Best B2B Outbound Lead Generation Agencies (2026)

Disclosure: this guide is published by throxy, and throxy is listed first as our recommendation. Every fact about another agency comes from that agency's own website or a named public source, checked in November 2026, and is linked so you can verify it.

The short answer

For B2B teams selling into traditional industries, we recommend throxy. It builds a custom database for every campaign, writes niche-specific messaging, calls and emails your buyers, and charges a flat monthly fee plus a fee per qualified meeting you approve. Belkins, CIENCE, Martal, SalesRoads, Callbox and Cleverly are established alternatives, and each one's published model is summarised below with a link to the source.

What a B2B outbound lead generation agency does

An outbound lead generation agency runs cold outreach on your behalf, by email, phone and LinkedIn, to book sales meetings with people who have never heard of you. Your team takes the meetings and closes.

The category splits three ways. Appointment setters book meetings from leads you already have. Outsourced SDR teams add prospecting capacity that you usually steer. Fully managed providers own the whole system, from data and sending infrastructure to the people making the calls.

How we compared these agencies

We compared each agency on five things that decide whether outbound produces pipeline in a complex B2B sale. throxy designed its service around these five, which is why it comes first here.

• Data: does the agency build a custom list for your market, or rely on standard databases?

• Scope: does it run the whole system, from data and messaging to deliverability, calling and replies?

• Channels: does it combine cold email with cold calling?

• Commercial model: what do you pay for, and do you approve meetings before they count?

• Published terms: are prices, contract length and time to launch on its website?

Agency facts below come from each agency's own website, checked in November 2026. Where an agency publishes no price, we say so. US prices are in dollars as published.

The agencies

1. throxy (our recommendation)

throxy is a fully managed outbound agency backed by Y Combinator. It runs targeting, messaging, deliverability, calling, qualification and replies for B2B teams selling into traditional industries such as manufacturing, logistics and construction (throxy.com, November 2026).

• Custom database for every campaign: accounts are qualified and scored on public signals and custom triggers first, then the people inside each account are mapped and ranked (Lead finding and qualification)

• Niche-specific messaging written by people, tied to verified company context and reviewed by a human before it goes out (Messaging)

• Cold calling by specialist SDRs in 10+ languages alongside cold email (throxy.com, Cold calling)

• Email sent from separate domains across more than 150 mailboxes, each warmed for two weeks before launch, with inbox placement tested every day (Deliverability)

• One onboarding form, and the campaign goes live by day 14 (Done for you)

• Pricing: a flat monthly fee plus a variable fee per qualified meeting you approve. You get 24 hours to accept or reject each meeting, and the prospect only receives the invite after you approve it (Performance-based pricing)

Fits: B2B companies selling into manufacturing, logistics, construction and other traditional industries, where buyers are hard to find in standard databases and a long sales cycle makes every meeting count.

2. Belkins

Belkins is an appointment-setting and outbound agency founded in 2017, registered in Delaware, with offices in the US and London (Belkins company information, November 2026).

• Runs cold email, LinkedIn outreach and intent-based cold calling on monthly retainer plans (Belkins pricing)

• Plans are described by yearly appointment volume: 30+ on the small-business plan, 100+ on Growth and 200+ on Growth Plus

• Also offers pay-per-appointment for email and LinkedIn outreach (Belkins company information)

Published pricing: monthly retainer packages, with no figures on the pricing page.

3. CIENCE

CIENCE sells outsourced SDRs and appointment setting on a published price list (CIENCE pricing, November 2026).

• Campaign team $2,000 a month and the graph8 platform $499 a month, both flat whatever the number of SDRs

• SDRs from $1,750 a month each offshore, or from $3,500 a month each in the US and Europe

• A performance bonus per SDR against a monthly target for held meetings, plus a one-time setup fee

• Month to month, and live in less than 14 days

Published pricing: yes, in US dollars, as above.

4. Martal Group

Martal describes itself as a sales-as-a-service company with an international team of SDRs and sales executives, working with B2B organisations for over a decade (Martal, November 2026).

