Transaction · 0002078559-26-000016

Chen Sean Chihhsiang

Chen Sean Chihhsiang, PRES, reported a transaction classified as exercise at Ambiq Micro, Inc. involving 15000.000000 shares for an estimated $121800.00. Reported holdings after the transaction were 121268.000000 shares. The stored filing text includes a detected 10b5-1 reference.

exerciseSEC transaction code MPRES
AMBQAmbiq Micro, Inc.
Trade date
Oct 14, 2026
Filing date
Oct 16, 2026
View on SEC Insider profile
Estimated value$121kShares × reported price
Shares traded15.0k$8.12 per share
Holdings after121kDirect
% of reported position tradedUnavailableThis security and ownership context
How reported position traded is calculated

Calculated only for code-P purchases and code-S sales.

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.

AMBQ price since this filing

Daily closing prices, with the filing date and available return windows
AMBQ · Daily closing priceLoading daily prices…
Filing dateReturn windows appear as prices become available.
Pre-filing1mo ago +19.5%1w ago +24.3%1d ago +12.0%
Returns since7d30d90d180d1y

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
exercise
Code M
Identifier
0002078559-26-000016
Common Stock
Transaction date
Oct 14, 2026
Filed Oct 16, 2026, 08:51 PM · 2d delay
Shares
15,000 sh
$8.12 per share
Estimated value
$121k
Computed from shares × price
Holdings after
121,268 sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

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

0 points

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.

How this score is calculated
  • direct_ownership+6 points

    direct_or_indirect_ownership = D

    Direct ownership reports the insider's personal stake.
  • timely_filing+4 points

    reporting_delay_days = 2

    Filing reported within two business days of the transaction.
  • tenb5_1_detected-10 points

    is_10b5_1 = true

    Stored filing content includes detected 10b5-1 language.
Read the scoring methodology

Signed filing-only points, not a probability or expected return. Version v1.

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

    The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on June 5, 2026

  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 $50.00 to $50.98 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 $51.00 to $51.90 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 $52.02 to $53.01 per share. The Reporting Person undertakes to p…

  5. F5

    The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $53.04 to $53.91 per share. The Reporting Person undertakes to p…

  6. F6

    1/4 of the shares subject to the option vested on February 21, 2020, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's con…

Original filing · 0002078559-26-000016
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