B2B remarketing shows ads to people who already visited your site or engaged with your ads, so that a buyer who left the pricing page last Tuesday sees you again while the decision is still open. Done well, it keeps you on the shortlist. Done badly, it follows a job applicant around the internet for three months with a demo offer.
Most of the badly run version comes from copying retail habits into a market that works differently. This guide covers what changes in B2B, how to set up audiences before you need them, how long to keep people in them, which segments deserve which message, and how to stop before you become the ad people complain about.
Why B2B remarketing is not retail retargeting
A shoe shop can chase every visitor for a week with the pair they looked at. The visitor is the buyer, the decision takes days, and there is enough traffic to fill any audience. None of that holds in B2B.
Your audiences are small. A niche software company gets modest traffic, and a big share of it is students, competitors, job seekers and existing customers looking for the login page.
The person who visited is often not the person who signs. A security analyst reads your comparison page, then three other people at the same company make the call. And the decision can take months, so an ad that runs hard for two weeks and then stops misses the part of the cycle where it would have helped.
That changes the goal. Retail retargeting tries to finish a purchase. B2B remarketing tries to keep the right accounts familiar with you, with the right message for where they are, for as long as the deal is realistically open.
Build the audiences months before the campaign
This is the step teams skip, and it costs them the first month of every campaign.
LinkedIn’s help center says a new website audience “starts building on the day you create it”, and gives the example that an audience set to 30 days “won’t include website events from the 30 days before you created it.” If you add the LinkedIn Insight Tag the week the campaign launches, you start with nothing.
Both platforms also need a minimum audience before an ad will run:
- Google Ads: Google’s help center says your segment needs a minimum audience size of 100 active visitors or users within the last 30 days before your ads show on the Display Network, on Search or on YouTube.
- LinkedIn: LinkedIn says a website audience must match at least 300 member accounts before it becomes active, and 300 member accounts is also the minimum audience for an ad set.
For a small B2B site, that bar is real. A segment built only from visitors to one pricing page may never reach it. So put the tags on the whole site now, create the audiences you think you will want in six months, and let them fill while you work on everything else.
LinkedIn can also build audiences from people who engaged on LinkedIn itself: people who viewed your video ads, engaged with a document ad, opened or submitted a Lead Gen Form, engaged with your Company Page, or responded to your LinkedIn Event. Those audiences often grow faster than a website audience, because they come from ad spend you are already making. If you run LinkedIn document ads, everyone who engaged with one is a remarketing audience you already paid to build.
One caution for European campaigns. LinkedIn notes that the size of Matched Audiences may be limited within the European Economic Area and Switzerland, so check the audience size for a European campaign before you plan the budget around it.
Match the window to your sales cycle
How long should someone stay in a remarketing audience? Google’s own help center answers it plainly: “In general, the membership duration should be similar to the length of your sales cycle.”
That sounds obvious, and most B2B accounts still run the defaults. A 30-day window on a product that takes six months to buy means you stop talking to the account right when a second or third person on the buying committee starts researching.
The platforms give you different ceilings. In Google Ads, a website segment can hold people for up to 540 days. On LinkedIn, a website audience built from Website Actions offers lookback windows of 30, 60, 90 or 180 days, and a video audience goes back as far as 365 days.
Data table
| Audience type | Days |
|---|---|
| LinkedIn Website Actions audience | 180 |
| LinkedIn video audience | 365 |
| Google Ads website segment | 540 |
So the longest possible window is not the same everywhere. If your cycle runs longer than 180 days, a LinkedIn Website Actions audience cannot look back across all of it, so keep a longer window in Google Ads or on a LinkedIn video audience as a second net.
Do not simply max out every window, either. A long window is right for a pricing page visitor. It is wrong for someone who read one blog post a year ago. Their interest has probably moved on, and paying to reach them dilutes the audience that matters.
Segment by what the visit tells you
“Everyone who visited the site” is the weakest remarketing audience you can build. A visit to the careers page and a visit to the pricing page are not the same signal, and they should never see the same ad.
