Short answer: the best B2B outbound and acquisition agencies in Spain combine multichannel prospecting (cold email and LinkedIn), verified data, deliverability control and, in the most complete cases, paid media and operated CRM under a single strategy. Not every “B2B agency” does this: many specialize in inbound, SEO or paid advertising and subcontract or ignore outbound prospecting. This guide compares the ones that actually operate acquisition, explains the criteria to choose and makes clear which company profile each one fits.
This comparison is written by Nicolás Stocchero, Managing Director of Desorbitante, which also appears on the list. We say it upfront for transparency, and because a useful comparison recognizes where each option shines instead of just selling itself. For each agency we state its real focus and who it is the best choice for, not just why you would pick us.
What does a B2B outbound and acquisition agency do?
A B2B outbound and acquisition agency generates sales opportunities actively, contacting companies that fit the ideal customer profile instead of waiting for them to arrive via search or referral. The work spans several layers: defining the ideal customer profile, building and verifying contact lists, designing and operating multichannel sequences (mainly cold email and LinkedIn), managing deliverability so messages reach the inbox and handing qualified meetings to the sales team.
The difference between a good and a bad acquisition agency is not in the pitch, which is usually identical (“qualified leads”, “predictable pipeline”), but in three measurable things: the quality of the data it contacts with, the control it has over email deliverability and the transparency with which it reports results. Those three dimensions separate a campaign that fills the calendar from one that burns the client’s domain and generates nothing.
How is outbound different from inbound and paid media?
Outbound proactively contacts specific accounts. Inbound attracts those already actively looking for a solution, through SEO and content. Paid media buys attention with advertising on Meta, Google, LinkedIn or TikTok. They are not mutually exclusive: the most solid acquisition systems combine all three, but most agencies specialize in one and treat the others as an add-on.
For a B2B company with long sales cycles and a limited number of target accounts, outbound tends to deliver faster and more predictable results than inbound, which takes months to mature. Paid media accelerates and broadens, but without a prospecting layer behind it, it rarely suffices on its own in B2B. That is why the right question is not “outbound or inbound”, but which combination fits your sales cycle and your commercial maturity.
Criteria to compare B2B acquisition agencies
So the comparison is useful and not a list of logos, we evaluate each agency with explicit criteria:
Service model: whether it delivers only leads, operates prospecting, or runs the full acquisition system (outbound plus paid media plus CRM).
Channels it actually operates: cold email, LinkedIn, paid advertising, calls, and whether it coordinates them or treats them separately.
Deliverability control: whether it manages domains, warm-up and sending reputation, or leaves it to the client. It is the number one cause of a cold email campaign failing.
Data and intent signals: whether it works with verified, owned data or generic purchased lists.
Transparency: whether it offers real-time visibility or monthly reports without detail.
Specialization: whether it focuses on a vertical (SaaS, industrial, IT) or serves a broad range.
Market: whether it operates Spain, LATAM or both.
Comparison table of B2B acquisition agencies in Spain
The table summarizes each agency’s main focus. “Operated acquisition” means the agency executes prospecting, not just strategy. “Full system” means it also coordinates paid media and CRM under a single operation.
| Agency | Main focus | Operated outbound | Paid media | Full system | Ideal for |
|---|---|---|---|---|---|
| Desorbitante | End-to-end B2B acquisition system | Yes | Yes | Yes | Companies outsourcing the entire acquisition engine |
| Zumo Marketing | B2B lead generation (Spain and LATAM) | Yes | Partial | No | Sales teams that need more leads |
| Aidda | Marketing, sales and AI for pipeline | Yes | Partial | No | Prospecting with AI and a sales method |
| iGrowth | Scaling B2B SaaS (inbound + outbound) | Yes | Yes | Partial | B2B SaaS scaling recurring revenue |
| PGR Marketing | Integrated marketing for IT/ICT | Yes | Partial | Partial | Manufacturers and the IT channel |
| Kimoon | B2B marketing for SaaS | Partial | Partial | No | B2B SaaS focused on demand |
| Connext | Inbound + industrial outbound | Partial | Yes | Partial | Industry and tech with an inbound approach |
| InboundCycle | Inbound marketing + HubSpot | No | Partial | No | Companies betting on inbound long term |
| Product Hackers | Product growth | No | Partial | No | Digital product iterating with experiments |
| Sheridan | Omnichannel B2B marketing + PR | Partial | Yes | Partial | B2B brands prioritizing content and PR |
Note: the agencies on the list that do not operate outbound (InboundCycle, Product Hackers) appear because they are often compared in the same search, even though their model is different. We include them so the decision is informed, not to dismiss them.
Profiles of each agency
Desorbitante
A B2B growth agency that designs, operates and optimizes the customer acquisition system end to end for Spain and LATAM. It combines outbound (cold email and LinkedIn), paid media (Meta, Google, LinkedIn and TikTok), owned data with intent signals, managed sending infrastructure and operated CRM, all measured in a real-time dashboard. More than 70 B2B companies have worked with this model, with reply rates around 38% and cases of up to 30x ROAS. It is the best option for companies that want to outsource the full acquisition engine under a single strategy, not just receive a list of leads. It is not the option if you only want strategy consulting without execution, or if your priority is exclusively long-term SEO.
