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  3. /Active product (active assortment)
Glossary

What is active product (active assortment)?

A product that is listed on a covered retailer's website in the period, whether or not every size is in stock.

Definition

An active product is one Data Purl observes listed on a covered retailer's site during the period. Active assortment is the count of active products for a brand, retailer or category.

A product stays active while it is listed, even if some or all sizes are out of stock; it stops being active once it is no longer listed.

How Data Purl measures it

Active products are counted from weekly observations of each covered retailer and averaged over the period. First-seen and last-seen dates mark when a product enters and leaves the assortment.

Why it matters

Changes in active assortment show a brand widening or narrowing its range, or a retailer adding or dropping it, before that shows up in reported results.

Pitfalls

  • Assortment counts also move when retailers are added to or removed from coverage. Compare like-for-like retailers where possible.

Related

Assortment countNew-product share (new entrants)SKU

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Data Purl

Data Purl is an eCommerce pricing and assortment data provider that turns public retailer websites into investment-grade data: SKU-level price, discount, availability and assortment history across 400+ retailers back to 2013, with brands resolved to their owners, public or private, and listed owners mapped to tickers.

+44 20 8125 3010 (UK)+1 212-660-0780 (US / International)

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400+
retailers
1,900+
public companies mapped
4,000
product categories
2013
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© 2026 Data Purl. All rights reserved. Data Purl is a trading name of Cleveland Alternative Data Limited, a company registered in the United Kingdom with company number 16234509.