UK Trademark Bidding: Using Competitors’ Brand Names In Ads

If you run paid search ads (or you’re about to), you’ve probably wondered whether you can bid on a competitor’s brand name as a keyword.

It can feel like a quick win: your ad appears when someone searches for a rival, and you pick up sales that would otherwise go elsewhere. But in the UK, bidding on trade marks in search ads can be a legal and compliance tightrope - and if you get it wrong, it can turn into a costly dispute fast.

In this guide, we’ll break down what businesses need to know about trademark bidding in the UK, including the key legal risks, when bidding might be allowed, and how to reduce your exposure while still running effective campaigns.

This article is general information only and isn’t legal advice. If you’re dealing with a specific dispute or planning a campaign targeting competitor terms, get advice on your situation.

What Is Trademark Bidding (And What Does “Trademark Bidder” Mean)?

Trademark bidding usually means paying for ads to show when users search for a keyword that matches (or closely resembles) someone else’s registered trade mark - often a competitor’s brand name.

A trademark bidder is the advertiser that bids on those trade mark terms.

There are two practical “layers” to trade mark issues in paid search:

• Bidding on the keyword (in the background) so your ad is eligible to show.
• Using the competitor’s brand in the ad copy (the text users actually see), your display URL, or your landing page.

Those two things aren’t treated the same way in law or in platform policies. In many disputes, the highest risk comes from what the consumer actually sees - because that’s where confusion (or misleading impressions) happen.

Before you start bidding on competitor terms, it’s worth pressure-testing your own IP position too. If your brand is important to your growth, consider trade mark registration early, so you’ve got enforceable rights if competitors start targeting your name.

Is It Legal To Bid On A Competitor’s Trade Mark In The UK?

In the UK, bidding on a competitor’s trade mark can be lawful in some situations - but it can also cross the line into trade mark infringement, passing off, or misleading advertising.

The main legal framework is the Trade Marks Act 1994 (as amended), which protects registered trade marks and gives the owner rights to stop others using an identical or similar sign where that use affects the functions of the trade mark (including its ability to indicate origin).

UK courts apply principles developed in UK/EU case law on search advertising (including well-known cases such as Google France and Interflora). In practice, the central issue is usually whether the ad affects the trade mark’s “origin function” - meaning whether it makes it hard for an average consumer to tell whether the ad is from the trade mark owner (or an economically linked business) or from an unrelated third party.

At a practical level, the core question is often:

Does your ad (or landing page) make it unclear to a reasonably well-informed and observant internet user whether you are independent from the trade mark owner?

If your ad leads people to think:

• you are the competitor,
• you are affiliated with them,
• you’re an authorised reseller (when you’re not), or
• your products/services are the competitor’s products/services,

…then you’re in much riskier territory.

Keyword Bidding vs Using The Trade Mark In Ad Copy

Many trademark bidding disputes turn on the difference between:

• Invisible use (bidding on a keyword), and
• Visible use (showing the mark in ad copy, headlines, sitelinks, extensions, or on the landing page).

Even if keyword bidding alone might be defensible in certain contexts, using the competitor’s trade mark in the ad copy is far more likely to trigger complaints and enforcement - because it can more easily imply association or origin.

Don’t Forget “Passing Off”

Even if the competitor’s brand isn’t registered as a trade mark (or the registration doesn’t cover the relevant goods/services), you may still face a claim for passing off. That’s a common law claim that can apply where a business has built up “goodwill” in a name/brand and someone misrepresents themselves in a way that damages that goodwill.

Passing off claims often focus on misleading conduct and confusion - so your ad messaging and landing page content matter a lot.

When Can Trademark Bidding Become Infringement Or Unlawful Advertising?

If you’re bidding on competitor brand terms, these are the common ways campaigns go wrong (and why).

1) Your Ad Creates Confusion About Who You Are

This is the big one.

If the overall impression of your ad makes the user unsure whether you’re the competitor, connected to them, or endorsed by them, you’re increasing your risk of trade mark infringement and misleading advertising complaints.

