ADTRAN Holdings, Inc.
ADTRAN Holdings, Inc. (ADTN) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ADTN · as of Sep 30, 2025
Ownership Breakdown
230
Institutional Holders
▲ 28 vs Q2
$658.71M
Total Inst. Value
▲ $126.82M vs Q2
81.00M
Shares Outstanding
freeFloat 91.77%
67.50M
13F Shares Held
▲ 8.21M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ADTN largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC telephone & telegraph apparatus | 8.38M | 10.51% | 10.51% | $78.64B | Nov 7, 2025 | ▲ 217.1K |
BLACKROCK, INC. telephone & telegraph apparatus | 8.27M | 10.37% | 10.37% | $77.60B | Nov 12, 2025 | ▲ 215.0K |
DIVISAR CAPITAL MANAGEMENT LLC telephone & telegraph apparatus | 3.21M | 4.03% | 4.03% | $30.14B | Nov 14, 2025 | ▼ 1.02M |
DNB ASSET MANAGEMENT AS telephone & telegraph apparatus | 2.90M | 3.64% | 3.64% | $27.24B | Nov 12, 2025 | ▲ 174.4K |
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC telephone & telegraph apparatus | 2.74M | 3.43% | 3.43% | $25.67B | Nov 12, 2025 | ▼ 166.1K |
ROYCE & ASSOCIATES LP telephone & telegraph apparatus | 2.41M | 3.02% | 3.02% | $22.61B | Nov 12, 2025 | ▲ 308.7K |
STATE STREET CORP telephone & telegraph apparatus | 1.90M | 2.38% | 2.38% | $17.82B | Nov 14, 2025 | ▲ 44.0K |
GEODE CAPITAL MANAGEMENT, LLC telephone & telegraph apparatus | 1.77M | 2.22% | 2.22% | $16.61B | Nov 12, 2025 | ▲ 20.9K |
CITADEL ADVISORS LLC telephone & telegraph apparatus | 1.22M | 1.53% | 1.53% | $11.43B | Nov 14, 2025 | ▲ 813.8K |
FIRST EAGLE INVESTMENT MANAGEMENT, LLC telephone & telegraph apparatus | 1.21M | 1.52% | 1.52% | $11.34B | Nov 12, 2025 | ▲ 75.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
34
Increased
+9.54M shares2
New Positions
first time holders13
Decreased
−2.94M shares0
Sold Out
fully exitedNet shares change (top 50)
+6.60M
+9.54M / −2.94M
Net new holders
+23
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ADTN insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
6
Buy transactions
10
Sell transactions
0.60
Buy/Sell ratio
$1M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Wilson James Denson Jr Chief Revenue Officer | May 20, 2026 | Sale | 9,332 | $14.72 | $137.4K | 143.3K | Form 4 ↗ |
Wilson James Denson Jr Chief Revenue Officer | May 20, 2026 | Gift | 10,469 | — | — | 132.8K | Form 4 ↗ |
Glingener Christoph Chief Technology Officer | May 7, 2026 | Sale | 41,220 | $14.73 | $607.2K | 46.6K | Form 4 ↗ |
Glingener Christoph Chief Technology Officer | May 7, 2026 | Sale | 84,895 | $15.06 | $1.28M | 46.6K | Form 4 ↗ |
Glingener Christoph Chief Technology Officer | May 8, 2026 | Sale | 22,277 | $15.00 | $334.2K | 46.6K | Form 4 ↗ |
Wilson James Denson Jr Chief Revenue Officer | Apr 1, 2026 | Award | 24,908 | — | — | 152.6K | Form 4 ↗ |
Santo Timothy P SVP of Finance; CFO | Apr 1, 2026 | Award | 28,252 | — | — | 53.3K | Form 4 ↗ |
STANTON THOMAS R Chairman & CEO | Apr 1, 2026 | Award | 170,723 | — | — | 1.13M | Form 4 ↗ |
Santo Timothy P SVP of Finance; CFO | Mar 19, 2026 | Tax Withhold | 1,501 | $11.90 | $17.9K | 25.1K | Form 4 ↗ |
Jacqueline Hourigan Rice director | Mar 4, 2026 | Sale | 14,406 | $10.29 | $148.2K | 13.8K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
ADTRAN Holdings, Inc. (ADTN) is primarily owned by institutional investors, who hold approximately 83.3% of total shares outstanding. Company insiders own approximately 8.23%, while retail and public investors account for the remaining 8.43%.
The largest institutional shareholder of ADTRAN Holdings, Inc. is VANGUARD GROUP INC, holding approximately 8.38 million shares — equal to 10.51% of outstanding shares — as of September 30, 2025.
A total of 230 institutional investors currently hold ADTN stock, with a combined institutional value of approximately $658,713,568 as of the most recent 13F filing period.
Frequently asked questions
ADTN ownershipADTRAN Holdings, Inc. (ADTN) is primarily owned by institutional investors, who hold approximately 83.3% of shares. The largest shareholder is VANGUARD GROUP INC with a 10.51% stake. Company insiders hold 8.23%. Data sourced from SEC Form 13F as of September 30, 2025.