What does the NYSE Volume values represent? Why do they differ?
Cole Johnson May 08, 2009
$NYTV represents the total volume of "New York" shares traded on the NYSE's system in New York itself.
$NYA's volume value is the total volume of all "composite" shares traded in New York AND on the regional exchanges like Chicago, Philadelphia, Boston, etc.
$NYTV's value corresponds to the Volume data reported by the Wall Street Journal.
$NYA's volume value corresponds to the Volume data reported by the NYSE website.
The volume for $NYA should always be larger than $NYTV because it draws from a larger collection of stocks and exchanges.
$NYTV is reported in "millions of shares" while $NYA is reported in "individual shares".