What is retargeting?
Retargeting is the practice of showing ads to people who already visited your website or engaged with your brand, found again either through a browser pixel on the ad platform or through an uploaded list of known contacts.
A retargeting audience is only as good as the crowd that produced it, and a B2B website draws a mixed one. Evaluators visit, but so do students, competitors, job applicants, partners, and customers looking for the login page. A pixel records each of them as a browser, and the ad platform serves ads to that browser later. It has no field for company fit or reason for the visit, so a default campaign pays to follow everyone around. Retargeting earns its place when the pool is narrowed before spend begins, for example to visitors of a pricing page(opens in a new tab) who can be tied to a target account(opens in a new tab).
How pixel-based and list-based retargeting work
Pixel-based retargeting starts with a tag on your site: the Meta pixel, the LinkedIn Insight Tag, or Google's remarketing tag. When a visitor loads a page, the tag adds that browser to an audience, and the platform serves your ads to that browser as it moves through feeds, search, and video. You define the audience by page rules, such as everyone who viewed a product page in the last 30 days. Google's remarketing lists default to 30 days of membership.
List-based retargeting starts from records you already hold. You upload a contact or account list from your CRM, the platform matches it to its own users, and ads run against whoever matched. A list can reach people who never visited your site, such as contacts from a closed-lost deal or attendees of an event. The upload-and-match step is the same one any custom audience goes through, so the share of your records the platform can match sets the size of the pool.
What browsers do to the pixel
Pixel retargeting relies on a third-party cookie or a similar browser identifier, and browsers treat those differently. Safari blocks third-party cookies by default and allows access only through its Storage Access API. Chrome still supports them. Google dropped its plan for a standalone cookie prompt in April 2025 and kept the existing controls. The audience a pixel builds therefore depends on which browsers your visitors use, and a team with many Safari visitors sees a smaller pool than the site analytics suggest. Retargeting that survives these changes leans on a first-party identifier or a consented list.
Platform thresholds shape small B2B audiences
B2B audiences are small, and every platform sets minimums. Google Ads requires 100 active users in 30 days before a remarketing list can serve on Display, Search, or YouTube, and says a new audience takes 48 to 72 hours to populate. LinkedIn website retargeting requires the Insight Tag, and its matched audiences are restricted in the European Economic Area and Switzerland unless members opt in. A narrowly defined audience, such as visitors from a short list of target accounts, can fall under a minimum and never deliver. Teams then widen the rule until the audience serves, which brings the students and job seekers back in.
Account-level versus contact-level retargeting
Account-level retargeting aims ads at a company. An uploaded account list, or the company a visit resolves to, becomes the audience, and the ads reach employees of those companies. That fits a program that wants coverage across a target account list, with the cost that anyone at the company can see the ad, including people with no say in the purchase.
Contact-level retargeting aims ads at the specific people who showed interest. The audience is a list of named individuals, built from identified visitors(opens in a new tab) and other first-party activity, and matched to their ad profiles. The person who read your pricing page is often not the person who signs the contract, so naming the first makes it possible to reach the rest of the buying committee with messages that fit their roles. The cost is a smaller audience, and each name needs an identity you trust before it goes into an upload.
Retargeting versus remarketing
Many marketers use the two words for the same thing. Google Ads calls its paid feature remarketing, while most vendors and agencies call the same ad practice retargeting. A common convention reserves remarketing for email to past contacts and retargeting for paid ads, and teams that follow it should say so in briefs. Check which meaning a document or vendor uses before comparing results.
Where retargeting fits in an ABM program
Inside an ABM program, retargeting is an activation channel. Account selection, scoring, and anonymous visitor(opens in a new tab) identification decide who belongs in the audience, and retargeting keeps your message in front of them between sales touches. It works best as part of an always-on presence at priority accounts, as described in always-on audiences(opens in a new tab), with the creative shifting as accounts move toward a buying decision.