested on February 21, 2020"

continued service other

"in equal monthly installments thereafter, subject to the Reporting Person's continued service."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did AMBQ’s President and COO report in this Form 4?

He exercised 15,000 options for Ambiq Micro, Inc. common stock at an exercise price of $8.12 per share and sold 15,000 shares of common stock on September 4, 2026 in two transactions at weighted average prices above $57 per share.

At what prices were the AMBQ shares sold by the executive?

The executive sold AMBQ common shares at weighted average prices of $57.0866 and $57.6786 per share. Footnotes state the actual sale prices ranged from $56.54–$57.49 and $57.58–$57.79 per share across multiple trades.

How many Ambiq Micro (AMBQ) options does the executive hold after these transactions?

After exercising 15,000 options, the executive continues to hold 149,423 options for Ambiq Micro common stock, according to the reported post-transaction option balance on the derivative security.

Were the AMBQ trades made under a Rule 10b5-1 plan?

Yes. A footnote states that all transactions reported occurred under a Rule 10b5-1 plan adopted by the reporting person on June 5, 2026, indicating they followed a pre-established trading arrangement.

What vesting schedule applied to the exercised AMBQ stock options?

A footnote explains that 1/4 of the option shares vested on February 21, 2020, and 1/48 of the shares vested in equal monthly installments thereafter, subject to the reporting person’s continued service.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/09/2026 - 05:11 PM Accepted by SEC EDGAR 09/09/2026 - 05:10 PM Learn about SEC filing dates

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).

X

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)

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)
	President and COO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/04/2026

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)

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	09/04/2026		M(1)		15,000	A	$8.12	135,275	D
Common Stock	09/04/2026		S(1)		12,874	D	$57.0866(2)	122,401	D
Common Stock	09/04/2026		S(1)		2,126	D	$57.6786(3)	120,275	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
Stock Option (Right to Buy)	$8.12	09/04/2026		M(1)			15,000	(4)	02/20/2029	Common Stock	15,000	$0	149,423	D

Explanation of Responses:

1. The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on June 5, 2026

2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $56.54 to $57.49 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

3. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $57.58 to $57.79 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

4. 1/4 of the shares subject to the option vested on February 21, 2020, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.

	/s/ Paula Floyd, Attorney-in-Fact	09/09/2026
	** 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)