Industry · SIC 3661
Telephone & Telegraph Apparatus
181 tracked issuers filing with the SEC under this industry classification.
Issuers
181
Recent filings
40
SIC code
3661
Industry overview
Telephone & Telegraph Apparatus
Telephone & telegraph apparatus producers in SIC 3661 design and manufacture switching systems, fiber and copper transmission gear, base station radios, PBX/VoIP gateways, optical network terminals, modems, and monitoring software for carriers, data centers, enterprises, and government networks. Customers range from Tier-1 telecom operators and cloud providers to utilities and large campuses that need resilient voice and data connectivity. Major risks include supply chain volatility for semiconductors, cybersecurity standards like FCC, NIST, and Common Criteria, export controls, spectrum and interoperability rules, and price pressure from open standards. In 2024-2025, the industry is pivoting to 5G Advanced rollouts, edge compute convergence, AI-driven traffic management, and replacement cycles that add post-quantum-ready encryption while reducing power draw. Vendors are also expanding service contracts—managed network upgrades, remote monitoring, lifecycle support, and SLAs—to stabilize recurring revenue and protect uptime. For the latest performance, view SEC filings on Earnings Feed today.
Source: Earnings Feed research · Nov 23, 2025
Latest filings
- 144CIENCIENA CORP15.8 KBSEC(opens sec.gov)
- 144CIENCIENA CORP6.3 KBSEC(opens sec.gov)
- 144CIENCIENA CORP6.1 KBSEC(opens sec.gov)
- 144CIENCIENA CORP6.1 KBSEC(opens sec.gov)
- 8-KCLROCLEARONE INC217.8 KBSEC(opens sec.gov)
- 8-KCLROCLEARONE INC165.1 KBSEC(opens sec.gov)
- 144VPLMVoip-pal.com Inc4.2 KBSEC(opens sec.gov)
- 8-KFIEEFiEE, Inc.198.2 KBSEC(opens sec.gov)
- 144CIENCIENA CORP5.4 KBSEC(opens sec.gov)
- 144CIENCIENA CORP4.7 KBSEC(opens sec.gov)
- 144CIENCIENA CORP4.7 KBSEC(opens sec.gov)
- 10-KFKWLFRANKLIN WIRELESS CORP7.8 MBSEC(opens sec.gov)
- 144CIENCIENA CORP5.4 KBSEC(opens sec.gov)
- 144CIENCIENA CORP4.7 KBSEC(opens sec.gov)
- 144VPLMVoip-pal.com Inc4.2 KBSEC(opens sec.gov)
- 144CIENCIENA CORP6.1 KBSEC(opens sec.gov)
- 144CIENCIENA CORP6.3 KBSEC(opens sec.gov)
- 144CIENCIENA CORP5.4 KBSEC(opens sec.gov)
- 144CIENCIENA CORP6.1 KBSEC(opens sec.gov)
- 6-KAUDCAUDIOCODES LTD10.4 KBSEC(opens sec.gov)
- 8-KFIEEFiEE, Inc.192.4 KBSEC(opens sec.gov)
- 4GUSTAFSSON ANDERS25.8 KBSEC(opens sec.gov)
- SCHEDULE 13D/AFIEEFiEE, Inc.287.2 KBSEC(opens sec.gov)
- 6-KAUDCAUDIOCODES LTD17.1 KBSEC(opens sec.gov)
- S-1/ACLROCLEARONE INC4.2 MBSEC(opens sec.gov)
- 10-QCIENCIENA CORP10.7 MBSEC(opens sec.gov)
- SCHEDULE 13G/ACIENCIENA CORP7.0 KBSEC(opens sec.gov)
- 144FNFabrinet4.4 KBSEC(opens sec.gov)
- 8-KCIENCIENA CORP4.0 MBSEC(opens sec.gov)
- 144AUDCAUDIOCODES LTD5.6 KBSEC(opens sec.gov)
- 8-KSONMDNA X, Inc.204.0 KBSEC(opens sec.gov)
- 8-KSONMDNA X, Inc.206.5 KBSEC(opens sec.gov)
- 8-KCLROCLEARONE INC155.6 KBSEC(opens sec.gov)
- 10-QSONMDNA X, Inc.6.9 MBSEC(opens sec.gov)
- 10-KFNFabrinet13.5 MBSEC(opens sec.gov)
- 8-KFNFabrinet974.2 KBSEC(opens sec.gov)
- 144CIENCIENA CORP6.0 KBSEC(opens sec.gov)
- 10-QFIEEFiEE, Inc.5.3 MBSEC(opens sec.gov)
- 144CIENCIENA CORP6.9 KBSEC(opens sec.gov)
- 10-QCLROCLEARONE INC10.3 MBSEC(opens sec.gov)
Featured issuers
- ACTIVE VOICE CORPCIK 0000869554
- ADC TELECOMMUNICATIONS INCCIK 0000061478
- ADTRAN Holdings, Inc.CIK 0000926282ADTN
- ADVANCED FIBRE COMMUNICATIONS INCCIK 0000898805
- ADVANCED SWITCHING COMMUNICATIONS INCCIK 0001095583
- ADVANCED VOICE TECHNOLOGIES INCCIK 0000932694
- AEIRE CORPCIK 0000003398
- AirTouch Communications, Inc.CIK 0001403720
- AIRVANA INCCIK 0001116435
- ALCATEL LUCENTCIK 0000886125
- ALCATEL-LUCENT USA INC.CIK 0001006240
- ALCATEL USA INCCIK 0000316004
Classification
- SIC code
- 3661
- Total issuers
- 181
- Recent filings
- 40