The CCO is the top customer-facing executive in many SaaS companies. Often reports to the CEO directly, sometimes to the CRO. Responsible for retention, expansion, NPS, customer health, and the post-sales motion. Whether a company has a named CCO (vs subsuming CS under sales/ops) is a meaningful structural signal - companies with public CCOs tend to disclose retention metrics more often and tie CCO comp to NRR.
See how public B2B SaaS companies disclose this metric, with full historical time series.