Walmart Marketplace said on November 5, 2026 that sellers can now choose Maximize conversion value or Target Return on Ad Spend (tROAS) when creating or updating Search Engine Marketing (SEM) campaigns. It also added optional automatic daily budget increases and category-based item selection. For a brand buying traffic to Walmart listings, the useful question is whether the new bidding objective matches the margin of the products in the campaign.
What the update changes
Walmart's SEM program promotes Marketplace listings through Google Shopping. The release note introduces two value-focused bidding strategies, a way to raise a daily budget automatically when the original budget runs out, and the ability to add campaign items by category as well as by SKU or name. These are campaign controls; Walmart has not published a universal ROAS outcome from using them.
Set a target from contribution, not a blended sales goal
Our recommendation is to group SKUs by economics before using tROAS. A high-margin replenishment item and a bulky low-margin item can produce the same reported ROAS with very different contribution. Start with item-level price, marketplace fees, fulfillment, returns and expected promotion cost. Use that calculation to define a test range for the campaign, then compare results by SKU rather than treating the account average as proof of profit.
Walmart's SEM performance report includes impressions, clicks, ad spend, sales and ROAS by day and item. Its documentation says attributed sales include promoted and non-promoted items bought within 14 days of an ad click. That attribution is useful for optimization, but it is not the same as item-level contribution after all costs. The current day's performance may also be incomplete, so judge a test over a stable window.
Keep the new budget control on a leash
An automatic budget increase can preserve campaign delivery when demand is strong, but it can also raise spend beyond an operator's planned daily cap. Before enabling it, set a spend ceiling in your internal plan and decide who reviews actual spend and billing. Select a small category or SKU set first, monitor item-level outcomes, and expand only if the results support it. This is Etail Rocket's test design, not a rule imposed by Walmart.
Practical next steps
- List the SEM campaigns where budget exhaustion or low-value traffic is a known issue.
- Separate candidate SKUs by contribution and inventory availability.
- Test one bidding change at a time and document the starting settings.
- Review item-level spend, sales and ROAS against your own margin model before scaling.
If you want an independent review of campaign economics and Walmart listings, ask Etail Rocket for a focused marketplace audit.