Free B2B lead sources in 2026: where to find leads at no cost, and where free stops

Free B2B lead sources that work are LinkedIn search, company websites and job pages, public company registers such as Companies House, events and communities where your buyers already gather, and your own customers' networks. They cost time instead of money. Free stops when you need verified contact details at volume, when freshness matters, or when the hours spent exceed the price of a database.

"Free" is a fair place to start. A founder with no budget can build a first list of 100 good prospects in a week, and doing it by hand teaches you who the buyer is. This post lists the legitimate free sources, what each one gives you, how to qualify what you find, and the honest point where free becomes the expensive option. Register facts come from the official pages named in each section, read on 25 October 2026.

Source 1: your own network and customers

The cheapest lead is someone who already knows you. List current customers, past customers, people who replied to you before, and colleagues' contacts. Ask each happy customer one question: "Who else has this problem?" A named introduction beats any list.

What you get: warm contacts with context. What it costs: nothing but the asking. The limit is size, because it does not scale past a few dozen names. If you use your LinkedIn connections, our post on exporting LinkedIn connections shows the official way to get the file.

Source 2: LinkedIn search

LinkedIn's free search filters by title, location, company and connection degree, and many of the people you want are on it. Boolean operators sharpen the results, which our post on LinkedIn Boolean search for prospecting covers. Build the search by hand, read the profiles, and note who fits.

What you get: names, titles, companies and a reason to write. What you do not get: a download. LinkedIn's User Agreement section 8.2 prohibits scraping or copying the Services with software, scripts or bots, so a free list from LinkedIn means copying by hand or using a tool you accept the risk of. Read our scraper alternatives post before you pick one.

Source 3: company websites and job pages

A company's own site tells you things a database does not. The team page names people. The careers page shows what they are investing in. The blog and the press page show what they care about this quarter. A hiring post for a role your product supports is a strong reason to write, and it is a signal you can act on today.

What you get: names, context and timing. What it costs: reading time for each company. Work from a target list of companies, not from the open web. Our guide to building a B2B lead list shows how to define the account list first.

Source 4: public registers

Official registers give you the facts about a company, not a way to reach it. They are good for building and checking an account list.

Companies House (UK). GOV.UK says you can get some details about a company for free, including company information such as the registered address and incorporation date, current and resigned officers, document images, mortgage charge data, previous names and insolvency information. You can also set up free email alerts for changes such as a new director or address. A new director can be a reason to write.

OpenCorporates. It describes itself as the world's largest open legal-entity database, with company records from over 140 government registries and other official sources. Its pricing page lists free at scale access for public benefit users such as investigative journalists, NGOs, universities and anti-crime research groups, and paid API plans from £2,250 a year for Essentials (up to 500 calls a month) when we read it. A normal business uses the public search for lookups, and the API is a paid product.

What you get: legal names, addresses, officers and dates. What you do not get: emails, phone numbers or any sign of buying intent. Treat registers as a way to verify and to find the name of a decision maker, then find the contact elsewhere.

Source 5: events and communities

People who attend a conference, join a Slack or Discord community, or answer in a forum have raised their hand on a topic. Conference speaker and sponsor pages are public lists of relevant companies. Community members who ask questions in your area tell you the problem in their own words.

What you get: self selected interest and language to borrow. The limit: join as a member, not as a pitch. In a community, helping first is the only approach that works, and unsolicited private messages to members get you removed. For LinkedIn events specifically, see our post on event attendees as leads.

How do you qualify what you find?

Free leads need the same checks as paid ones, and more of them.

Score a sample of 50 before you scale a source. Decide your cut off first, for example that most of the sample must pass fit and role, or the source is not worth the hours.

What does the law say about contacting free leads?

Finding a name for free does not make it free to use. The UK Information Commissioner's Office says its consent rule for electronic mail does not apply to corporate subscribers, but you must not hide who you are and must give a working way to opt out. Sole traders and some partnerships are treated like individuals. And UK GDPR still covers any details that identify a person, such as a named contact, even when they act in a business role, so you need a lawful basis and must give privacy information. Business contacts have an absolute right to object to direct marketing, and you must keep a suppression list. The ICO notes this guidance is under review. Other countries differ. This is not legal advice, so check the rules where your recipients are. Our outreach rules set out how Sellinger handles opt outs.

Where does free stop?

Free sources fail in four predictable places.

1. Contact details. Registers and websites rarely give a verified email or phone number. Guessing formats produces bounces, and bounces hurt the sender's reputation. Our post on lead enrichment explains how to fill the gaps.
2. Volume. Building by hand is slow, and a campaign that needs thousands of leads is a different job.
3. Freshness. A list you built in March is stale in October. People change roles.
4. Your time. If you earn more per hour than the cost of a contact, the free list is the expensive one.

Here is a made up comparison to show the shape of the decision. Say you value your time at 50 an hour, and you find 12 usable leads an hour by hand. Each usable lead then costs about 4 in time. If a database gives you a verified lead for less than that, buy it and spend your hours on the messages. Replace those numbers with your own before you decide. Our buying guide for B2B lead databases lists what to ask a vendor.

For scale, Sellinger's contact database has 700M+ contacts, and a free trial lasts 30 days on messaging modules and bundles with no card, so you can compare a free list against a searched one on the same campaign. Start with a small batch either way.

A weekly routine for a free pipeline

• Monday: pick 20 target companies from a register, a community or an event page.
• Tuesday: find the right role at each and note a specific reason to write.
• Wednesday: verify contact details and remove anyone who should not be contacted.
• Thursday and Friday: write and send, then log the replies and the source of each lead.
• Review monthly: which source produced replies, not just names. Drop the rest.