Settlement Systems
Comprehensive guide to securities settlement with Python implementations for DVP analysis, fail management, and settlement optimization
Settlement Systems
Executive Summary
Settlement systems are the critical infrastructure enabling the final transfer of securities and cash following trading. With global securities markets holding over $100 trillion in assets, efficient and safe settlement is essential for market functioning. Settlement risk—the possibility that one party delivers while the other defaults—was historically a major source of systemic risk before the adoption of delivery-versus-payment mechanisms.
The post-trade landscape has evolved significantly with the move from T+3 to T+2 and now T+1 settlement in major markets. The US transition to T+1 in May 2024 compressed settlement timelines dramatically, requiring same-day trade affirmation and creating operational challenges for global participants, particularly those managing FX funding across time zones. For treasurers and operations teams, this shift has made settlement a strategic concern rather than a back-office afterthought: fail rates, liquidity timing, and CSDR penalties now feed directly into P&L and regulatory capital.