Quick Comparison

Agency	Best For	Pricing Model	Min Budget	Specialization
OutreachBloom	Cold email specialists	Custom retainer	Not disclosed	Email-only outbound
Belkins	Enterprise multi-channel	Monthly retainer	$5,000/mo	Full-service SDR
SalesHive	Month-to-month flexibility	Monthly retainer	$5,000/mo	US-based SDRs
Callbox	Industry specialists	Monthly retainer	$5,000/mo	Industry verticals
Cleverly	LinkedIn-led outreach	Retainer or pay-per-lead	$1,000/mo	LinkedIn-first
CIENCE	Research-backed outbound	Monthly retainer	$4,200/mo	Custom list building
LevelUp Leads	Technical buyers	Monthly retainer	$3,000/mo	Tech/engineering
Martal	B2B tech companies	Monthly retainer	$4,000/mo	Technology sector
LeadCookie	Done-for-you SDRs	Per SDR/month	$3,500/mo	Dedicated reps
BookYourBook	Appointment setting	Monthly retainer	$2,500/mo	Meeting-focused
Oppgen	Account-based marketing	Custom	Not disclosed	ABM campaigns
Velocity	Fast ramp-up campaigns	Monthly retainer	$6,000/mo	Speed to market
GrowthAspects	Mid-market B2B	Monthly retainer	$3,000/mo	Full-funnel
Leadium	Research-heavy outreach	Monthly retainer	$4,500/mo	Deep personalization
RevBoss	Startups and early-stage	Monthly retainer	$2,000/mo	Startup-friendly
Televerde	Enterprise technology	Custom	Not disclosed	Enterprise demand gen
Operand	Full-funnel pipeline	Custom	Not disclosed	End-to-end management
Huge	Global outreach	Custom	Not disclosed	International markets
ABMnesia	Account-based marketing	Monthly retainer	$7,000/mo	ABM specialist
LeadGenius	Proprietary data outreach	Custom	Not disclosed	Data-first prospecting
LaunchPoint	Integrated demand gen	Custom	Not disclosed	Multi-channel demand

Most B2B companies hit the same wall: your product is solid, your existing customers are happy, but your pipeline isn't growing fast enough. You can hire SDRs internally (expensive, slow to ramp) or you can work with a lead generation agency that already has the systems, data, and processes dialed in.

The best B2B lead gen agencies don't just send emails. They research your ideal customer profile, build targeted prospect lists, craft personalized outreach, manage multi-channel campaigns, and hand you qualified meetings.

The 21 Best B2B Lead Generation Agencies

1. OutreachBloom

Best for: B2B companies that want reliable, done-for-you lead generation through cold email

OutreachBloom is a B2B lead generation agency built around cold email outreach. They handle the full pipeline: defining your ICP, building targeted prospect lists, setting up and warming dedicated sending domains, writing personalized email sequences, sending at scale, and managing replies.

What makes OutreachBloom stand out is their operational focus. Rather than offering a dozen services, they've gone deep on one channel and made it work consistently. They set up fresh domains with proper authentication, warm them properly, and launch campaigns only when deliverability is dialed in.

Their team filters and qualifies replies before forwarding them to you, so you're not sifting through out-of-office messages.

Best for: Startups and growing B2B companies that want consistent meetings without building internal SDR
Services: ICP definition, lead list building, domain infrastructure, copywriting, campaign management, reply qualification
Pricing: Custom (discovery call required)
Pros: Truly done-for-you, deep deliverability expertise, focused execution, no long-term lock-in
Cons: Cold email only (no phone or LinkedIn), requires discovery call for pricing

2. Belkins

Best for: Enterprise companies that need full-service, multi-channel lead generation

Belkins is one of the most established names in B2B lead generation. With over 800 clients served and more than 50,000 email variations tested, they bring serious scale. They combine cold email, LinkedIn outreach, cold calling, and appointment setting into coordinated campaigns.

Each client gets a team of researchers, copywriters, SDRs, and a project manager. Belkins handles everything from lead research and email deliverability to appointment setting and CRM integration.

