Transaction · 0002078559-26-000016
AMBQAmbiq Micro, Inc.
Chen Sean Chihhsiang
Chen Sean Chihhsiang, PRES, reported an open-market or private sale at Ambiq Micro, Inc. involving 200.000000 shares for an estimated $10854.00. Reported holdings after the transaction were 106268.000000 shares. The stored filing text includes a detected 10b5-1 reference.
Open-market sellSEC transaction code SPRES
- Trade date
- Oct 14, 2026
- Filing date
- Oct 16, 2026
How reported position traded is calculated
Shares sold ÷ (holdings after + shares sold). Estimated position before: 106,468 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.
AMBQ price since this filing
Daily closing prices, with the filing date and available return windowsAMBQ · 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
- Type
- Sell Code S
- Identifier
- 0002078559-26-000016 Common Stock
- Transaction date
- Oct 14, 2026 Filed Oct 16, 2026, 08:51 PM · 2d delay
- Shares
- 200 sh $54.27 per share
- Estimated value
- -$10.8k Computed from shares × price
- Holdings after
- 106,268 sh Direct
Filing signal explanations
Badges describe filing facts only — not predictions.
Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Cluster Selling Direct Ownership Repeat Seller 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.
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
- F1
The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on June 5, 2026
- 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…
- 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…
- 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…
- 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…
- 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…
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