Virtu Financial (VIRT) fell 7.5% after the company said the US Securities and Exchange Commission started a civil lawsuit over claims of "hypothetical internal access to data" but doesn't allege actual inappropriate access or use of data. The Philadelphia Housing Index was falling 1.4%, and the Real Estate Select Sector SPDR Fund (XLRE) was down 1.2%. In economic news, the seasonally adjusted consumer price index rose 0.6% in August, in line with a Bloomberg poll, and following a 0.2% gain in July, according to data released by the Bureau of Labor Statistics.