The "should I be on Walmart?" question used to be simple. Amazon was 90% of the ecommerce conversation for CPG brands. Walmart Marketplace was an afterthought — too small, too clunky, too locked behind approval gates. That was 2022. In 2026, Walmart Marketplace is growing at 22% year-over-year, grocery and pet and wellness categories are compounding at 30%+, and the average cost-per-click on Walmart Connect is running 30-50% below Amazon Advertising for comparable placements. The question is no longer whether to sell on Walmart. It's how to allocate resources between two platforms that serve different buyers, operate different economics, and ride different growth curves.
Walmart Marketplace and Amazon serve overlapping but structurally different buyer populations. Amazon captures roughly 40% of US ecommerce with a search-first, Prime-driven model. Walmart Marketplace holds approximately 7% and growing, with a grocery-anchored, value-oriented buyer base that over-indexes for CPG categories like pet, wellness, pantry, and household. The decision between them is not either/or. It's a portfolio allocation question.
This piece runs the comparison across eight operational dimensions using what I'm calling the 2026 Channel Fit Matrix. No gut calls. No "it depends." Each dimension gets numbers, and the matrix produces a category-specific recommendation for CPG brands evaluating where to concentrate — or how to run both.
How big is Walmart Marketplace compared to Amazon in 2026?
Scale matters because it determines the ceiling on any given channel. Here's where the two platforms sit:
Amazon US: ~40% of all US ecommerce. Over 310 million active customer accounts. Prime membership exceeds 200 million globally. The platform is mature, competitive, and expensive to win on — but the volume is unmatched.
Walmart Marketplace: ~7% of US ecommerce and growing at 22% year-over-year. Over 120 million monthly unique visitors. Walmart's total ecommerce revenue (including grocery pickup and delivery) exceeded $100 billion in 2025. The third-party marketplace is the fastest-growing segment within that number.
The gap is still massive in absolute terms. But the growth differential matters for CPG brands specifically. Walmart's CPG-adjacent categories — grocery, pet, health and wellness, household essentials — are compounding at 30%+ year-over-year on the marketplace. These are categories where Walmart's in-store brand equity translates directly to online buyer intent. A CPG brand in pet food or vitamins has a structurally different opportunity on Walmart than a CPG brand in premium skincare.
The system-level insight: Amazon is the volume play. Walmart is the margin and growth-rate play. Both belong in a CPG brand's channel portfolio. The allocation depends on category.
How do fees and fulfillment compare between the two platforms?
Fees and fulfillment are where most brands start the comparison — and where the nuance lives.
Referral fees: Both platforms charge 8-15% depending on category. The ranges overlap almost perfectly, so referral fees alone don't differentiate. Look at the specific category rate for your products.
Fulfillment costs: This is where the gap opens.
Dimension | Amazon FBA | Walmart Fulfillment Services (WFS) |
|---|---|---|
Per-unit fulfillment cost (standard CPG) | $3.50-$6.00 | $2.80-$4.80 |
Storage fees (per cubic ft/month) | $0.78-$2.40 (seasonal) | $0.75 flat |
Long-term storage surcharges | Aggressive (365+ days) | Moderate |
2-day delivery coverage | 95%+ (US) | 80-85% (US) |
Returns processing | Included in FBA fee | Included in WFS fee |
Walmart Fulfillment Services is roughly 20% cheaper per unit than FBA for equivalent SKUs. The trade-off: WFS's delivery coverage is narrower. Amazon's 110+ fulfillment centers deliver 2-day to 95%+ of the US. WFS covers 80-85% within that window.
For a CPG brand optimizing on unit economics, WFS wins. For a brand optimizing on delivery speed and customer experience, FBA wins. For a brand running both channels, MCF from the FBA pool can fulfill Walmart orders at FBA-level speed — which eliminates the WFS delivery gap while using a single inventory pool.
How does Walmart Connect compare to Amazon Advertising for CPG?
Advertising cost is the single biggest operational difference between the two platforms in 2026.
Amazon Advertising is mature, competitive, and expensive. Average CPCs for CPG categories range from $1.20-$3.50 depending on subcategory. Competitive terms in vitamins or pet food routinely hit $3.00+. Full-funnel capability — Sponsored Products, Sponsored Brands, Sponsored Display, DSP — but the cost reflects the competition.
Walmart Connect CPCs are typically 30-50% below Amazon for comparable placements. A term that costs $2.50 on Amazon might run $1.25-$1.75 on Walmart. The mechanism is straightforward: fewer advertisers competing for the same placements. As Walmart grows and attracts more sellers, that gap will narrow. In 2026, CPG brands on Walmart Connect are buying audience at a discount — the same dynamic Amazon advertisers benefited from in 2016-2018.
The trade-off: Walmart Connect's reporting and attribution tools are less mature. Bid optimization is more manual. The creative formats are simpler. If your team can operate with less automation, the lower CPCs more than compensate.
What is the 2026 Channel Fit Matrix — and where does your category land?
The 2026 Channel Fit Matrix scores Walmart and Amazon across eight operational dimensions, weighted for CPG relevance. Here's the matrix:
Dimension | Amazon | Walmart | Which wins for CPG |
|---|---|---|---|
Reach (monthly uniques) | 310M+ | 120M+ | Amazon |
Referral fees | 8-15% | 8-15% | Tie |
Fulfillment cost per unit | $3.50-$6.00 | $2.80-$4.80 | Walmart |
Advertising CPC | $1.20-$3.50 | $0.60-$1.75 | Walmart |
Buyer intent (CPG categories) | High (search-first) | High (grocery-anchored) | Category-dependent |
Buy box mechanics | Complex (multiple sellers) | Simpler (fewer competitors) | Walmart |
Brand protection tools | Mature (Brand Registry, Transparency) | Developing | Amazon |
MCF cross-fulfillment | Native (MCF from FBA pool) | Available via MCF | Amazon |
Where each channel wins by CPG subcategory:
Grocery, pantry, household: Walmart's grocery buyer base over-indexes for these categories. Walmart wins on buyer intent and cost.
Pet food and treats: Both platforms are strong. Run both — Walmart for margin, Amazon for volume.
Vitamins, supplements, wellness: Amazon's search-first model captures the research buyer. Amazon wins but Walmart is compounding.
Beauty and personal care: Amazon's scale dominates, but Walmart's mass-market beauty buyer is growing 25%+ YoY.
Premium and specialty CPG: Amazon wins. Walmart's buyer base skews value-oriented.
The matrix doesn't produce a single answer. It produces an allocation. Most CPG brands in 2026 should be on both platforms. The question is where to spend the next dollar of ad budget and the next hour of operational attention.
The Neato point of view
Neato operates both Amazon and Walmart as part of our omnichannel 2P model. We buy inventory at wholesale, sell across both platforms, and fulfill Walmart orders from the same Amazon FBA inventory pool via MCF when speed matters more than WFS cost savings.
The reason the 2026 Channel Fit Matrix matters: most 2P operators are Amazon-only. They can tell you how to win on Amazon. They can't tell you how to allocate across Amazon and Walmart because they don't operate both. The brands we work with run a single demand forecast, a single inventory pool, and a single advertising strategy across channels — with the allocation shifting as the competitive dynamics on each platform shift.
The worst version of the Walmart vs. Amazon question is treating it as a binary. The best version is treating it as a portfolio — and having the operational infrastructure to run both from one model.
