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AMBQ Insider Trading & Form 4 Activity

Ambiq Micro, Inc.
Last filing: Oct 16, 2026·7 days ago
BEARISH · LAST 90 DAYS
0%
buyers
$0
0 buys
$6.1M
15 sells
-$6.1M
net selling
4
insiders
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ACTIVE SELLING CLUSTER

3 insiders sold a combined $2.1M of AMBQ on Oct 2, 2026.

Hanson Scott Mclean, Winzeler Jeffrey G, Esaka Fumihide

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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
—
$12.4M
-$12.4M
Hanson Scott Mclean
Chief Technology Officer
—
$5.1M
-$5.1M
Chen Sean Chihhsiang
President and COO
—
$3.5M
-$3.5M
Zhang Ker
Director
—
$645K
-$645K
Winzeler Jeffrey G
Chief Financial Officer
—
$380K
-$380K

Recent transactions

Every Form 4 transaction for AMBQ, newest first.

SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
500 sh @ $49.13
$25K
EXERCISE10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
5,000 sh @ $8.12
$41K
SELL10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
1,800 sh @ $51.86
$93K
SELL10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
3,700 sh @ $51.12
$189K
SELL10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
900 sh @ $50.08
$45K
SELL10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
600 sh @ $49.06
$29K
EXERCISE10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
7,000 sh @ $8.12
$57K
SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
1,200 sh @ $51.85
$62K
SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Oct 15·Filed Oct 16·EDGAR ↗
2,800 sh @ $51.15
$143K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 14·Filed Oct 16·EDGAR ↗
4,000 sh @ $53.44
$214K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 14·Filed Oct 16·EDGAR ↗
1,261 sh @ $51.53
$65K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 14·Filed Oct 16·EDGAR ↗
7,539 sh @ $50.13
$378K
EXERCISE10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 14·Filed Oct 16·EDGAR ↗
15,000 sh @ $8.12
$122K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 14·Filed Oct 16·EDGAR ↗
200 sh @ $54.27
$11K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 14·Filed Oct 16·EDGAR ↗
2,000 sh @ $52.47
$105K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 5·Filed Oct 6·EDGAR ↗
100 sh @ $69.51
$7K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 5·Filed Oct 6·EDGAR ↗
1,797 sh @ $67.29
$121K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 5·Filed Oct 6·EDGAR ↗
5,508 sh @ $66.38
$366K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 5·Filed Oct 6·EDGAR ↗
800 sh @ $68.08
$54K
SELL
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
3,728 sh @ $69.11
$258K
SELL
Winzeler Jeffrey G · Chief Financial Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
2,828 sh @ $69.77
$197K
SELL
Winzeler Jeffrey G · Chief Financial Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
2,343 sh @ $69.11
$162K
SELL
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
452 sh @ $71.86
$32K
SELL
Hanson Scott Mclean · Chief Technology Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
4,500 sh @ $69.77
$314K
SELL
Winzeler Jeffrey G · Chief Financial Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
284 sh @ $71.86
$20K
SELL
Esaka Fumihide · Chief Executive Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
862 sh @ $71.86
$62K
SELL
Esaka Fumihide · Chief Executive Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
8,585 sh @ $69.77
$599K
SELL
Esaka Fumihide · Chief Executive Officer
Tx Oct 2·Filed Oct 6·EDGAR ↗
7,113 sh @ $69.11
$492K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 2·Filed Oct 6·EDGAR ↗
302 sh @ $71.86
$22K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 2·Filed Oct 6·EDGAR ↗
3,008 sh @ $69.77
$210K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Oct 2·Filed Oct 6·EDGAR ↗
2,492 sh @ $69.11
$172K
EXERCISE10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Sep 15·Filed Sep 17·EDGAR ↗
7,000 sh @ $8.12
$57K
SELL10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Sep 15·Filed Sep 17·EDGAR ↗
100 sh @ $61.00
$6K
SELL10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Sep 15·Filed Sep 17·EDGAR ↗
4,947 sh @ $60.56
$300K
SELL10b5-1
Hanson Scott Mclean · Chief Technology Officer
Tx Sep 15·Filed Sep 17·EDGAR ↗
1,953 sh @ $59.53
$116K
SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Sep 15·Filed Sep 15·EDGAR ↗
100 sh @ $61.00
$6K
EXERCISE10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Sep 15·Filed Sep 15·EDGAR ↗
13,500 sh @ $8.12
$110K
SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Sep 15·Filed Sep 15·EDGAR ↗
3,785 sh @ $59.56
$225K
SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Sep 15·Filed Sep 15·EDGAR ↗
9,615 sh @ $60.55
$582K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Sep 14·Filed Sep 15·EDGAR ↗
2,600 sh @ $59.36
$154K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Sep 14·Filed Sep 15·EDGAR ↗
1,400 sh @ $60.83
$85K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Sep 14·Filed Sep 15·EDGAR ↗
11,000 sh @ $60.24
$663K
EXERCISE10b5-1
Chen Sean Chihhsiang · President and COO
Tx Sep 14·Filed Sep 15·EDGAR ↗
15,000 sh @ $8.12
$122K
SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Sep 11·Filed Sep 15·EDGAR ↗
42,083 sh @ $63.27
$2.7M
EXERCISE10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Sep 11·Filed Sep 15·EDGAR ↗
50,000 sh @ $12.60
$630K
SELL
Zhang Ker · Director
Tx Sep 11·Filed Sep 15·EDGAR ↗
9,100 sh @ $63.39
$577K
SELL
Zhang Ker · Director
Tx Sep 11·Filed Sep 15·EDGAR ↗
900 sh @ $63.95
$58K
SELL10b5-1
Esaka Fumihide · Chief Executive Officer
Tx Sep 11·Filed Sep 15·EDGAR ↗
7,917 sh @ $63.86
$506K
SELL10b5-1
Chen Sean Chihhsiang · President and COO
Tx Sep 4·Filed Sep 9·EDGAR ↗
2,126 sh @ $57.68
$123K
EXERCISE10b5-1
Chen Sean Chihhsiang · President and COO
Tx Sep 4·Filed Sep 9·EDGAR ↗
15,000 sh @ $8.12
$122K

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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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