Best B2B Outbound Agencies in 2026, Reviewed and Ranked

Why trust this list, and the conflict I need to disclose

I'm Hlib Storchak. I build outbound systems for B2B founders and sales teams, and most of what follows comes from running this for clients, having booked 2000+ meetings for B2B clients along the way. I also need to say plainly, near the top, that I run outbound as a fractional and done-for-you operator, which makes me a direct competitor to every agency on this list. I'm not neutral in the sense of having no stake in the answer. What I can offer instead is an honest read: I have taken over accounts that came from several of these agencies, I have prospects who compared me against them before choosing, and I'd rather tell you where each one genuinely beats what I do than pretend otherwise.

The reason a list like this exists at all is that outsourcing sales development has become a real, growing category rather than a fallback. Grand View Research pegs the global sales and marketing business process outsourcing market at a path to USD 57.46 billion by 2030, growing at roughly a 9.4% CAGR. That is a lot of companies deciding, every year, that an outside team should run some or all of their outbound. This piece is for the founder or sales leader making that call in 2026, trying to figure out which name on the shortlist actually matches their situation.

How I ranked these eight

I ranked from broadest safe fit to most specialized, not from "best" to "worst." Belkins and CIENCE sit at the top because they serve the widest range of B2B company sizes and industries with the least risk of a poor fit if you know little else about your situation. Further down, Operatix, Cleverly, and Sopro are ranked lower only because they solve a narrower problem well, enterprise software SDR extension, LinkedIn specifically, and European buyers respectively, not because the work is worse. A narrow specialist can easily be the right call over a generalist once your situation matches its lane.

I only used what each agency's own site states about its model, positioning, and target segment, plus what shows up consistently across public reviews. I did not use, and would not trust, any specific dollar figure quoted by a rival agency's own "review" of a competitor, since those pages are themselves marketing content. Where cost comes up below, I describe the pricing model, not a number, and I tell you to check current pricing directly.

#1 Belkins

Verdict: the safest first call for most mid-market and enterprise B2B teams. Belkins positions itself as a full-service appointment-setting agency, running research, list building, cold email, and LinkedIn outreach as a managed program rather than a self-serve tool. It has built up one of the largest verified review footprints of any agency on this list on Clutch, which matters because it means you are not the first client testing whether the process works. The trade-off is that a large, well-known agency runs a defined playbook across many accounts, so a niche or unusual ICP may get less bespoke attention than a boutique operator would give it.

#2 CIENCE

Verdict: the pick if you want the data and the SDR team from one vendor. CIENCE differentiates by owning its own technology stack rather than reselling a stack of other vendors' tools, which its own materials lean on heavily as a reason campaigns can launch fast. It structures pricing around team size and the data services layered on top, so it suits a company that wants prospecting data, enrichment, and outreach execution bundled together instead of stitched from separate vendors. The trade-off is the same one every all-in-one brings: you are more locked into their stack's quality than you would be if you owned the data pipeline yourself.

#3 Martal Group

Verdict: the broadest reach across industries, if you need omnichannel and SQL-level qualification. Martal Group, based in Canada, positions itself around cross-industry coverage and multichannel outreach (email, LinkedIn, and calling together) with qualification carried through to a sales-qualified lead rather than a raw meeting. That is a genuinely useful distinction if your internal team is tired of chasing meetings that turn out to be unqualified. The trade-off is that broad cross-industry experience can mean less depth in any single vertical compared to an agency that only serves, say, enterprise SaaS.

#4 SalesRoads

Verdict: the clearest, most tightly scoped engagement structure. SalesRoads runs on a defined cycle model, a fixed block of weeks per engagement, which gives you a clean checkpoint to evaluate results before renewing rather than an open-ended monthly retainer that quietly continues. It is a US-based, premium done-for-you appointment-setting shop, which suits a buyer who wants predictable structure over flexibility. The trade-off is that a cycle-based commitment can feel less forgiving if your ICP or offer needs mid-cycle adjustment, since the scope was set before the cycle started.

#5 Callbox

Verdict: the deepest cold-calling heritage and the widest geographic reach. Callbox has been running B2B lead generation for over two decades and operates across multiple regions, which shows up in genuinely global coverage if your buyers are spread across North America, EMEA, and Asia-Pacific. That heritage in calling specifically is a real differentiator, since most newer agencies lean almost entirely on email and LinkedIn. The trade-off is that a large, long-running agency with global delivery can vary more in quality by region and account team than a smaller, more concentrated shop.

