USA stocks spent a second day flipping between small gains and losses Thursday as investors again looked for hints about the Trump administration's stance on worldwide trade and the dollar.
The dollar strengthened after Pres. Trump said Wednesday's comments from Treasury Secretary Mnuchin - who said he welcomed a weaker dollar - were taken out of context and clarified that his administration ultimately wants to see a stronger dollar.
Biogen Inc (BIIB.O) surged 2.09 percent after the drugmaker reported fourth-quarter revenue that beat Wall Street estimates on higher sales of recently launched drug Spinraza.
The company's stock rose four percent in pre-market trading before losing 0.41 percent in late trading.More news: Irving threatened to sit out with injury if he wasn't traded
The S&P 500 increased 8.52 points, or 0.30 per cent, to 2,846.06.
The Russell 2000 is up 4.04 points, or 0.3 percent.
Robust quarterly earnings and economic data have given Wall Street a strong start to 2018, with the three major indexes up more than 6 percent year to date.
As of Thursday, 77 per cent of the S&P 500 companies that had reported surpassed earnings expectations, while 79 per cent of those companies had beaten sales estimates, according to United States financial information company FactSet.More news: Seckford Foundation Free Schools Trust ranked in top 10 MATs in England
The S&P 500 is up 28.95 points, or 1 percent.
After the close of trading on Thursday, results are expected from Intel Corp and Starbucks Corp. The monthly average of claims fell by 3,500 to 240,000.
Volume on US exchanges was 7.2 billion shares, compared to the 6.7 billion average over the last 20 trading days.More news: Swiss mummy identified as ancestor of British politician Boris Johnson