The S&P 500 and Dow Jones Industrial Average have closed at record highs after the US Federal Reserve predicted a fast economic recovery from the coronavirus pandemic and said it would maintain its interest rate at close to zero.
In its statement on Wednesday following its two-day policy meeting, the Federal Reserve projected a rapid jump in US economic growth and inflation this year as the COVID-19 crisis winds down, and repeated its pledge to keep its target interest rate near zero for years to come.
Wall Street extended gains after Fed Chair Jerome Powell said during a news conference that it was too early to discuss tapering-off measures to support the struggling economy.
"The Fed statement today was more optimistic than some expected, they raised their outlook for both economic growth and the labour market. The market's view of the statement is that it was fairly optimistic," said David Carter, chief investment officer at Lenox Wealth Advisors in New York.
A $US1.9 trillion spending stimulus and the rollout of vaccines have fuelled a rotation into so-called value stocks that are viewed as likely to outperform as the economy recovers from the coronavirus pandemic.
At the same time, worries the stimulus could overheat the economy and lead to higher inflation rates have triggered a strong rise in long-duration Treasury yields and made technology and other growth stocks less attractive.
Following the Fed's statement, the yield on 10-year Treasuries ticked lower to 1.6374 per cent.
The Dow Jones Industrial Average rose 0.58 per cent to end at 33,015.37 points, while the S&P 500 gained 0.29 per cent to 3,974.12.
The Nasdaq Composite climbed 0.4 per cent to 13,525.20. The Nasdaq remains down about four per cent from its Feb. 12 record-high close.
Amazon.com Inc rose 1.4 per cent and Tesla Inc added 3.7 per cent, with the two companies giving the greatest lift to the S&P 500.
Six out of 11 S&P 500 sector indexes rose, with industrials and consumer discretionary the strongest performers and both up over one per cent.
Fast-food retailer McDonald's Corp gained 1.9 per cent after Deutsche Bank raised its target price on the stock and also upgraded its recommendation to "buy" from "hold".
Advancing issues outnumbered declining ones on the NYSE by a 1.33-to-1 ratio; on Nasdaq, a 1.46-to-1 ratio favoured advancers.
The S&P 500 posted 44 new 52-week highs and no new lows; the Nasdaq Composite recorded 124 new highs and 18 new lows.
Volume on US exchanges was 11.9 billion shares, compared with the 14.2 billion average for the full session over the last 20 trading days.