#6 Operatix

Verdict: built specifically for enterprise B2B software, not a generalist. Operatix positions itself squarely around accelerating outbound for B2B software companies, extending an existing enterprise sales team with SDR capacity based in the UK, US, and Singapore rather than replacing the sales motion outright. If you sell enterprise software with a defined enterprise sales team already in place, this specialization is exactly what you want. If you are an early-stage company without an enterprise sales motion to extend, it is the wrong tool, since the model assumes you already have a team for the SDRs to feed.

#7 Cleverly

Verdict: the cheapest, fastest way to test LinkedIn as a channel specifically. Cleverly's specialty is LinkedIn outreach at scale, with cold email offered as a secondary channel rather than the core product. It sits at a lower price point than most full-service agencies on this list, which makes it a reasonable low-commitment way to find out whether LinkedIn converts for your ICP before you invest in a bigger, multichannel program. The trade-off is obvious: if your buyers respond better to email or calling, a LinkedIn-first agency is not going to discover that for you.

#8 Sopro

Verdict: worth a look specifically if your buyers are mostly European. Sopro, a UK company, runs multichannel appointment setting with a positioning that leans toward European B2B buyers and the compliance context that comes with selling into the EU and UK. If most of your pipeline is North American, there are agencies on this list with a more direct track record there. If a meaningful share of your target accounts sit in Europe, Sopro's regional focus is a real advantage the US-heavy agencies above do not have.

Side by side

Retainer, pay-per-meeting, and cycle pricing: what each actually means

None of these agencies publish a single, stable number I would repeat here as fact, and I am not going to invent one. What I can do is walk through the three pricing shapes you will actually encounter and a simple way to compare them once you have real quotes in hand.

• Retainer. A fixed monthly fee, often with a setup cost. You are paying for the team's time and process regardless of exact output that month.
• Pay-per-meeting. You pay per qualified meeting booked, which shifts more risk to the agency but usually carries a higher per-meeting price to compensate.
• Cycle-based. A fixed block of weeks (commonly four) with a defined scope, giving you a natural renewal checkpoint instead of an open-ended monthly relationship.

Here is a simple way to compare them once you have quotes, using assumptions you should swap for your own numbers. Assume a retainer agency quotes $6,000 a month and books 8 meetings in that month: that is $750 per meeting. Assume a pay-per-meeting agency charges $450 per meeting and delivers the same 8: that is $3,600 that month, cheaper than the retainer at this volume. Run the same two models at 15 meetings a month and the retainer drops to $400 per meeting while the pay-per-meeting model stays flat at $450, so the retainer wins at higher volume. The crossover point depends entirely on the actual numbers you get quoted, but the exercise itself, plugging your own volume expectation into both formulas, is the useful part. Do not accept a single "our average client gets X meetings" line without asking what volume that average includes.

Red flags to check before you sign

A few checks apply across every agency on this list, and across any I did not include.

• Ask what happens to your list, sequences, and copy if you leave. If the answer is "nothing, it stays with us," you are renting results, not building an asset.
• Ask for a client reference in your specific industry and company size, not a general case study on their site.
• Ask exactly what counts as a qualified meeting in the contract. A vague definition is how a "meetings booked" report ends up full of no-shows and mismatched titles.
• Ask who is actually running your account day to day, and how many other accounts that person carries. A senior name on the sales call is not who ends up writing your emails.

Who each one actually fits, and when I'd be the wrong choice

Belkins, CIENCE, Martal Group, SalesRoads, and Callbox fit a company that wants a managed, hands-off program and is comfortable with a retainer or cycle commitment while it runs. Operatix fits specifically if you already have an enterprise sales team to feed. Cleverly fits a narrow LinkedIn test. Sopro fits a Europe-heavy pipeline. All eight fit a buyer who wants a proven process now more than they want to build internal capability.

I'd be the wrong choice if you want a large team running many channels at enterprise scale immediately, since I work as a lean, fractional operator, not a large delivery organization. I'd also be the wrong choice if you specifically want to hand off the work and never think about it again with zero interest in visibility, since my model is built around you keeping the ICP, the lists, and the playbook, which assumes you want at least some ongoing visibility into what is working. Where I'd suggest myself over any agency on this list is the opposite case: you want the speed of an agency, the ownership of an in-house team, and no long lock-in while you figure out if outbound is a motion worth scaling.

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