San Francisco-based indexing giant Barclays Global Investors filed with the SEC Friday to launch a new exchange traded fund for gold investors, to be called iShares COMEX Gold Trust. Pending regulatory approval, the ETF will be listed and traded on the American Stock Exchange under the symbol IAU, according to the filing. “The objective of the trust is for the value of the iShares to reflect, at any given time, the price of gold owned by the trust at that time, less the trust’s expenses and liabilities, “ the company said in its filing.