Search for “top Amazon marketplace agencies” and you will find a familiar pattern: long rankings, polished agency descriptions, impressive logos, and a few sensible questions about PPC, DSP, SEO, creative and reporting.
That content is useful. It helps you build a shortlist. But it also creates a dangerous shortcut for brands spending real money on marketplace advertising: the assumption that the “best” agency is the one with the broadest service menu or the biggest Amazon badge.
For a Dutch or Belgian ecommerce brand spending €5K+ per month across Amazon, bol and MediaMarkt, that is too thin. The better question is not “who is the top Amazon agency?” The better question is: which agency can make profitable spend decisions with our SKU margins, stock constraints and marketplace mix?
I call the mistake the agency logo trap. A brand picks the agency that looks strongest in a listicle, then discovers three months later that ROAS improved while contribution margin did not. Campaigns became tidier. Reports became prettier. The P&L stayed annoyed. Very rude of the P&L, but also very honest.
This guide gives you a profit-first scorecard for choosing an Amazon and marketplace advertising agency. It is for operators who need Amazon Ads, bol Sponsored Products and MediaMarkt retail media managed as one commercial system, not three isolated ad accounts.
What competitor agency lists cover well
The best ranking pages do several things right. Podean’s marketplace agency list frames Amazon work as part of a broader marketplace operating model: retail media, content, analytics, vendor negotiations, global expansion and profitability. SalesDuo’s comparison goes deep on full-service Amazon management, including SEO, listings, Seller Central, Vendor Central, BI and operations. Canopy Management puts more weight on TACoS, DSP, AI readiness and the relationship between paid ads and organic ranking. NovaData’s large directory is useful for discovery because it filters many agencies by category, geography, marketplace focus and service type. InBeat and Influencer Marketing Hub focus more specifically on Amazon advertising specialists, PPC expertise, bid-level control, creative fit and transparency.
That is a strong base. If you are building a first shortlist, those pages help you understand the market.
But most lists stop before the buying decision becomes uncomfortable. They rarely show how to choose between a global full-service agency and a lean PPC specialist when your own SKU mix has different margins. They rarely ask what happens when Amazon is growing but bol is more profitable. They rarely score whether an agency can say “do not scale this campaign” when ROAS looks good but stock cover is low. And they almost never localize the decision for NL/BE sellers who run Amazon.nl, Amazon.de, bol.com and MediaMarkt at the same time.
That is the gap FiveX can own: agency selection should start with profit operating fit, not with reputation alone.
The profit-first agency scorecard
Use this scorecard before you sign. Give each category a score from 1 to 5. A good agency does not need a perfect 50. But if the total is below 35, or if any of the first three categories scores under 3, you are probably buying activity rather than accountable marketplace growth.
1. SKU margin intelligence
Can the agency manage bids and budgets against SKU-level contribution margin, not one account-wide ACOS target?
This is the first gate. Amazon advertising performance is not profitable just because campaign ACOS is below a nice round number. A beauty serum with 48% gross margin can carry a different target than an electronics cable with 17% margin and higher returns. On bol, LVB costs, commission, return reserve and price position may change the safe ACOS again. On MediaMarkt, retail media can look efficient at account level while one low-margin accessory quietly burns the profit.
Ask the agency to show how they calculate break-even ACOS per SKU. If they cannot, your reporting will probably drift toward platform metrics. FiveX’s P&L and product profitability views are useful here because they connect ad spend, fees, fulfilment, returns and COGS before budget rules are agreed.
2. Marketplace mix discipline
Can the agency move spend between Amazon, bol and MediaMarkt based on profit capacity?
A pure Amazon agency may be excellent at Sponsored Products, Sponsored Brands, Sponsored Display and DSP. That is valuable. But many NL/BE brands do not win by optimizing Amazon in isolation. They win by deciding where the next €1,000 should go.
If Amazon.de has 21% TACoS, 8 weeks of stock and 7% contribution margin, while bol has 14% TACoS, 11 weeks of stock and 13% contribution margin, the right move may be to defend Amazon and grow bol. The agency must be comfortable with that trade-off. If every growth answer is “more Amazon spend”, they may be managing the platform they know rather than the profit you need.
3. Inventory-aware advertising
Can the agency reduce spend before a hero SKU runs out of stock?
Out-of-stock is where neat PPC management turns into marketplace damage. A campaign can hit target ACOS and still be wrong if it accelerates a SKU into a stockout that harms organic rank, Buy Box stability and customer trust.
