Rest of Search (ROS)
Rest of Search is the placement bucket covering paid positions below Top of Search — the interleaved sponsored placements scattered through the organic rows and the bottom-of-search row before pagination. Cheaper than TOS per click; usually meaningfully less efficient per sale.
Rest of Search (ROS) is Amazon's placement classification for paid Sponsored Products positions that appear on the search results page but not in the first row. ROS includes the mid-page sponsored rows interleaved with organic results and the bottom-of-search row before pagination.
ROS vs. TOS economics
| Dimension | Top of Search | Rest of Search |
|---|---|---|
| CTR (typical) | 0.6–1.4% | 0.2–0.5% |
| CVR (typical) | 1.3–1.8× ROS | baseline |
| CPC | 1.5–3× ROS | baseline |
| Impression supply | Limited (1 row × N keywords) | Abundant |
| Competitive intensity | Highest | Moderate |
A campaign with no TOS modifier will, by default, accumulate most of its impressions in ROS because ROS has far more impression supply. This is not a sign the campaign is performing well — it is a sign the auction allocated you the cheaper, less-converting placement.
When ROS is the right placement to lean into
Not every keyword should be defended at TOS. ROS-heavy campaigns make sense for:
- Discovery campaigns (broad-match and auto) where the goal is to surface new search terms cheaply, not convert at the highest rate.
- Low-margin SKUs where TOS CPC math doesn't work but ROS CPC math does.
- Long-tail keywords with limited TOS supply anyway — the auction often doesn't materially differ between TOS and ROS for terms with 50 weekly searches.
Reading ROS performance
The standard campaign report mixes TOS and ROS performance into one row. The Placement Report in the Ads Console (or via the Ads API) breaks the data into:
- Top of Search (first page)
- Rest of Search
- Product Pages (PDP placements)
Pulling the Placement Report weekly is the only way to make defensible placement-modifier decisions.
Common mistakes
- Confusing "high ROS impression count" with "winning the keyword." You're winning the cheap auction, not the valuable one.
- Bidding ROS up to chase TOS volume. ROS bid increases buy more ROS, not more TOS — TOS requires the TOS modifier.
- Treating product-page placements as ROS. They are a separate placement category with their own bid modifier and economics.