Last week's extraordinary rallies continued to infect investor enthusiasm today as sentiment is now apparently leaning towards risk-taking (aka "buying") now that the market seems satisfied that Q3 is going to end well.  Consequently, the Dow zoomed up again, this time a big 165 points.  More significantly, the S&P with its big 25 point gain came within 30 points of its all-time high and the Nasdaq with an added 73 points did reach a 15 year high.  All in all, it was a pretty historic day, despite the fact that the October manufacturing report was at a 2-1/2 year low but this was compensated by a rise in new orders which triggered more buying than selling.  Exxon and Chevron also turned in solid Q3 reports which shot their stocks up and the overall energy index, which has been ailing lately, up 2.4 percent.  There was even good news from the biotech sector when good old Valeant shot up 7.1% after its recent beatings, all on mere news that there were no additional accusations being made against them.  Volume was close in line with recent averages at 6.9 billion.

Markets | Mon Nov 2, 2015 8:19pm EST

Wall St. climbs, led by energy, healthcare; Nasdaq 100 hits 15-year high

DJ:  17,828.76  +165.22     NAS:  5,127.15  +73.40        S&P:  2,104.05  +24.69

(Reuters)  U.S. stocks added to their recent run with gains across all sectors on Monday, led by increases in the beaten-down energy group and the acquisition-driven healthcare industry.

The gains on the first trading day of the month followed the best monthly performance of the major indexes in four years in October. The Nasdaq 100 .NDX on Monday closed at its highest level in more than 15 years.

Data on Monday showed U.S. manufacturing activity in October sank to a 2-1/2-year low, but a rise in new orders offered encouragement. Elsewhere, factory activity in Germany beat economists' estimates, and manufacturing in Central and Eastern Europe kept up a robust pace in October.

"The fact that we have got sturdy numbers from outside the U.S. accompanied by a relatively decent ... (U.S. manufacturing) report, I think that cocktail was supportive of risk assets getting a boost," said Mark Luschini, chief investment strategist at Janney Montgomery Scott in Philadelphia.

The Dow Jones industrial average .DJI rose 165.22 points, or 0.94 percent, to 17,828.76, the S&P 500 .SPX gained 24.69 points, or 1.19 percent, to 2,104.05 and the Nasdaq Composite.IXIC added 73.40 points, or 1.45 percent, to 5,127.15.

The S&P, which is up nearly 13 percent since hitting its lowest level for the year in August, broke through the 2,100 barrier, bringing it nearer to its all-time closing high of 2,130.82 in May.

"The upward trend that was put in place last week has continued to gain steam," said Michael James, managing director of equity trading at Wedbush Securities in Los Angeles. "I don't necessarily think there's a specific catalyst for it today. Risk appetite has clearly increased."

As the U.S. earnings seasons winds down, investors are looking to economic data, including this Friday's employment report, for clues as to whether the Federal Reserve will raise interest rates when it meets in December.

The S&P energy index .SPNY rose 2.4 percent. Oil majors Exxon (XOM.N) and Chevron (CVX.N) were two of the three biggest drivers of positive performance for the Dow after both companies posted better-than-expected results on Friday. Chevron gained 4.5 percent to $94.96 and Exxon finished up 3.1 percent at $85.28.

The S&P healthcare index .SPXHC increased 2 percent. Pfizer (PFE.N) rose 3.7 percent, and AbbVie (ABBV.N) jumped 6.4 percent, providing the biggest boost to the sector.

Dyax (DYAX.O) soared 28.4 percent to $35.35 after British drugmaker Shire (SHP.L) said it would buy the company for about $5.9 billion. The Nasdaq biotechnology index .NBI closed up 3.8 percent

U.S.-listed shares of Valeant (VRX.N) rose 7.1 percent at $100.47 after short-seller Citron Research said it would not be releasing new allegations against the Canadian drugmaker.

The S&P financial sector .SPSY gained 1.6 percent, led by increases from the big banks. Visa (V.N) fell 3 percent to $75.22 after offering to buy its former subsidiary Visa Europe Ltd for as much as $23.3 billion. The stock was the biggest drag on the Dow and the S&P 500.

Hewlett-Packard started trading after its split. HP Inc (HPQ.N) jumped 13 percent to $13.83, while Hewlett Packard Enterprise (HPE.N) slipped 1.6 percent to $14.49.

Advancing issues outnumbered declining ones on the NYSE by 2,525 to 569, for a 4.44-to-1 ratio on the upside; on the Nasdaq, 2,217 issues rose and 628 fell for a 3.53-to-1 ratio favoring advancers.

The S&P 500 posted 25 new 52-week highs and four new lows; the Nasdaq recorded 76 new highs and 44 new lows.

Note:  Per BATS Exchange, volume was 6.9 billion.