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
    • ValidationCollection success, quality screens and backtests
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  • Solutions
  • Pricing
    • ResearchFindings tested against the shelf, and brand studies
    • BlogWhat the online shelf showed this month
    • GlossaryDefinitions of retail and alternative-data measures
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
Not sure what you need?Talk to the foundersClient login
  1. Home
  2. /Glossary
  3. /In-stock rate (availability)
Glossary

What is in-stock rate (availability)?

The percentage of a brand's or retailer's listed products that are available to buy.

Definition

In-stock rate is the share of listed products that can be purchased. Out-of-stock items remain listed but cannot be bought.

How Data Purl measures it

Data Purl records each SKU's availability flag every week and aggregates it by brand, retailer, category and size where available.

Why it matters

Falling in-stock rates at full price can signal strong demand or supply constraints. Rising in-stock rates alongside rising markdowns usually signal excess inventory.

Pitfalls

  • Some retailers hide out-of-stock items rather than flag them, so in-stock rates are most reliable when compared within the same retailer over time.

Related

Full-price availabilityAssortment count
  • Using markdowns as an early inventory and gross-margin signal

See the data for your coverage

Start free in the analytics portal, or talk to the founders about the full dataset delivered to Snowflake or S3.

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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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  • Build vs buy

Resources

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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.