Wall Street finishes up as stimulus talks continue; S&P 500, Nasdaq register biggest weekly gains since July

US stocks rose on Friday and the S&P 500 and Nasdaq registered their biggest weekly percentage gains since July as optimism over more federal fiscal aid grew.

Talks were expected to continue on a COVID-19 stimulus package, even though US House Speaker Nancy Pelosi and Treasury Secretary Steven Mnuchin failed on Friday to reach agreement.

Mnuchin floated a new proposal Friday afternoon, but an aide for Pelosi said it lacked a broad plan to contain the pandemic.

Recent trading on Wall Street has been dictated by headlines on fiscal aid, with the three main indexes tumbling on Tuesday after US President Donald Trump called off negotiations. He has since indicated he was willing to resume discussions.

"The market`s reacting well to Trump`s sudden turnaround in terms of a support package," said Tim Ghriskey, chief investment strategist at Inverness Counsel in New York, New York. "A lot of this has been politics, but a lot of people believe the economy really needs some economic support here, so that`s a good thing."

The S&P 500 technology shares rose 1.5%, and the sector gave the S&P 500 its biggest boost. The small-cap Russell 2000 index climbed 6.4% for the week, posting its biggest percentage gain since early June.

The Dow Jones Industrial Average rose 161.39 points, or 0.57%, to 28,586.9, the S&P 500  gained 30.31 points, or 0.88%, to 3,477.14 and the Nasdaq Composite added 158.96 points, or 1.39%, to 11,579.94.

For the week, the S&P 500 rose 3.8% and the Nasdaq climbed 4.6%, their biggest weekly percentage gains since July. The Dow added 3.3%, its biggest weekly gain since August.

Strategists say investors have also begun to digest the possibility of Democratic candidate Joe Biden winning the November 3 presidential election after a fractious debate last month led to a jump in his lead over Trump in several national polls.

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Xilinx Inc surged 14.1% after a report said Advanced Micro Devices Inc was in talks to buy the chipmaker in a deal valued at more than $30 billion. General Electric Co rose 2.9% as a report said Goldman Sachs reinstated coverage on the U.S. industrial conglomerate with a "buy" rating, saying the company will emerge stronger from the COVID-19 pandemic.

The S&P 500 energy index fell 1.6% following recent gains. Advancing issues outnumbered declining ones on the NYSE by a 1.30-to-1 ratio; on Nasdaq, a 1.42-to-1 ratio favored advancers. The S&P 500 posted 76 new 52-week highs and one new low; the Nasdaq Composite recorded 141 new highs and 18 new lows. Volume on U.S. exchanges was 8.92 billion shares, compared with the 9.76 billion average for the full session over the last 20 trading days.