Abstract: An inventive fundamental investor natural demand matching engine is disclosed. An electronic processer linked to a network, receives an indication of interest (IOI) specifying a security, a trade direction and an amount. The system attempts to pair the IOI with any previously received contra-indications of interest (c-IOI), i.e., interest in the same security but in the opposite trading direction. If matched then execute a trade. If the IOI is partially, or not, filled, possible interested counterparties are found using data gathered automatically from public records. The identity and estimated trade size of the potential counterparties are transmitted to the IOI submitting party. If interested in any potential counterparties, the submitting party authorizes sending an anonymous extended indication of interest (e-IOI) to them. If the potential counterparty is interested, a mediated negotiation occurs and if successful, a trade.