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AMBQ Insider Trading & Form 4 Activity

Ambiq Micro, Inc.
Last filing: Jun 4, 2026·6 days ago
BEARISH · LAST 90 DAYS
0%
buyers
$0
0 buys
$10.7M
8 sells
-$10.7M
net selling
4
insiders
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ACTIVE SELLING CLUSTER

4 insiders sold a combined $10.7M of AMBQ between May 14, 2026 and May 15, 2026.

Esaka Fumihide, Hanson Scott Mclean, Winzeler Jeffrey G, Chen Sean Chihhsiang

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Net flow — last 12 months

Monthly net of insider buys minus sells. Green months indicate net buying; red months indicate net selling.

Most active insiders

Ranked by total transaction value over the last 90 days.

INSIDERBOUGHTSOLDNET
Esaka Fumihide
Chief Executive Officer
$4.2M
-$4.2M
Chen Sean Chihhsiang
President and COO
$3.9M
-$3.9M
Winzeler Jeffrey G
Chief Financial Officer
$1.8M
-$1.8M
Hanson Scott Mclean
Chief Technology Officer
$706K
-$706K

Recent transactions

Every Form 4 transaction for AMBQ, newest first.

EXERCISE
Winzeler Jeffrey G · Chief Financial Officer
Tx Jun 2·Filed Jun 4·EDGAR ↗
5,952 sh @ $16.80
$100K
SELL
Chen Sean Chihhsiang · President and COO
Tx May 15·Filed May 18·EDGAR ↗
32,351 sh @ $70.53
$2.3M
EXERCISE
Winzeler Jeffrey G · Chief Financial Officer
Tx May 15·Filed May 18·EDGAR ↗
5,952 sh @ $16.80
$100K
SELL
Chen Sean Chihhsiang · President and COO
Tx May 15·Filed May 18·EDGAR ↗
23,334 sh @ $71.37
$1.7M
EXERCISE
Chen Sean Chihhsiang · President and COO
Tx May 15·Filed May 18·EDGAR ↗
55,685 sh @ $5.88
$327K
EXERCISE
Esaka Fumihide · Chief Executive Officer
Tx May 15·Filed May 18·EDGAR ↗
45,463 sh @ $8.12
$369K
EXERCISE
Esaka Fumihide · Chief Executive Officer
Tx May 15·Filed May 18·EDGAR ↗
14,537 sh @ $12.60
$183K
EXERCISE
Hanson Scott Mclean · Chief Technology Officer
Tx May 15·Filed May 18·EDGAR ↗
8,100 sh @ $8.12
$66K
SELL
Esaka Fumihide · Chief Executive Officer
Tx May 14·Filed May 18·EDGAR ↗
60,000 sh @ $70.02
$4.2M
EXERCISE
Winzeler Jeffrey G · Chief Financial Officer
Tx May 14·Filed May 18·EDGAR ↗
26,000 sh @ $16.80
$437K
SELL
Hanson Scott Mclean · Chief Technology Officer
Tx May 14·Filed May 18·EDGAR ↗
3,900 sh @ $68.62
$268K
SELL
Hanson Scott Mclean · Chief Technology Officer
Tx May 14·Filed May 18·EDGAR ↗
6,100 sh @ $69.59
$425K
SELL
Hanson Scott Mclean · Chief Technology Officer
Tx May 14·Filed May 18·EDGAR ↗
200 sh @ $70.50
$14K
EXERCISE
Hanson Scott Mclean · Chief Technology Officer
Tx May 14·Filed May 18·EDGAR ↗
10,200 sh @ $8.12
$83K
SELL
Winzeler Jeffrey G · Chief Financial Officer
Tx May 14·Filed May 18·EDGAR ↗
25,918 sh @ $69.90
$1.8M
SELL
Winzeler Jeffrey G · Chief Financial Officer
Tx May 14·Filed May 18·EDGAR ↗
82 sh @ $70.65
$6K
EXERCISE
Esaka Fumihide · Chief Executive Officer
Tx May 14·Filed May 18·EDGAR ↗
60,000 sh @ $8.12
$487K

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About AMBQ insider trading data

Form 4 is the SEC filing required when an officer, director, or 10% owner of a public company buys or sells the company's stock. By law, these filings must be submitted within two business days of the trade. Tracenotes pulls every Form 4 filing for AMBQ from EDGAR, parses it, and surfaces the activity on this page.

What insider buying tells you. Open-market purchases by insiders are widely studied as a meaningful signal. Unlike stock awards (which are compensation, not conviction), an executive spending their own money to buy shares of the company they run is a vote of confidence. Studies have found insider-buying clusters — three or more insiders buying within a short window — outperform the broader market over the following year.

What insider selling tells you. Selling is noisier. Many sales are pre-scheduled under SEC Rule 10b5-1 plans, which let insiders sell on a fixed schedule regardless of company news. We label these "10b5-1" so you can see them. Discretionary sales — sales not tied to a plan — are more meaningful, especially when multiple insiders sell in quick succession.

Tracenotes methodology. We scan EDGAR daily for new Form 4 filings, parse them into individual transactions, and detect clusters when three or more distinct insiders buy or sell within a 14-day window. The data on this page covers the last 12 months. For deeper analysis, Tracenotes also runs language-change detection on 10-K and 10-Q filings — that's our core product.

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Frequently asked questions

What is a Form 4 filing?

Form 4 is the SEC disclosure required when a company insider — an officer, director, or 10% owner — buys or sells the company's stock. By law these filings must be submitted within two business days of the trade.

Is insider buying AMBQ always bullish?

Open-market purchases by insiders are widely viewed as a bullish signal because executives are spending their own money. Stock awards and option exercises are part of compensation and don't carry the same weight, which is why we treat them separately on this page.

What is a 10b5-1 trade?

A trade made under SEC Rule 10b5-1, which lets insiders pre-schedule sales weeks or months in advance. These sales execute on a fixed plan regardless of company news, so they're a weaker signal than discretionary sales. We label them with a "10b5-1" tag.

What is an insider cluster?

A cluster is when three or more distinct insiders buy or sell within a 14-day window. Clusters are studied as stronger signals than single trades because multiple people independently reach the same view. We surface active clusters on Ambiq Micro, Inc. (AMBQ) when they form.

Where does AMBQ insider trading data come from?

Every Form 4 filing for AMBQ is sourced directly from SEC EDGAR. Tracenotes scans EDGAR daily, parses each Form 4 into individual transactions, and updates this page within hours of new filings.

Nothing on this page constitutes investment advice. Form 4 data is sourced from SEC EDGAR and provided for research purposes only.

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