Choosing an Amazon ad agency is one of the highest-stakes decisions a brand makes on the platform. Hand your budget to the right team and you unlock profitable, compounding growth. Hand it to the wrong one and you watch your ad spend climb while your margins quietly erode, often without a clear explanation of what went wrong. With cost-per-click rising year on year and the advertising landscape now spanning Sponsored Ads, DSP, and full-funnel strategy, the gap between a good agency and a poor one has never been wider.

The problem is that every agency claims to be the best. Sift through the market and you find hundreds of firms, from one-person consultancies to enterprise operations managing nine-figure budgets, all promising lower ACoS and explosive growth. Cutting through that noise is hard, especially when the cost of a wrong choice is months of lost momentum.

This guide is built to work as a complete buying guide. It reviews the top 20 Amazon ad agencies in 2026, drawn from both the UK and the US, and explains what each one does best and who it suits. Then it walks you through the whole decision: how to know you are ready, how to choose the right Amazon advertising partner, the step-by-step selection process, what to ask before you sign, the red flags to avoid, what it should cost, what good onboarding looks like, how to measure whether your agency is working, and when to switch. Whether you are a growing brand looking for your first agency or an established seller ready to change partners, this is the shortlist and the framework to make the decision with confidence.

What Does an Amazon Ad Agency Actually Do?

Before comparing names, it helps to be clear on what you are actually buying. The term "Amazon ad agency" covers a spectrum, and understanding the scope prevents you from overpaying for services you do not need or, worse, hiring a PPC specialist when you really need full account management.

At its core, an Amazon ad agency manages your paid advertising on the platform. That means building and optimising Sponsored Products, Sponsored Brands, and Sponsored Display campaigns, managing bids and budgets, harvesting profitable keywords, and cutting wasted spend. The strongest agencies also run Amazon DSP for programmatic and retargeting campaigns, giving you a full-funnel reach that goes beyond search. This is the heart of Amazon PPC management, and for many brands it is the single most valuable service an agency provides.

Many agencies go further into full account management. This wider remit can include listing optimisation, A+ Content and brand store design, SEO and keyword strategy, inventory and operational support, brand protection, and reporting across the whole account rather than just advertising. A full-service Amazon agency treats advertising as one lever inside a coordinated growth strategy, which matters because ad performance depends heavily on the quality of your listings, your pricing, and your stock position. The right scope for you depends on whether you need a specialist to sharpen one area or a partner to run the whole marketplace.

Do You Need an Amazon Ad Agency? Signs It's Time

Not every brand needs an agency, and a good one will tell you so. Hiring too early can mean paying for capacity you cannot yet use, while hiring too late can mean months of wasted spend and lost rank. The goal is to recognise the moment when outside expertise will return more than it costs.

The signs that point to hiring

The most common trigger is simply running out of time or expertise. As your catalogue and ad spend grow, Amazon advertising becomes a full-time job in itself, and the auction moves faster than a busy founder or a stretched marketing manager can keep up with. If your campaigns are running on autopilot because nobody has time to optimise them, you are almost certainly leaving money on the table.

A second trigger is a performance plateau, where sales have stalled or your ACoS has crept up and your own efforts are no longer moving the needle. An experienced team often spots structural issues, such as poor campaign architecture, wasted spend on unprofitable search terms, or untapped DSP opportunities, that are hard to see from the inside. A third is a change in ambition: launching into new marketplaces, preparing for a major event like Prime Day, or pushing for aggressive growth ahead of a raise or an exit. Each of these raises the complexity and the stakes to a level where specialist help pays off.

As a rough rule of thumb, brands spending more than a few thousand pounds a month on ads, or turning over enough that a few points of ACoS improvement is material, usually benefit from professional management. Below that, the fee can outweigh the gains, and software or a freelancer may serve you better for now.

Agency vs in-house vs freelancer vs software

It is worth weighing the alternatives honestly, because an agency is not the only route. Building an in-house team gives you the most control and dedicated focus, but it is expensive and slow to hire for, and a single specialist still leaves you exposed if they leave. Software can automate bidding effectively if you want to keep strategy in-house and simply remove the manual workload, though it will not set direction or fix a weak account structure on its own. A freelancer can be a cost-effective option for smaller accounts, but you take on more management overhead and considerable key-person risk.

