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Business Summary
Filings
Ownership
Valuation
Ownership — ADTN
Institutional Holdings
Insider Transactions
US Institutional Ownership
91.3%
Institution
Shares
Value
Ownership %
Change
Filing Date
BlackRock, Inc.
7.84M
$98.0M
9.73%
-285.0K
2026-03-31
VANGUARD PORTFOLIO MANAGEMENT LLC
4.77M
$60.0M
5.92%
--
2026-03-31
VANGUARD CAPITAL MANAGEMENT LLC
3.43M
$43.0M
4.25%
--
2026-03-31
ROYCE & ASSOCIATES LP
3.13M
$39.0M
3.88%
+530.4K
2026-03-31
DNB Asset Management AS
3.12M
$39.0M
3.88%
--
2026-03-31
STATE STREET CORP
2.35M
$29.0M
2.92%
+364.8K
2026-03-31
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
1.99M
$25.0M
2.47%
-489.1K
2026-03-31
MILLENNIUM MANAGEMENT LLC
1.90M
$23.0M
2.35%
-798.4K
2026-03-31
MORGAN STANLEY
1.83M
$23.0M
2.28%
+489.3K
2026-03-31
GEODE CAPITAL MANAGEMENT, LLC
1.82M
$22.0M
2.26%
+53.0K
2026-03-31
Divisar Capital Management LLC
1.77M
$22.0M
2.20%
-1.22M
2026-03-31
First Eagle Investment Management, LLC
1.37M
$17.0M
1.70%
+133.5K
2026-03-31
DIMENSIONAL FUND ADVISORS LP
1.34M
$16.0M
1.66%
+448.8K
2026-03-31
SG Americas Securities, LLC
1.32M
$16.0M
1.63%
+459.0K
2026-03-31
NEEDHAM INVESTMENT MANAGEMENT LLC
1.23M
$15.0M
1.53%
-219.0K
2026-03-31
Shannon River Fund Management LLC
1.22M
$15.0M
1.51%
--
2026-03-31
D. E. Shaw & Co., Inc.
1.22M
$15.0M
1.51%
+20.2K
2026-03-31
Boston Partners
1.18M
$14.0M
1.47%
--
2026-03-31
SEI INVESTMENTS CO
1.11M
$13.0M
1.37%
+683.3K
2026-03-31
Tieton Capital Management, LLC
1.04M
$13.0M
1.29%
--
2026-03-31
Invesco Ltd.
991.0K
$12.0M
1.23%
+744.2K
2026-03-31
GOLDMAN SACHS GROUP INC
970.7K
$12.0M
1.21%
+449.5K
2026-03-31
FEDERATED HERMES, INC.
922.6K
$11.0M
1.15%
+56.2K
2026-03-31
MARSHALL WACE, LLP
891.5K
$11.0M
1.11%
+533.5K
2026-03-31
Squarepoint Ops LLC
888.0K
$11.0M
1.10%
+90.5K
2026-03-31
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