Ambiq Micro AMBQ Insider Ownership

NYSE AMBQ

$50.32 +0.66 (+1.33%)

At close: Oct 23, 2026 · 4:00 PM EDT

Insider Holdings by Owner

2.55Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

13.37%

▲+0.045% pp QoQ

Shares Held by Insiders

3.23Mn

filed for Sep 2026

▲+0.34% QoQ

Shares Outstanding

24.15Mn

24,146,260 shares

Direct Holdings

1.11Mn

Indirect: 2.12Mn

Net Shares Traded (QoQ)

+10.87K

net buying in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 21, 2026

In the last 12 months, insiders at Ambiq Micro made open-market sales of $38.93 million (607.38K shares) and bought no shares on the open market.

Behind Ambiq Micro's open-market sales in the past 12 months were 8 insiders, and no insider bought.
Fumihide Esaka (Chief Executive Officer) led open-market sales of Ambiq Micro stock over the past 12 months with $16.63 million (266.96K shares), most recently on October 15, 2026.
The latest open-market trade on record is a sale of 7K shares for $357,008 by Scott McLean Hanson (Chief Technology Officer) on October 15, 2026.
Beyond open-market trades, insiders at Ambiq Micro received 413.22K shares in stock awards and acquired 803.38K shares through option exercises and conversions in the last 12 months.
According to Business Quant data, insiders at Ambiq Micro reported 3.18Mn shares in total in their latest Form 4 filings, down 1.05% from 3.22Mn shares at the end of Q2 2026 and up 58.23% from 2.01Mn shares at the end of Q3 2025.
Ambiq Micro insiders hold 1.06Mn shares directly (33.32% of their total) and 2.12Mn shares (66.68%) indirectly, through entities such as trusts and partnerships.
Holdings in Ambiq Micro stock are reported by 11 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
AMBQ's three largest insider shareholders, per their latest Form 4 filings, are KPCB Xvi Associates, LLC (10% owner, 1.49Mn shares), Wen Hsuan Hsieh (Director, 638.88K shares) and Fumihide Esaka (Chief Executive Officer, 443.9K shares).
The largest insider, KPCB Xvi Associates, LLC, holds 46.77% of AMBQ's insider total.
Institutions owned 71.40% of AMBQ shares as of Q2 2026; insiders' latest Form 4 filings account for about 13.18%, leaving roughly 15.42% with other investors, including the public.
In the last 12 months, 43 Form 4 filings with transactions in AMBQ stock came from 10 insiders.
Insider figures for AMBQ include Form 4 filings through October 16, 2026.

Form 4 Holdings

Insiders Holding AMBQ

Insiders 11

Shares held 2.55Mn

Of outstanding 10.56%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Xvi Associates, Llc Kpcb	TenPercentOwner	0	1,488,949	1,488,949	58.4%	31 Jul, 2025
2	Fumihide Esaka	Chief Executive Officer	443,900	0	443,900	17.4%	16 Oct, 2026
3	Scott Mclean Hanson	Chief Technology Officer	212,546	0	212,546	8.3%	16 Oct, 2026
4	Sean Chihhsiang Chen	President And Coo	106,268	0	106,268	4.2%	16 Oct, 2026
5	Jeffrey G Winzeler	Chief Financial Officer	100,844	0	100,844	4.0%	06 Oct, 2026
6	Michele Kim Connors	General Counsel	60,554	0	60,554	2.4%	06 Apr, 2026
7	Joseph A Tautges	Director	53,703	0	53,703	2.1%	10 Jun, 2026
8	Timothy Chen	Director	52,575	0	52,575	2.1%	10 Jun, 2026
9	Ker Zhang	Director	20,366	0	20,366	0.8%	15 Sep, 2026
10	Bernard Bennett Banks	Director	4,957	0	4,957	0.2%	10 Jun, 2026
11	Wen Hsuan Hsieh	Director	4,957	0	4,957	0.2%	10 Jun, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

172 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
15 Oct, 2026	Fumihide Esaka	Chief Executive Officer	Acquired M	5,000	$8.12	$40.60K	448,900	Direct
14 Oct, 2026	Sean Chihhsiang Chen	President And Coo	Acquired M	15,000	$8.12	$121.80K	121,268	Direct
15 Oct, 2026	Scott Mclean Hanson	Chief Technology Officer	Acquired M	7,000	$8.12	$56.84K	219,546	Direct
14 Oct, 2026	Sean Chihhsiang Chen	President And Coo	Disposed S	7,539	$50.13	$377.92K	113,729	Direct
15 Oct, 2026	Fumihide Esaka	Chief Executive Officer	Disposed S	500	$49.13	$24.57K	448,400	Direct
15 Oct, 2026	Scott Mclean Hanson	Chief Technology Officer	Disposed S	600	$49.06	$29.44K	218,946	Direct
15 Oct, 2026	Scott Mclean Hanson	Chief Technology Officer	Disposed S	900	$50.08	$45.07K	218,046	Direct
15 Oct, 2026	Fumihide Esaka	Chief Executive Officer	Disposed S	500	$50.02	$25.01K	447,900	Direct
14 Oct, 2026	Sean Chihhsiang Chen	President And Coo	Disposed S	1,261	$51.53	$64.98K	112,468	Direct
15 Oct, 2026	Scott Mclean Hanson	Chief Technology Officer	Disposed S	3,700	$51.12	$189.15K	214,346	Direct
15 Oct, 2026	Fumihide Esaka	Chief Executive Officer	Disposed S	2,800	$51.15	$143.21K	445,100	Direct
14 Oct, 2026	Sean Chihhsiang Chen	President And Coo	Disposed S	2,000	$52.47	$104.94K	110,468	Direct
15 Oct, 2026	Fumihide Esaka	Chief Executive Officer	Disposed S	1,200	$51.85	$62.23K	443,900	Direct
14 Oct, 2026	Sean Chihhsiang Chen	President And Coo	Disposed S	4,000	$53.44	$213.75K	106,468	Direct
15 Oct, 2026	Scott Mclean Hanson	Chief Technology Officer	Disposed S	1,800	$51.86	$93.35K	212,546	Direct
14 Oct, 2026	Sean Chihhsiang Chen	President And Coo	Disposed S	200	$54.27	$10.85K	106,268	Direct
15 Oct, 2026	Fumihide Esaka	Chief Executive Officer	Disposed M	5,000	$0.00	$0	53,507	Direct
15 Oct, 2026	Scott Mclean Hanson	Chief Technology Officer	Disposed M	7,000	$0.00	$0	38,279	Direct
14 Oct, 2026	Sean Chihhsiang Chen	President And Coo	Disposed M	15,000	$0.00	$0	119,423	Direct
02 Oct, 2026	Fumihide Esaka	Chief Executive Officer	Disposed S	7,113	$69.11	$491.57K	453,347	Direct

Showing 1 to 20 of 172 transactions