We promised this one in the Q1 tools teardown. Same methodology, top 50 brands by GMV through March 31, 2026, our index plus Helium 10, different category. Home & kitchen, by the numbers, looks healthy. Look closer and the foundation is moving.
Headline numbers
- Category GMV up 4.1% YoY (US), the slowest growth since 2019
- Top 10 brand concentration: 38.6% (down from 42.4% in Q4)
- Median TACoS across the top 50: 11.3% (up from 9.6%)
- Private label share up 340 bps, the largest single-quarter move we’ve ever logged in housewares
- Median Sponsored Brands video CTR fell 11% across the top 50, every brand we tracked lost CTR on the same creative
What’s actually happening
The headline growth is misleading. Strip out three SKUs (two coffee subcategories and one cookware brand running aggressive promotions), and the rest of the top 50 grew 0.8%. That’s a category whose top-line number is being carried by a handful of price-led plays.
Drill one level deeper and it gets stranger. Coffee makers grew 9.1%. Knives grew 6.4%. Cookware sets, the historically reliable anchor of the category, grew 0.3%. Bakeware is flat. Dinnerware contracted 1.8%. The growth is concentrated in the two subcategories where price-led private label hasn’t caught up, and absent everywhere else. If your brand is in cookware, bakeware, or dinnerware, you didn’t have a flat quarter. You had a quarter where the floor moved under you.
Meanwhile, Cosmo’s reranking has gotten very confident in housewares, query rewrites for “kitchen shears” and “knife sharpener” now route 18% of impressions to listings that didn’t even appear in those search terms a year ago. We tracked twelve of those queries from Q4 to Q1; in eight of them, the top-3 organic positions changed completely. The brands losing share weren’t undercut on price. They were rerouted out of relevance. That’s exactly the failure mode our Cosmo-aware A+ rebuild is built to prevent.
What the share-gainers are doing
Two patterns explain ~80% of the brands gaining share against the trend in Q1:
1. Catalog rebuilds completed in Q3-Q4 2025. The brands now climbing aren’t doing anything special this quarter, they did the work last year. Specifically: detail-page copy rewritten for semantic match, A+ modules sequenced for the Cosmo-aware order (problem-statement first, lifestyle stripped if not pulling its weight, FAQ inserted), and review velocity managed actively. Six of the top-15 share-gainers we tracked completed visible catalog rebuilds between September and December. The ones still rebuilding now are six months behind.
2. SB video refreshed in the last 90 days. The CTR collapse isn’t universal, the brands holding their CTR are the ones who replaced their SB video creative in February. Same hook structure as 2024 doesn’t work in 2026; the algorithm’s treatment of repetitive creative has tightened. We’re seeing a 0.8% CTR floor on stale SB video and a 1.4-1.6% floor on creative under 90 days old. That’s not a small gap.
Three winners that weren’t (housewares edition)
Same pattern as the tools category: three top-10 brands “won” Q1 by sales rank and lost on the P&L.
The first bought rank with a 22% sitewide promo from January 14 through March 8. Volume up 31%. Margin contribution down to ~3% on those units. Their year is now mathematically about whether they can hold rank at full price in Q2, which they probably can’t.
The second scaled DSP to defend an organic-share collapse and is now spending $0.42 per dollar of incremental revenue. Their CFO is going to find out in the May board pack. We’ve seen this play out twice in the last 18 months; in both cases, the DSP scaling masked the catalog problem rather than fixing it. The catalog problem doesn’t go away when you stop spending. It just shows up immediately.
The third is the one to watch, they’ve been quietly buying their share back since November and the bps math we ran suggests they’re now structurally negative. Their TACoS is up 380 bps over six months while organic share is flat. That’s not stabilization. That’s a brand spending money to stand still, which is a different problem and a worse one.
What we’d watch in your data
Three things, roughly in priority:
First: split your top-10 SKUs by share-of-impression on their core query. If any have lost more than 8 points of impression-share quarter-over-quarter, that’s a Cosmo-rerouting signal, not a price problem. Don’t fix it with a bid increase.
Second: pull your last six A+ edits and ask when they shipped. If the answer is “I don’t know” or “we haven’t touched it since launch,” that’s a catalog-as-product problem, and the brands gaining share have already moved past it. The brands compounding in 2026 are treating their catalog like software: versioned, instrumented, edited weekly.
Third: pull your SB video CTR by creative age. If your top-spending video is older than 90 days and CTR is below 1.0%, you’re in the bottom band of the category, and the bid you’re paying isn’t the lever. The creative is.
What we’re watching in Q2
Private label going up 340 bps in one quarter is the signal. Generic challengers don’t usually get that much attention from Cosmo without a creative or query event upstream. The brands gaining share aren’t necessarily the ones with the best products, they’re the ones treating their catalog like a software product: versioned, instrumented, edited weekly. We have hypotheses about what changed in February.
Subscribe to the Operator Brief, Q2 home & kitchen update lands August 7.