Ambiq director sells 10,000 shares at ~$63

Ambiq Micro, Inc. (AMBQ) director Ker Zhang reported selling a total of 10,000 shares of common stock on September 11, 2026 in open-market or private transactions.

Rhea-AI Filing Summary

Ambiq Micro, Inc. (AMBQ) director Ker Zhang reported selling a total of 10,000 shares of common stock on September 11, 2026 in open-market or private transactions. The sales consisted of 9,100 shares at a weighted average price of $63.3856 and 900 shares at a weighted average price of $63.9467, each executed in multiple trades within disclosed price ranges. No Rule 10b5-1 trading plan is reported for these transactions.

Insider Trade Summary

Net Seller: 10,000 shares

Net Sell 2 txns

Insider ZHANG KER

Role Director

Sold 10,000 shs ($634K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	9,100	$63.3856	$577K
Sale	Common Stock F2	900	$63.9467	$58K

Holdings After Transaction: Common Stock — 20,366 shares (Direct)

Footnotes (2)

1. F1. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.85 to $63.84 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.
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 $63.87 to $64.05 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 (first transaction): 9,100 shares Weighted average price (first transaction): $63.3856 per share Shares sold (second transaction): 900 shares +4 more

7 metrics

Shares sold (first transaction) 9,100 shares Common stock sold by director on September 11, 2026

Weighted average price (first transaction) $63.3856 per share 9,100-share sale on September 11, 2026

Shares sold (second transaction) 900 shares Common stock sold by director on September 11, 2026

Weighted average price (second transaction) $63.9467 per share 900-share sale on September 11, 2026

Total shares sold 10,000 shares Aggregate common stock sales reported for September 11, 2026

Price range (first transaction) $62.85–$63.84 per share Range of prices for 9,100-share sale, reported as weighted average

Price range (second transaction) $63.87–$64.05 per share Range of prices for 900-share sale, reported as weighted average

Key Terms

weighted average sale price, multiple transactions, open market or private transaction

3 terms

weighted average sale price financial

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

multiple transactions financial

"These shares were sold in multiple transactions at prices ranging from..."

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

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

What insider transaction did AMBQ disclose in this Form 4?

The filing reports that director Ker Zhang sold a total of 10,000 shares of Ambiq Micro, Inc. common stock on September 11, 2026 in open-market or private transactions.

How many AMBQ shares did the director sell and at what prices?

The director sold 9,100 shares at a weighted average price of $63.3856 per share and 900 shares at a weighted average price of $63.9467 per share, all on September 11, 2026.

What were the price ranges for the AMBQ share sales?

For the 9,100-share sale, trades occurred between $62.85 and $63.84 per share. For the 900-share sale, trades occurred between $63.87 and $64.05 per share, with the reported prices reflecting weighted averages.

Were the AMBQ insider sales made under a Rule 10b5-1 trading plan?

No. The Form 4 indicates that no Rule 10b5-1 trading plan is reported for these September 11, 2026 transactions.

Does the Form 4 show how many AMBQ shares the director holds after these sales?

No. For each reported sale, the field for shares owned following the transaction is left blank, so the director’s post-transaction holdings are not stated in this Form 4.

Did the AMBQ Form 4 report any derivative securities transactions?

No. The Form 4 reports only non-derivative transactions in common stock and shows no derivative securities transactions or remaining derivative positions in this filing.

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

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Available on EDGAR 09/15/2026 - 06:58 PM Accepted by SEC EDGAR 09/15/2026 - 06:58 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).

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^*

ZHANG KER

(Last) (First) (Middle)

C/O AMBIQ MICRO, INC.

6500 RIVER PLACE BLVD., BLDG 7 SUITE 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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2026

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	09/11/2026		S		9,100	D	$63.3856(1)	21,266	D
Common Stock	09/11/2026		S		900	D	$63.9467(2)	20,366	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. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.85 to $63.84 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.

2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $63.87 to $64.05 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	09/15/2026
	** 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)