Data Purl
  • Platform
    • Coverage400+ retailers across the US, UK, Europe and Asia, history back to 2013
    • Shelf IndicesFree monthly price and discount indices by category and country
    • Brand headlinesQuarterly prices and markdowns for 84 consumer brands
    • Custom dataResearched extracts scoped to your sectors, brands and dates
    • MethodologyHow we collect, classify and map brands to 1,900+ listed companies
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Client loginStart free
  • Platform
    • Coverage400+ retailers, history back to 2013
    • Shelf IndicesFree monthly price and discount indices
    • Brand headlinesQuarterly prices for 84 consumer brands
    • Custom dataExtracts scoped to your sectors and dates
    • How we build it
      MethodologyHow we collect, classify and map brands
    • ValidationQuality screens and backtests
  • Solutions
  • Pricing
    • Research
    • Blog
    • Glossary
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  1. Home
  2. /Glossary
  3. /SKU
Glossary

What is SKU?

A single purchasable variant of a product, such as one size and color of a shoe, as a retailer lists it.

Definition

A SKU (stock keeping unit) is the most granular item a shopper can add to a basket: one size, color, pack size or configuration of a product. A style of sneaker offered in five sizes and two colors is one product and ten SKUs.

Data Purl records every SKU it observes weekly, and rolls SKUs up to products, brands, categories and companies.

How Data Purl measures it

SKUs are identified from each retailer's product pages and variant selectors, then grouped to their parent product. Availability and markdown are observed at SKU level, which is how measures such as in-stock rate and markdown breadth see individual sizes selling out or going on sale.

Why it matters

Size-level data shows what a product-level view hides: a style can look fully stocked while its core sizes are gone, or look full price while only the tail sizes are discounted.

Questions

What does SKU mean in retail data?

A SKU (stock keeping unit) is one purchasable variant of a product, such as one size and colour of a shoe. Retail data counts SKUs to measure availability and markdowns at the level shoppers actually buy.

Related

Active product (active assortment)In-stock rate (availability)Markdown breadth

See the data for your coverage

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Data Purl

Data Purl is an eCommerce pricing and assortment data provider that follows every brand across the retailers that sell it: SKU-level price, discount, availability and assortment history across 400+ retailers back to 2013, compared like for like, 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
history back to

© 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. Registered office: Basement, 52 Cleveland Square, London W2 6DB. Contact: support@data-purl.com.