Here’s a concise write-up on (Transaction Products & Repo Index), focusing on its role, mechanics, and significance in fixed-income and derivative markets. Understanding Tango TPRI: A Benchmark for Repo and Collateral Markets Tango TPRI (often referenced in European fixed-income analytics) is a specialized index designed to track the general collateral (GC) repurchase agreement (repo) rates for specific baskets of high-quality liquid assets (HQLA), primarily euro-denominated government bonds.