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End-of-day prices provided by Twelve Data · One close per session; the series does not update during the trading day.
Latest on record
The most recent facts, as filed.
Up to three of the most recent, checkable facts already loaded on this page, each linked to its source.
- Aug 10, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
- Aug 6, 2026Reported purchase · Form 4Timothy P Santo, SVP of Finance; CFO · $50.0KOpen the filing ↗
- Aug 4, 2026Quarterly report · 10-QFiled by the company itself.Open the filing ↗
In numbers
What this profile holds, counted.
Closes · 1 year250
SEC filings on record1,95814 flagged findings
Reported transactions (Form 4)80since Mar 21, 2023 · and 5 other holdings
Corporate events (8-K)30since Jun 1, 2023
What the record says
Description, identity and filings, each with its source.
Every block cites its source. The colour of a finding marks its category — which document, who filed it — not how much it matters.
What the company does
Adtran, Inc. is an American fiber networking and telecommunications company headquartered in Huntsville, Alabama. It is a vendor of both residential and enterprise networking equipment, along with administrative software for network management and deployment. Its customers include communications service providers, governments, enterprises and utilities.
Source: Wikipedia (CC BY-SA 4.0) · copied on Sep 3, 2026 · may not reflect recent changes.
Regulatory history
Topics detected in its SEC reports, with the original excerpt.
Each topic is assigned by a classifier over the full filing; the excerpts show where it was detected and are not always enough to verify it. Open the filing to read it in full.
- 2026-05-05share offering or dilution eventrecentOpen filing ↗“…take a minimum of 12 months for a ruling and, thereafter, an expected appeal process will take a further 12-24 months to resolve;…”
+1 more passage from the same document
- “…rate of the 2030 Notes over their expected life is 4.7 %. The following is a summary of interest expense for the 2030 Notes: Three…”
- 2026-05-05capital return (buybacks/dividends)recentOpen filing ↗“…period. No sinking fund is provided for the 2030 Notes, which means the Company is not required to redeem or retire the 2030…”
+1 more passage from the same document
- “…provided for the 2030 Notes, which means the Company is not required to redeem or retire the 2030 Notes periodically. If certain…”
Original excerpts from SEC filings, untranslated. Not advice and not a prediction.
The 25 most recent filings (of 1,958)
Every SEC filing, newest first, with what it is. Below, each type with its own explanation.
- Aug 10, 268-K ↗Current report · A senior executive left or was appointed
- Aug 4, 2610-Q ↗Quarterly report
- Aug 4, 268-K ↗Current report · Results · Communication to the market
- Jul 28, 26Form 4 ↗Insider transaction
- Jul 23, 268-K ↗Current report · A material agreement was terminated
- Jul 22, 268-K ↗Current report · Results · Communication to the market
- Jul 17, 26S-3ASR ↗Securities offering
- Jul 6, 26Form 4 ↗Insider transaction
- Jul 1, 26Form 3 ↗Insider transaction
- Jun 26, 268-K ↗Current report · A senior executive left or was appointed
- May 22, 26Form 4 ↗Insider transaction
- May 20, 26Form 144 ↗Notice of proposed sale
- May 18, 268-K ↗Current report · Bylaws or fiscal year change · Shareholder vote results
- May 11, 26Form 4 ↗Insider transaction
- May 7, 26Form 144 ↗Notice of proposed sale
- May 5, 2610-Q ↗Quarterly report
- May 5, 268-K ↗Current report · Results · Communication to the market
- May 1, 26DEFA14A ↗Shareholder meeting and votes
- Apr 28, 26SCHEDULE 13G ↗Passive stake · Vanguard Portfolio Management · 6.0% · event on Mar 31, 26
- Apr 7, 268-K ↗Current report · A senior executive left or was appointed
1,958 filings on record, the oldest from Feb 7, 96.
Listing the 25 most recent filings of the 1,958 on record.