Best for: Mid-market and enterprise B2B companies with larger budgets
Services: Cold email, LinkedIn outreach, appointment setting, lead research, SDR teams
Pricing: $5,000-$15,000/month
Pros: Massive scale, proven results, omnichannel campaigns, dedicated teams
Cons: Premium pricing, longer ramp-up time, may be overkill for small teams

3. SalesHive

Best for: Companies that want US-based sales reps with month-to-month flexibility

SalesHive offers B2B lead generation through US-based SDRs backed by their proprietary AI sales platform. They handle cold email, cold calling, and LinkedIn outreach with transparent pricing and month-to-month contracts.

The flexibility angle is their biggest draw. Most lead gen agencies lock you into 3-6 month commitments. SalesHive lets you scale up or down monthly.

Best for: Companies wanting to test outbound without long-term commitment
Services: Cold email, cold calling, LinkedIn outreach, dedicated US-based SDRs
Pricing: Starts around $5,000/month
Pros: Month-to-month contracts, US-based SDRs, transparent pricing, real-time analytics
Cons: Higher cost than offshore options, less email-specific depth than specialized agencies

4. Callbox

Best for: Enterprise B2B companies in tech, healthcare, and professional services

Callbox is a multi-channel B2B lead generation company with over 20 years of experience. They combine cold calling, email, LinkedIn, live chat, and webinars into account-based marketing campaigns.

Callbox's strength is industry specialization. They have dedicated teams for technology, healthcare, finance, manufacturing, and professional services.

Best for: Enterprise B2B companies in regulated or complex industries
Services: Cold calling, email marketing, LinkedIn, live chat, webinars, ABM
Pricing: Typically $5,000-$15,000/month
Pros: Deep industry expertise, 20+ year track record, multi-channel ABM
Cons: Enterprise-focused pricing, longer sales cycle, less agile than smaller firms

5. Cleverly

Best for: B2B companies that want LinkedIn-led lead generation with predictable costs

Cleverly started as a LinkedIn outreach agency and has expanded into cold email and multi-channel campaigns. They've analyzed data from thousands of LinkedIn campaigns.

Their pay-per-lead pricing model makes them unique. Instead of paying a flat retainer, you can pay based on qualified leads delivered.

Best for: Companies where decision-makers are active on LinkedIn
Services: LinkedIn outreach, cold email, pay-per-lead, LinkedIn content creation, LinkedIn advertising
Pricing: Pay-per-lead available, retainers from $1,000/month
Pros: LinkedIn expertise, pay-per-lead reduces risk, data-driven messaging
Cons: Email is a secondary channel, less deliverability depth, smaller operation than Belkins

6. CIENCE

Best for: Companies that need research-backed outbound with large SDR teams

CIENCE combines human researchers with AI-powered tools to build highly targeted prospect lists. They employ large teams of researchers who manually verify and enrich lead data before outreach.

Their GO Data platform provides access to a proprietary B2B contact database, and their SDR teams run email, phone, and LinkedIn campaigns.

Best for: Companies with complex, hard-to-target ICPs
Services: Lead research, data enrichment, cold email, cold calling, LinkedIn, SDR teams
Pricing: $4,200-$9,000+/month
Pros: Deep research capability, proprietary data, large SDR teams, multi-channel
Cons: Premium pricing, can be slow to ramp, complex onboarding

7. LevelUp Leads

Best for: SaaS and tech companies targeting technical buyers

LevelUp Leads specializes in the technology sector. They understand how to reach and engage technical decision-makers like CTOs, VP of Engineering, DevOps leads, and IT directors.

Their process combines ICP research, account-based targeting, cold email, LinkedIn, and phone outreach. Their copywriting for technical audiences is direct and technical.

Best for: Tech companies selling to engineering, IT, and technical leadership
Services: Cold email, LinkedIn, phone outreach, ICP research, account-based marketing
Pricing: Starts around $3,000/month
Pros: Tech sector expertise, understands technical buyers, account-based approach
Cons: Not ideal for non-tech industries, smaller team than enterprise agencies

8. Martal

Best for: B2B tech companies needing tech-aware outreach

Martal specializes in B2B technology lead generation. Their team understands technical products and can communicate complex value propositions clearly to technical buyers.

