ADTRAN Holdings, Inc. (ADTN) Ownership
ADTN ownership summary
as of October 17, 2026- Institutions
- 109.4% of shares outstanding
- Insiders
- 2.25% of shares outstanding
- Shares outstanding
- 81.5M
- Float
- 79.4M shares available to trade
- Short interest
- 16.56% 11.9M shares short
- Days to cover
- 7.29 short interest down 5.4% vs prior month
- Institutions 109.39%
- Insiders 2.25%
ADTN top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 9.62% | 7.8M | $49.4M | −4,058 (−0.1%) | June 30, 2026 |
| 2 | Vanguard Portfolio Management, LLC | 6.30% | 5.1M | $32.4M | +364,197 (+7.6%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 4.31% | 3.5M | $22.1M | +84,041 (+2.5%) | June 30, 2026 |
| 4 | State Street Corp | 3.78% | 3.1M | $19.5M | +732,057 (+31.1%) | June 30, 2026 |
| 5 | Royce & Associates, LP | 3.65% | 3.0M | $18.8M | −154,486 (−4.9%) | June 30, 2026 |
| 6 | UBS Group AG | 3.61% | 2.9M | $18.6M | +2.7M (+1,080.3%) | June 30, 2026 |
| 7 | Two Sigma Investments LLC | 3.55% | 2.9M | $18.3M | +1.8M (+157.8%) | June 30, 2026 |
| 8 | Millennium Management LLC | 3.34% | 2.7M | $17.2M | +826,409 (+43.6%) | June 30, 2026 |
| 9 | JPMorgan Chase & Co | 3.22% | 2.6M | $16.6M | +1.1M (+72.7%) | June 30, 2026 |
| 10 | DnB NOR Asset Management (Asia) | 3.21% | 2.6M | $16.5M | −504,290 (−16.1%) | June 30, 2026 |
| 11 | Arnhold & S. Bleichroeder Advisers, LLC | 3.06% | 2.5M | $15.8M | +1.1M (+82.4%) | June 30, 2026 |
| 12 | Geode Capital Management, LLC | 2.40% | 2.0M | $12.4M | +138,929 (+7.6%) | June 30, 2026 |
| 13 | Assenagon Asset Management SA | 2.25% | 1.8M | $11.6M | +1.4M (+300.8%) | June 30, 2026 |
| 14 | Morgan Stanley - Brokerage Accounts | 2.20% | 1.8M | $11.3M | −40,120 (−2.2%) | June 30, 2026 |
| 15 | Renaissance Technologies Corp | 2.18% | 1.8M | $11.2M | +1.6M (+774.2%) | June 30, 2026 |
| 16 | Boston Partners Global Investors, Inc | 2.03% | 1.7M | $10.4M | +469,724 (+39.8%) | June 30, 2026 |
| 17 | Qube Research & Technologies | 1.72% | 1.4M | $8.8M | +1.1M (+418.2%) | June 30, 2026 |
| 18 | Dimensional Fund Advisors, Inc. | 1.68% | 1.4M | $8.6M | +29,215 (+2.2%) | June 30, 2026 |
| 19 | William Blair Investment Management, LLC | 1.35% | 1.1M | $6.9M | −890,511 (−44.8%) | June 30, 2026 |
| 20 | D. E. Shaw & Co LP | 1.34% | 1.1M | $6.9M | −127,071 (−10.4%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 13.4M shares and 6 cut 1.7M.