An agency sits between these. You get a whole team rather than one person, senior expertise you could not afford to hire full-time, and a partner who is accountable for results across the account. The trade-off is that you are one client among several, so the quality of communication and the seniority of your day-to-day contact matter enormously. We cover the freelancer comparison in more depth in our guide on choosing between an Amazon PPC agency or a freelancer. For most scaling brands that want advertising off their plate without losing strategic rigour, a well-chosen agency usually pays for itself.

How We Ranked the Top 20 Amazon Ad Agencies

To keep this list useful rather than arbitrary, every agency below was assessed against the same criteria. No single firm wins on all of them, which is exactly why the "best" agency depends on your situation.

We looked first at proven results and case studies, because credible evidence of growth matters more than marketing copy. We weighed Amazon partner credentials, such as Amazon Ads Verified or Advanced Partner status, which signal platform expertise and direct access to Amazon support. We considered specialism and scope, separating full-service agencies from PPC-only specialists, and noted who each one serves best, from early-stage brands to enterprise sellers. We also valued transparency in reporting and pricing, since the agencies worth trusting are open about what they do and what it costs. Finally, we factored in team depth and the breadth of services, including DSP and full-funnel capability.

With that framework in mind, here are the top 20 Amazon ad agencies for 2026.

The Top 20 Amazon Ad Agencies in 2026

1. Flairox

Flairox tops our list as a focused, senior team built around one goal: profitable, defensible growth. Its biggest edge is the calibre of attention each client receives, with genuine founder-level engagement rather than a junior manager juggling dozens of accounts, which is exactly what the large enterprise agencies struggle to match. A disciplined, sprint-based method keeps spend tied to outcomes, and the results show it: Flairox grew matcha brand PerfectTed from £90,000 to £250,000 in five months and made it the number one matcha on Amazon UK. You can explore the full scope on the Flairox Amazon advertising services page.

Best for: Small and medium-sized businesses wanting hands-on, strategy-led management Location: US

Key services: Sponsored Ads, Amazon DSP, listing and catalogue optimisation, full Amazon account management

Pros:

• Founder and senior attention, not junior account managers
• Transparent, profit-focused reporting
• Hands-on, strategy-led partnership

Cons:

• Boutique team, not built for $50M+ enterprises

2. Tinuiti

Tinuiti is the largest independent performance marketing agency in the US and an Amazon Ads Advanced Partner, with its Amazon practice embedded in a much broader retail-media operation. Its real advantage is scale and integration: it can coordinate Amazon with Google, Meta, TikTok, and CTV under one unified lens, which a smaller Amazon-only shop cannot replicate. The trade-off is that this is built for big budgets, so a smaller brand may end up a minor account without senior, day-to-day attention.

Best for: Large enterprise brands ($50M+) needing coordinated, multi-channel media Location: US

Key services: Sponsored Ads, Amazon DSP, Amazon Marketing Cloud, creative, cross-channel media

Pros:

• Unmatched scale and integration
• Advanced Partner access to Amazon
• Unified cross-channel reporting

Cons:

• Built for very large budgets
• Smaller brands may lack senior attention

3. SalesDuo

SalesDuo is a full-service agency founded by a former Head of Amazon Vendor Management, with a team largely made up of ex-Amazon employees. That insider pedigree underpins a heavily data-led approach built on proprietary BI dashboards and AI-assisted optimisation. It manages advertising and operations together across more than 250 brands, so it has seen most of the problems a growing brand is likely to face.

Best for: Mid-market and larger brands valuing insider expertise and data | Location: US / UK

Key services: PPC, DSP, account management, 1P and 3P operations, BI reporting

Pros:

• Genuine insider Amazon expertise
• Strong data and reporting
• Ads and operations handled together

Cons:

• Geared to mid-market and larger brands
• Less boutique, personal attention

4. Olifant Digital

Olifant Digital is one of the most rigorous advertising specialists, frequently topping independent rankings. It sets a high hiring bar and reviews client campaigns daily rather than weekly, treating advertising as a craft focused on structure, measurement, and incremental gains. That intensity comes at a premium and is aimed at brands with the spend to justify it.