For every hero SKU, the agency should know current stock cover, inbound timing, expected sales velocity and event risk. At FiveX, we like ad decisions to sit next to inventory insights for exactly this reason. It prevents the classic Friday surprise: “Great news, the campaign scaled. Small note, we have 9 days of stock left.” A tiny sentence. A large headache.
4. Campaign architecture by business role
Can the agency separate launch, defend, harvest, profit and test campaigns?
Not every campaign should be judged the same way. Launch campaigns may accept temporary loss to buy ranking signals. Defence campaigns protect branded demand. Harvest campaigns clear stock. Profit campaigns must stay inside strict margin limits. Test campaigns need capped budgets and clear learning goals.
If an agency reports all campaigns through the same ROAS lens, you will get messy decisions. Ask them to label campaigns by role and show different success metrics for each role.
5. Search term and placement governance
Can the agency prove how often they harvest, negate, split and cap search terms and placements?
Good PPC management is not only bid automation. It is hygiene. Search terms that spend without conversion need action. Branded terms should not be mixed with broad generic discovery. Product targeting needs SKU-level logic. Placement multipliers need margin context. Sponsored Brands should not get a budget just because the creative looks nice.
Ask for a decision log from the last 30 days. Not a dashboard. A log. What was changed, why, what data triggered it, and what happened next?
6. Incrementality maturity
Can the agency distinguish sales that ads caused from sales that ads merely claimed?
Amazon attribution can make a campaign look important because it captures demand that would have converted anyway. The same happens with branded search and remarketing. A mature agency will talk about TACoS, holdout tests, branded versus non-branded split, DSP incrementality, AMC where relevant, and category share. They will not pretend every attributed euro is new money.
7. Reporting that survives finance
Can the monthly report answer “did we make more contribution profit?”
A good report shows spend, sales, ACOS, TACoS and conversion. A better report adds contribution margin, stock risk, returns, fee impact, campaign role and next actions. The best report also says what the agency stopped doing because it was not profitable.
FiveX’s analytics layer is built for this kind of reporting: marketplace sales, advertising, inventory and profitability in one place. That gives agencies better raw material and brands a clearer way to challenge decisions.
8. Operating cadence
Can the agency run a weekly rhythm that creates decisions, not just updates?
For €5K+ monthly spend, a monthly performance call is usually too slow. The agency should have a weekly cadence: exceptions, budget moves, SKU margin risks, search-term actions, stock alerts and tests. The meeting should end with a decision list, owners and thresholds for the next week.
9. Commercial honesty
Can the agency say no to spend?
This sounds soft. It is not. The most valuable agency sentence is sometimes: “Do not increase budget on this SKU yet.” If your agency is paid as a percentage of spend, you need even stronger proof that they can recommend restraint. Commercial honesty is visible in how they talk about constraints: low stock, poor content, weak reviews, bad price position, thin margin, high returns and unrealistic launch targets.
10. Fit for your internal team
Will the agency complement the skills you already have?
If your team is strong in content and catalog operations, you may need a retail media specialist. If your team lacks marketplace operations, a full-service agency may be safer. If finance owns margin data but marketing owns ad accounts, you need an agency that can bridge both worlds. Do not buy the biggest scope. Buy the scope that removes your most expensive bottleneck.
Example 1: the Belgian homeware brand with a misleading Amazon win
A Belgian homeware brand spends €18,000 per month on Amazon.nl and Amazon.de and €7,000 on bol Sponsored Products. Their Amazon agency candidate shows a strong case study: ACOS reduced from 31% to 22% while ad sales grew 38%.
Good result? Maybe. The scorecard asks for margin.
- Amazon hero SKU: €39.95 selling price, €8.10 contribution margin before ads, safe ACOS around 20%.
- bol bundle SKU: €44.95 selling price, €13.40 contribution margin before ads, safe ACOS around 29%.
- Amazon stock cover: 5.5 weeks because replenishment is delayed.
- bol stock cover: 13 weeks with lower return rate.
The agency’s plan is to scale Amazon generic keywords because ACOS has improved. A profit-first agency would be more careful: protect branded Amazon terms, cap generic Amazon spend until stock is safe, and move €2,500 of test budget to bol bundles where margin and stock can carry growth. The top agency is not the one with the cleanest Amazon case study. It is the one that can see the cross-marketplace trade-off.
