Choosing a B2B outsourced sales partner (8 Top companies)

Here’s an insider secret. Full-cycle sales outsourcing agencies rarely work.

In our co-founder Michael Maximoff’s 8+ years of experience, these one-stop-shop vendors deliver only 70% of deliverables and achieve merely 50% of projected results.

You’re more likely to succeed if you partially outsource your sales activities to specialized agencies. 

After researching dozens of B2B sales outsourcing companies, we’ve settled on this list of the 8 best firms for a range of use cases. These providers have mastered specific segments of the sales process, offering specialized solutions that accelerate each stage of the funnel.

We found one suited for prospecting, a sales training firm, an account-based marketing (ABM) vendor, plus our agency, Belkins, the only outsourced B2B lead generation company in the top 100 Clutch “Best of List”.

Of course, these top selections aren’t necessarily the best choice for everyone. That’s why you’ll see runner-ups within this post, each with their specialized offerings, strengths, and reviews of their ideal clients.

8 best B2B sales outsourcing companies

Belkins: Best for outsourcing lead generation and appointment setting

Industry focus: Technology, manufacturing, marketing and creative agencies, construction, consulting, recruitment and staffing, logistics, healthcare, SaaS, and financial services

Notable clients: Cisco, GE HealthCare, Berkeley College, Sekisui, Citcon, Columbus Chamber of Commerce

Pricing: Starts at $5,500. Final pricing varies based on individual cases (e.g., market specifics, number of channels). Belkins offers 3 basic packages, alongside flexible options to match your expectations and unique goals.

Note: All plans represent estimated ranges and vary based on individual cases.

Belkins (that’s us 👋🏻) is an award-winning sales outsourcing agency, delivering 400+ qualified appointments annually. Our world-class specialists and playbooks, shaped from working with over 1,000 clients across 50+ industries, are the reason we exceed targets repeatedly.

Why choose Belkins:

• Bespoke strategies: You get a unique playbook that’s unlike any other in the market. These tailored go-to-market (GTM) strategies align with your business goals, target market, strengths, and weaknesses. All our approaches are continuously updated for optimal performance.
• Granular lead research with advanced profiling: Without knowing your buyers inside out, it’s impossible to identify the decision-makers, let alone persuade them to attend a meeting. At Belkins, every lead is manually verified by our lead research specialists. We dive deep into each lead’s role, desires, challenges, tech stack, and decision-making process, guaranteeing you engage with the highest-fit leads.
• End-to-end strategy implementation: Outsource your entire deal generation, all the way from strategy development to optimization. When you work with Belkins, you don’t just improve your sales numbers; you transform your entire revenue engine with sustainable frameworks that continue generating results — even after our engagement ends.
• Cross-functional and cross-channel approaches: Even though Belkins operates as an outbound lead generation and sales appointment setting agency, we often work with specialists across other fields like SEO, paid ads, and branding. Gain access to these dedicated experts — alongside our world-class team of account managers, content writers, email deliverability specialists, SDRs, and lead research specialists — to accelerate your pipeline velocity via an omnichannel strategy.
• Ongoing strategy improvements: Don’t react — anticipate. As a client, you’re equipped with market insights and strategy pivots to stay ahead of industry shifts. Running out of leads within your ideal customer profile (ICP)? We’ll experiment with complementary job titles or expand to adjacent sub-industries. Continue to receive an uninterrupted flow of quality leads no matter what happens.
• Proprietary tools: Access our proprietary tech stack (Forderly, Charge, and Frostbite) at no additional cost. Each tool is built from our frontline experience across 50+ industries. Tap into quality databases, reveal hidden insights, and launch campaigns that drive high-value action.

Deep dive into our unique approach: 

• How we use clients’ ideal customer profiles (ICPs) in lead generation campaigns
• How we approach and refine value propositions for B2B campaigns
• The B2B lead qualification process we use for our clients’ campaigns

Awards:

• OA500 Top 500 Global Outsourcing Firm Index 2024
• Inc. Regionals 2024: Mid-Atlantic
• Clutch Top Appointment Setting Company 2024
• Clutch Top Lead Generation Company 2024 (Note: Belkins was the only company in the lead gen space in the top 100)
• Corporate Vision Most Innovative B2B Lead Generation Agency 2024 — East Coast U.S.A.