They offer both outbound lead generation and inbound lead qualification, covering the full funnel.

Best for: B2B technology companies with complex products
Services: Cold email, LinkedIn, phone, inbound qualification, account-based marketing
Pricing: From $4,000/month
Pros: Tech expertise, understands complex products, full-funnel approach
Cons: Higher pricing point, longer setup time

9. LeadCookie

Best for: Companies wanting done-for-you SDRs as a service

LeadCookie provides dedicated SDRs who work as an extension of your team. They handle the full outbound process: prospecting, outreach, and qualification.

Unlike agencies that pool resources, LeadCookie assigns dedicated reps who learn your business deeply.

Best for: Companies wanting dedicated SDR support without hiring internally
Services: Cold email, LinkedIn, dedicated SDRs, CRM management, reporting
Pricing: From $3,500/month per SDR
Pros: Dedicated reps, extension of your team, transparent reporting
Cons: Requires management overhead, higher cost than pooled agency models

10. BookYourBook

Best for: Companies focused on appointment setting

BookYourBook focuses exclusively on booking qualified meetings for your sales team. They handle prospecting, outreach, and qualification to hand off ready-to-buy prospects.

The appointment-first focus means they optimize for meeting quality rather than activity volume.

Best for: Companies with strong sales teams who need more qualified meetings
Services: Cold email, phone, appointment setting, qualification
Pricing: From $2,500/month
Pros: Meeting-focused, qualified handoffs, transparent reporting
Cons: Less emphasis on full-funnel strategy, meeting-focused only

11. Oppgen

Best for: Companies needing account-based marketing expertise

Oppgen specializes in multi-channel account-based marketing campaigns. They coordinate outreach across email, phone, LinkedIn, and direct mail for target accounts.

Their ABM approach is particularly effective for enterprise sales where you need to engage multiple stakeholders within target accounts.

Best for: Enterprise ABM campaigns targeting high-value accounts
Services: Multi-channel ABM, account research, coordinated outreach, direct mail
Pricing: Custom
Pros: ABM expertise, multi-channel coordination, enterprise experience
Cons: Enterprise pricing, longer sales cycles, complex setup

12. Velocity

Best for: Companies needing fast ramp-up and immediate results

Velocity Agency focuses on speed to lead. Their process is designed to get campaigns live quickly, with shortened discovery and setup phases.

For companies that need pipeline immediately, Velocity's accelerated onboarding is valuable.

Best for: Companies with urgent pipeline needs
Services: Cold email, LinkedIn, rapid deployment, performance optimization
Pricing: From $6,000/month
Pros: Fast ramp-up, quick to market, performance-focused
Cons: Premium pricing for speed, less emphasis on long-term strategy

13. GrowthAspects

Best for: Mid-market B2B companies wanting balanced approach

GrowthAspects serves mid-market B2B companies with a balanced approach to lead generation. They combine outbound tactics with inbound support for a full-funnel strategy.

Their mid-market focus means they understand the budget constraints and growth pressures of companies past startup stage but before enterprise scale.

Best for: Mid-market B2B companies needing full-funnel support
Services: Outbound, inbound, content marketing, account-based marketing
Pricing: From $3,000/month
Pros: Mid-market expertise, full-funnel approach, balanced strategy
Cons: Less specialized than focused agencies, broader but shallower

14. Leadium

Best for: Companies prioritizing research and data quality

Leadium emphasizes research-heavy outbound. Their team invests significant time in understanding each prospect before reaching out, resulting in highly personalized messaging.

For companies selling complex products to well-defined ICPs, Leadium's research-first approach produces higher quality engagement.

Best for: Complex B2B products requiring deep prospect research
Services: Research-heavy outreach, personalization at scale, data enrichment
Pricing: From $4,500/month
Pros: Deep research, high personalization, quality over quantity
Cons: Slower ramp-up, higher cost per lead, research-intensive

15. RevBoss

Best for: Startups and early-stage companies needing affordable outreach

RevBoss focuses on startup and early-stage B2B companies. They offer more accessible pricing than enterprise agencies while still providing quality outbound services.

