Insider trading is the buying or selling of any publicly traded company's stock and this can be done by someone who has non-public, material information about that RIO. Insider trading can be illegal or legal depending on when the insider makes the trade. It is illegal when the material information is still non-public. Institutional transactions is the amount of a Rio Tinto Group (NYSE:RIO)'s available stock owned by mutual or pension funds, insurance companies, investment firms, private foundations, endowments or other large entities that actually manage the funds on the behalf of others, so its an interesting element for the traders to note it, and the Institutional ownership for the RIO is 6.80%. A Basic Materials sector firm, Rio Tinto Group (NYSE:RIO) stock advanced 1.51% on Tuesday and when day-trade ended the stock finally concluded at $63.73 and number of shares that changed hands during the day are 3.02 Million.