You can read about this fund at http://www.proshares.com/funds/uvxy.html . It is priced similar to VXX and VIXY. All three are based on a mixture of the two front month VIX futures contracts.Quote from tracer619:
I do not know how its computed. Yesterday the VIX was up slightly while UVXY was down about a point.
Why the difference yesterday?
How exactly is it computed?
The VIX futures contracts are priced at what traders think VIX will be on the day they expire. They are somewhat affected by the change in the spot VIX, but usually move more slowly than it and sometimes move in the opposite direction.
There is no investment vehicle that directly tracks the VIX, just futures, options, and ETFs and ETNs like VXX and UVXY.
These funds continually sell the front month futures and buy the 2nd month futures. Since over 90% of the time the 2nd month futures cost more than the front month futures, these funds typically have a built in decay of 5 to 10% per month. Quite often, they lose value even on days when the market goes down.