20 transactions on file, per SEC Form 4 filings.
See AMBQ superinvestor activity →Chen Sean Chihhsiang
President and COO · 2026-09-04
Option exercise
$122K
Chen Sean Chihhsiang
President and COO · 2026-09-04
Sold
$735K
Chen Sean Chihhsiang
President and COO · 2026-09-04
Sold
$123K
ZHANG KER
director · 2026-09-04
Option exercise
$10K
ZHANG KER
director · 2026-09-04
Sold
$11K
Esaka Fumihide
Chief Executive Officer · 2026-09-02
Option exercise
$139K
Esaka Fumihide
Chief Executive Officer · 2026-09-02
Sold
$82K
Esaka Fumihide
Chief Executive Officer · 2026-09-02
Sold
$544K
Esaka Fumihide
Chief Executive Officer · 2026-09-01
Option exercise
$617K
Esaka Fumihide
Chief Executive Officer · 2026-09-01
Sold
$2.8M
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Option exercise
$110K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Sold
$335K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Sold
$318K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Sold
$123K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Option exercise
$558K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Sold
$886K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Sold
$796K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Sold
$327K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Option exercise
$441K
Esaka Fumihide
Chief Executive Officer · 2026-08-31
Option exercise
$117K
Each row links to the underlying SEC filing. Sells are shown for transparency, not as a signal — see the insider trading article for why.
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