Example 2: the electronics seller where MediaMarkt changes the answer
An electronics seller spends €42,000 per month across Amazon, bol and MediaMarkt. Two agencies pitch. Agency A is an Amazon PPC specialist. Agency B has weaker Amazon branding but can report SKU contribution margin across all three marketplaces.
The seller’s numbers:
- USB-C hub on Amazon: 18% platform ACOS, but only €2.30 contribution profit per unit after ads and returns.
- Premium docking station on MediaMarkt: 24% platform ACOS, but €11.80 contribution profit per unit because basket value and return-adjusted margin are stronger.
- Replacement charger on bol: 12% ACOS, but stock cover is 10 days and inbound date is uncertain.
Agency A looks better if you only compare Amazon expertise. Agency B looks better if the goal is profit allocation. The right first 30-day plan is not “lower Amazon ACOS.” It is to cut low-incrementality USB-C queries, defend the bol charger without accelerating stockout, and give MediaMarkt docking stations a controlled €150/day scale test. That requires marketplace mix discipline, not just Amazon bid management.
Example 3: the supplement launch that needs a loss budget with a deadline
A Dutch supplements brand launches on Amazon.nl with €12,000 launch spend planned for the first month. The hero product sells for €29.95. Contribution margin before ads is €9.20. The agency proposes a 35% ACOS target during launch, even though break-even is roughly 31% before management fees.
That can be acceptable, but only if everyone names the loss. A mature agency would label the launch campaigns as investment mode, set a maximum planned loss of €1,800, define the ranking and review goals, and agree that by day 60 the SKU must move toward 24-26% ACOS or the structure changes.
An immature agency hides the loss inside optimistic words like “learning phase” and “velocity.” Learning is lovely. Unlimited learning is tuition without a graduation date.
The questions to ask on the discovery call
- Show me how you calculate break-even ACOS per SKU. If the answer is vague, stop.
- How do you decide whether budget should move from Amazon to bol or MediaMarkt? You want margin, stock and incrementality in the answer.
- Which campaigns are allowed to lose money, and for how long? Launch logic needs deadlines.
- What do you do when a campaign hits target ACOS but the SKU has 12 days of stock? The right answer includes budget caps or pausing.
- Can I see a 30-day decision log? Pretty reporting is not the same as operational discipline.
- Do you report platform ACOS, TACoS and contribution profit? Finance should not need a separate spreadsheet to understand marketing.
- How do you handle branded search incrementality? Mature agencies know that not all attributed branded sales are incremental.
- Who owns product feed, content and price issues that block advertising performance? Ads cannot fix a broken offer forever.
- When would you recommend reducing spend? If they cannot give examples, be careful.
- What does a good first 90 days look like? The answer should include audit, margin mapping, campaign restructuring, testing, reporting and governance.
A simple 90-day selection framework
Before signing a 12-month contract, define a 90-day operating test.
Days 1-15: margin and data audit
The agency maps SKUs, marketplaces, campaign structure, break-even ACOS, stock cover, returns and current search-term waste. FiveX can speed this up by bringing marketplace, advertising and profitability data into one cockpit instead of six exports.
Days 16-45: restructure and protect
Campaigns are labeled by role. Waste is cut. Branded and generic are separated. Budget caps are tied to SKU margin and stock. High-risk SKUs get stop rules. Reporting changes from “what happened?” to “what action did we take?”
Days 46-90: scale the right pockets
Only the products with enough margin, stock and evidence of incremental demand get more budget. This is where AI recommendations and automation can help: not by replacing the operator, but by surfacing anomalies, wasted spend and budget opportunities faster.
If the agency cannot improve decision quality in 90 days, a longer contract will not magically fix the operating model.
So, who is the top Amazon marketplace agency?
The honest answer: it depends on the job you need done.
If you are an enterprise brand expanding globally, a broad marketplace agency with retail media, content, operations and analytics depth may be right. If you already have a strong marketplace team and only need campaign execution, a focused PPC specialist may be better. If you sell across Amazon, bol and MediaMarkt with €5K+ monthly ad spend, the best partner is the one that can manage advertising against SKU margin, stock cover and marketplace profit capacity.
That is also how FiveX approaches Advertentie Service. The work is not “make ads look efficient.” The work is to decide which products deserve paid demand this week, which campaigns need guardrails, which marketplace should get the next euro, and where growth is actually worth buying.
Top agency lists can help you find names. The profit scorecard helps you choose the partner that will still look good after finance closes the month.