Major U.S. stock-indexes little changed on Wednesday as health stocks weighed and financials fell after Federal Reserve Chair Janet Yellen said the central bank was considering changes to the annual stress test. Yellen said the Fed was looking at a more risk-sensitive, firm-specific approach to the test that would raise capital requirements for big U.S. banks based on their test results. Healthcare sector weighed the most on the benchmark S&P 500 index as Bristol-Myers and Amgen fell.

Dow stocks mixed (17 in negative area, 13 in positive area). Top gainer - Caterpillar Inc. (CAT, +2.18%). Top loser - NIKE, Inc. (NKE, -1.87%).

S&P sectors also mixed. Top gainer - Basic Materials (+1.0%). Top loser - Healthcare (-0.5%).

At the moment:

Dow 18137.00 -2.00 -0.01%

S&P 500 2150.50 -2.25 -0.10%

Nasdaq 100 4857.50 -3.25 -0.07%

Oil 45.82 +1.15 +2.57%

Gold 1323.90 -6.50 -0.49%

U.S. 10yr 1.54 -0.01