I can tell you that with respect to "benchmark index", USO (2X long) and SCO (2X short) appear to be in EXACTLY PERFECT balance (-5.46% and +5.38% respectively).
However--DJAIGCL index is down about 4%.....so moves in BOTH UCO and SCO should be greater.
I SUSPECT has to do with fact that today (Friday) is "5th and FINAL day" of the "monthly roll" to next month's contracts:
"ProShares Ultra DJ-AIG Crude Oil seeks daily investment results, before fees and expenses, that correspond to twice (200%) the daily performance of the Dow Jones—AIG Crude Oil Sub-Index. The Index consists of futures contracts on crude oil only.
The DJ—AIGCI rolls its contracts over the course of 5 consecutive business days, starting on the 6th business day of the month. Each day, 20% of each futures position that is included in the month’s roll is rolled. Not all contracts are rolled every month."
I'll try to do some calculations later.
--ChartReader
--ChartReader
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