Brokerage firms and fintech innovators face a significant decision between using an omnibus account structure, which offers flexibility but requires complex engineering and operations, and a fully disclosed account structure, which is simpler but less adaptable. Alpaca introduces a solution called OmniSub, which combines the benefits of both models by providing a technology layer that adds a reliable operational framework to the omnibus account structure. This allows firms to manage complexity while maintaining the privacy and operational advantages of an omnibus model. OmniSub offers real-time visibility and control over sub-accounts, simplifying tasks such as reconciliation, corporate actions, and trade matching. Alpaca, a self-clearing broker-dealer, supports this service through its technology offering, providing an efficient brokerage infrastructure for various securities and cryptocurrency trading. The solution aims to minimize the operational burden on partners, allowing them to focus on business growth rather than intricate bookkeeping and compliance challenges.