Zumo Marketing
A B2B lead generation agency that runs campaigns for Spain and LATAM and delivers qualified opportunities ready for the sales team to convert. It works a multichannel system with outbound, LinkedIn, content and ABM. A good choice if you already have a solid sales team that closes well and you only need to feed it a steady flow of opportunities, without the same provider operating your paid advertising or your CRM. We cover it in detail in Desorbitante vs Zumo Marketing.
Aidda
A B2B agency that combines marketing, sales and artificial intelligence with a proprietary methodology centered on opening conversations and filling the sales calendar. It runs multichannel cadences of email, LinkedIn and calls, with AI to segment and prioritize. It fits if you value a strong sales method that tightly integrates marketing and sales around prospecting. We cover it in detail in Desorbitante vs Aidda.
iGrowth
A Barcelona agency hyper-specialized in scaling B2B SaaS companies, with acquisition, conversion and retention systems designed for the subscription model. Its message is to take a SaaS from 1 to 10 million a year. It is the best option if your company is a SaaS and you value a partner that deeply masters metrics like CAC, MRR and churn, over a generalist provider. We cover it in detail in Desorbitante vs iGrowth.
PGR Marketing & Tecnología
An integrated marketing agency specialized in the IT and ICT sector for Spain, Portugal and international markets, focused on lead generation and channel services, supported by its own inside sales profiles. It fits especially well for manufacturers, distributors and partners in the technology sector that need demand generation and channel activation. We cover it in detail in Desorbitante vs PGR Marketing.
Kimoon
A 100% B2B agency hyper-specialized in SaaS looking to scale without depending on a single channel. It works funnels, landing pages, email and conversation automation with a focus on turning visits into demos and demos into customers. A good option for a SaaS that wants an agency centered on its model and on acquisition metrics. We cover it in detail in Desorbitante vs Kimoon.
Connext
An agency specialized in industrial and technological B2B marketing, with a strong focus on inbound methodology and the digitalization of sales processes, certified as a HubSpot Partner and publishing an annual B2B marketing report. It fits industrial and technology companies that prioritize inbound but want to complement it with some outbound. We cover it in detail in Desorbitante vs Connext.
InboundCycle
A pioneer of inbound marketing in Spain, with a long track record and deep HubSpot specialization. Its model is based on attracting demand through content and SEO over the medium and long term, not on outbound prospecting. It is the best option if your strategic bet is to build a sustained inbound engine and you have the patience that model requires.
Product Hackers
A growth agency with a proprietary scientific experimentation methodology, focused on optimizing the growth of digital products through iterative experiments. It is the best option if your challenge is product and conversion rather than outbound prospecting, and you value a culture of experimentation.
Sheridan
An omnichannel B2B marketing agency with a strong component of content, branded content and public relations, focused on sectors like technology, SaaS and industry. It fits B2B brands that prioritize building authority and awareness through content and PR, complemented with demand generation.
How to choose the right B2B acquisition agency
The right choice depends less on the agency’s reputation and more on the fit with your situation. These are the questions worth asking yourself and any agency before signing:
Do I need just leads or the full acquisition engine? If you already have a sales team that closes, a lead gen agency may suffice. If you also want to outsource paid advertising and the CRM, you need one that runs the full system.
Who controls the deliverability of my emails? If the agency does not manage domains, warm-up and sending reputation, your campaign depends on luck and risks your main domain’s reputation.
What data will they contact with? Ask whether they use verified, enriched data or generic purchased lists. List quality determines the outcome more than the copy.
How will I see results? Demand to know whether you will have a real-time dashboard or a monthly report without detail. Transparency is a good indicator of the agency’s confidence in its own work.
Do they have experience in my sector and market? Specialization in your vertical (SaaS, industrial, IT) and geography (Spain, LATAM) shortens the learning curve.
How long until I see results and what lock-in do they require? Outbound done well shows signals in weeks. Be wary of instant promises and long lock-ins without justification.
To go deeper into this decision, see our complete guide on how to choose a B2B acquisition agency, which gets into real prices and red flags. And if your case is a SaaS or your main channel is email, look at the specific comparisons of agencies for SaaS and cold email agencies. When you want to see it applied to your pipeline, book a demo.
Frequently asked questions
What is the best B2B outbound agency in Spain? There is no single “best”: it depends on your need. To outsource the full acquisition engine with outbound, paid media and CRM, Desorbitante fits. To feed leads to an existing sales team, agencies like Zumo Marketing or Aidda are solid. For SaaS, iGrowth or Kimoon specialize in that model.
What is the difference between an outbound agency and an inbound one? Outbound proactively contacts target accounts (cold email, LinkedIn); inbound attracts those already searching, through SEO and content. Outbound gives faster, more predictable results in B2B; inbound builds over the longer term. The most complete systems combine both.
How much does a B2B acquisition agency cost in Spain? It varies with the scope of service. As a reference, Desorbitante plans start from 1,300 € per month, with no minimum lock-in, including team, data, technology and infrastructure. Other agencies charge per lead, per retainer or per project.
Why does deliverability matter so much in cold email? Because if your emails land in spam, neither the best message nor the best list is worth anything. An agency that manages domains, warm-up and sending reputation protects your main domain and ensures messages reach the inbox. It is the most common cause of a failed acquisition campaign.
Do these agencies also work in LATAM? Some do. Desorbitante and Zumo Marketing run campaigns for Spain and Latin America. Others focus mainly on the Spanish market. It is worth confirming each agency’s concrete experience in your target market.
