A customer cohort chart, also called a C3, tracks revenue by acquisition cohort over time. It shows how total customer spending changes as each cohort ages. A C3, along with the number of active customers and the total number of orders, can provide a good understanding of customer behavior. Increasingly, subscription and non-subscription companies disclose their C3. However, C3s are mostly likely to be included by IPOs in their S-1 filings.