Case studies:

• A leading startup investment platform hired Belkins to streamline its lead generation efforts after experiencing fragmented collaboration with other vendors. Our team got to work, turning its original email outreach campaign into an omnichannel strategy. In 15 months, it saw 346 appointments with a 125% ROI. The client was so impressed by our campaign performance that it extended the contract for another year.
• When IGS, a fired heater service provider, engaged Belkins to boost its lead-to-appointment conversions, we exceeded targets. Our team conducted extra lead research to find more high-value prospects and tailored each email campaign to highlight different offerings and value propositions for each ICP. The results: 120% average monthly KPIs and 330 annual appointments.
• LinkedIn is tough to crack. And Belkins overdelivered for Omnicharge, a power banks and charging stations manufacturer. Besides sending a demo unit to interested prospects and improving its SEO and LinkedIn content, we launched an influencer program. The power solutions manufacturer eventually saw 320+ qualified appointments in just 12 months.

Belkins has helped companies from 50+ industries supercharge their pipeline growth. Read their success stories.

Runner-ups:

(i) Martal Group

Who it’s for: Tech enterprises

What it does: Outbound and inbound lead generation, appointment setting, sales outsourcing, sales training, and an AI sales platform.

What it does best: Full-cycle support. Martal Group assigns fractional Sales Executives (SEs) as account managers even after the deals are signed.

Belkins reminder: Hiring a third-party provider to handle the entire sales team outsourcing process is notoriously difficult to pull off. It’s rare for a jack-of-all-trades agency to excel in prospecting, nurturing, closing, and retention.

As such, we don’t recommend it.

A better alternative is outsourcing specific stages in the pipeline. This way, you tap into specialized expertise and drive sustainable engagement throughout your funnel.

(i) CIENCE

Who it’s for: Companies seeking tech-first providers

What it does: Outbound, inbound, and local SDR; GTM setup; and data solutions

What it does best: CIENCE offers accurate and globally compliant data across 149 industries in the U.S., making it a strong contender if you’re expanding into the U.S. market

Revit: Best for a pay-for-appointment model

Industry focus: SMBs and startups in IT, business consulting, and more

Notable clients: BAROS International, SCADEMY, Umbrelly, and Hustler Marketing

Pricing: Custom quote. Revit’s pay-per-appointment plan involves a lower retainer fee compared to its fractional SDR department solution.

Revit’s flexible pay-for-appointment model lets you freely adjust your appointment volume with no long-term commitment — scaling only when your pipeline requires it.

Strengths:

• No long-term contracts: The absence of contractual lockdowns makes Revit ideal for early-stage startups with modest budgets. Clients highlight the agency’s flexibility around additional agreements and processes. 
• Scalability: Dial your appointment volume up or down based on budget or business demands. With Revit, you’ll never waste resources during sales lulls or miss opportunities when business is finally ramping up.
• Accurate contact research: Revit has a proven process for manually validating your target audience’s names, job titles, and email addresses — even discovering prospects missed by list-building platforms like ZoomInfo and Apollo.

Awards: While newer to the lead generation space, Revit has earned testimonials praising its quality leads, communication responses, and agile campaign adjustments.

Case studies:

• Revit partnered with a visitor engagement platform to secure 5 qualified appointments within 2 weeks. The software company subsequently increased from 5 to 15 appointments per month. Now in its extended partnership, the company credits its pipeline growth to the agency’s industry knowledge, deep analysis, and adaptability.

Runner-up:

(i) ViB Appointments

Who it’s for: Companies seeking qualified appointments with tech buyers

What it does: Appointment setting using a pay-per-qualified-meeting-held model and community-based approach

What it does best: Exclusive community access. ViB unlocks direct connections to its tech industry decision-makers

Outbound Consulting: Best for small businesses

Industry focus: SMBs in software, agencies, consulting, and more

Notable clients: Constant Contact, Havas, and Detecon Consulting

Pricing: Custom quotes with packages for 4, 6, and 12 months

Small and medium-sized businesses (SMBs) usually struggle to cut through the noise and generate consistent leads due to limited resources. That’s where Outbound Consulting’s extensive track record makes it the ideal partner.

Strengths:

• Specialty in SMB growth: Outbound Consulting specializes in solving SMBs’ common challenges: limited bandwidth and over-reliance on referrals. In 10+ years of partnering with these businesses, the agency’s mastered proven processes to build predictable pipelines and achieve your outreach goals.
• Impressive track record: This vendor has partnered with over 2,000 SMBs across 25 industries, consistently securing 1–3 new deals per month.
• High-touch coaching: Outbound Consulting improves your sales approach by acting as both partner and coach for long-term success. No matter what package you choose, you’ll master practices and techniques like turning positive responses into closed deals.

Awards: None yet, but the vendor’s received numerous testimonials from 2,000+ SMBs in over a decade.

Case studies:

• In its 3.5 years of working with TribalVision, Outbound Consulting doubled its monthly appointments with a 30% close rate. This was achieved after the agency refined its unique selling proposition (USP), messaging, and target buyers.

