BOSCH LTD Open Interest is the number of outstanding contracts. It is used as an indicator of how much market participants are interested in holding BOSCH LTD Option contracts. BOSCHLTD Open interest is to look at it relative to the volume of contracts traded. When the volume exceeds the existing open interest on a given day, it suggests that trading in that option was exceptionally high that day. Open interest also gives you key information regarding the liquidity of an option.