Ambiq Micro: Sean Chihhsiang Chen sells 14,007 shares

Q: How many AMBQ shares did Sean Chihhsiang Chen sell?

Chen reported sales totaling 14,007 shares. The October 2, 2026 transactions were 2,492, 3,008, and 302 shares; the October 5, 2026 transactions were 5,508, 1,797, 800, and 100 shares.

Q: What prices did Sean Chihhsiang Chen report for AMBQ shares?

On October 2, 2026, reported prices were $69.1083 for 2,492 shares, $69.7722 for 3,008 shares, and $71.8592 for 302 shares. On October 5, prices were $66.3808 for 5,508 shares, $67.2861 for 1,797, $68.0757 for 800, and $69.5100 for 100. The footnotes identify all listed prices except $69.5100 as weighted-average sale prices.

The President and COO's October 2 sales were under a sell-to-cover policy for certain tax obligations; October 5 sales were under a Rule 10b5-1 plan.

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Filing Sentiment

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Form Type

Rhea-AI Filing Summary

Ambiq Micro, Inc. (AMBQ) President and COO Sean Chihhsiang Chen reported sales totaling 14,007 shares of common stock. On October 2, 2026, the reported sales included 2,492, 3,008, and 302 shares under the issuer’s policy requiring sell-to-cover for certain tax obligations incurred with vesting and settlement of restricted stock units. On October 5, 2026, the reported sales included 5,508, 1,797, 800, and 100 shares under a Rule 10b5-1 plan adopted June 5, 2026.

Insights

Analyzing...

Insider Trade Summary 10b5-1

Net Seller: 14,007 shares

Net Sell 7 txns

Insider Chen Sean Chihhsiang

Role President and COO

Sold 14,007 shs ($952K)

Type	Security	Shares	Price	Value
Sale	Common Stock ^{F5, F6}	5,508	$66.3808	$366K
Sale	Common Stock ^{F5, F7}	1,797	$67.2861	$121K
Sale	Common Stock ^{F5, F8}	800	$68.0757	$54K
Sale	Common Stock ^F5	100	$69.51	$7K
Sale	Common Stock ^{F1, F2}	2,492	$69.1083	$172K
Sale	Common Stock ^{F1, F3}	3,008	$69.7722	$210K
Sale	Common Stock ^{F1, F4}	302	$71.8592	$22K

Holdings After Transaction: Common Stock — 106,268 shares (Direct)

Footnotes (8)

F1. This sale reported on this Form 4 was effected pursuant to the Issuer's policy requiring sell-to-cover to satisfy certain tax obligations of the Reporting Person incurred with the vesting and settlement of certain restricted stock units.
F2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $68.41 to $69.40 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.
F3. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $69.41 to $70.16 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.
F4. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $71.50 to $72.26 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.
F5. The transactions occurred under a Rule 10b5-1 plan adopted by the Reporting Person on June 5, 2026.
F6. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $65.90 to $66.89 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.
F7. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $66.90 to $67.85 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.
F8. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $67.93 to $68.17 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.

Key Figures

Shares sold; weighted-average sale price: 2,492 shares; $69.1083 per share Shares sold; weighted-average sale price: 3,008 shares; $69.7722 per share Shares sold; weighted-average sale price: 302 shares; $71.8592 per share +4 more

7 metrics

Shares sold; weighted-average sale price 2,492 shares; $69.1083 per share October 2, 2026 transaction

Shares sold; weighted-average sale price 3,008 shares; $69.7722 per share October 2, 2026 transaction

Shares sold; weighted-average sale price 302 shares; $71.8592 per share October 2, 2026 transaction

Shares sold; weighted-average sale price 5,508 shares; $66.3808 per share October 5, 2026 transaction

Shares sold; weighted-average sale price 1,797 shares; $67.2861 per share October 5, 2026 transaction

Shares sold; weighted-average sale price 800 shares; $68.0757 per share October 5, 2026 transaction

Shares sold; reported sale price 100 shares; $69.5100 per share October 5, 2026 transaction

Key Terms

Rule 10b5-1 plan, sell-to-cover, restricted stock units, weighted average sale price

4 terms

Rule 10b5-1 plan regulatory

"transactions occurred under a Rule 10b5-1 plan adopted by the Reporting Person"

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.

sell-to-cover financial

"policy requiring sell-to-cover to satisfy certain tax obligations"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

restricted stock units financial

"vesting and settlement of certain restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

weighted average sale price financial

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

FAQ

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

How many AMBQ shares did Sean Chihhsiang Chen sell?

Chen reported sales totaling 14,007 shares. The October 2, 2026 transactions were 2,492, 3,008, and 302 shares; the October 5, 2026 transactions were 5,508, 1,797, 800, and 100 shares.

What prices did Sean Chihhsiang Chen report for AMBQ shares?

On October 2, 2026, reported prices were $69.1083 for 2,492 shares, $69.7722 for 3,008 shares, and $71.8592 for 302 shares. On October 5, prices were $66.3808 for 5,508 shares, $67.2861 for 1,797, $68.0757 for 800, and $69.5100 for 100. The footnotes identify all listed prices except $69.5100 as weighted-average sale prices.

Were Sean Chihhsiang Chen's AMBQ sales made under a Rule 10b5-1 plan?

The October 5, 2026 sales were made under a Rule 10b5-1 plan adopted on June 5, 2026. The October 2 sales were reported under Ambiq Micro's policy requiring sell-to-cover to satisfy certain tax obligations incurred with vesting and settlement of restricted stock units.

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

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Available on EDGAR 10/06/2026 - 06:45 PM Accepted by SEC EDGAR 10/06/2026 - 06:45 PM

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)

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)
10/02/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	10/02/2026		S⁽¹⁾		2,492	D	$69.1083⁽²⁾	117,783	D
Common Stock	10/02/2026		S⁽¹⁾		3,008	D	$69.7722⁽³⁾	114,775	D
Common Stock	10/02/2026		S⁽¹⁾		302	D	$71.8592⁽⁴⁾	114,473	D
Common Stock	10/05/2026		S⁽⁵⁾		5,508	D	$66.3808⁽⁶⁾	108,965	D
Common Stock	10/05/2026		S⁽⁵⁾		1,797	D	$67.2861⁽⁷⁾	107,168	D
Common Stock	10/05/2026		S⁽⁵⁾		800	D	$68.0757⁽⁸⁾	106,368	D
Common Stock	10/05/2026		S⁽⁵⁾		100	D	$69.51	106,268	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. This sale reported on this Form 4 was effected pursuant to the Issuer's policy requiring sell-to-cover to satisfy certain tax obligations of the Reporting Person incurred with the vesting and settlement of certain restricted stock units.

2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $68.41 to $69.40 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 $69.41 to $70.16 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. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $71.50 to $72.26 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.

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

6. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $65.90 to $66.89 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.

7. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $66.90 to $67.85 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.

8. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $67.93 to $68.17 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.

	/s/ Jeffrey Winzeler, Attorney-in-Fact	10/06/2026
	** 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)

Source: View Original Filing on SEC EDGAR