$ATEN

$25.79 +$0.34 (1.34%) Close

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

Ownership

13F as of Q2 2026 · 72.6M shares outstanding

Who owns ATEN?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 73.5%

Chung Peter Y 25.5% · BlackRock, Inc. 18.7%

Institutional ownership

100.0%

+0.4 pts vs last qtr

Institutional holders

308

+44 vs last qtr

Net shares bought

+4.1M

by institutions in Q2 2026

New / sold out

76 / 32

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

First Trust Advisors LP +1.5M
FMR LLC +1.4M

Biggest sellers in Q2 2026

Barclays PLC −912.1K
Deprince Race & Zollo Inc SOLD OUT −564.8K

Who is planning to sell?

Notices of proposed sale, last 12 months

$3.6M

8 notices from 5 people

Shares covered

153.4K

0.21% of the company

Arranged in advance

70%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Dhrupad Trivedi Officer 10b5-1 $2.06M
Eric Singer Director $672K

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, FY2014–FY2025

+51.2%

+4.70% a year

Each share's claim on the business

−33.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$245M vs $154M

over 10 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+ years63% 3–5 years8% 1–3 years17% Under 1 year12%

Quarterly turnover

14.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ATEN on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	13.6M	18.69%	+480.2K (+3.7%)	≤2021	0.0%
Shares held by quarter Peak holding13.6M (Q4'24) Change over 8 quarters+454.5K Share of the company18.690% BlackRock, Inc.'s full portfolio →
PC Penserra Capital Management LLC	3.1M	4.23%	−526.1K (−14.6%)	2024	0.9%
Shares held by quarter Peak holding4.3M (Q4'25) Change over 8 quarters+3.1M Share of the company4.230% Penserra Capital Management LLC's full portfolio →

BlackRock, Inc.

13.6M

% of company

18.69%

Change vs last qtr

+480.2K (+3.7%)

Held since

≤2021

Penserra Capital Management LLC

3.1M

% of company

4.23%

Change vs last qtr

−526.1K (−14.6%)

Held since

2024

28 more super investors behind a free account

See every manager holding A10 Networks, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ATEN on Form N-PORT; together they hold 55.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$162M	4.3M	5.97%	0.15%	June 30, 2026
AC Amplify Cybersecurity ETF Amplify ETF Trust	$99.2M	2.7M	3.66%	3.83%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$162M

% of company

5.97%

% of the fund

0.15%

As of

June 30, 2026

Amplify Cybersecurity ETF

Amplify ETF Trust

Position value

$99.2M

% of company

3.66%

% of the fund

3.83%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding A10 Networks, 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
CP Chung Peter Y Insider	18.5M	25.50%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company25.500% Chung Peter Y's insider activity →
TD Trivedi Dhrupad Insider	887.8K	1.22%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.220% Trivedi Dhrupad's insider activity →

Chung Peter Y

Insider

18.5M

% of company

25.50%

Change vs last qtr

—

Held since

—

Trivedi Dhrupad

Insider

887.8K

% of company

1.22%

Change vs last qtr

—

Held since

—

9 more holders behind a free account

See every insider and 5%+ holder of A10 Networks, Inc..

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