Timothy Chen - 29 Jul 2025 Form 4/A - Amendment Insider Report for Ambiq Micro, Inc. (AMBQ)

Reporting relationship: Director
Issuer ticker: AMBQ
Reported as of: 29 Jul 2025
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 29 May 2026, 19:49:21 UTC
Original report date: 31 Jul 2025
Next SEC filing: 29 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Jeffrey Winzeler, Attorney-in-Fact

Key filing fact

Timothy Chen filed Form 4/A - Amendment for Ambiq Micro, Inc. (AMBQ) on 29 May 2026.

Key facts

This page summarizes Timothy Chen's Form 4/A - Amendment filing for Ambiq Micro, Inc. (AMBQ).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 29 May 2026, 19:49.

Change

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

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/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001818099 Primary reporting owner

Chen Timothy

Relationship: Director
Address: C/O AMBIQ MICRO, INC., 6500 RIVER PLACE BLVD., BUILDING 7 SUITE, AUSTIN
Signature: /s/ Jeffrey Winzeler, Attorney-in-Fact
Signature date: 29 May 2026

Reported non-derivative transactions

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

AMBQ transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +70,592
Change %
Price
Shares after: 70,592
Date: 31 Jul 2025
Ownership: By: Triumph Way Investment Inc.
Footnotes: F1, F2

Reported derivative securities

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

AMBQ transaction Derivative

Series F-1 Convertible Preferred Stock

Conversion of derivative security

Transaction value
Shares: -1,707,853
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 31 Jul 2025
Ownership: By: Triumph Way Investment Inc.
Underlying class: Common Stock
Underlying amount: 70,592
Exercise price
Footnotes: F1, F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

The Series F-1 Convertible Preferred Stock automatically converted into Common Stock immediately prior to the closing of the Issuer's initial public offering of common stock and had no expiration date.

Footnote F2

The Reporting Person exercises sole voting and dispositive control over the shares held by Triumph Way Investment Inc.

SEC remarks

This Form 4 is being amended solely to include the reported transaction affecting the indirectly held stock reported herein that was previously inadvertently omitted from the Form 4.