Best for: Serious and enterprise brands that value depth of expertiseLocation: US

Key services: Sponsored Ads management, high-frequency bid optimisation, campaign strategy

Pros:

• Senior-only staffing
• High-frequency optimisation
• Deep, specialist PPC expertise

Cons:

• Premium pricing
• Best suited to larger ad spend

5. Nuanced Media

Founded in 2010 and an Amazon Verified SPN Partner, Nuanced Media is one of the longer-established full-service agencies, with more than $100M in facilitated sales and clients such as Dollar Shave Club and True Citrus. Its appeal is breadth backed by experience, letting a brand consolidate most of its Amazon needs with one steady, knowledgeable partner rather than a niche specialist.

Best for: Brands wanting an established, full-service one-stop partnerLocation: US

Key services: PPC, DSP, listing optimisation, brand management, creative, inventory support

Pros:

• Long, proven history
• Wide service menu in one place
• Deep institutional platform knowledge

Cons:

• Generalist rather than niche specialist
• US-based

6. My Amazon Guy

My Amazon Guy is a full-service agency well known for its prolific educational content, which reflects real operational depth, especially around the catalogue and listing problems that quietly hold many accounts back. Backed by a large team, it tackles the technical and support issues smaller agencies often avoid, though experience can vary between account managers, so it pays to confirm who will run your account.

Best for: Small to mid-sized sellers wanting accessible full service Location: US

Key services: PPC, SEO, catalogue and listing management, design, troubleshooting

Pros:

• Strong operational problem-solving
• Accessible, broad services
• Great for catalogue and listing issues

Cons:

• Quality can vary by account manager
• Large, fast-moving agency

7. Channel Key

Channel Key is a consistently top-ranked full-service agency that positions itself as a strategic growth partner rather than a pure media buyer. It works with brands on the bigger questions of catalogue strategy, pricing, and positioning, then executes the advertising and operations to support them. That senior-led, consultative model suits brands that want help shaping direction, not just campaigns run to a brief.

Best for: Established brands wanting strategy plus execution Location: US

Key services: Advertising, account management, Amazon growth strategy

Pros:

• Senior, strategic guidance
• Whole-account perspective
• Strong reputation

Cons:

• Best suited to established scale
• Not a budget option

8. Incrementum Digital

Incrementum Digital is an advertising-focused agency built around incrementality, the principle of measuring whether ad spend genuinely drives sales you would not have won organically. Founded by a respected PPC practitioner, it brings a sharp analytical lens aimed at real profitability rather than flattering attributed revenue. This rigorous, advertising-first approach suits brands that value measurement over a long service menu.

Best for: Data-driven brands wanting measurable lift Location: US

Key services: Sponsored Ads, incrementality analysis, campaign optimisation

Pros:

• Rigorous measurement
• Targets real profitability
• Deep PPC expertise

Cons:

• Narrow, ads-only focus
• Best for data-minded brands

9. Envision Horizons

Envision Horizons is a tech-enabled agency that pairs strategic consulting with its proprietary myHorizons platform, giving clients real-time insight into product and advertising performance. The combination of human strategy and in-house software is its core differentiator, offering a clearer, consolidated view than the standard console alone and supporting faster, better-informed decisions.

Best for: Data-minded brands that want transparency Location: US

Key services: PPC, DSP, listing optimisation, campaign automation, analytics platform

Pros:

• Transparent, real-time data
• Human strategy plus proprietary tools
• Clear visibility into decisions

Cons:

• Tech may exceed small-brand needs
• US-based

10. Canopy Management

Canopy Management is a full-service agency focused on growth for DTC and consumer brands, treating advertising as part of a wider growth engine rather than a standalone service. By aligning campaigns with listing quality and conversion, it aims to grow paid visibility and organic rank together, which tends to produce more durable results than advertising alone.

Best for: Growing DTC brands wanting coordinated growth Location: US

Key services: Advertising, listing optimisation, account management

Pros:

• Joined-up growth approach
• Durable results, not just a lower ACoS
• Single partner across the account

Cons:

• Geared to growing DTC brands
• US-based

11. Thrive Agency

Thrive is a broad digital marketing agency with a dedicated Amazon practice, so clients can access Amazon expertise alongside web, SEO, paid search, and social. For a brand that wants one agency across its whole digital footprint, that breadth and single point of accountability are the main draw, though a generalist may not go as deep on Amazon-specific nuance as a dedicated specialist.