ADTN top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.15% | 2.6M | $16.2M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.48% | 2.0M | $12.7M | −23,296 (−1.1%) | September 30, 2026 |
| 3 | Vanguard Information Technology ETF | 2.23% | 1.8M | $11.5M | −3,792 (−0.2%) | August 31, 2026 |
| 4 | DNB Teknologi A | 2.13% | 1.7M | $10.9M | — | August 31, 2026 |
| 5 | Fidelity Enhanced Small Cap Core ETF | 1.79% | 1.5M | $9.2M | +3,051 (+0.2%) | September 30, 2026 |
| 6 | Heartland Value Investor | 1.35% | 1.1M | $6.9M | +350,000 (+46.7%) | August 31, 2026 |
| 7 | State Street® SPDR® S&P® Telecom ETF | 1.32% | 1.1M | $6.8M | +10,222 (+1.0%) | September 30, 2026 |
| 8 | First Eagle Small Cap Opportunity I | 1.29% | 1.1M | $6.7M | — | August 31, 2026 |
| 9 | Vanguard Strategic Equity Inv | 1.13% | 919K | $5.8M | +279,621 (+43.8%) | June 30, 2026 |
| 10 | Fidelity Small Cap Index | 1.03% | 841K | $5.3M | +7,293 (+0.9%) | July 31, 2026 |
| 11 | FTGF RY US SmCp Opp A USD Dis(A) | 0.92% | 753K | $4.8M | +48,768 (+6.9%) | August 31, 2026 |
| 12 | iShares Russell 2000 Growth ETF | 0.89% | 729K | $4.6M | −922 (−0.1%) | September 30, 2026 |
| 13 | Royce Micro-Cap Trust | 0.86% | 705K | $4.4M | −15,547 (−2.2%) | June 30, 2026 |
| 14 | Paradigm Micro-Cap | 0.86% | 700K | $4.4M | +129,362 (+22.7%) | September 30, 2026 |
| 15 | Royce Small-Cap Opportunity Invmt | 0.82% | 667K | $4.2M | −101,546 (−13.2%) | June 30, 2026 |
| 16 | Vanguard Strategic Small-Cap Equity Inv | 0.78% | 638K | $4.0M | −91,289 (−12.5%) | June 30, 2026 |
| 17 | Vanguard Explorer Inv | 0.70% | 570K | $3.6M | — | June 30, 2026 |
| 18 | Federated Hermes MDT Small Cap Core IS | 0.69% | 563K | $3.6M | −30,915 (−5.2%) | June 30, 2026 |
| 19 | iShares U.S. Digital Infras & RE ETF | 0.64% | 524K | $3.3M | — | September 30, 2026 |
| 20 | Skandia Time Global | 0.62% | 503K | $3.2M | +57,975 (+13.0%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ADTN insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-11-28 | Timothy P Santo | Buy | $8.02 | 6,150 | $49,323 |
| 2025-11-26 | Nikos Theodosopoulos | Buy | $7.81 | 12,859 | $100,429 |
| 2025-11-24 | Thomas R Stanton | Buy | $7.33 | 40,928 | $300,002 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ADTN shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ADTN
Institutional investors own 109.4% of ADTRAN's shares and insiders 2.25%. The largest holder is BlackRock Inc with 9.62% of the shares (7.8M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 6 reduced their stake in the latest filings. Short interest is 16.56% of the float, or 7.29 days of average trading volume. The share count rose 47.7% since 2014.
Related: ADTN analyst forecast, ADTN key metrics. See the ADTN stock overview for the latest quote and news.
ADTN ownership FAQ
Who owns the most ADTRAN stock?
The largest shareholders of ADTRAN are BlackRock Inc (9.62%), Vanguard Portfolio Management, LLC (6.30%), Vanguard Capital Management, LLC (4.31%), State Street Corp (3.78%), Royce & Associates, LP (3.65%).
What percentage of ADTRAN is owned by institutions?
Institutions hold 109.4% of ADTRAN's shares outstanding; insiders hold 2.25%.
Which funds own ADTRAN?
The largest fund holders of ADTRAN are Vanguard MStar Total Stk Mkt Idx Invest (3.15%), iShares Russell 2000 ETF (2.48%), Vanguard Information Technology ETF (2.23%), DNB Teknologi A (2.13%), Fidelity Enhanced Small Cap Core ETF (1.79%).
What is ADTRAN's short interest?
11.9M shares of ADTRAN were sold short, 16.56% of the float; at the average daily volume it would take 7.29 days to cover.
Are insiders buying or selling ADTRAN?
Of the latest 3 reported insider transactions in ADTRAN (since November 24, 2025), 3 were purchases and 0 were sales.
How many shares of ADTRAN are outstanding?
ADTRAN has 81.5M shares outstanding, of which 79.4M are in the public float.