Companies Using Microsoft Advertising

The small-business advertising page

Every other profile in this batch describes an enterprise platform bought through procurement. Microsoft Advertising is the opposite, and the numbers make the contrast stark. Companies with fewer than 50 employees are 75.22% of its matched customer base. Organisations above 1,000 employees are 3.21%. Companies founded in the 2010s are the largest age group at 36.25%, and nearly half of the base was founded after 2010.

The cause is the pricing model rather than the product. The Universal Event Tracking tag is free to install and requires no contract, so nothing filters out the small end of the market the way a licence fee does. What we are measuring is the population of businesses willing to try paid search beyond Google, and that population is overwhelmingly small, young, and local.

Three quarters of Microsoft Advertising deployments belong to companies with fewer than 50 staff. A free tag has no buying threshold, so the distribution shows the whole market rather than its enterprise tier.

What a tag actually proves

A conversion pixel is a weaker signal of spend than a licensed platform is of usage, and the distinction matters for anyone using this list commercially. The UET tag is installed once, usually through a tag manager, and it keeps loading whether or not a campaign is currently running. A detection tells you an organisation has set up Microsoft Advertising conversion tracking at some point. It does not tell you they are spending today.

The co-occurrence data shows how the tag arrives. Google Tag Manager appears on 94.70% of these domains, the highest rate we measure for any technology pair of this size, and Google Analytics on 92.54%. Adding a UET tag through an existing tag manager is close to frictionless, which both explains the breadth of deployment and weakens what any individual detection implies.

Bing advertisers are Meta advertisers

Facebook Pixel appears on 64.46% of Microsoft Advertising domains. That is the most commercially useful row in the stack, because it identifies the shape of the buyer: a multi-channel small advertiser running search and social together, not a Bing specialist.

It also explains why the competitive framing usually applied to this category is wrong. Advertisers do not choose between Microsoft Advertising and Twitter Ads or Criteo. They add channels. Our own category shares reflect that, since they overlap heavily and cannot be read as a division of advertising spend.

Why this page publishes no switching data

We can measure which domains dropped the UET tag, and 108,793 have done so since tracking began in March 2026. It would be straightforward to pair that against rival pixels and publish a switching table, and several thousand rows would appear. We tested whether those rows mean anything, and they do not.

Among domains that still run Microsoft Advertising, 15.17% also carry the Twitter Ads pixel. Among domains that dropped Microsoft Advertising, only 2.59% carry it. If advertisers were migrating, the destination would be over-represented among leavers. It is roughly six times under-represented instead, which is the signature of advertisers stopping activity altogether rather than moving it. Sites that drop one pixel tend to drop the others too.

Domains that dropped the UET tag are six times less likely to run a rival pixel than domains that kept it. That is advertiser attrition, not migration, so we publish no switching table.

Geography follows search share

The United States accounts for 52.60% of matched companies and the United Kingdom for 9.83%, a share well above what the UK's size would predict. Canada, Australia and the Netherlands follow. This distribution tracks Bing's own search share, which is concentrated in English-speaking markets and on Windows desktop defaults, more closely than it tracks general internet commerce.

For anyone segmenting this list, that is the practical filter. Microsoft Advertising reach is a function of where Bing has meaningful query volume, and outside those markets the tag is present in far smaller numbers regardless of business size or sector. TechnologyChecker.io publishes 344,173 as the count of domains carrying the tag, which is a floor on installations and a loose upper bound on active advertisers.