Transaction · 0002078559-26-000014

Chen Sean Chihhsiang

Chen Sean Chihhsiang, PRES, reported an open-market or private sale at Ambiq Micro, Inc. involving 302.000000 shares for an estimated $21701.48. Reported holdings after the transaction were 114473.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SPRES
AMBQAmbiq Micro, Inc.
Filing timeOct 06
Trade dateOct 02, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position traded0.26%Shares sold ÷ (holdings after + shares sold). Estimated position before: 114,775 shares.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$63.24
Pre-filing
1mo ago -9.4%1w ago +10.4%1d ago +9.3%
Returns since
7d30d90d180d1y

AMBQ price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
AMBQ since 2026-10-06Filed yesterday · 1 day of post-filing data
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0002078559-26-000014
Common Stock
Transaction date
Oct 02, 2026
Filed Oct 06, 2026, 10:45 PM · 4d delay
Shares
302 sh
$71.86 per share
Estimated value
-$21.7k
Computed from shares × price
Holdings after
114k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Direct Ownership Repeat Seller 10b5-1 Detected
-4score
Filing-only score

-4

Compact filing score computed from stored Form 4 facts. Version v1.

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

President and COO

Officer YesDirector No10% NoOther No
Footnotes & amended
  1. 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 settleme…

  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 $68.41 to $69.40 per share. The Reporting Person undertakes to p…

  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 $69.41 to $70.16 per share. The Reporting Person undertakes to p…

  4. 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 p…

  5. F5

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

  6. 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 p…

  7. 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 p…

  8. 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 p…

Original filing · 0002078559-26-000014
Related transactions

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Same reporting owner
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