Telephone & Telegraph Apparatus
182 tracked issuers filing with the SEC under this industry classification.
Issuers
182
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 live SEC filings on EarningsFeed today.
Source: Earnings Feed research · 11/23/2025
Latest Filings
- 144CIENA CORP$CIEN
CIENA CORP 144
Jan 5, 6:04 PM ET15.6 KB - 8-KSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 8-K
Dec 31, 7:15 AM ET212.3 KB - 8-KCLEARONE INC$CLRO
CLEARONE INC 8-K
Dec 30, 5:00 PM ET657.1 KB - 10-KVoip-pal.com Inc$VPLM
Voip-pal.com Inc 10-K
Dec 23, 5:16 PM ET6.8 MB - 8-KFRANKLIN WIRELESS CORP$FKWL
FRANKLIN WIRELESS CORP 8-K
Dec 23, 5:00 PM ET194.3 KB - 8-KSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 8-K
Dec 18, 8:55 AM ET872.7 KB - 8-KClearfield, Inc.$CLFD
Clearfield, Inc. 8-K
Dec 12, 5:00 PM ET420.9 KB - 10-KCIENA CORP$CIEN
CIENA CORP 10-K
Dec 12, 1:42 PM ET17.0 MB - 8-KFabrinet$FN
Fabrinet 8-K
Dec 12, 6:07 AM ET152.2 KB - 8-KADTRAN Holdings, Inc.$ADTN
ADTRAN Holdings, Inc. 8-K
Dec 11, 4:05 PM ET264.0 KB - 8-KCIENA CORP$CIEN
CIENA CORP 8-K
Dec 11, 7:07 AM ET5.2 MB - 8-KSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 8-K
Dec 5, 8:00 AM ET216.4 KB - 8-KCIENA CORP$CIEN
CIENA CORP 8-K
Dec 3, 5:34 PM ET144.5 KB - 8-KFiEE, Inc.$FIEE
FiEE, Inc. 8-K
Dec 2, 4:45 PM ET326.2 KB - 8-KSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 8-K
Nov 26, 4:05 PM ET307.7 KB - 10-KClearfield, Inc.$CLFD
Clearfield, Inc. 10-K
Nov 25, 5:10 PM ET10.5 MB - 8-KClearfield, Inc.$CLFD
Clearfield, Inc. 8-K
Nov 25, 7:00 AM ET436.7 KB - 8-KClearfield, Inc.$CLFD
Clearfield, Inc. 8-K
Nov 17, 4:15 PM ET409.9 KB - 10-QCLEARONE INC$CLRO
CLEARONE INC 10-Q
Nov 14, 4:01 PM ET8.6 MB - 10-QFRANKLIN WIRELESS CORP$FKWL
FRANKLIN WIRELESS CORP 10-Q
Nov 14, 9:31 AM ET5.1 MB - 8-KSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 8-K
Nov 13, 4:05 PM ET198.2 KB - 10-QFiEE, Inc.$FIEE
FiEE, Inc. 10-Q
Nov 12, 11:45 AM ET4.3 MB - 8-KFiEE, Inc.$FIEE
FiEE, Inc. 8-K
Nov 12, 11:10 AM ET279.4 KB - 6-KAUDIOCODES LTD$AUDC
AUDIOCODES LTD 6-K
Nov 5, 11:31 AM ET11.0 KB - 10-QADTRAN Holdings, Inc.$ADTN
ADTRAN Holdings, Inc. 10-Q
Nov 4, 1:28 PM ET23.9 MB - 8-KFRANKLIN WIRELESS CORP$FKWL
FRANKLIN WIRELESS CORP 8-K
Nov 4, 1:00 PM ET194.7 KB - 6-KAUDIOCODES LTD$AUDC
AUDIOCODES LTD 6-K
Nov 4, 8:02 AM ET193.9 KB - 8-KADTRAN Holdings, Inc.$ADTN
ADTRAN Holdings, Inc. 8-K
Nov 4, 7:00 AM ET17.0 MB - 10-QFabrinet$FN
Fabrinet 10-Q
Nov 4, 6:16 AM ET8.2 MB - 8-KFabrinet$FN
Fabrinet 8-K
Nov 3, 4:21 PM ET434.2 KB - 10-QNETGEAR, INC.$NTGR
NETGEAR, INC. 10-Q
Oct 31, 4:08 PM ET15.9 MB - 8-KCLEARONE INC$CLRO
CLEARONE INC 8-K
Oct 31, 8:30 AM ET193.2 KB - 10-QSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 10-Q
Oct 31, 8:16 AM ET6.1 MB - 8-KSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 8-K
Oct 31, 8:05 AM ET312.4 KB - 8-KFiEE, Inc.$FIEE
FiEE, Inc. 8-K
Oct 30, 4:30 PM ET209.3 KB - 8-KCLEARONE INC$CLRO
CLEARONE INC 8-K
Oct 30, 4:00 PM ET703.7 KB - 3KOUREY MICHAEL R
KOUREY MICHAEL R 3
Oct 29, 9:40 PM ET9.9 KB - 8-KNETGEAR, INC.$NTGR
NETGEAR, INC. 8-K
Oct 29, 4:29 PM ET2.5 MB - 8-KClearfield, Inc.$CLFD
Clearfield, Inc. 8-K
Oct 29, 10:30 AM ET222.0 KB - 8-KSONIM TECHNOLOGIES INC$SONM
SONIM TECHNOLOGIES INC 8-K
Oct 24, 8:00 AM ET227.7 KB
Featured Issuers
12ACTIVE VOICE CORP
CIK 0000869554
ADC TELECOMMUNICATIONS INC
CIK 0000061478
- $ADTN
ADTRAN Holdings, Inc.
CIK 0000926282
ADVANCED FIBRE COMMUNICATIONS INC
CIK 0000898805
ADVANCED SWITCHING COMMUNICATIONS INC
CIK 0001095583
ADVANCED VOICE TECHNOLOGIES INC
CIK 0000932694
AEIRE CORP
CIK 0000003398
AirTouch Communications, Inc.
CIK 0001403720
AIRVANA INC
CIK 0001116435
ALCATEL LUCENT
CIK 0000886125
ALCATEL-LUCENT USA INC.
CIK 0001006240
ALCATEL USA INC
CIK 0000316004
Classification
- SIC Code
- 3661
- Total Issuers
- 182
- Recent Filings
- 40