Revenge of the Reverse Leveraged ETFs

QuantGuy emails:

Subject: Failure of the reverse leveraged ETFs

Today represented the anomaly that has been in the news lately about the inverse leveraged ETFs:

S&P down 0.06%
SDS down 0.05%

not only wasn't it doubled, it went in the same direction.

SDS is one such ETF ("UltraShort S&P500 ProShares") that is intended to protect against downside risk -- in this case against a daily drop in the S&P 500.

Looks like the fund designers need to go back to the drawing board.