Best for: Brands wanting a one-stop digital partner Location: US / Global

Key services: Amazon ads, plus web, SEO, paid search, and social

Pros:

• Manage all channels in one place
• Broad capability
• Connected, consolidated strategy

Cons:

• Generalist, less Amazon-deep
• Amazon is one of many services

12. AMZDUDES

AMZDUDES is an award-winning agency with around 50 specialists and strong third-party reviews, reporting more than $112M in client revenue generated. Its positioning is firmly performance-led across advertising, strategy, and SEO, and the combination of a sizeable specialist team and consistent reviews offers reassurance that can be hard to find among newer agencies.

Best for: DTC brands and 3P sellers wanting proven results Location: US

Key services: Advertising, strategy, SEO

Pros:

• Strong reviews and social proof
• Clear performance focus
• Solid track record

Cons:

• Mid-market positioning
• US-based

13. Amazon Growth Lab

Amazon Growth Lab is a full-service agency built around ROAS and revenue growth, with a high share of clients reporting significant gains. Growth is the organising principle, combining advertising with the wider account work needed to scale profitably, which suits brands that want to be measured on outcomes rather than activity.

Best for: Results-first brands focused on ROAS Location: US

Key services: Advertising, account management, growth strategy

Pros:

• Consistent reported results
• Clear ROI focus
• Full-service scaling

Cons:

• Less niche specialism
• US-based

14. Emplicit

Emplicit is a full-service marketplace agency fluent in both 1P and 3P Amazon as well as other marketplaces, an unusual and valuable combination for brands running hybrid vendor and seller setups. It brings advertising, content, and operations together with the infrastructure to coordinate across channels at scale, reducing the number of vendors a complex brand has to manage.

Best for: Established and enterprise multi-channel brands Location: US

Key services: Advertising, content, operations, 1P and 3P, multi-marketplace

Pros:

• Handles complex hybrid setups
• Multi-channel coordination
• Fewer vendors to manage

Cons:

• Overkill for single-marketplace sellers
• Enterprise-leaning

15. GNO Partners

GNO Partners was founded by operators who have scaled large Amazon businesses themselves, and that practitioner background shapes its pragmatic, profit-focused approach to PPC and catalogue management. Clients work with people who have run sizeable accounts, which lends real credibility to its advice and focuses the work on the levers that actually move a mature account forward.

Best for: Mid-to-large brands wanting operator expertise Location: US

Key services: PPC, catalogue management, growth strategy

Pros:

• Real operator experience
• Profit-focused advice
• Hands-on management

Cons:

• Mid-to-large brand focus
• US-based

16. Lezzat

Lezzat is a multi-award-winning, London-based agency founded in 2018 by active Amazon sellers, managing more than 500 brands across global marketplaces. Its seller-led DNA, deep library of standard operating procedures, and in-house creative let it handle both the technical and brand-building sides of Amazon under one roof, with particular relevance for brands selling into the UK and Europe.

Best for: UK and European brands wanting full serviceLocation: UK

Key services: End-to-end Amazon management, advertising, creative

Pros:

• Seller-led instincts
• UK and EU market focus
• Process and creative under one roof

Cons:

• Primarily UK and EU oriented
• Mid-market focus

17. Optimizon

Optimizon is a leading UK agency and an Amazon Ads Verified Partner with more than 16 years of experience and over £100M in client sales. Its team is formally certified across Sponsored Ads, planning, strategy, and DSP, giving risk-conscious brands accredited expertise and a credible, proven track record rather than self-taught generalists.

Best for: UK brands wanting an established, certified partner Location: UK

Key services: Sponsored Ads, DSP, planning and strategy, full advertising coverage

Pros:

• Proven, credible track record
• Formally certified expertise
• Full advertising coverage

Cons:

• Less novel or experimental
• UK-focused

18. WAKE Commerce

WAKE Commerce is a UK agency focused squarely on advertising and measurable ROI, keeping ad-spend efficiency at the centre rather than spreading across a long service list. It suits brands that already have their listings and operations in hand and want a specialist to drive advertising performance, with the time-zone and market alignment domestic brands value.

