Key takeaways

  • Retargeting reaches people who've already had contact with you, the strongest buying signal there is.
  • Sales lead: €50 to €200 through retargeting versus €400 to €1,200 cold.
  • CPC €2 to €4 instead of €4 to €8, CTR ~1.5% instead of ~0.45%.
  • Minimum size 300, ideally 1,000. That takes roughly 1,000 website visitors a month.
  • GDPR advantage: in-app retargeting runs without cookies.

Retargeting means showing ads to people who've already had contact with you: through your website, a video, an ad, or a form. In B2B, with its long buying journey, this is the single most important lever you have. The audience is smaller, but its interest and trust are higher. That shows up directly in cost.

Why is retargeting the cheapest lever?

The math is clear-cut. A sales-qualified lead through retargeting often costs €50 to €200, versus €400 to €1,200 through a cold audience. Cost per click nearly halves, and click-through rate, at around 1.5 percent, runs roughly three times higher than the roughly 0.45 percent a cold audience delivers on average. The reason is simple: you're talking to people who already know you. Trust is partly built already, so the message lands with an audience that's actually listening.

From our accounts

A direct comparison makes the difference tangible: the same ad, the same message, run once against a cold audience and once against a warm one. Cold, it landed at 0.43 percent click-through rate and around €85 per content lead. In retargeting, 1.18 percent and around €40. Nearly triple the click-through rate, cost cut by more than half, purely because the context was different. That's exactly why retargeting isn't a nice-to-have, it's the lever that makes a campaign profitable.

The audiences, ranked by buying intent

Not every warm contact is equally warm. Rank your retargeting audiences by buying intent and treat them differently:

  • Website visitors: the strongest signal, and segmentable by page. Anyone who visited your pricing page is close to a decision and should get clear conversion ads. Anyone who was in your guide section still needs case studies and references.
  • Video viewers past 50 percent view and Company Page visitors: medium to high interest.
  • Ad engagers and Lead Gen Form interactions: someone who flipped through a Document Ad is still early in the journey. Webinar and demo contacts rank higher than plain guide downloads.
  • Contact and company lists from your CRM: not a recent touchpoint, but valuable for ABM.
The GDPR advantage

An often-overlooked benefit: only website visitors require cookie consent. Every other retargeting signal, meaning video views, Company Page visits, and interactions with your ads, happens directly inside LinkedIn, without third-party cookies. These audiences don't shrink because of cookie blockers. If you invest heavily in video and content, you build a stable retargeting audience that cookie deprecation simply doesn't touch.

The two-stage retargeting strategy

Retargeting works best in two phases. In the warm-up phase, you run Single Image and Video Ads against a cold audience (your core audience) that address pains and offer content. The goal: make the problem visible and filter out who's interested. In the retargeting phase, you then target exactly the people who reacted, with testimonials, case studies, demo videos, and Thought Leader Ads. The content depends on the time window: in the first 30 days it can be sales-oriented, after 90 days it should lean more toward guide-style content, because the acute need has cooled off.

Owning the feed: layering

A strong tactic for warm audiences: instead of one ad, run two or three ad groups with different ad formats against the same audience in parallel, say a Single Image ad in the feed, a Text Ad up top, and a Spotlight Ad in the right rail. When the contact logs in, they encounter you in several places at once. That reads as presence, not pestering, because the formats look different from each other. The best part: for a small warm audience of 2,000 to 3,000 people, around €10 a day is often enough. Retargeting is the rare case where a lot of impact costs very little.

Keeping ads fresh

Warm audiences can handle more exposure than cold ones, but even they wear out. The metric behind that is frequency: how often the same person sees your ad on average. With a small retargeting group running over several weeks, this number climbs fast, because the same people keep seeing the same handful of ads. At some point the effect flips: the ad becomes annoying or gets ignored, click-through rate drops, and the click gets more expensive. That's ad fatigue, the ad has simply worn out.

There's only one fix: enough different ads rotating through. As a rough guideline, plan one new creative for every week your retargeting window runs. For a 30-day audience, that's around five ads; for a 90-day window, correspondingly more. These don't need to be entirely new campaigns, just variants: a different angle, a different image, sometimes a testimonial, sometimes a case study, sometimes a short video.

Also set rotation to "Even ad rotation." Otherwise, LinkedIn's default setting, "Optimize for performance," keeps showing only the single ad with the best click-through rate, and that's exactly the one that wears out fastest. And anyone who converts should drop out of the audience, so you're not still advertising to someone who's already bought.

How to get started

The foundation is the Insight Tag, which takes about 15 minutes to install through Google Tag Manager. You need enough traffic, roughly 1,000 website visitors a month, and you should set up a separate audience per interaction type, letting each one build over one to six weeks. Use a fixed naming convention from day one, or after a few weeks you won't remember which audience is which. If an audience starts out too small to hit 300 people, combine several. And one strong extra lever: you can retarget expensive, high-intent Google Ads traffic cheaply on LinkedIn.