Sean Chihhsiang Chen - 15 May 2026 Form 4 Insider Report for Ambiq Micro, Inc. (AMBQ)

Reporting relationship: President and COO
Issuer ticker: AMBQ
Reported as of: 15 May 2026
Net transaction value: -$3,947,281
SEC form: 4
Accepted by SEC: 18 May 2026, 17:48:44 UTC
Prior SEC filing: 02 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Jeffrey Winzeler, Attorney-in-Fact

Key filing fact

Sean Chihhsiang Chen filed Form 4 for Ambiq Micro, Inc. (AMBQ) on 18 May 2026.

Key facts

This page summarizes Sean Chihhsiang Chen's Form 4 filing for Ambiq Micro, Inc. (AMBQ).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 18 May 2026, 17:48.

Change

Previous filing in this sequence was filed on 02 Apr 2026.
Current net transaction value: -$3,947,281.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002078559 Primary reporting owner

Chen Sean Chihhsiang

Relationship: President and COO
Address: C/O AMBIQ MICRO, INC., 6500 RIVER PLACE BLVD BUILDING 7 STE 200, AUSTIN
Signature: /s/ Jeffrey Winzeler, Attorney-in-Fact
Signature date: 18 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMBQ transaction

Common Stock

Options Exercise

Transaction value
Shares: +55,685
Change %: +46%
Price: $5.88^*
Shares after: 175,960
Date: 15 May 2026
Ownership: Direct

AMBQ transaction

Common Stock

Sale

Transaction value: $2,281,826
Shares: -32,351
Change %: -18%
Price: $70.53
Shares after: 143,609
Date: 15 May 2026
Ownership: Direct
Footnotes: F1

AMBQ transaction

Common Stock

Sale

Transaction value: $1,665,455
Shares: -23,334
Change %: -16%
Price: $71.37
Shares after: 120,275
Date: 15 May 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AMBQ transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -55,685
Change %: -100%
Price: $0.000000^*
Shares after: 1
Date: 15 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 55,685
Exercise price: $5.88
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $70.02 to $71.0097 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.

Footnote F2

The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $71.025 to $71.85 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.

Footnote F3

1/4 of the shares subject to the option vested on November 3, 2017, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.