Global stocks have started the week mixed, with sentiment dampened by concerns about growth in China and the continuing political impasse in Italy.
At midday in New York, buyers stepped into the market to drive the Standard & Poor's 500 Index to an intraday record high. The S&P 500 was last up 0.21 per cent to 1,554.47, after earlier hitting a record 1,554.81.
The Dow Jones Industrial Average gained 0.29 per cent, after earlier climbing to a fresh high of 14,440.67, while the Nasdaq Composite Index eked out a 0.10 per cent gain.
Limiting the Nasdaq's advance was a drop in shares of Apple, last 0.9 per cent weaker at US$427.59 after earlier falling as low as US$425.14, after Credit Agricole cut the stock to "outperform".
"There are lots of investors out there looking for opportunities to put more money to work in equities," Tim Ghriskey, chief investment officer of Solaris Group, told Reuters, "and they're using these little pullbacks we've had - and there haven't been many - as purchasing opportunities."