FEBE Growth 100: 100% of ecom brands have broken conversion tracking

Last month, the 2026 FEBE Growth 100 list was revealed - highlighting the UK’s fastest-growing founder-led consumer brands.

Every business that made the list showcased genuine commercial momentum: strong revenue growth, real customer demand, and enough traction to stand out in an increasingly crowded market.

But that's not all. Every single ecommerce brand on the list also had broken conversion tracking on the platforms measuring and funding that growth. 

We audited them - and this is what we found.

The audit

Of the 100 businesses on the FEBE Growth 100 list, 54 have a traditional ecommerce funnel (homepage → product page → add to cart → checkout) that could be tested in full.

We ran each one through an automated audit of its shopping journey to check whether the right conversion events reach Meta, Google Ads and GA4, and whether they carry the data those platforms need to use them.

All 54 of the 54 (100%) have at least one broken conversion tracking issue on Meta, Google Ads or GA4.

That's not 54 sites with a random missing pixel somewhere. 

It's 54 sites where a platform they rely on to run and measure their digital marketing performance is either blind to part of the funnel, double-counting it, or feeding it consent signals it shouldn't trust.

Brands on the list span food & bev, skincare, supplements, homeware, and fashion, so this isn't a small-account or single-category problem. It's universal.

(Note: this audit is based on a single desktop browser session from a UK IP address, run in July 2026. It excluded sites with a signup- or account-gated journey, as we couldn't reach the standard funnel steps needed to check event coverage and accuracy.)

What is broken conversion tracking?

For the purposes of this audit, a store is classified as having broken conversion tracking if at least one primary tracking issue is present on at least one platform it actively uses across Meta, Google Ads and GA4.

The primary tracking issues are defined as:

• Missing events: one of the five core ecommerce conversion events (page view, product view, add to cart, begin checkout, purchase) is not tracked on the site. This creates blind spots in the funnel, causing gaps in reporting and preventing ad platforms from optimising delivery and bidding on site interactions.

• Duplicate events: the same customer action fires more than once with the same event ID on the same platform. This distorts attribution and leads ad platforms to optimise against inflated conversion counts.

• Cookie consent issues: non-essential tracking fires before the user has given consent, or after they've declined it. Beyond the compliance exposure, this produces inconsistent data once a consent framework starts suppressing or altering what fires.

• Missing key parameters: the event fires, but critical details like purchase value or product identifiers don't come with it. This reduces its usefulness for things like product interaction learning, targeting optimisation, value-based bidding and audience building.

• Google Consent Mode issues: Consent Mode is implemented incorrectly or non-compliantly, which limits how accurately GA4 and Google Ads can model conversions, and in some cases restricts personalised remarketing.

These tracking issues are largely invisible from the inside, which is why they can sit unnoticed for months.

Findings

80% of brands have more than 1 primary tracking issue

Broken tracking is rarely isolated to a single fault. Of the 54 brands, 20% (11 brands) have exactly one primary tracking issue, 30% (16 brands) have two, 24% (13 brands) have three, and 22% (12 brands) have four.

4% of the brands we audited (2 brands) have all 5 issue types present at the same time.

Each primary issue affects a different part of the tracking chain: event coverage, event accuracy, event detail, or consent handling. When several are present together, the platforms involved are working with data that is incomplete or unreliable across more than one dimension at once, rather than a single, isolated gap.

GA4 is the most problematic platform: 94% of brands using it have an issue

Of the three platforms we assessed, GA4 has the highest issue rate, followed closely by Meta. Google Ads is less impacted, but the proportion is still significant. By platform:

GA4: used by 98% of brands (53 sites); 94% of those (50 brands) have at least one tracking issue on it.

Meta: used by 93% of brands (50 sites); 92% of those (46 brands) have an issue.

Google Ads: used by 87% of brands (47 sites); 66% of those (31 brands) have an issue.

It’s also worth noting that each platform is impacted by a different mix of issues.

GA4 has the highest issue rate, driven mainly by duplicate events and Consent Mode issues.

Meta's issue profile is narrower but almost universal within it. 44 of the 46 affected brands' Meta issues came down to missing parameters.

Google Ads had the lowest issue rate of the three, but the most severe kind of fault. Where a problem existed, it was more likely to be a core event missing than any other platform.

89% of brands are firing events without the data platforms need to use them

We found all five primary tracking issues across the cohort, but their prevalence varied dramatically.

Missing key parameters is the dominant fault, by a wide margin - affecting 89% of brands (48 sites). In most cases this looked like a Meta event firing correctly, but arriving without external_id, which is what Meta needs to match the event to a customer for Advantage+ targeting and audience building.

Google Consent Mode issues sit at exactly half the cohort, affecting 50% of brands (27 sites). Two patterns showed up repeatedly: Consent Mode signals marked as granted before the user had actually consented (gcs=G111 firing pre-consent), and sites stuck on Basic Consent Mode, which blocks measurement outright for any visitor who hasn't consented - rather than modelling it.

Basic mode is compliant, but it's also a straightforward trade of measurement accuracy for implementation simplicity. Most brands running it don't know they've made that trade.

Missing events affected 48% of sites (26 brands), most often on Google Ads, where view_item or add_to_cart were absent across the whole visit. Entirely missing events create blind spots in the funnel: reporting is incomplete, and ad platforms can't optimise delivery or bidding around an interaction they never see.

Duplicate events affected 41% of brands (22 sites), and were concentrated on GA4 - usually a page view or item view firing twice for the same page load, which inflates whatever GA4 reports as a conversion.

Cookie consent violations were the least common fault, affecting 32% of brands (17 sites), but arguably the most exposed one. These brands had tracking firing before consent was given, in some cases from a consent banner that was present but not actually wired up to block anything.

The pattern behind the numbers

What does all of this actually mean? 

Broken conversion tracking is universal in this cohort (100%), rarely limited to one fault (80% have more than one), and concentrated on GA4 - the platform most brands treat as their single source of truth.

These are some of the fastest-growing consumer brands in the UK, which means most of them are already spending meaningfully on the platforms this audit looked at. Broken tracking means misspent ad budget and business decisions made on distorted data - at exactly the point these brands are trying to scale.

For brands growing fast, closing this gap is one of the few advantages still up for grabs.

If you'd like to know where your brand stands, get in touch and we'll run the same audit on your site. 

If you're on the FEBE Growth 100, we've already run it - ask us and we'll share your results directly.