Start with a handful of segments based on what the person did, then give each one a message that fits:
| What they did | What it usually means | What to show them |
|---|---|---|
| Visited pricing, demo or contact pages and did not convert | Active evaluation, often close to a shortlist | Proof: a customer story, a short product walkthrough, a direct invitation to talk |
| Read comparison pages or case studies | Comparing options, building a case internally | Material they can forward: a buyer’s guide, a comparison sheet, an ROI explainer |
| Opened a LinkedIn Lead Gen Form and did not submit | Interested, not ready to hand over details | A lighter offer than the one they walked away from |
| Watched most of a video ad | Engaged with the problem, not yet with you | The next piece of the story, not a sales pitch |
| Read one or two blog posts | Early research, or no buying intent at all | Useful content, short window, low budget |
LinkedIn lets you split video audiences by how much of the video people watched, at 25%, 50%, 75% or 97%. Someone who watched nearly all of a two-minute video has told you more than someone who scrolled past it after three seconds, so build the audience from the higher thresholds.
Order matters too. Show proof and specifics to the people near a decision. Keep education for people who are still early. A buyer who has already read your pricing page does not need another awareness ad about why the category exists.
How to stay welcome: exclusions, rotation and a stopping point
Almost every complaint about remarketing comes down to three mistakes: showing ads to the wrong people, showing the same ad too often, and never stopping.
Exclude people who should not be there. Google’s help center describes the choice directly: you can re-engage visitors with follow-up ads, “or exclude them from future ads to focus solely on new leads.” Use exclusions for:
- current customers, for example everyone who visits your login or support pages
- people already in an open deal, so sales is not competing with its own ads
- anyone who already booked a meeting or submitted the form the ad is asking for
- careers page visitors, who came for a job, not a product
Rotate the creative. The same ad seen for the twentieth time stops being a reminder and starts being noise. Plan a sequence: two or three messages per segment, changed as the time since the visit grows. The first week can be a direct invitation. After a month, a customer story works better than repeating the same offer.
Decide when to stop. Every segment needs an end. When the window closes, when the account converts, or when sales marks the deal as lost, the person should leave the audience. An ad that keeps running after a buyer chose someone else is the one they remember, for the wrong reason.
Measure it on pipeline, not view-through conversions
Remarketing reports look good. That is part of the problem. The people in the audience already knew you, so many of them would have come back anyway, and a conversion that happened after someone merely saw an ad is weak evidence that the ad caused it.
Judge the program on the things sales can confirm:
- meetings booked by people or accounts that were in a remarketing audience
- open opportunities where the account saw remarketing ads during the deal
- how long deals took, compared with similar accounts that were not remarketed to
If you can, hold a small share of the audience out of the campaign for a period and compare the two groups. It is the plainest way to see how much the ads add on top of what those buyers would have done without them. For how remarketing fits alongside the rest of a demo-focused plan, see our guide on how to book more demos, and if you would rather have a team build and run the program, our B2B retargeting services cover it end to end.
FAQ: B2B remarketing
What is B2B remarketing?
It is advertising to people who already visited your website or engaged with your ads, so that buyers who are still deciding see you again. In B2B it works best with small, intent-based segments and messages that match where each buyer is.
Is remarketing the same as retargeting?
In practice, yes. Marketers use the two words interchangeably, and both mean showing ads to people who already visited your site or engaged with your ads.
How big does a B2B remarketing audience need to be?
Google’s help center sets the same minimum audience size for the Display Network, Search and YouTube: 100 active visitors or users within the last 30 days. On LinkedIn, a website audience must match at least 300 member accounts before it becomes active, and the minimum audience for an ad set is also 300 member accounts.
How long should people stay in a remarketing audience?
Roughly as long as your sales cycle, which is also what Google’s help center advises. Keep long windows for high-intent visitors such as pricing page visits, and short ones for casual blog readers.
Why is my new LinkedIn retargeting audience empty?
LinkedIn says a new website audience starts building on the day you create it and grows as new website events happen. The audience also has to match at least 300 member accounts before it becomes active, which takes time on a smaller site.
Who should be excluded from B2B remarketing?
Current customers, people in open deals, anyone who already converted on the offer in the ad, and careers page visitors. Excluding them saves budget and keeps the ads away from people who will find them irritating.
How do you measure whether B2B remarketing works?
Look at meetings and opportunities from accounts that were in the audience, rather than view-through conversions. Holding back a small part of the audience as a comparison group shows how much the ads actually added.
COSEOM Team
COSEOM is a multilingual B2B growth agency. Since 2008 the COSEOM team has run international SEO, generative engine optimization, paid media and demand generation programs for B2B software and technology companies across their target markets. We publish our research, playbooks and product guides here. More about COSEOM
