The Dow Jones industrial average was down 20 points at 14,953 points at noon (1600 GMT) Monday, a decline of 0.1 per cent.
The Standard & Poor's 500 rose one point to 1,616. The Nasdaq composite edged up seven points to 3,384, an increase of 0.2 per cent.
Tyson Foods, the nation's largest meat-processing company, fell 4 per cent after reporting that its income dropped as chicken feed costs rose and profits fell in its beef business.
The stock market cleared new milestones Friday after the government reported that employers added more workers to their payrolls in recent months.
The Dow rose above 15,000 for the first time, while the S&P 500 closed above 1,600, another first.