Friday Sector Laggards: Oil & Gas Exploration & Production, Oil & Gas Refining & Marketing Stocks (6/17, 12:47 PM ET) -- In trading on Friday, oil & gas exploration & production shares were relative laggards, down on the day by about 5.9%. Helping drag down the group were shares of Houston American Energy, down about 10.7% and shares of Phx Minerals off about 10% on the day.

Also lagging the market Friday are oil & gas refining & marketing shares, down on the day by about 3.7% as a group, led down by Vertex Energy, trading lower by about 12.3% and Calumet Specialty Products Partners, trading lower by about 8%.

For MarketNewsVideo.com, I'm Sayoko Murase.