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ADTN · ADTRAN Holdings, Inc.

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$7.10 -0.05 (-0.70%) At close · Sep 4
Market Cap
$592.37M
Shares
81.48M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 249
Total Value: $1,178,900,613
Total Shares: 84,813,005
Showing 1–100 of 254 holdings by value · page 1 of 3

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 249 13F filers · Δ vs Mar 31, 2026
Top Holder
9.2%
Sep 2023 → Jun 2026 · range 9.2% – 20.4%
−0.7 pts
Top 5
26.6%
Sep 2023 → Jun 2026 · range 26.6% – 49.3%
−1.7 pts
Top 10
42.8%
Sep 2023 → Jun 2026 · range 40.8% – 64.9%
+2.0 pts
HHI
272
Sep 2023 → Jun 2026 · range 272 – 756
Broadly held−4

Quarterly Activity

vs Mar 31, 2026
New
52
Increased
94
Decreased
74
Sold Out
32
Unchanged
29
Holder count: +20
Institutional value: +18.9%
Shares held: +7.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 254
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 926282 CUSIP 00486H105 13F (30d) 208 filings 205 filers Visit website Investor relations