62947
- Aug 10, 26A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Jul 23, 26A material agreement was terminated+3 more in the same filing8-K 1.02 ↗
3 senior executive changes2025 – 2026show all 3hide
- Jun 26, 26A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Apr 7, 26A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Dec 11, 25A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Sep 22, 25Sold unregistered shares+3 more in the same filing8-K 3.02 ↗
- Sep 17, 25Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- May 13, 25Past accounts declared unreliable and being restated+2 more in the same filing8-K 4.02 ↗
- May 12, 25Entered a material agreement+1 more in the same filing8-K 1.01 ↗
3 senior executive changes2024 – 2025show all 3hide
- Mar 7, 25A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Aug 30, 24A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Aug 2, 24A senior executive left or was appointed8-K 5.02 ↗
- Jun 10, 24Took on a new financial obligation+2 more in the same filing8-K 2.03 ↗
- May 9, 24A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Apr 17, 24Restructuring plan with committed costs+1 more in the same filing8-K 2.05 ↗
- Feb 20, 24Past accounts declared unreliable and being restated8-K 4.02 ↗
8 older filings not shown · The record reaches back to May 20, 05.
Stress disclosures older than the timeline above. They are individual events from the record, not a complete timeline: there may be more between them.
- Aug 10, 23Past accounts declared unreliable and being restated+1 more in the same filing8-K 4.02 ↗
- Jul 8, 22Listing notice (8-K 3.01)+7 more in the same filing8-K 3.01 ↗
- Aug 21, 19Listing notice (8-K 3.01)+1 more in the same filing8-K 3.01 ↗
The full record holds 6 stress filings.
Corporate events are tracked from 2004-08-23, when the SEC renumbered 8-K items. Earlier filings use an incompatible numbering and are not classified here.
Schedule 13G: short-form filing
The short form, for holders who meet specific requirements: institutional investors, passive investors without a control purpose, or exempt investors. Asset managers and index funds usually file it.
- The Vanguard Group10.2%Jun 30, 25SCHEDULE 13G/A ↗
- EGORA Ventures AG (f/k/a EGORA Holding GmbH)6.7%Feb 14, 25SCHEDULE 13G ↗
- Vanguard Portfolio Management6.0%Mar 31, 26SCHEDULE 13G ↗
- EGORA Ventures AG5.0%Feb 2, 26SCHEDULE 13G/A ↗
- DnB Asset Management AS4.4%Mar 31, 25SCHEDULE 13G/A ↗
show 2 more holdershide
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC4.2%Mar 31, 25SCHEDULE 13G/A ↗
- Divisar Capital Management LLC4.0%Sep 30, 25SCHEDULE 13G/A ↗2 co-filers on this document — the figure is the largest single stake, not their sum. · 4 earlier filings
Structured 13D/G data starts 2023-12, when the SEC moved these filings to a machine-readable format. Earlier filings exist but are not parsed here.
- Aug 6, 26Buy$50KTimothy P SantoSVP of Finance; CFO↗
- May 20, 26Sell$137KJames Denson Wilson JrChief Revenue Officer↗
- May 8, 26Sell$334KChristoph GlingenerChief Technology Officer↗
- May 7, 26Sell$607KChristoph GlingenerChief Technology Officer↗
- May 7, 26Sell$1.3MChristoph GlingenerChief Technology Officer↗
- Mar 4, 26Sell$148KHourigan Rice Jacqueline↗
- Nov 28, 25Buy$49KTimothy P SantoSVP of Finance; CFO↗
- Nov 26, 25Buy$100KNikos Theodosopoulos↗
- Nov 24, 25Buy$300KTHOMAS R STANTONChairman & CEO↗
Stock compensation, tax and giftsshow the 31 other transactionshide
Stock compensation, tax withholding, option exercises and gifts. They are listed separately and are not included in the purchase and sale totals. The type describes the transaction, not the filer's intent.
