DTCC’s Security Master Files enrich a firm's own security master data, creating a reliable, golden source of data and ensuring on-time trade settlement. Firms can leverage trade processing efficiencies through this comprehensive, trusted data set, which describes more than 4 million active securities held at DTCC.
Documentation
Security Master File Data Service Premium Master File Service File User Guide

Security Master File Data - MMI Intraday Securities User Guide

Security Master File Data Service Premium Master File Service Sample Data

Security Master File Data Service MMI Intraday File Sample Data