Best for: UK brands wanting a focused ads specialist Location: UK

Key services: Amazon advertising management, ad-spend optimisation

Pros:

• Sharp advertising focus
• Performance-led
• UK-based

Cons:

• Not a full-service agency
• Best when listings are already strong

19. BellaVix

BellaVix is an Amazon-focused agency specialising in account management and PPC, with a strong reputation for responsive client service and reported returns around 4.5x ROAS. For smaller and mid-sized brands, its attentiveness and communication often matter as much as raw capability, and it keeps advertising connected to overall account health.

Best for: Small and mid-sized brands wanting close support Location: US

Key services: Account management, PPC, account-health monitoring

Pros:

• Highly responsive and attentive
• Great for smaller brands
• Account-health focus

Cons:

• Smaller-scale focus
• Less enterprise infrastructure

20. Levo

Levo (LEVO Agency) is a specialist built around defensible growth, combining PPC, Amazon DSP, and conversion rate optimisation. Including CRO is what sets it apart: it looks at the entire journey from click to conversion, improving both the traffic and the page it lands on to lift efficiency from both ends for lasting rather than short-term gains.

Best for: Brands wanting sustainable, defensible growth Location: US

Key services: PPC, Amazon DSP, conversion rate optimisation

Pros:

• Improves traffic and conversion together
• Sustainable, not short-term
• Advertising-first specialist

Cons:

• Ads and CRO focus, not full operations
• US-based

Honourable mention: Acadia

Acadia (known for its Marketplace Strategy and Flywheel heritage) is a well-regarded enterprise retail-media agency worth considering for very large brands. It narrowly missed the main list but remains a strong option for enterprises that need deep retail-media expertise across Amazon and beyond, particularly those running substantial budgets across multiple retailers.

Top 5 Picks at a Glance

If the full list feels like a lot to weigh, these five cover the most common needs, from hands-on management for smaller brands to enterprise-scale media.

How to Choose the Right Amazon Advertising Partner

A list of strong agencies is only useful once you can match one to your brand. The right choice depends less on which firm is objectively "best" and more on which is best for your stage, budget, and goals. Work through the factors below in order and the field narrows quickly.

Define your goals and scope first

Before you speak to anyone, write down what you actually want. Are you trying to launch new products, defend market share, lower ACoS, grow profitably toward a target, or prepare for a sale? Your primary goal shapes which agency fits, because a team built for aggressive launch growth works differently from one built for efficient, margin-protective management. Then decide on scope: do you need a PPC-only specialist to sharpen advertising, or a full-service partner to run listings, content, and operations as well? If your listings and catalogue are already strong and advertising is the gap, a specialist like Levo or Incrementum may be ideal. If you need a partner to own the marketplace end to end, a full-service agency such as Flairox, Nuanced Media, or Lezzat is the better fit.

Match the agency's size to your brand

Size compatibility matters more than most brands realise. Enterprise brands with large, complex accounts and cross-channel needs gravitate toward agencies like Tinuiti or Emplicit, which are built for that scale. But the same firms may treat a smaller brand as a minor account that juniors manage. Conversely, a boutique agency may give a growing brand senior, hands-on attention but lack the infrastructure an enterprise needs. The sweet spot is an agency where your account is large enough to matter to them but not so large that it strains their capacity. Ask where you would sit in their client roster and who, specifically, would manage your account day to day.

Weigh category and channel experience

Experience in your specific category is a genuine advantage, because advertising dynamics differ sharply between, say, supplements, electronics, and homeware. An agency that has grown brands like yours will understand the compliance quirks, seasonality, and competitive patterns from day one. Equally, consider channel needs: if Amazon DSP and full-funnel reach are part of your plan now or in the near future, shortlist agencies that already offer it, such as Flairox, Tinuiti, Levo, and Optimizon, so you do not outgrow your partner within a year.

Consider geography and communication

A US brand may prefer a partner in its own time zone with local market knowledge of Amazon US, which is where Flairox, Levo, and Incrementum stand out. Time-zone overlap affects how quickly issues get resolved and how naturally the agency feels like part of your team. Communication style matters just as much as capability: agree up front on reporting cadence, the channels you will use, and how quickly you can expect responses.

