The bidding that involves an offer to buy a basket of stocks where the potential buyer does not know the component stocks. Blind bid transactions/ trades are usually sought by investment managers who targets a uniform price for their stock investments, and as a result can also eliminate a portion of market risk. The market risk in this particular context may result from the negative impact of a specific trade on the market prices of stock being sold or bought (sell orders/ buy orders) as part of investment/ portfolio management.