$AMBQ

$51.06 +$0.70 (1.39%) Close

$AMBQ Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 24.2M shares outstanding

Who owns AMBQ?

By type of holder

Institutions 71.3% Insiders 18.0% Everyone else 10.7%

Concentration Top 10 holders own 33.5%

BlackRock, Inc. 5.7% · T. Rowe Price Investment Management, Inc. 4.2%

Institutional ownership

71.3%

+25.8 pts vs last qtr

Institutional holders

183

+86 vs last qtr

Net shares bought

+6.2M

by institutions in Q2 2026

New / sold out

97 / 11

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

D. E. Shaw & Co., Inc. NEW +983.9K
Two Sigma Investments, LP +615.0K

Biggest sellers in Q2 2026

Schonfeld Strategic Advisors LLC −341.1K
Franklin Resources Inc −318.5K

Who is planning to sell?

Notices of proposed sale, last 12 months

$40.9M

21 notices from 11 people

Shares covered

618.9K

2.56% of the company

Arranged in advance

23%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Fumihide Esaka Officer $10.3M
Sean Chen Officer $9.27M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+2036.1%

+2036.15% a year

Each share's claim on the business

−95.3%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $12M

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years0% Under 1 year100%

Quarterly turnover

49.3%

of institutional shares changed hands

Top 10 managers, median time held

3 quarters

Super Investors

Investment managers reporting AMBQ on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	1.4M	5.71%	+367.5K (+36.3%)	Q3 '25	0.0%
Shares held by quarter Peak holding1.4M (Q2'26) Change over 8 quarters+1.4M Share of the company5.710% BlackRock, Inc.'s full portfolio →
TR T. Rowe Price Investment Management, Inc.	1.0M	4.16%	−261.2K (−20.6%)	Q1 '26	0.1%
Shares held by quarter Peak holding1.3M (Q1'26) Change over 8 quarters+1.0M Share of the company4.160% T. Rowe Price Investment Management, Inc.'s full portfolio →

BlackRock, Inc.

1.4M

% of company

5.71%

Change vs last qtr

+367.5K (+36.3%)

Held since

Q3 '25

T. Rowe Price Investment Management, Inc.

1.0M

% of company

4.16%

Change vs last qtr

−261.2K (−20.6%)

Held since

Q1 '26

28 more super investors behind a free account

See every manager holding Ambiq Micro, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting AMBQ on Form N-PORT; together they hold 24.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$56.8M	643.4K	2.66%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$42.8M	485.1K	2.01%	0.05%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$56.8M

% of company

2.66%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$42.8M

% of company

2.01%

% of the fund

0.05%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Ambiq Micro, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
HW HSIEH Wen Hsuan Insider	638.9K	2.64%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company2.640% HSIEH Wen Hsuan's insider activity →
EF Esaka Fumihide Insider	443.9K	1.84%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.840% Esaka Fumihide's insider activity →

HSIEH Wen Hsuan

Insider

638.9K

% of company

2.64%

Change vs last qtr

—

Held since

—

Esaka Fumihide

Insider

443.9K

% of company

1.84%

Change vs last qtr

—

Held since

—

8 more holders behind a free account

See every insider and 5%+ holder of Ambiq Micro, Inc..

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