Brand Partner Index.

Brand Partner Index is an independent quarterly research publication that tracks how European fashion brands experience the major e-commerce platforms — Zalando, ASOS, About You, Amazon Fashion, Zalando Lounge, and their peers. Each issue aggregates structured interviews with brand owners, merchandisers, and platform-channel managers into a single public benchmark: what is getting better, what is getting worse, and where capital is moving.

The Index is not affiliated with any platform, marketplace, or retail group. It exists to give brand owners, investors, and operators a shared vocabulary for a market whose internal dynamics are otherwise opaque — a supply-side view of a demand-side business.

1. i.

   Structured interviews

   Each issue is built from a panel of conversations with European fashion brand owners and platform-channel managers, conducted by telephone and drawn from across the Zalando partner universe and adjacent marketplaces.

2. ii.

   Eight-question instrument

   A consistent eight-question survey — covering relative satisfaction, trajectory, forward commitment, peer recommendation, and five-year platform outlook — administered to every participant, identical across quarters to enable longitudinal comparison.

3. iii.

   Aggregate reporting

   No individual brand is ever identified. Every published figure represents a minimum of twenty respondents. Quotes are reproduced only with explicit consent and never attributed.

4. iv.

   Quarterly cadence

   Results are published four times yearly. Each issue carries the full methodology, sample composition, and margin of error. Participating brands receive the aggregated index at no cost.

Brand Partner Index is voluntary and confidential. Participation takes approximately eight minutes by telephone and contributes to a benchmark that is shared back with every contributor at publication.

Brands are not compensated. The Index is not a lead-generation tool and no individual response is shared with any platform, retailer, or third party. The research conversation is conducted by a trained interviewer with the assistance of an AI note-taking system; respondents are informed at the outset.

No individual brand is ever identified. Every published figure represents a minimum of twenty respondents, and direct quotes are reproduced only with explicit consent.

The full methodology — scope, instrument, confidentiality rules, and sample construction — is published as a standing document at brandpartnerindex.com/methodology.