Look at their tools, reporting, and transparency

Finally, examine how an agency proves its work. The best partners give you clear, regular reporting tied to the metrics that matter, and many bring proprietary dashboards or analytics, as Envision Horizons and SalesDuo do. Understanding the metrics that matter most in Amazon advertising will help you judge whether their reporting is meaningful or just decorative, and will let you hold any agency accountable once they start.

The Agency Selection Process, Step by Step

Once you know what you are looking for, a structured process keeps the decision objective rather than emotional. Rushing it is how brands end up locked into the wrong partner.

Begin by building a shortlist of three to five agencies that fit your scope, size, and category, using a list like this one as a starting point. Reach out and book a discovery call with each, treating it as a two-way interview where you explain your goals and they explain their approach. Pay attention to whether they ask sharp questions about your business or simply pitch; the good ones diagnose before they prescribe.

Next, ask each shortlisted agency for a proposal and, ideally, a light audit of your account. A serious agency will look at your current advertising and point to specific opportunities and problems, which both demonstrates expertise and shows you they have actually engaged with your account rather than sending a template. Request case studies or references from brands similar to yours in size and category, and actually call those references to ask what working with the agency is really like, especially how they handle underperformance.

Finally, compare proposals on substance, not just price. Look at the scope of work, who will manage your account, the reporting you will receive, the contract terms, and the strategy they propose, then weigh all of that against the fee. Where possible, structure the start as a defined initial period with clear success criteria, so both sides can confirm the fit before committing long term.

Questions to Ask Before Hiring

Once you have a shortlist, the right questions during the pitch will reveal far more than any polished case study. Group them into three areas.

On the team and account management, ask who will actually manage your account day to day, since the senior person in the pitch is not always the one doing the work. Ask how many accounts that person handles, what their experience is, and who your point of contact will be. A named, experienced contact rather than a rotating cast is a strong positive signal.

On strategy and measurement, ask which metrics they optimise toward, and listen for an answer rooted in profitability and incrementality rather than just top-line sales or a flattering ACoS. Ask how they would approach your account specifically in the first 90 days, how they handle Amazon DSP and full-funnel strategy, and how they decide where to push spend and where to pull back. The depth of these answers separates genuine strategists from button-pushers.

On reporting, contracts, and results, ask how often you will receive reports and what they contain, whether you retain full ownership and access to your advertising account and data, what the contract length and exit terms are, and to see results from brands similar to yours in size and category. Clear, confident answers here indicate a partner used to being held accountable.

Red Flags to Avoid

Just as important as the right answers are the warning signs that should give you pause. Be wary of any agency that guarantees specific results, because no one can promise a precise ACoS or revenue figure in a live auction, and a guarantee usually signals either inexperience or a willingness to mislead. Treat opaque reporting as a red flag, since a partner who cannot or will not show you exactly what they are doing, and what it is delivering, is one to avoid.

Be cautious of long lock-in contracts with no performance break clauses, which protect the agency rather than you. Watch for agencies that take a percentage of your ad spend with no incentive to keep that spend efficient, because their interests and yours can quietly diverge. Other signals worth noting include vague or generic strategies that could apply to any brand, pressure to sign quickly, a refusal to share who will actually run your account, and an unwillingness to provide references. The best partners are transparent, accountable, comfortable being measured, and relaxed about giving you time to decide.

How Much Do Amazon Ad Agencies Cost?

Pricing is one of the most common questions brands have, and the honest answer is that it varies with your spend and the scope of work. Understanding the models, what is included, and how to judge value will help you compare proposals fairly.

The three common pricing models

Most Amazon ad agencies use one of three models. A flat monthly retainer gives you predictable costs regardless of spend, which scaling brands tend to prefer because the fee does not balloon as their budget grows. A percentage of ad spend, often somewhere in the region of 10 to 20 percent, ties the fee to your budget but can become expensive as you scale and offers the agency less incentive to keep spend lean. A hybrid model blends a base retainer with a smaller performance or spend-based component, aiming to align incentives while keeping some predictability. A few agencies also offer performance-based pricing tied to revenue or profit growth, which can align interests well but needs clear definitions to work fairly.

