Sean Chihhsiang Chen

CIK: 0002078559

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)19 (76.0%)

Position reduction

Option Exercises (M)4 (16.0%)

Derivative conversions

Awards (A)2 (8.0%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

AMBQ

Ambiq Micro, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (25 total)

AMBQ
Ambiq Micro, Inc.
Oct 14, 2026
Exercise(M)
Direct
15K shares at avg. $8.12$122K
AMBQ
Ambiq Micro, Inc.
Oct 14, 2026
Sale(S)
Direct
7.5K shares at avg. $50.13$378K
AMBQ
Ambiq Micro, Inc.
Oct 14, 2026
Sale(S)
Direct
1.3K shares at avg. $51.53$65K
AMBQ
Ambiq Micro, Inc.
Oct 14, 2026
Sale(S)
Direct
2K shares at avg. $52.47$105K
AMBQ
Ambiq Micro, Inc.
Oct 14, 2026
Sale(S)
Direct
4K shares at avg. $53.44$214K
AMBQ
Ambiq Micro, Inc.
Oct 14, 2026
Sale(S)
Direct
200 shares at avg. $54.27$11K
AMBQ
Ambiq Micro, Inc.
Oct 5, 2026
Sale(S)
Direct
100 shares at avg. $69.51$7K
AMBQ
Ambiq Micro, Inc.
Oct 5, 2026
Sale(S)
Direct
5.5K shares at avg. $66.38$366K
AMBQ
Ambiq Micro, Inc.
Oct 5, 2026
Sale(S)
Direct
1.8K shares at avg. $67.29$121K
AMBQ
Ambiq Micro, Inc.
Oct 5, 2026
Sale(S)
Direct
800 shares at avg. $68.08$54K
AMBQ
Ambiq Micro, Inc.
Oct 2, 2026
Sale(S)
Direct
3K shares at avg. $69.77$210K
AMBQ
Ambiq Micro, Inc.
Oct 2, 2026
Sale(S)
Direct
302 shares at avg. $71.86$22K
AMBQ
Ambiq Micro, Inc.
Oct 2, 2026
Sale(S)
Direct
2.5K shares at avg. $69.11$172K
AMBQ
Ambiq Micro, Inc.
Sep 14, 2026
Sale(S)
Direct
1.4K shares at avg. $60.83$85K
AMBQ
Ambiq Micro, Inc.
Sep 14, 2026
Exercise(M)
Direct
15K shares at avg. $8.12$122K
AMBQ
Ambiq Micro, Inc.
Sep 14, 2026
Sale(S)
Direct
2.6K shares at avg. $59.36$154K
AMBQ
Ambiq Micro, Inc.
Sep 14, 2026
Sale(S)
Direct
11K shares at avg. $60.24$663K
AMBQ
Ambiq Micro, Inc.
Sep 4, 2026
Exercise(M)
Direct
15K shares at avg. $8.12$122K
AMBQ
Ambiq Micro, Inc.
Sep 4, 2026
Sale(S)
Direct
12.9K shares at avg. $57.09$735K
AMBQ
Ambiq Micro, Inc.
Sep 4, 2026
Sale(S)
Direct
2.1K shares at avg. $57.68$123K
AMBQ
Ambiq Micro, Inc.
May 15, 2026
Sale(S)
Direct
23.3K shares at avg. $71.37$1.7M
AMBQ
Ambiq Micro, Inc.
May 15, 2026
Exercise(M)
Direct
55.7K shares at avg. $5.88$327K
AMBQ
Ambiq Micro, Inc.
May 15, 2026
Sale(S)
Direct
32.4K shares at avg. $70.53$2.3M
AMBQ
Ambiq Micro, Inc.
Mar 6, 2026
Award(A)
Direct
64.2K shares-
AMBQ
Ambiq Micro, Inc.
Oct 2, 2025
Award(A)
Direct
56K shares-

		Type	Shares	Price		Ownership
Oct 14, 2026	AMBQ Ambiq Micro, Inc.	Exercise(M)	15,000	$8.12	$121,800	Direct
Oct 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	7,539	$50.13	$377,923	Direct
Oct 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	1,261	$51.53	$64,980	Direct
Oct 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	2,000	$52.47	$104,936	Direct
Oct 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	4,000	$53.44	$213,745	Direct
Oct 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	200	$54.27	$10,854	Direct
Oct 5, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	100	$69.51	$6,951	Direct
Oct 5, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	5,508	$66.38	$365,625	Direct
Oct 5, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	1,797	$67.29	$120,913	Direct
Oct 5, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	800	$68.08	$54,461	Direct
Oct 2, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	3,008	$69.77	$209,875	Direct
Oct 2, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	302	$71.86	$21,701	Direct
Oct 2, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	2,492	$69.11	$172,218	Direct
Sep 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	1,400	$60.83	$85,166	Direct
Sep 14, 2026	AMBQ Ambiq Micro, Inc.	Exercise(M)	15,000	$8.12	$121,800	Direct
Sep 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	2,600	$59.36	$154,346	Direct
Sep 14, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	11,000	$60.24	$662,618	Direct
Sep 4, 2026	AMBQ Ambiq Micro, Inc.	Exercise(M)	15,000	$8.12	$121,800	Direct
Sep 4, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	12,874	$57.09	$734,933	Direct
Sep 4, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	2,126	$57.68	$122,625	Direct
May 15, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	23,334	$71.37	$1,665,455	Direct
May 15, 2026	AMBQ Ambiq Micro, Inc.	Exercise(M)	55,685	$5.88	$327,428	Direct
May 15, 2026	AMBQ Ambiq Micro, Inc.	Sale(S)	32,351	$70.53	$2,281,826	Direct
Mar 6, 2026	AMBQ Ambiq Micro, Inc.	Award(A)	64,246	-	$0	Direct
Oct 2, 2025	AMBQ Ambiq Micro, Inc.	Award(A)	56,029	-	-	Direct

1-25 of 25 transactions

About Chen Sean Chihhsiang

Chen Sean Chihhsiang (SEC CIK 0002078559) files insider reports with the SEC as President and COO of Ambiq Micro, Inc. (AMBQ).

Signal8 holds 9 ownership filings by Chen Sean Chihhsiang (1 Form 3, 8 Form 4), filed between Jul 29, 2025 and Oct 16, 2026. Those filings report 25 transactions, from Oct 2, 2025 to Oct 14, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Chen Sean Chihhsiang's filings is in AUSTIN, TX.

Recent filings by Chen Sean Chihhsiang

Oct 14, 2026: Option exercise of AMBQ shares (Form 4, code M).
Oct 14, 2026: Open-market sales of AMBQ shares (5 lines, Form 4, code S).
Oct 5, 2026: Open-market sales of AMBQ shares (4 lines, Form 4, code S).
Oct 2, 2026: Open-market sales of AMBQ shares (3 lines, Form 4, code S).
Sep 14, 2026: Open-market sale of AMBQ shares (Form 4, code S).

Other insiders filing for Ambiq Micro, Inc. (AMBQ)

Hanson Scott McLean, Chief Technology Officer
Esaka Fumihide, Chief Executive Officer
Winzeler Jeffrey G, Chief Financial Officer
ZHANG KER, Director
HSIEH Wen Hsuan, Director
Chen Timothy, Director

How to read Form 4 transaction codes