what is up volume 
 up volume generally refers to an increase in the volume of shares traded in either a market or security that leads to an increase in value up volume can be contrasted with down volume understanding up volumeup volume occurs in bullish markets when security prices are rising with increased volume in the market up volume may also be referred to as up on volume overall volume can be influenced by a number of factors and may have various effects on an up volume trading day an index s value would trade higher in conjunction with an increase in its trading volume the same concept occurs in a single security for example an up volume stock day for a single stock would show a price trading higher and ultimately closing higher than the previous day s close volume is the total number of shares that are transacted volume can be influenced by a number of factors and is typically higher following the release of public information about a security noise traders tend to be significant contributors to high volume trades for example a company s stock may be rising on a release of good news if the news was unanticipated it can boost trading from both institutional and retail investors as the price gains noise traders will contribute to high volume trading days since they follow trends and trade heavily on sentiment most technical analysts and institutional investors when watching a stock for possible investment will follow its volume a spike in volume is typically caused by a significant market catalyst that merits attention many technical analysts believe that volume can also be a signal of a price breakout in a bullish or bearish direction pvi and nvithe positive and negative volume indexes pvi and nvi were first developed by paul dysart in the 1930s to help investors discern some of the effects of market trading volume pvi and nvi then became more popular in the 1970s after the calculations were expanded to individual securities pvi if current volume is greater than the previous day s volume pvi previous pvi today s closing price yesterday s closing price yesterday s closing price x previous pvi if current volume is lower than the previous day s volume pvi is unchanged nvi if current volume is less than the previous day s volume nvi previous nvi today s closing price yesterday s closing price yesterday s closing price x previous nvi if current volume is higher than the previous day s volume nvi is unchanged these index values provide insight on how prices are fluctuating with trading volume in an up volume trend pvi would trend higher as volume increased thus investors seeking to profit on bullish up volume trading could use the pvi as one indicator for potential price signals 