Telephone & Telegraph Apparatus
170 tracked issuers filing with the SEC under this industry classification.
Issuers
170
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
- 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 - 8-KSYCAMORE NETWORKS INC
SYCAMORE NETWORKS INC 8-K
Dec 23, 4:42 PM ET122.9 KB - 4ADC TELECOMMUNICATIONS INC
ADC TELECOMMUNICATIONS INC 4
Dec 23, 4:42 PM ET8.3 KB - 8-KTELVUE CORP
TELVUE CORP 8-K
Dec 23, 4:20 PM ET6.4 KB - 4CIENA CORP$CIEN
CIENA CORP 4
Dec 23, 4:15 PM ET5.4 KB - 4CIENA CORP$CIEN
CIENA CORP 4
Dec 23, 4:10 PM ET5.4 KB - 4CIENA CORP$CIEN
CIENA CORP 4
Dec 23, 4:08 PM ET5.4 KB - 8-KXETA TECHNOLOGIES INC
XETA TECHNOLOGIES INC 8-K
Dec 23, 4:04 PM ET37.4 KB - 4ADC TELECOMMUNICATIONS INC
ADC TELECOMMUNICATIONS INC 4
Dec 23, 1:52 PM ET5.9 KB - 6-KALVARION LTD
ALVARION LTD 6-K
Dec 23, 7:25 AM ET21.4 KB - 4ECTEL LTD
ECTEL LTD 4
Dec 9, 7:04 PM ET7.1 KB - 4XETA TECHNOLOGIES INC
XETA TECHNOLOGIES INC 4
Dec 8, 6:08 PM ET7.6 KB - 10-QDITECH NETWORKS INC
DITECH NETWORKS INC 10-Q
Dec 8, 5:27 PM ET1.4 MB - SC 13DQiao Xing Mobile Communication Co., Ltd.
Qiao Xing Mobile Communication Co., Ltd. SC 13D
Dec 8, 4:47 PM ET6.6 KB - 4INFINERA CORP
INFINERA CORP 4
Dec 8, 4:41 PM ET7.7 KB - 4ZHONE TECHNOLOGIES INC
ZHONE TECHNOLOGIES INC 4
Dec 8, 3:57 PM ET10.0 KB - 4XETA TECHNOLOGIES INC
XETA TECHNOLOGIES INC 4
Dec 8, 8:58 AM ET6.2 KB - 6-KALVARION LTD
ALVARION LTD 6-K
Dec 8, 8:00 AM ET23.4 KB - 8-KNMS COMMUNICATIONS CORP
NMS COMMUNICATIONS CORP 8-K
Dec 5, 5:53 PM ET79.7 KB - 8-KDITECH NETWORKS INC
DITECH NETWORKS INC 8-K
Nov 20, 4:01 PM ET379.0 KB - 4ALTIGEN COMMUNICATIONS INC
ALTIGEN COMMUNICATIONS INC 4
Nov 20, 2:37 PM ET7.4 KB - 4ALTIGEN COMMUNICATIONS INC
ALTIGEN COMMUNICATIONS INC 4
Nov 20, 2:33 PM ET7.4 KB - 4ALTIGEN COMMUNICATIONS INC
ALTIGEN COMMUNICATIONS INC 4
Nov 19, 5:07 PM ET12.8 KB - 4ALTIGEN COMMUNICATIONS INC
ALTIGEN COMMUNICATIONS INC 4
Nov 19, 5:03 PM ET11.4 KB - 8-KTHINKENGINE NETWORKS, INC.
THINKENGINE NETWORKS, INC. 8-K
Nov 19, 4:30 PM ET5.6 KB - 10-QOrsus Xelent Technologies Inc
Orsus Xelent Technologies Inc 10-Q
Nov 19, 4:10 PM ET897.4 KB - 4ZHONE TECHNOLOGIES INC
ZHONE TECHNOLOGIES INC 4
Nov 19, 3:35 PM ET13.1 KB - 4ALTIGEN COMMUNICATIONS INC
ALTIGEN COMMUNICATIONS INC 4
Nov 19, 3:32 PM ET12.8 KB - 4ShoreTel Inc
ShoreTel Inc 4
Nov 19, 2:52 PM ET9.5 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
AIRVANA INC
CIK 0001116435
ALCATEL LUCENT
CIK 0000886125
ALCATEL-LUCENT USA INC.
CIK 0001006240
ALCATEL USA INC
CIK 0000316004
ALTIGEN COMMUNICATIONS INC
CIK 0001003607
Classification
- SIC Code
- 3661
- Total Issuers
- 170
- Recent Filings
- 40