Runner-ups:

(i) Leadium

Who it’s for: SMBs seeking boutique support

What it does: Appointment setting, data sourcing, and inbound lead qualification

What it does best: Industry-leading contact data sourcing that captures specific custom data points

(ii) SalesBread

Who it’s for: Small IT businesses

What it does: Lead generation through LinkedIn and cold email outreach

What it does best: LinkedIn outreach with high-touch onboarding

Ironpaper: Best for account-based marketing (ABM)

Industry focus: IT, SaaS, energy, and cloud/data

Notable clients: Goddard Technologies, mFormation, and Nokia

Pricing: Custom quotes, but reviews show its minimum project size starts from $10,000

Ironpaper commands years of experience in highly competitive sectors. It’s suitable for companies seeking a strategic partner to accelerate their traction with target accounts in complex sales cycles.

Strengths:

• Proven methodology: Ironpaper’s battle-tested system (called Ironpaper Growth Engine) builds engagement and relationships with your target accounts, ensuring your brand always stays top of mind.
• Deep experience in competitive fields: Ironpaper dominates in sectors affected by economic shifts, regulatory changes, and technology disruptions. It’s adept at cutting through challenging business models and extended sales cycles with measurable ROI.

Awards:

• New York’s Top Technology Marketing Agency 2025

Case studies:

• After refining its messaging, online presence, and buyer pathways, Ironpaper helped Lightning Step establish a sustainable growth foundation. The agency engaged with 15 enterprise accounts and drove $700K in closed-won deals.

Runner-ups:

(i) Belkins

Who it’s for: Mid-sized companies and enterprises entering new markets and segments, struggling with a limited total addressable market (TAM), or targeting decision-makers in niche industries

What it does: Bespoke ABM strategies customized to your specific needs, challenges, competitive advantages, and market position.

What it does best: Tailored ABM campaigns powered by advanced research and continuous optimization, ensuring a predictable pipeline of qualified leads. Despite dealing with a limited TAM in a technical niche, Belkins helped Celerway unlock numerous target accounts. In the end, we delivered 97 appointments in just 10 months.

(ii) Clickroads

Who it’s for: Mid- and large-sized tech companies

What it does: ABM, paid ads, and B2B branding

What it does best: Precision-targeted ad campaigns that boost awareness and retarget prospects through the funnel, resulting in higher conversion rates.

RAIN Group: Best for sales training and consulting 

Industry focus: Professional services, tech, life science, and finance

Notable clients: Toyota, Canon, Optus, Covetrus, and FLIR

Pricing: Varies. RAIN Group offers multiple onsite and virtual training sessions, many of which involve custom quotes. Its online self-paced sales prospecting programs cost $199 per month.

RAIN Group is an award-winning sales training firm that supports your team at every stage of the sales cycle. From onsite training to flexible self-paced study programs, it delivers a learning experience that works for everyone.

Strengths:

• Diverse programs: Choose from specialized programs in prospecting, high-stakes negotiation, sales management, virtual selling, and more. RAIN Group also offers training for first-time managers and sales managers leading in the AI era.
• Multiple learning modes: Eliminate scheduling conflicts and travel expenses. With RAIN Group’s flexible learning modes — self-paced lessons, intensive onsite workshops, or hybrid programs — ensure hassle-free participation and knowledge retention.
• RAIN selling methodology: The methodology, which stands for Rapport, Aspirations and Afflictions, Impact, and New Reality, guides you on how to lead a customer-centric sales conversation confidently.

Awards:

• Selling Power Top Sales Training Companies 2025
• Stevie Awards Gold – Global Sales Team of the Year 2025
• Stevie Awards Silver – Sales Training Program of the Year 2025

Case studies:

• Xylem’s senior sellers completed RAIN Group’s self-study program to sharpen their negotiation tactics. They mastered the content with scores over 80% across all modules and reported significant improvements in confidence throughout the negotiation cycle.

Runner-ups:

(i) Belkins

Who it’s for: Mid-sized companies and enterprises aiming to improve inbox placement and their revenue team’s efficiency

What it does: Email deliverability consulting that addresses critical issues (e.g., blacklisting, poor domain health) and HubSpot CRM consulting to maximize your CRM

What it does best: CRM customization to improve your sales process, align marketing and sales, and win more deals. Black Hills AI achieved a 50% reduction in CRM costs, a 20% increase in productivity, and a 10% boost in lead-to-customer conversion rate after hiring Belkins to migrate its data from Salesforce to HubSpot.

