Major U.S. stock-indexes lower on Monday morning as investors anxiously await the first U.S. presidential debate to gauge how the candidates plan to shape the economy and policy. While the White House race has so far had little discernible effect on the market, that may soon change as polls show a tightening race ahead of the first debate between Hillary Clinton and Donald Trump.

Almost all of Dow stocks in negative area (25 of 30). Top gainer - Apple Inc. (AAPL, +0.27%). Top loser - The Goldman Sachs Group, Inc. (GS -1.87%).

All S&P sectors also in negative area. Top loser - Healthcare (-1.1%).

At the moment:

Dow 18044.00 -146.00 -0.80%

S&P 500 2144.00 -14.00 -0.65%

Nasdaq 100 4821.25 -35.25 -0.73%

Oil 46.08 +1.60 +3.60%

Gold 1344.00 +2.30 +0.17%

U.S. 10yr 1.58 -0.04