This can happen through:

• using the competitor’s brand name in the headline
• phrases like “official”, “authorised”, “partner”, or “approved” (when that’s not true)
• a display URL that looks like it belongs to them
• a landing page that copies their trade dress or layout closely

2) You Make Comparisons That Aren’t Fair Or Verifiable

Comparative advertising can be legal in the UK, but it needs to be done carefully. If you say you’re “cheaper”, “better”, or “#1” versus a competitor, you should have evidence to back it up - and your comparison should be like-for-like.

From an ad compliance perspective (and often a dispute perspective), this is where a lot of businesses trip up. Ads that are unclear, exaggerated, or omit key context can be considered misleading.

If your growth plan relies on aggressive marketing, it’s worth checking your claims against the rules around misleading ads before you spend serious money scaling campaigns.

3) You Take Advantage Of A Competitor’s Reputation

Some trade marks have a strong reputation and can attract broader protection. If a mark has a “reputation” (in the legal sense), certain uses can be risky even if there isn’t clear confusion - for example, where the use takes unfair advantage of the mark’s distinctive character or reputation, or harms it.

In plain terms: if your campaign looks like it’s trying to piggyback off the competitor’s brand power, you’re increasing the chance of a complaint or claim.

4) You Trigger Platform Policy Complaints (Even If You Think You’re “Legally Right”)

Even where an advertiser thinks their conduct is lawful, ad platforms often have their own trade mark complaint processes. A competitor may be able to lodge a complaint that results in restrictions on your ad copy, even if you’re still technically allowed to bid on certain terms.

So, there are two risk tracks you need to manage:

• Legal enforcement (letters, claims, injunctions, damages)
• Platform enforcement (ad disapprovals, restrictions, account issues)

Practical Risk Management Tips For A Trademark Bidder

If you’re considering becoming a trademark bidder, your goal is usually simple: appear as a genuine alternative without misleading anyone.

Here are practical ways to reduce risk while still running competitive campaigns.

Keep The Competitor’s Trade Mark Out Of Your Ad Copy (In Most Cases)

As a general rule, bidding on a keyword is usually less risky than putting the competitor’s brand in the visible ad text.

If your strategy relies on mentioning a competitor by name, treat it as a “high risk” campaign that deserves a legal review before launch.

Make Your Brand Identity Obvious Immediately

Your ad should clearly present your business as the advertiser. That means:

• use your trading name prominently
• avoid vague headlines that could apply to anyone in the category
• ensure the landing page branding is clear “above the fold”

A surprising number of trade mark disputes come down to the user’s first impression - especially on mobile.

Avoid Suggesting Affiliation, Partnership, Or “Official” Status

Unless you genuinely have a commercial relationship with the competitor (and you have the rights in writing to describe it that way), avoid words that imply endorsement.

If you do have reseller or distribution arrangements, make sure your rights to use names/logos are clearly covered in your commercial documents (and that your marketing team understands the boundaries).

Use Clean, Substantiated Comparative Claims

If you’re comparing yourself to a competitor, keep it:

• objective (based on measurable criteria)
• current (up to date pricing/features)
• like-for-like (same product tier, same period, same assumptions)
• documented (you can prove it if challenged)

Also consider where those claims appear. A landing page comparison table might allow more nuance than an ad headline, which is naturally brief and can accidentally mislead.

Be Careful With Dynamic Keyword Insertion And Auto-Generated Assets

Some ad formats automatically insert the searched keyword into the headline, or generate headlines based on your landing page content.

If you’re bidding on competitor terms and using automation, you can accidentally publish the competitor’s trade mark in your ad copy without meaning to. That’s a common “we didn’t realise” moment that still creates real risk.

If you run campaigns on competitor terms, it’s smart to audit:

• dynamic keyword insertion settings
• automatically created assets/headlines
• sitelinks and callouts
• any feeds used for ad generation

Don’t Use Trade Mark Symbols Incorrectly

Trade mark symbols can also create the wrong impression. If you use “®” when you don’t have a registered trade mark, or you use symbols in a way that implies the competitor’s brand is yours, you may create additional risk.

Keeping your marketing compliant on this point is simple but important - especially if your ads and landing pages are produced quickly. Getting familiar with trade mark symbols is a good baseline for your team.

What Should You Do If A Competitor Complains About Your Ads?

