Using custodial assets for arbitrage requires rigorous due diligence because custodians hold funds under fiduciary duty and must prioritize client interests. Before executing any arbitrage strategy with custodial funds, verify legal authority, client consent, and regulatory compliance. Regulators emphasize clear segregation and permissible uses of custody assets. The Comptroller's Handbook Office of the Comptroller of the Currency outlines custody procedures emphasizing segregation of client property to prevent misuse. The Division of Trading and Markets Securities and Exchange Commission highlights the importance of disclosure and accurate recordkeeping to demonstrate that customer assets are not impermissibly commingled.
Legal and regulatory checks
Confirm that contracts, custodial agreements, and power-of-attorney documents explicitly authorize the proposed arbitrage activity and that authorization is informed and documented. Review applicable law for the relevant territory, since rules differ by jurisdiction and by client type; what’s allowed for institutional mandates in one country may be prohibited for retail accounts in another. Assess licensing and registration requirements for the custodian and any trading counterparties. FINRA staff Financial Industry Regulatory Authority guidance and SEC materials set standards for permissible proprietary use of customer holdings and for mitigating conflicts of interest.
Operational and risk controls
Conduct counterparty due diligence, stress-test the arbitrage strategy under market dislocations, and quantify liquidity, market, and settlement risks. Ensure real-time reconciliation and independent custody verification to maintain segregation of assets. Implement hard limits and escalation protocols so that a single failed trade cannot impair client principal. Maintain written policies on margin use, rehypothecation, and collateral substitution; document approvals and contemporaneous client communications to evidence that actions were prudent and within mandate.
Assess reputational and human factors: explain the strategy in plain language to clients and obtain explicit consent where risk profiles change. Cultural norms around disclosure and client expectations vary by region, and failure to align with those expectations can produce regulatory scrutiny or client litigation even when transactions technically comply. Finally, maintain comprehensive audit trails and periodic external review to show adherence to policies. Robust documentation and independent oversight transform a risky practice into a defensible one when regulators or clients question the use of custodial funds for arbitrage.