(ii) Abstrakt

Who it’s for: Large companies optimizing their revenue operations through Salesforce

What it does: Salesforce data migration, custom integration, and workflow optimization

What it does best: Full data migration that eliminates siloes

memoryBlue: Best for international sales 

Industry focus: B2B high tech, including SaaS, IT, and cybersecurity

Notable clients: Box, Couchbase, Cloudera, McAfee, and MobileIron

Pricing: Custom quotes with the minimum project size starting at $5,000+

Expand your global reach with memoryBlue’s extensive network — powered by its alumni ecosystem and acquisition of Operatix. Revenue leaders can launch into new regions in weeks, not months.

Strengths:

• International markets: memoryBlue supports companies across LATAM, EMEA, and APAC. Its multilingual team, strategically positioned across the US, Europe, and Singapore, engages prospects in 20+ languages for authentic regional connections.
• Sales recruitment: memoryBlue boasts an elite pool of trained and vetted sales talent for its sales operations and clients’ teams. These SDRs command high salaries — 84% earn over $100K — reflecting their expertise and results.

Awards:

• Inc. 5000 honoree 2024

Case studies:

• Stem entered new markets quickly, thanks to the spot-on messaging and incremental improvements delivered by the sales team at memoryBlue. The client was so impressed that they invited one of the SDRs to join them as a full-time employee.

Runner-ups:

(i) Sales Focus Inc

Who it’s for: International companies entering the U.S. market with a dedicated sales team.

What it does: Outside sales, inside sales, appointment setting, and international sales using its proprietary S.O.L.D.™ Process methodology.

What it does best: Rapid market penetration. Sales Focus Inc. launches your sales program in 45 days or less.

(ii) Callbox

Who it’s for: Companies seeking qualified opportunities across North America, Asia-Pacific, Latin America, and EMEA.

What it does: Cross-border marketing, webinar and virtual event marketing, ABM, and lead generation

What it does best: Fast-track market entry combining AI and human expertise

Superhuman Prospecting: Best for sales prospecting and list building

Industry focus: Tech, commercial insurance, education, IT, and managed services

Notable clients: Waterpik, Amazon, and Uber

Pricing: Starts at $2.50/contact. Call-focused campaigns begin at $1,125/month; full-service and multi-channel campaigns start from $2,950/month.

Superhuman Prospecting (SHP) specializes in outbound prospecting through its human-to-human (H2H) sales principle. All SHP’s cold callers are trained and certified in its unique methodology. 

Strengths:

• H2H Sales Scripts™ methodology: SHP meticulously tailors its cold calling scripts using the H2H method for each client. Refined through 6 years of analysis of thousands of B2B cold call campaigns, it covers everything from philosophy and values to strategy and frameworks. 

Awards:

• Philadelphia100® list 2021

Case studies:

• Out of 1,356 calls, SPH delivered 82 leads and 50 booked appointments for Waterpik, generating an immediate sales pipeline for its new oral care tools.

Runner-ups:

(i) SalesRoads

Who it’s for: Mid-market companies and enterprises

What it does: List building, outbound calling and emailing, and SDR outsourcing

What it does best: B2B lead lists with 98%+ accuracy

(ii) ColdIQ

Who it’s for: B2B companies earning over $100K/month

What it does: End-to-end cold outreach campaigns, including email infrastructure setup, list building, inbox automation, and campaign optimization

What it does best: Outbound trigger-based campaigns (e.g., buying signals like new office openings, recent acquisitions)

Callbox: Best for B2B telemarketing

Industry focus: IT, software, medical and healthcare, marketing and advertising, business services, HR, logistics, financial services, and manufacturing

Notable clients: HP, Zendesk, Intel, and Acer

Pricing: Custom quotes, with most common project sizes ranging from $10,000 to $49,999.

Callbox is a global leader in the outsourced B2B lead generation space, with offices in the U.S., the U.K., Australia, New Zealand, Singapore, Colombia, and Hong Kong. Its multi-region expertise allows companies to expand into untapped international markets with localized strategies.

Strengths:

• International sales data: Callbox owns a global database of companies and contacts across industries and regions. All lists are AI-enhanced and human-curated. This makes it the premier choice for companies seeking a go-to-market (GTM) strategy in international markets.

Awards:

• Clutch Best Sales Outsourcing for Financial Services 2025
• The Manifest Best Third-Party Verification Agencies 2025
• HiredSupport Top Call Center Companies in California 2025

Case studies:

• Delivering 96 marketing-qualified leads (MQLs) and 163 sales appointments, Callbox helped a financial services company successfully grow its US footprint despite being well-established globally.