- Aug 10, 26Compensationamount n/aChristoph GlingenerChief Technology Officer↗
- Jul 24, 26Compensationamount n/aChristoph GlingenerChief Technology Officer↗
- Jul 1, 26Compensationamount n/aAnne DelSanto↗
- May 20, 26Giftamount n/aJames Denson Wilson JrChief Revenue Officer↗
- May 8, 26Compensation$271KChristoph GlingenerChief Technology Officer↗
- May 7, 26Compensation$289KChristoph GlingenerChief Technology Officer↗
- May 7, 26Compensation$1.0MChristoph GlingenerChief Technology Officer↗
- Apr 1, 26Compensationamount n/aTHOMAS R STANTONChairman & CEO↗
- Apr 1, 26Compensationamount n/aTimothy P SantoSVP of Finance; CFO↗
- Apr 1, 26Compensationamount n/aJames Denson Wilson JrChief Revenue Officer↗
- Mar 19, 26Tax$18KTimothy P SantoSVP of Finance; CFO↗
- Jan 26, 26Tax$140KTHOMAS R STANTONChairman & CEO↗
- Jan 26, 26Tax$10KJames Denson Wilson JrChief Revenue Officer↗
- Jan 26, 26Compensationamount n/aTHOMAS R STANTONChairman & CEO↗
- Jan 26, 26Tax$115KTHOMAS R STANTONChairman & CEO↗
- Jan 26, 26Tax$12KJames Denson Wilson JrChief Revenue Officer↗
- Jan 26, 26Compensationamount n/aJames Denson Wilson JrChief Revenue Officer↗
- Jan 24, 26Tax$167KTHOMAS R STANTONChairman & CEO↗
- Jan 24, 26Tax$12KJames Denson Wilson JrChief Revenue Officer↗
- Jan 20, 26Tax$95KTHOMAS R STANTONChairman & CEO↗
- Jan 20, 26Tax$7KJames Denson Wilson JrChief Revenue Officer↗
- Dec 31, 25Compensationamount n/aHourigan Rice Jacqueline↗
- Dec 31, 25Compensationamount n/aH FENWICK HUSS↗
- Dec 31, 25Compensationamount n/aBalan Nair↗
- Dec 31, 25Compensationamount n/aGregory James McCray↗
- Dec 31, 25Compensationamount n/aNikos Theodosopoulos↗
- Dec 31, 25Compensationamount n/aKathryn A Walker↗
- Nov 17, 25Tax$25KTHOMAS R STANTONChairman & CEO↗
- Nov 17, 25Tax$3KJames Denson Wilson JrChief Revenue Officer↗
- Jul 13, 25Tax$52KTHOMAS R STANTONChairman & CEO↗
- Apr 13, 25Tax$41KTHOMAS R STANTONChairman & CEO↗
The full record holds 152 transactions and goes back to Dec 31, 22.
Its sector and its market
Adtran Holdings, Inc. among Information Technology companies
The profile shows what is on record. Context and Radar place the company among those of its sector and region.
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Coverage
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- End-of-day closes provided by Twelve Data. One close per session; not real time. Closes adjusted for splits.
- Series quality
- 250 clean closes in the period.
- SEC records
- 1,958 documents on file, from Feb 7, 1996 to Aug 10, 2026.
- Company description
- Wikipedia, read on Sep 3, 2026.
- This page
- Generated on Oct 19, 2026; refreshed through the day.
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Which SEC documents appear here?
Those filed with the SEC by the company, its insiders and its major shareholders, within our coverage: periodic reports (10-K, 10-Q, 20-F), material events (8-K), proposed sale notices (Form 144), insider transactions (Form 4) and stakes above 5% (13D/13G). Each links to the original on EDGAR.
Why does a European company show no SEC records?
It depends on the company: some European issuers file a 20-F or 6-K with the SEC and others don't. The profile shows whatever is on record; when there is nothing, it says so rather than guessing why. Europe does not yet have a common filing archive like EDGAR in the United States. The EU will open its own, ESAP, in July 2027 (managers' transactions arrive in January 2028), and we plan to add it once it is available.
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