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Adtran ADTN

US equityMarket cap rank #3590
$7.76 +$0.14 (+1.84%)
Pre-market · Oct 8, 9:10 am ET · After hours $7.77 +0.13%
Open$7.50
Prev close$7.62
Day range$7.47 – $7.91
Volume2.22M
Market cap$632.30M
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership107.4%-0.86 pts vs. prior quarter
Institutions holding296-6 vs. prior quarter
Insider trades (recent)27 buys / 22 sellsNet buying
Short interest15.39% of floatDays to cover 8.0 · as of 15 Sep 2026
Short-sale volume share17.9%5-day average of daily volume

Short-sale volume as % of daily volume

11%16%22%27%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$489.1K (12 inflow days, 8 outflow days).

Net flow by order size, last 20 sessions

−$979.2KSuper+$1.5MBig+$367.6KMid+$702.9KSmall

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 28.6% of shares outstanding.

Largest holders

  • BlackRock9.65%
  • Vanguard Portfolio Management, LLC6.32%
  • Vanguard Capital Management, LLC4.99%
  • UBS Asset Management3.87%
  • State Street Global Advisors3.80%
  • Royce & Associates, LP3.66%
  • Two Sigma Investments, LP3.57%
  • Millennium Management LLC3.35%

By investor type

  • Mutual Fund73.04%
  • Hedge Fund19.78%
  • Public Company6.89%
  • VC/PE Fund2.90%
  • Private Company2.62%
  • Individual/Insider2.25%
  • Government Pension Fund0.94%
  • Sovereign Wealth Fund0.75%

Reported short interest has fallen from 15.53% to 15.39% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

HolderTypePeriodShare changeNew stake
UBS Asset Management Mutual Fund 2026/Q3 +2,703,291 3.9%
J.P. Morgan Asset Management, Inc. Mutual Fund 2026/Q3 +2,018,803 2.7%
Two Sigma Investments, LP Hedge Fund 2026/Q3 +1,772,829 3.6%
Renaissance Technologies Corp. Hedge Fund 2026/Q3 +1,570,841 2.2%
Qube Research & Technologies Ltd Mutual Fund 2026/Q3 +1,128,968 1.7%
Millennium Management LLC Hedge Fund 2026/Q3 +826,409 3.4%
State Street Global Advisors Mutual Fund 2026/Q3 +732,057 3.8%
Norges Bank Investment Management Sovereign Wealth Fund 2026/Q3 +575,400 0.7%
Hennessy Advisors, Inc. Mutual Fund 2026/Q3 +526,300 0.6%
Counterpoint Mutual Funds, LLC Mutual Fund 2026/Q3 +497,145 0.7%
Boston Partners Global Investors, Inc. Mutual Fund 2026/Q3 +469,724 2.0%
Assenagon Asset Management S.A. Mutual Fund 2026/Q3 +459,802 1.1%
FMR Mutual Fund 2026/Q3 +395,995 1.2%
Bank of America Corporation Public Company 2026/Q3 +365,596 0.9%
Vanguard Portfolio Management, LLC Mutual Fund 2026/Q3 +364,197 6.3%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

DateInsiderTitleTransactionSharesPriceHeld after
9 Aug 2026 Christoph Glingener Chief Technology Officer Other Acquisition +27,924 – 65,622
5 Aug 2026 Timothy Santo Senior VP of Finance, Principal Accounting Officer, Treasurer & CFO Open Market Acquisition +6,579 $7.60 16,339
23 Jul 2026 Christoph Glingener Chief Technology Officer Other Acquisition +9,384 – 37,698
30 Jun 2026 Anne DelSanto Independent Director Other Acquisition +4,399 – 4,399
30 Jun 2026 Anne DelSanto Independent Director Initial Statement of Beneficial +0 – –
19 May 2026 James Wilson Chief Revenue Officer Other Disposition -10,469 – 137,055
19 May 2026 James Wilson Chief Revenue Officer Open Market Disposition -9,332 $14.72 137,055
7 May 2026 Christoph Glingener Chief Technology Officer Derivative Exercise and Sale -148,392 $15.06 26,408
6 May 2026 Christoph Glingener Chief Technology Officer Intent to Sell (Form 144) -148,392 $15.71 –
31 Mar 2026 Thomas Stanton Chairperson & CEO Other Acquisition +170,723 – 1,126,554
31 Mar 2026 James Wilson Chief Revenue Officer Other Acquisition +24,908 – 156,856
31 Mar 2026 Timothy Santo Senior VP of Finance, Principal Accounting Officer, Treasurer & CFO Other Acquisition +28,252 – 43,585
18 Mar 2026 Timothy Santo Senior VP of Finance, Principal Accounting Officer, Treasurer & CFO Sale to Issuer -1,501 $11.90 9,760
3 Mar 2026 Jacqueline Rice Independent Director Open Market Disposition -14,406 $10.29 76,090
25 Jan 2026 Thomas Stanton Chairperson & CEO Sale to Issuer -12,407 $9.24 955,831
25 Jan 2026 Thomas Stanton Chairperson & CEO Other Acquisition +27,973 – 955,831
25 Jan 2026 James Wilson Chief Revenue Officer Sale to Issuer -1,309 $9.24 131,948
25 Jan 2026 James Wilson Chief Revenue Officer Other Acquisition +3,777 – 131,948
25 Jan 2026 Thomas Stanton Chairperson & CEO Sale to Issuer -31,944 $9.73 940,265
25 Jan 2026 James Wilson Chief Revenue Officer Sale to Issuer -2,225 $9.73 129,480

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 12,536,823 15.4% 8.0
31 Aug 2026 12,917,550 15.9% 7.7
14 Aug 2026 11,785,700 14.5% 4.6
31 Jul 2026 10,646,986 13.1% 4.2
15 Jul 2026 12,697,742 15.7% 9.2
30 Jun 2026 12,579,189 15.5% 5.4

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