Major U.S. stock indexes slightly rose on Thursday as a rise in oil boosted energy shares, but gains on Nasdaq were limited as Tesla (TSLA) dragged. The electric carmaker's shares reversed premarket gains to trade down 3,4% after analysts expressed doubts about the company's ability to deliver vehicles ahead of schedule. Oil prices jumped about 2,5% as a huge wildfire in Canada's oil sands region and escalating tensions in Libya stoked concerns among investors of a near-term shortage in supply.

Most of Dow stocks in positive area (21 of 30). Top looser - Merck & Co. Inc. (MRK, -1,61%). Top gainer - International Business Machines Corporation (IBM, +1,55%).

Almost of S&P sectors in positive area. Top looser - Conglomerates (-1,9%). Top gainer - Basic Materials (+0,6%).

At the moment:

Dow 17620.00 +39.00 +0.22%

S&P 500 2049.75 +2.75 +0.13%

Nasdaq 100 4318.00 +8.25 +0.19%

Oil 44.78 +1.00 +2.28%

Gold 1277.00 +2.60 +0.20%

U.S. 10yr 1.77 -0.01