Runner-ups:

(i) Intelemark

Who it’s for: B2B companies with time-sensitive calling campaigns

What it does: Telemarketing lead generation and consulting, customer retention services, and database cleanup

What it does best: Emergency telemarketing that drives event attendance, qualified leads, and appointments quickly within a tight time frame

(ii) EBQ

Who it’s for: Companies seeking all-bound telemarketing support

What it does: CRM, appointment setting, marketing, sales, data, and customer experience

What it does best: Prospect nurturing through multiple channels, including emails, paid search, and social media

How we evaluated these top sales outsourcing companies

We handpicked these sales outsourcing firms based on:

• Industry conversations: We noticed these outsourced sales companies across forums, peer review platforms, and “dark social” channels like Slack.
• Client conversations: Our sales team spoke to dozens of B2B clients, inquiring which vendors they evaluated before choosing Belkins. Unsurprisingly, many clients discovered them on AI search platforms like ChatGPT rather than through traditional searches.
• Agency specialties: Generic services are out. Specialized expertise is in. We didn’t just pick the best B2B sales outsourcing companies as voted by the masses; we also prioritize vendors with niche expertise in their fields.

How to pick the best B2B sales outsourcing company 

Now that you have a shortlist of companies, use these critical questions to evaluate each vendor against specific red and green flags.

By the end, you’ll determine which agency is the perfect partner for your business needs.

1. What pricing models do you offer?

🚩 Red flags:

• Forces you to sign a long-term contract without a termination clause
• Pushes you toward a rigid retainer (Belkins tip: Beware of one-size-fits-all packages)
• Refuses to add contingency plans for underperformance to contracts
• Hidden fees (e.g., extra costs for tools not mentioned during initial consultation)

✅ Green flags:

• Provides customizable plans based on market factors and unique needs (e.g., industry trends, a monthly lead and appointment quota your internal team can handle)
• Transparently outlines all costs and what’s (and who’s) included in every plan during initial consultation, including add-ons (e.g., ongoing inbound lead nurturing, paid advertising)
• Proposes a pilot project with deliverables and estimates clearly outlined 

📚 Further reading: B2B appointment setting costs and pricing models explained

2. How do you integrate into our sales and marketing teams?

🚩 Red flags:

• Operates channels and workflows in isolation
• Focuses solely on sales without integrating with your marketing efforts

✅ Green flags:

• Runs workshops to help marketing and sales define shared goals and metrics (e.g., MQL-to-SQL-to-closed deals ratio)
• Sets up weekly calls to review shared goals and metrics and monthly meetings to evaluate strategic directions
• Adapts approaches based on your organizational structure (e.g., at Belkins, if a client’s outbound function is owned by sales, we focus on marketing integration, like introducing social selling to attract quality leads.)
• Walks you through mapping the customer journey, establishing consistent messaging across channels and touchpoints, and implementing tracking that connects marketing activities to revenue

📚 Further reading: How to align sales and marketing teams: 4 principles

3. How experienced are your SDRs?

🚩 Red flags:

• Lack of feedback loop (i.e., no metrics review)
• Relies entirely on AI and templates
• Insufficient experience in lead research, communication, industry, and objection handling

✅ Green flags:

• Crafts laser-targeted messages for each prospect based on triggers or interactions
• Consistently conducts quality evaluations to improve call conversions
• Offers ongoing coaching to help SDRs refine their approaches
• Strategically matches your project with elite SDRs with proven expertise in your industry (e.g., Belkins handpicks SDRs based on industry knowledge, certifications, and success stories.)

📚 Further reading: In-house or outsourced SDRs: Which is right for your business?

4. What methodology do you use to ensure consistency?

🚩 Red flags:

• Obsessed with vanity metrics like volume
• Lack of a proven process for identifying bottlenecks in the funnel

✅ Green flags:

• Provides campaign insights and its impact on ROI
• Tracks metrics that impact revenue (e.g., appointment show-up rates, average deal value, conversion to sales)
• Explains its methodology for generating quality sales leads 

5. How do you qualify leads?

🚩 Red flags: 

• Only considers surface-level data (i.e., vague job titles, names, and phone numbers without truly understanding the buyer)
• Relies entirely on AI 

✅ Green flags:

• Focuses on leads based on ICP and buyer personas
• Accurately verifies all contacts’ details and vital data points through manual quality checks
• Sends you a list of qualified leads for approval before launching outreach campaigns

Which B2B (partial) sales outsourcing company have you picked?

Our handpicked third-party sales companies, along with the critical questions above, give you a promising start.

Add Belkins to your list if you’re seeking bespoke omnichannel strategies to reach your buyers today. Our agency is one of the top players in the space, as evidenced by the 100–400+ qualified appointments we deliver annually.