- Universal Time Equipment Co
- Unlimited Sprinkler Fire
- Urban Fire Protection
- US-Safety
- Utilities Control Inc
- Valdosta Technical Systems
- Vanguard Answering Svc Inc
- Vanguard Escondido
- Vanwell Electronics Inc
- Vector Security
- Vematech Inc
- Versatronix
- Victory Sound Communications
- Virginia Carolina Electronics
- Virginia Fire Protection
- Vista Fire Sprinkler Co
- Vista Fire Sprinkler Co
- Vitel Communications
- Vitel Communications
- Vitel Communications
- Volunteer Security Inc
- Volunteer Security Inc
- Volunteer Technology Systems
- W R Bevans Fire Alarm Inc
- Wade Mitchell Assoc
- Walker Alarm Co
- Wasatch Safety
- Washington Fire Alarm
- Watch Guard Of Potomac
- WEBB Mills Fire Alarm Non-Emer
- Wel-Design Alarm System Inc
- Wel-Design Alarm System Inc
- Wellington Security
- Wellington Security Systems
- West Alert
- Westchester Fire Extinguisher
- Westchester Security Corp
- Western States Fire Protection
- Wfi Suntech
- Wheeler Systems
- White Life-Safety Systems
- Williams Fire & Hazard Control
- Willimantic Switchboard Assn
- Wilmington Fire Guard
- Wilson Fire Equipment & Svc Co
- Wilson Fire Equipment & Svc Co
- Wiregrass Systems Inc
- Wiring Plus
- Wolverine Fire Protection Co
- Wood Electronics
- World Life Safety Inc
- Wright Signal LLC
- WSA Atlanta Inc
- WSA Inc
- WSA Systems
- WSA Systems Inc
- Yong Kim Min
- YPS Integrated Systems
- Yukon Fire Protection Svc