If you’re running trademark bidding campaigns, there’s a decent chance you’ll eventually receive an email alleging infringement, misleading conduct, or “unauthorised use”.

Don’t panic - but don’t ignore it either.

Step 1: Pause And Preserve Evidence

Before you change everything, take a snapshot of what’s live:

• screenshots of ads (including variations)
• the keywords targeted and match types
• your landing page (and any A/B variants)
• dates, impressions, and targeting settings

This helps your lawyer assess what was actually happening (and what the user would have seen) and prevents disputes about the facts.

Step 2: Work Out What They’re Actually Objecting To

Competitors can complain about different things, including:

• bidding on a keyword
• visible use of the brand name in ad copy
• use of the brand on the landing page
• comparative claims
• implied affiliation

Each has a different risk profile and different options for resolving quickly.

Step 3: Decide Whether To Amend, Defend, Or Negotiate

Sometimes the fastest, cheapest outcome is to adjust the ad copy (or remove automated insertions) while you consider the bigger strategy.

Other times, the complaint is overreaching - and you may decide to push back, especially if your ad is clearly branded as yours and not misleading.

Where there’s a threat of legal action, get advice early. A well-structured response can stop a situation escalating unnecessarily, and it can also protect your position if it does escalate. If you need to put your position on record, a carefully drafted cease and desist letter (or response letter) is often part of the process.

Step 4: Tighten Internal Controls So It Doesn’t Happen Again

If you use an agency or freelancers, check the contract terms and scopes. Who is responsible for compliance? Who approves ad copy? What happens if you get a complaint?

If you’re scaling paid search, it also helps to make sure your agency agreement (or marketing services agreement) clearly covers approval processes, compliance responsibilities, and what happens if you receive a platform complaint or legal letter.

What Else Should Small Businesses Consider Before Running Trademark Bidding Campaigns?

Trademark bidding isn’t just a legal question - it’s an operational one too.

Before you go live with competitor-term campaigns, it helps to check these extra areas that often get overlooked.

Your Data And Tracking Compliance

Paid ads usually involve tracking: cookies, pixels, remarketing audiences, analytics, and conversion measurement. That can trigger privacy compliance obligations under the UK GDPR and the Data Protection Act 2018.

Even if your ad copy is perfect, weak privacy compliance can still create real risk - especially if you’re scaling spend and collecting more personal data. If you collect personal data through your landing pages, you’ll generally need a clear Privacy Policy and a properly set-up cookie approach.

Your Brand Protection Strategy (So Others Don’t Do It To You)

Many business owners only start thinking about trade marks after a competitor starts bidding on their name.

If you want to protect your brand long-term, think about:

• registering key brand assets (business name, product names, key slogans)
• using consistent branding so your goodwill is easier to show
• having a plan for responding to infringements quickly

This is one of those “do it early and thank yourself later” legal foundations that can support your growth.

Reputation And Customer Trust

Even if a trademark bidding approach might be defensible, it can still annoy customers if it feels too aggressive or confusing.

One simple test: if a customer screenshots your ad and posts it publicly, would it clearly look like you’re a legitimate alternative - or would it look like you’re trying to trick them?

Long-term, trust is usually worth more than a short-term spike in clicks.

Key Takeaways

• Being a trademark bidder (bidding on competitor brand names as keywords) can be lawful in the UK, but it becomes risky when your ad or landing page creates confusion about who you are or suggests affiliation.
• The highest risk usually comes from using a competitor’s trade mark in visible ad copy, not just bidding on the keyword behind the scenes.
• Trade mark infringement, passing off, and misleading advertising are the main legal problem areas - so your ad messaging, branding clarity, and comparative claims matter.
• If you use automation (dynamic keyword insertion, auto-generated assets), you should audit it carefully, because it can accidentally publish competitor brand names in your ads.
• If a competitor complains, preserve evidence, identify what conduct they’re challenging, and get legal advice early so you can respond strategically (rather than reactively).
• Strong legal foundations - including trade mark registration and privacy compliance - make it easier to scale ads confidently.

If you’d like help reviewing a trademark bidding strategy, responding to a complaint, or protecting your brand, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.