SIC 3661 · Manufacturing

Telephone & Telegraph Apparatus

OpenFilings tracks 3 companies that the SEC classifies under Standard Industrial Classification code 3661; the most recent filing among them is dated Oct 20, 2026. 3 of them report standardized annual figures in XBRL, shown in the revenue column.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. Not investment advice.

Companies in this industry

Telephone & Telegraph Apparatus companies (SIC 3661)
#CompanyStateLatest filingRevenue (latest FY)
338CIEN CIENA CORPMDOct 19, 2026$4.8BFY2025
842FN FabrinetCAOct 20, 2026$4.6BFY2026
2873ADTN ADTRAN Holdings, Inc.ALAug 10, 2026$1.1BFY2025

Ranked by position in the SEC company ticker list (roughly by market value) among all companies we track. Revenue is the latest full fiscal year; amounts in a foreign currency are shown with its code.

Latest reports from these companies

Annual, quarterly and current reports and proxy statements filed by the companies above, newest first.

Recent filings, SIC 3661
FiledCompanyFormWhat it isOriginal
Oct 20, 2026FN FabrinetDEF 14ADefinitive proxy statement· period Dec 10, 2026Document · Index
Sep 3, 2026CIEN CIENA CORP10-QQuarterly report· period Aug 1, 2026Document · Index
Sep 3, 2026CIEN CIENA CORP8-KResults of operations· period Sep 3, 2026Document · Index
Aug 18, 2026FN Fabrinet10-KAnnual report· period Jun 26, 2026Document · Index
Aug 17, 2026FN Fabrinet8-KMaterial agreement; Results of operations; New financial obligation; Director or officer change· period Aug 11, 2026Document · Index
Aug 10, 2026ADTN ADTRAN Holdings, Inc.8-KDirector or officer change· period Aug 10, 2026Document · Index
Aug 4, 2026ADTN ADTRAN Holdings, Inc.10-QQuarterly report· period Jun 30, 2026Document · Index
Aug 4, 2026ADTN ADTRAN Holdings, Inc.8-KResults of operations; Regulation FD disclosure· period Aug 3, 2026Document · Index
Jul 23, 2026ADTN ADTRAN Holdings, Inc.8-KMaterial agreement; Agreement terminated; New financial obligation· period Jul 21, 2026Document · Index
Jul 22, 2026ADTN ADTRAN Holdings, Inc.8-KResults of operations; Regulation FD disclosure· period Jul 21, 2026Document · Index
Jun 26, 2026ADTN ADTRAN Holdings, Inc.8-KDirector or officer change; Other events· period Jun 23, 2026Document · Index
May 18, 2026ADTN ADTRAN Holdings, Inc.8-KCharter, bylaws or fiscal year change; Shareholder vote results· period May 13, 2026Document · Index
May 5, 2026ADTN ADTRAN Holdings, Inc.10-QQuarterly report· period Mar 31, 2026Document · Index
May 5, 2026ADTN ADTRAN Holdings, Inc.8-KResults of operations; Regulation FD disclosure· period May 4, 2026Document · Index
May 5, 2026FN Fabrinet10-QQuarterly report· period Mar 27, 2026Document · Index
May 4, 2026FN Fabrinet8-KResults of operations· period May 4, 2026Document · Index
Apr 7, 2026ADTN ADTRAN Holdings, Inc.8-KDirector or officer change· period Apr 1, 2026Document · Index
Mar 27, 2026ADTN ADTRAN Holdings, Inc.DEF 14ADefinitive proxy statement· period Mar 27, 2026Document · Index
Feb 26, 2026ADTN ADTRAN Holdings, Inc.10-KAnnual report· period Dec 31, 2025Document · Index
Feb 26, 2026ADTN ADTRAN Holdings, Inc.8-KResults of operations; Regulation FD disclosure· period Feb 25, 2026Document · Index
Feb 12, 2026CIEN CIENA CORPDEF 14ADefinitive proxy statement· period Mar 26, 2026Document · Index
Feb 3, 2026FN Fabrinet10-QQuarterly report· period Dec 26, 2025Document · Index
Feb 2, 2026FN Fabrinet8-KResults of operations· period Feb 2, 2026Document · Index
Dec 12, 2025CIEN CIENA CORP10-KAnnual report· period Nov 1, 2025Document · Index

Related industries in Manufacturing

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Source

  • U.S. Securities and Exchange Commission, EDGAR company submissions (SIC code and description) and XBRL company facts. The SEC does not endorse OpenFilings.