Portfolio Investment Scheme (PIS) is a scheme of the Reserve Bank of India (RBI) laid down in Schedule 3 of the Foreign Exchange Management (Transfer or Issue of Security by a Person Resident Outside India) Regulations, 2000 under which the Non Resident Indians (NRIs) and Person of Indian Origin (PIOs) can purchase and sell shares and convertible debentures of Indian Companies on a recognized stock exchange in India by routing all such purchase/sale transactions through their account held with a Designated Bank Branch.