ALT5 Sigma is a small B2B fintech company that provides digital asset infrastructure for institutional and professional customers including banks, broker-dealers, funds, family offices, and merchants across roughly 50 countries. Its core products are three platforms: ALT5 Prime, an OTC trading platform where institutional clients buy and sell Bitcoin, Ethereum, and 40+ other cryptocurrencies against fiat currencies via browser, mobile, or API integrations including a FIX API and Broadridge's NYFIX gateway; ALT5 Pay, a crypto payment gateway for merchants that supports optional auto-conversion to fiat; and StrataCarte, a multi-currency physical and virtual Visa and Mastercard card platform acquired in May 2025 that allows users to spend both fiat and digital currencies. ALT5 Sigma generates revenue through one-time setup fees, recurring monthly maintenance fees, and transaction fees ranging from 0.25% to 5% per trade or payment, so revenue scales with platform volume. The business is asset-light, acting as a software and platform provider rather than a market-maker or custodian. ALT5 Sigma's growth strategy focuses on targeting FINRA-registered broker-dealers as a distribution channel, geographic expansion into Europe and Asia, reseller partnerships, and selective acquisitions. The company also holds clinical-stage biopharmaceutical assets through a subsidiary called Alyea Therapeutics, though these are classified as discontinued operations and intended for spin-off.