$ADTN

$6.55 +$0.12 (1.87%) Close

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

Ownership

13F as of Q2 2026 · 81.5M shares outstanding

Who owns ADTN?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 44.6%

BlackRock, Inc. 9.6% · Vanguard Portfolio Management LLC 6.3%

Institutional ownership

100.0%

+3.7 pts vs last qtr

Institutional holders

246

+19 vs last qtr

Net shares bought

+5.3M

by institutions in Q2 2026

New / sold out

52 / 33

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

UBS Group AG +2.7M
Two Sigma Investments, LP +1.8M

Biggest sellers in Q2 2026

Shannon River Fund Management LLC SOLD OUT −1.2M
SG Americas Securities, LLC −1.1M

Who is planning to sell?

Notices of proposed sale, last 12 months

$2.62M

3 notices from 3 people

Shares covered

172.1K

0.21% of the company

Arranged in advance

89%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Christoph Glingener Officer 10b5-1 $2.33M
Jacqueline H Rice Director $148K

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, FY2016–FY2025

+62.9%

+5.57% a year

Each share's claim on the business

−38.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$58.9M vs $113M

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+ years0% 3–5 years58% 1–3 years26% Under 1 year16%

Quarterly turnover

22.0%

of institutional shares changed hands

Top 10 managers, median time held

3.8 years

Super Investors

Investment managers reporting ADTN on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	7.8M	9.62%	−4.1K (−0.1%)	2022	0.0%
Shares held by quarter Peak holding8.3M (Q3'25) Change over 8 quarters+976.6K Share of the company9.620% BlackRock, Inc.'s full portfolio →
VP Vanguard Portfolio Management LLC	5.1M	6.30%	+364.2K (+7.6%)	2022	0.0%
Shares held by quarter Peak holding5.1M (Q2'26) Change over 8 quarters+5.1M Share of the company6.300% Vanguard Portfolio Management LLC's full portfolio →

BlackRock, Inc.

7.8M

% of company

9.62%

Change vs last qtr

−4.1K (−0.1%)

Held since

2022

Vanguard Portfolio Management LLC

5.1M

% of company

6.30%

Change vs last qtr

+364.2K (+7.6%)

Held since

2022

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting ADTN on Form N-PORT; together they hold 38.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$35.7M	2.6M	3.15%	0.00%	June 30, 2026
VI Vanguard Information Technology Index Fund Vanguard World Fund	$30M	1.8M	2.23%	0.02%	May 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$35.7M

% of company

3.15%

% of the fund

0.00%

As of

June 30, 2026

Vanguard Information Technology Index Fund

Vanguard World Fund

Position value

$30M

% of company

2.23%

% of the fund

0.02%

As of

May 31, 2026

23 more funds behind a free account

See every fund holding ADTRAN Holdings 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
ST Stanton Thomas R Insider	1.1M	1.38%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.380% Stanton Thomas R's insider activity →
WJ Wilson James Denson Jr Insider	149.6K	0.18%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.180% Wilson James Denson Jr's insider activity →

Stanton Thomas R

Insider

1.1M

% of company

1.38%

Change vs last qtr

—

Held since

—

Wilson James Denson Jr

Insider

149.6K

% of company

0.18%

Change vs last qtr

—

Held since

—

9 more holders behind a free account

See every insider and 5%+ holder of ADTRAN Holdings Inc.

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