Their startup focus means they understand early-stage constraints: limited budget, evolving messaging, and need for rapid iteration.

Best for: Startups and early-stage B2B companies
Services: Cold email, LinkedIn, messaging development, campaign management
Pricing: From $2,000/month
Pros: Startup-friendly pricing, understands early-stage challenges, flexible terms
Cons: Smaller team, less infrastructure than larger agencies

16. Televerde

Best for: Enterprise technology companies

Televerde serves enterprise technology companies with full-funnel demand generation. They combine outbound, inbound, and customer marketing into integrated programs.

Their enterprise tech focus means they understand complex sales cycles and multi-stakeholder buying processes.

Best for: Enterprise technology companies with complex sales
Services: Full-funnel marketing, outbound, inbound, customer marketing
Pricing: Custom
Pros: Enterprise tech expertise, full-funnel approach, global reach
Cons: Enterprise pricing, longer engagement cycles, complex setup

17. Operand

Best for: Companies wanting end-to-end pipeline management

Operand provides end-to-end pipeline management from prospecting through opportunity handoff. They manage the entire top of funnel so your sales team focuses on closing.

Their full-funnel approach means they handle strategy, execution, and optimization continuously.

Best for: Companies wanting to outsource entire top-of-funnel
Services: Full pipeline management, strategy, execution, analytics, optimization
Pricing: Custom
Pros: End-to-end management, comprehensive approach, strategic input
Cons: Premium pricing, requires significant trust and integration

18. Huge

Best for: Companies needing global B2B outreach

Huge provides B2B lead generation with global reach. They have teams across multiple time zones and can execute outreach campaigns internationally.

For companies selling globally or expanding into new markets, Huge's international footprint is valuable.

Best for: Companies needing international B2B outreach
Services: Global outbound, multi-language campaigns, international expertise
Pricing: Custom
Pros: Global reach, multi-language, international experience
Cons: Coordination complexity, higher cost for global footprint

19. ABMnesia

Best for: Companies dedicated to account-based marketing

ABMnesia specializes exclusively in account-based marketing. They help companies identify, target, and engage high-value accounts with coordinated campaigns.

Their ABM-only focus means deep expertise in this specific approach to B2B go-to-market.

Best for: Companies fully committed to ABM strategy
Services: Account identification, account research, multi-channel ABM campaigns, measurement
Pricing: From $7,000/month
Pros: ABM specialists, deep account expertise, proven frameworks
Cons: ABM-specific, higher entry point, requires ABM commitment

20. LeadGenius

Best for: Companies wanting proprietary data and technology

LeadGenius combines their proprietary data platform with human research. Their custom B2B database includes hard-to-find contact information and company insights.

For companies where off-the-shelf data isn't sufficient, LeadGenius's proprietary data can unlock inaccessible prospects.

Best for: Companies with difficult-to-reach target audiences
Services: Proprietary data access, custom research, multi-channel outreach
Pricing: Custom
Pros: Unique data assets, custom research capabilities, hard-to-reach prospects
Cons: Premium pricing, data-dependent value, longer setup

21. LaunchPoint

Best for: Companies wanting integrated demand generation

LaunchPoint combines lead generation with broader demand generation marketing. They integrate outbound with content, events, and marketing for a holistic approach.

For companies wanting to build brand alongside pipeline, LaunchPoint's integrated approach aligns activities across channels.

Best for: Companies wanting integrated demand gen and lead gen
Services: Outbound, content marketing, events, integrated campaigns
Pricing: Custom
Pros: Integrated approach, brand + pipeline alignment, holistic strategy
Cons: Broader focus means less depth in any single channel, higher complexity

How to Choose

Email-only focus: OutreachBloom delivers focused, fully managed cold email.

Omnichannel at scale: Belkins or Callbox bring dedicated teams across email, phone, LinkedIn.

Flexibility: SalesHive's month-to-month contracts let you test without commitment.

LinkedIn-focused: Cleverly has the deepest LinkedIn data and pay-per-lead pricing.

Complex ICP: CIENCE's research teams build custom prospect lists.

Technical buyers: LevelUp Leads writes outreach that resonates with CTOs and engineers.