Managed outbound for B2B software, 34 people at one Chicago office, sends from client domains rather than its own
Agency service pages + Illinois business registry
Use cases
Find lead generation agencies and sales agency owners
This is for vendors selling into agencies, not for companies hiring one. Agencies are easy to find and hard to qualify: no database field carries partner tier, the stack they actually implement for clients, whether they run outbound themselves or only advise, or how many people they really employ. Search on those, and Causo reads the HubSpot Solutions Directory, Salesforce AppExchange consulting listings, Clutch and G2 profiles, Companies House and state registries and SDR job postings agency by agency, then shows you the evidence behind every match.
Run your first search93,903 marketing consulting establishments in the United States (NAICS 541613)
How to find sales and lead generation agencies by stack, vertical or partner tier
3 results for this search. Pick another above to see what it returns.
Outsourced SDR pods priced per booked meeting, 26 staff, no paid media practice at all
Pricing page + Clutch profile
48 staff across Chicago and Austin, work split between outbound execution and RevOps retainers
Careers page + G2 agency listing
Illustrative example. The source types are the ones Causo genuinely reads for this market.
Where the data on sales and lead generation agencies comes from
- HubSpot Solutions DirectoryPartner tier (Gold, Platinum, Diamond, Elite) and accreditations such as CRM Implementation and Data Migration
- Salesforce AppExchange consulting partner listingsWhich clouds a firm implements, the certifications it claims and the projects it publishes
- Clutch and G2 agency listingsService mix, minimum project size, client verticals and reviewed engagements
- Companies House, state Secretary of State registries, Irish CRO, HandelsregisterThe operating entity, directors, ownership changes and the employee number actually filed
- SEC EDGAR Form D filingsCapital raised by agency groups and roll-ups, and the holding company sitting above them
- Indeed, Greenhouse, Lever, WorkableSDR, BDR and RevOps openings, the clearest read on delivery capacity
- Apollo and Clay partner and agency directoriesWhich outbound tooling an agency resells, builds on or is certified in
- Glassdoor and the agencies’ own team and case study pagesHeadcount direction against the number the marketing copy implies
- Plus many moreNo fixed provider list. If the answer lives somewhere else, the agents read that instead.
Ask anything about a lead generation or outbound sales agency
Every result is a starting point, not an endpoint. Ask a follow-up about any agency on your list in plain English and the agents go back out and read for it, then answer with the sources they used.
Do they run outbound themselves, or only advise?
AnswerThey run it. The site sells managed SDR programmes priced per booked meeting, and two case studies show sequences their own team sent.
SourcesService and pricing pages + published case studies
What partner tier do they hold, and in which ecosystems?
AnswerPlatinum in the HubSpot Solutions Directory with the CRM Implementation accreditation, and a separate consulting listing on AppExchange for Sales Cloud.
SourcesVendor partner directories read at search time
How many people do they actually employ?
Answer19 employees on the latest filed accounts and 14 profiles on the team page, against a homepage that describes a team of 50.
SourcesFiled accounts + team page + job board history
Why you can’t filter lead generation agencies by partner tier or delivery model
93,903marketing consulting establishments in the United States (NAICS 541613)US Bureau of Labor Statistics, QCEW 2024 annual averages, NAICS 541613
49%of HubSpot’s 2025 revenue came from Solutions Partners and the customers they referredHubSpot Form 10-K for the year ended 31 December 2025, SEC EDGAR
10,653enterprises classified as call centres across the EU27 (NACE 82.20)Eurostat sbs_sc_ovw, NACE N82.20, EU27, 2022
These agencies are not hidden. Being findable is the product they sell, so they rank, they list themselves on Clutch and G2, they publish case studies and they post constantly, and every contact database already holds them. The problem starts one question later. Contact databases are assembled from firmographics and web signals: a headcount band, an industry label, a location, sometimes a detected technology. None of those fields tells you whether a firm sits at Gold, Platinum, Diamond or Elite tier in the HubSpot Solutions Directory, which clouds it is listed to implement on AppExchange, whether it sends outbound on a client’s behalf or only writes the playbook, which verticals it has actually delivered in, whether it is recruiting SDRs right now, or how many people it really employs rather than how many the homepage implies. Those facts are all published. They sit in the vendor partner directories, in Clutch and G2 profiles, in accounts filed at Companies House and the state business registries, and in the SDR and RevOps job postings that show whether there is capacity to deliver next quarter. They are just not fields, so no filter reaches them.
