2026 Financial Market Data
Audit Trends.

At a glance

• ~40%

  Audit increase

  Estimated surge in market-data vendor, stock-exchange, and index-provider audit activity in 2025. Paraxis practitioner caseload, cross-referenced with FISD and IPUG member reporting.

• 5+ yrs

  Lookback period

  Record-retention expectations in major exchange audit programs.

• 1.5%/mo

  Interest rate

  Monthly interest on under-reporting adjustments under common addenda.

Audits are no longer an occasional distraction.

Market data audits — including reference data and indexes — are becoming a standing operating condition. In 2025, market data vendor, stock exchange and index audit activity jumped an estimated 40% (Paraxis practitioner caseload, cross-referenced with FISD and IPUG member reporting). That surge was not random. It reflects a structural shift in how exchanges, index providers and vendors protect revenue, enforce licensing and adapt to modern distribution models — cloud, APIs, managed services, internal platforms, non-display use, and new original works including derived workflows.

At a high level, a market data audit is an end-to-end test of whether a firm’s actual consumption and distribution of market data matches what it contracted and paid for — down to the user and device count, server-to-server flows, and whether data lands anywhere outside licensed scope.

What the paper covers

• Why vendor and exchange audits have shifted from occasional distraction to a standing operating condition.
• How modern distribution (cloud, APIs, managed services, non-display use) is reshaping audit triggers.
• The combination of broader scope, remote-first audits, and 5+ year lookback periods.
• A pragmatic preparation playbook that reduces audit duration, limits liability, and prevents repeat findings.
• What audit-ready operations look like — and the steps to get there before the next letter arrives.