Chen Sean Chihhsiang

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other

Notification date	Transaction date	Company	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value
2026-05-18	2026-05-15	Ambiq Micro Inc (AMBQ)	S Sale	93,800 +48.9% 254.58 US$1,850,237	93,800 +48.9%	254.58	US$1,850,237
2026-05-18	2026-05-15	Ambiq Micro Inc (AMBQ)	S Sale	75,058 -10.1% 428.61 US$3,208,558	75,058 -10.1%	428.61	US$3,208,558
2026-05-15	2026-05-15	Ambiq Micro Inc (AMBQ)	PrS Proposed sale	13,317 264.55 US$594,689	13,317	264.55	US$594,689