Updated from 12:17 p.m. EDT with new stock prices. Energy-related exchange-traded funds were the best performers of Monday's session, as oil prices rose past $85 a barrel for the first time ever. Crude has already been hovering around its all-time high, and news of tensions between Turkey and Kurdish rebels in northern Iraq has been supporting prices in recent days. Oil was jumping $1.45 to $85.14 a barrel. The Ultra Oil & Gas ProShares ( DIG) added $2.65, or 2.26%, to $119.97. The United States Oil ( USO) was gaining $1.93, or 2.98%, to $65.93. The iPath S&P GSCI Crude Oil Index ( OIL) was up $1.41, or 2.98%, to $48.77. The United States Natural Gas ( UNG) ETF was also advancing as natural gas prices jumped 35 cents to $7.32 per million British thermal units. Recently, the ETF was up $2.54, or 6.52%, to $41.45. Not surprisingly, homebuilders were among the worst decliners to start the week. Among individual names, Hovnanian ( HOV), Toll Brothers ( TOL), Beazer Homes ( BZH), Ryland ( RYL), D.R. Horton ( DHI) and Standard Pacific ( SPF) dropped at least 2.5% each. The SPDR S&P Homebuilders ( XHB) was losing 81 cents, or 3.52%, to $22.18. The iShares Dow Jones U.S. Home Construction ( ITB) slid 87 cents, or 4.01%, to $20.85. Bundled securities tracking financials were also under pressure following a weak earnings report from Citigroup ( C). Despite tempering expectations two weeks ago with an earnings preannouncement, Citi was still a drag on the financial sector after it said third-quarter earnings were down 57% from a year ago. Shares of Citi were down 3.41%.