Independent list · re-checked September 28, 2026 · published by Primortul LLC

Leadium

Leadium is a US-based sales development agency at 11035 Lavender Hill Drive in Las Vegas, founded in 2015 by CEO Kevin Warner and Sergey Olexa, with a 100 percent US-based SDR team. It provides outbound appointment setting, inbound lead qualification, data sourcing, email, phone and LinkedIn prospecting and sales gifting, and names Segment, SignalWire, Phunware, Bottomline, Veem and People.ai among clients. Clutch ranks it first on its US lead generation page with a 5.0 rating across 76 reviews and 50-249 staff. Nobody pays to be ranked.

Why it’s hereTop-ranked on Clutch's US lead generation list with 76 five-star reviews and an all-US SDR workforce. Number 8 of the lead generation companies in the US.

Who leads itKevin Warner, Co-founder and CEO.

Estimated cost

Estimated: $8,000–$25,000/mo, typical for US lead generation retainers; not a quote.

Typical industry estimate, not a quote from any firm on this list.

A fit forB2B sales teams that want to outsource outbound prospecting, including cold email, cold calling, LinkedIn outreach and appointment setting, on month-to-month contracts.

Based in
Las Vegas, NV
Founded
2015
Team size
51–200 people
Led by
Kevin Warner, Co-founder and CEO
Known for
outbound appointment setting · inbound lead qualification · lead research and data sourcing · omni-channel prospecting · deliverability and sales technology
Named clients
Segment, OpenEdge, SignalWire, Phunware, Bottomline, PFL, Veem, People.ai
Best for
B2B sales teams that want to outsource outbound prospecting, including cold email, cold calling, LinkedIn outreach and appointment setting, on month-to-month contracts.
Estimated cost

Estimated: $8,000–$25,000/mo, typical for US lead generation retainers; not a quote.

Typical industry estimate, not a quote from any firm on this list.

Office
11035 Lavender Hill Drive, Suite 160 · Las Vegas, NV · 89135
Leadium homepage, captured September 28, 2026
leadium.com · homepage on September 28, 2026

Sources leadium.com, clutch.co · LinkedIn ↗

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