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Who

Fumihide Esaka

Chief Executive Officer

Company insider

Files Form 4 as: Chief Executive Officer, Ambiq Micro.

Every Form 4 they filed

In numbers

Trades disclosed
100
Buys
0
Sells
9
Bought
$0
Sold
$31.9M
Companies
1
Companies where not an officer
0
First trade
2 Oct 2025
Last trade
15 Oct 2026
Last filed
16 Oct 2026

Companies traded

Where they are an officer
AMBQ Ambiq MicroDirector, Officer · Semiconductors · last 15 Oct 20260 buys · 9 sells

Activity over time

1 May – 1 Oct
40May 26Jun 26Aug 26Sep 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
15 Oct 2026filed 16 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Code M$41K5,000 at $8.12filing
15 Oct 2026filed 16 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$25K500 at $49.13filing
15 Oct 2026filed 16 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$25K500 at $50.02filing
15 Oct 2026filed 16 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$143K2,800 at $51.15filing
15 Oct 2026filed 16 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$62K1,200 at $51.85filing
15 Oct 2026filed 16 Oct 2026AMBQ Ambiq Microoption or derivative · SemiconductorsSEC FORM 4 Code M—5,000 at $0.00filing
2 Oct 2026filed 6 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$492K7,113 at $69.11filing
2 Oct 2026filed 6 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$599K8,585 at $69.77filing
2 Oct 2026filed 6 Oct 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$62K862 at $71.86filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq Microoption or derivative · SemiconductorsSEC FORM 4 Code M—13,500 at $0.00filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq Microoption or derivative · SemiconductorsSEC FORM 4 Code M—13,500 at $0.00filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Code M$110K13,500 at $8.12filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$225K3,785 at $59.56filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$582K9,615 at $60.55filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$6,100100 at $61.00filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Code M$110K13,500 at $8.12filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$225K3,785 at $59.56filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$582K9,615 at $60.55filing
15 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Sold$6,100100 at $61.00filing
11 Sep 2026filed 15 Sep 2026AMBQ Ambiq MicroSemiconductorsSEC FORM 4 Code M$630K50,000 at $12.60filing

Sectors

Technology9

Buys in green, sells in red, by the company’s sector.

Related people

Scott McLean HansonChief Technology Officer · Chief Technology Officer at Ambiq Micro, filing Form 4 there in the last year
Sean Chihhsiang ChenPresident and COO · President and COO at Ambiq Micro, filing Form 4 there in the last year
Jeffrey G. WinzelerChief Financial Officer · Chief Financial Officer at Ambiq Micro, filing Form 4 there in the last year
Ker ZhangDirector · Director at Ambiq Micro, filing Form 4 there in the last year
Wen Hsuan HsiehDirector · Director at Ambiq Micro, filing Form 4 there in the last year