According to the French Interior Ministry, Macron won the first round with 24.01 percent of the vote, while Le Pen came in second with 21.3 percent of the vote.
Surveying Le Pen's results against more than a dozen such measures, the data suggest her message played particularly well in low-income areas with higher numbers of school dropouts.
In a solemn address to voters, Mr Hollande warned of the "risk for our country" of a far-right victory and said he himself would vote for Mr Macron, who served as his economy minister for two years.
The euro was little changed at $1.087 early on Tuesday, retaining Monday's 1.3 percent gain, its strongest one-day performance in 10 1/2 months, that lifted it to a 5 1/2-month high.
Gentiloni held a telephone conversation on Monday with Macron following his win in first round of the election, and both sides agreed to jointly work toward European prosperity, Sputnik reports quoting the Italian government press service. In London, the FTSE 100 jumped 2%, while in Paris, the CAC 40 popped 4%.More news: China warns United States to 'exercise restraint' in Korean Peninsula
The dollar advanced 0.4 percent to 110.085 yen on Tuesday, extending Monday's 0.6 percent jump as investors sold off the safe-haven yen.
France's outgoing president, Francois Hollande, as well as Prime Minister Bernard Cazeneuve and former prime minister Manuel Valls have also backed Macron.
The vote revealed a country deeply divided, with 39-year-old Mr Macron, an advocate of open borders and free trade, leading the vote in cities and Ms Le Pen topping the polls in rural areas that feel left behind by globalisation.
Mr Macron's defeated rival in Sunday's election François Fillon has already endorsed him.
However, Mr McGuire cautioned that, after the UK Brexit vote and the election of Donald Trump in the U.S., no one should take anything for granted ahead of the second round on 7 May.More news: Jeremy Corbyn: Labour leader to make election visit to Cardiff
France must reject Le Pen, again.
Octavio Marenzi, chief executive of the financial research consultancy Opimas, in Paris, said: "Macron will be reassuring to markets, with his pledge to lower corporate taxes and to lighten the administrative burden on firms".
"Firstly, Macron is a politically stable, centrist candidate, nearly like France's Obama. Secondly, it helps to solidify the future of the European Union and the euro, something that Marine Le Pen wants to destroy".
Asian markets also rose. "We could also see French bond yields fall on Monday, once this result is confirmed", Ms Brooks said.
"A Le Pen win would mean the unravelling of the euro and most likely the dissolution of the European single currency, most likely the collapse of the European Union", he said.More news: Korea watchers on why army's big day has taken a backseat
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