Figures as of August 2026.
Apollo vs ZoomInfo vs Causo for lead generation agency leads
| Apollo / ZoomInfo | Buying a list | Causo | |
|---|---|---|---|
| Filtering on HubSpot partner tier or accreditation | No such field | Not collected | Read from the HubSpot Solutions Directory |
| Telling outbound execution from RevOps advisory | Both sit under one industry label | Both sit under one industry label | Read from service pages, pricing and case studies |
| Real headcount versus the number the site implies | Profile-derived, and agencies inflate it | Whatever the compiler copied across | Checked against filed accounts and job boards |
| Whether they are hiring SDRs this month | Whenever the record was last refreshed | Date the list was compiled | Read at the moment you search |
Frequently asked questions.
Start from the directories agencies have to appear in rather than a contact database. The HubSpot Solutions Directory lists partner tier and accreditations, Salesforce publishes consulting partner listings on AppExchange, and Clutch and G2 carry service mix, minimum project size and reviewed engagements. Causo reads those alongside Companies House, the state business registries and SDR job postings, so a list can be built on partner tier, delivery model and hiring rather than on an industry label.
Because partner tier is not a field in those databases. Apollo and ZoomInfo are assembled from firmographics and web signals: headcount band, industry label, location and sometimes a detected technology. Tier is published by the software vendor instead. The HubSpot Solutions Directory shows whether a firm is Gold, Platinum, Diamond or Elite and which accreditations it holds, and Salesforce publishes consulting partner listings on AppExchange. Causo reads those directories directly, which is what turns tier into something searchable.
A lead generation agency runs outbound execution: it builds lists, writes sequences, sends on the client’s behalf and is usually paid per booked meeting or per month of delivery. A RevOps consultancy works on the system behind the selling: CRM implementation, routing, reporting, forecasting and process, usually on a project fee or retainer. Plenty of firms do both, and the label on the website rarely says which side the revenue comes from. Service pages, pricing pages and case studies do.
Read what it sells and what it hires for. An agency that runs outbound itself prices per booked meeting or per SDR seat, publishes case studies with its own sequences and reply rates, and advertises for SDRs and BDRs more or less continuously. An agency that advises prices by project, publishes strategy and implementation work, and hires consultants and solutions architects instead. Job boards are the single clearest tell, because delivery capacity has to be recruited before it can be sold.
Usually fewer than the website implies, because agency sites count contractors, offshore delivery partners and advisers inside phrases like a team of 50, while filed accounts count employees. In the United Kingdom and Ireland the average number of employees is stated in the accounts filed at Companies House and the Companies Registration Office. Elsewhere the check is the team page, the job board history and the professional network headcount read together. Causo puts those side by side so the gap is visible before you write the first email.
It is read at the moment you search rather than pulled from a stored snapshot, so an SDR role posted last week, or a partner tier that moved from Gold to Platinum last month, appears in this month’s results.
Yes. The partner directories are global already: the HubSpot Solutions Directory and the Salesforce AppExchange consulting listings cover every market. The registry layer changes by country, so Causo uses the local equivalent: Companies House in the United Kingdom, the Companies Registration Office in Ireland, the Handelsregister in Germany, the state Secretary of State registries and SEC EDGAR in the United States, and the ASIC company register in Australia.
One token per researched company, per decision maker found, per question asked and per outreach sequence sent. Plans start at $10 a month, and the first 10 tokens are free with no card required.