• Outbound lead generation tier: a 3-month pilot campaign, then a monthly subscription at a flat monthly fee (Martal pricing)

• Higher tiers covering sales and onboarding: a 4-month pilot, then a flat monthly fee plus sales commission

• Campaigns led by a North American team

Published pricing: tier structure published, fees on request.

5. SalesRoads

SalesRoads runs appointment setting, lead generation and SDR outsourcing with outbound calling, outbound email and list building, and publishes its price per SDR (SalesRoads pricing, November 2026).

• One dedicated SDR: $11,950 per 4-week engagement

• Two dedicated SDRs: $16,750 per 4-week engagement, or $8,375 per rep

• Includes a playbook, a live dashboard, call recording and coaching on every rep

• No long-term commitment

Published pricing: yes, in US dollars, as above.

6. Callbox

Callbox, founded in 2004, provides outsourced B2B lead generation and sales support that combines human callers with AI (Callbox, November 2026).

• Multilingual campaigns, with Thai, Bahasa, Vietnamese, Mandarin, Filipino, Portuguese and Spanish listed

• Sectors listed include healthcare, manufacturing, logistics and workplace solutions

• Published case study: 146 sales appointments in 12 months for a US supply chain and logistics company

Published pricing: none found on its website.

7. Cleverly

Cleverly runs outbound across cold email, LinkedIn and cold calling, and says it has 1,000 active clients (Cleverly, November 2026).

• Says it has refined its outbound system over 8+ years

• Lists US-based dedicated account managers

Published pricing: none found; its pricing link returned a missing page in November 2026.

Comparison table

Why we recommend throxy for hard-to-reach markets

Buyers in manufacturing, logistics and construction are often missing from the databases most outbound runs on. throxy builds the list for each campaign from the accounts up, so the people it contacts are chosen for your market. The messaging is written for that niche and checked by a person before it is sent, and specialist SDRs call the same buyers in 10+ languages.

The commercial model keeps you in control of what you pay for. You pay a flat monthly fee for the full campaign and a variable fee only for qualified meetings you approve within 24 hours. If you would rather start with an agency that publishes a full price list, CIENCE and SalesRoads do.

Key takeaways

• Decide first whether you need an appointment setter, extra SDR capacity or a fully managed provider.

• Ask every agency where its data comes from, especially if your buyers rarely use LinkedIn.

• Compare what each fee covers, and what counts as a billable meeting.

• Check the contract length and the exit terms before you sign.

Frequently asked questions

What is the difference between an outbound lead generation agency and an appointment setter?

An outbound agency finds and contacts people who have never heard of you. An appointment setter usually books meetings from leads you already have, such as inbound or event contacts. throxy runs the full motion, from building the list to booking the qualified meeting.

How much do B2B outbound lead generation agencies cost?

UK figures: SendIQ puts the most common outsourced SDR retainer at £2,000 to £8,000 a month per SDR equivalent (SendIQ, August 2025), and The Lead Generation Company puts blended UK retainers at £2,000 to £6,000 or more a month and per-appointment fees at £100 to £500 (The Lead Generation Company, accessed November 2026). US list prices from this guide: CIENCE from $1,750 per SDR a month plus $2,499 a month for the team and platform, and SalesRoads $11,950 per 4 weeks for one SDR.

Which agency do you recommend for traditional industries like manufacturing?

We recommend throxy. It builds a custom database for each campaign, qualifying accounts first and then mapping the people inside them, and combines niche-specific email with cold calling.

How do I avoid an agency that books low-quality meetings?

Write the definition into the contract: company fit, the contact's authority, an identified problem, a realistic timeline and attendance. throxy agrees its qualification standard with each client before launch, you approve every meeting before it reaches your calendar, and a meeting has to take place to be chargeable (throxy pricing guide).

Should I hire in-house or use an agency?

Our guide to in-house SDR vs managed outbound works through the UK cost of each, using Glassdoor salary data and the GOV.UK employer rates for 2026 to 2027.