What you should expect to pay

As a rough guide, agency fees commonly range from around £800 per month for smaller accounts or focused PPC management to £5,000 or more per month for full-service management of larger, complex accounts. Where you land depends on your ad spend, the breadth of services, and the seniority of the team. Enterprise engagements with DSP and cross-channel work can run well beyond that. Always clarify what sits inside the fee and what costs extra, since creative work, listing optimisation, DSP management, or additional marketplaces are sometimes priced separately.

How to judge value, not just cost

The key is to look at value rather than headline price, because a more expensive agency that lifts your profitability and frees your time can deliver a far better return than a cheap one that quietly wastes spend. Frame the decision in terms of return: if an agency charges £3,000 a month but improves your account by far more than that in added profit and recovered waste, it is inexpensive in real terms. Ask each agency to walk you through the return a similar client has seen, and treat the fee as an investment measured against the growth and margin it protects, not a cost to minimise.

What to Expect When You Onboard a New Agency

Knowing what a good start looks like helps you judge whether a new partner is on track. The first weeks set the tone for the whole relationship.

A strong onboarding usually begins with a discovery and audit phase, where the agency digs into your account, your goals, your margins, and your competitors, and shares an honest assessment of where you stand. From there they should present a clear plan with priorities and a roadmap, rather than diving straight into changes. Expect them to restructure campaigns, fix obvious waste, and set up reporting and tracking in the first month, with performance improvements typically following over the subsequent two to three months as the account stabilises and the data matures.

Be realistic about the timeline. Meaningful results from Amazon advertising changes rarely appear overnight, because the auction and the algorithm need time to respond, and aggressive early changes can cause short-term volatility before things settle. A trustworthy agency will set this expectation up front rather than promising instant transformation. What you should see immediately, though, is clear communication, a named contact, and a sense that someone competent has taken ownership of the account.

How to Measure Whether Your Agency Is Working

Once an agency is running your account, you need a way to judge performance objectively rather than on gut feel. Agree the key metrics up front so everyone is aligned on what success looks like.

The headline numbers most brands track are ACoS and its inverse, return on ad spend, alongside total advertising cost of sales, or TACoS, which shows advertising spend as a share of total revenue and is often the truest measure of whether advertising is driving efficient overall growth. Look also at total sales and revenue growth, your share of organic versus paid sales over time, and impression share or visibility for your priority keywords. A good agency improves the efficiency metrics while still growing the top line, rather than simply slashing spend to flatter ACoS at the expense of sales.

Beyond the numbers, weigh the quality of the relationship. Are reports clear and delivered on time? Does your contact explain the reasoning behind their decisions and respond promptly to questions? Do they bring proactive ideas rather than waiting to be chased? Strong communication and transparency are leading indicators that the results will follow, while silence and vague reporting tend to precede disappointment.

When to Switch or Rethink Your Agency

Even a good relationship can run its course, and recognising the signs early saves money and momentum. Consider a change when performance has stalled for a sustained period despite a healthy account and market, when reporting becomes opaque or communication slows, when your account is clearly being handled by junior staff without senior oversight, or when the agency has stopped bringing fresh ideas and is simply maintaining the status quo.

Before switching, raise your concerns directly, because a capable agency will often respond with renewed focus or a more senior resource. If nothing changes, plan the transition carefully: ensure you retain full ownership of your advertising account and historical data, agree a clean handover, and line up the new partner before ending the old relationship to avoid a gap in management. Switching well is disruptive but recoverable, whereas staying with a partner who has stopped delivering quietly compounds the cost over time.

Conclusion

The top Amazon ad agencies in 2026 span a wide range, from enterprise retail-media operations like Tinuiti to focused advertising specialists like Levo and Incrementum, and full-service partners like Flairox, Nuanced Media, and Lezzat. There is no single best agency for every brand, only the best fit for your stage, your budget, and your goals. The framework matters more than the ranking: define your scope, weigh your size and geography, ask the hard questions, and choose a partner who is transparent and accountable.

If you want a partner that pairs full-funnel Amazon advertising with the marketplace strategy to back it up, Flairox would welcome the conversation. Our team builds and manages campaigns designed to protect your margins while scaling your sales, with the kind of hands-on, sprint-based attention that turns ad spend into durable growth. Book a free Amazon advertising audit and we will show you exactly where your account is leaking spend and where the biggest opportunities lie.