Credit Suisse analyst Andrew Garthwaite said Macron is "a good choice" for both the French economy and financial markets.
"Macron's policies are clearly pro-Europe, and as economy minister he implemented reasonable reforms to improve the competitiveness of French companies and liberalise the economy," he added.
On Wall Street, US stocks joined the relief rally, with the Nasdaq touching a new record high and the Dow Jones posting triple digit gains.
Banking stocks were among the biggest beneficiaries of the Macron first-round victory, which quelled concerns about a Le Pen win and a Frexit.
Neil Wilson, of ETX Capital, said: "Banks are doing well because there is now no major risk of significant outflows from the European banking system as investors no longer worry about the future of the euro."
The Euro Stoxx Bank index recorded its biggest one day gain in almost five years, rising 2pc. Barclays jumped 5.4pc, Standard Chartered leapt 4.8pc and Royal Bank of Scotland bounced 4pc.
Meanwhile, Europe's fear gauge, the Euro Stoxx 50 Volatility index fell 8.8 points, wiping out gains made earlier this month as investors fretted about the outcome of the first round vote.
On currency markets, the euro popped by as much as 2.3pc against the US dollar to its highest level in almost six months of $1.0939, before retreating slightly in the afternoon to trade below $1.08. Meanwhile, the pound suffered its worst day against the euro since January, falling around 1.4pc to close just shy of 85p per euro.
Currency analyst Lee Hardman, of MUFG, said: "The market's focus will begin to shift away from political risk in Europe, and more onto the improving economic fundamentals which should begin to offer the euro more support going forward."
Election relief also spread to bond markets. French 10-year bond yields fell by over 10 basis points to more than three-month lows at 0.74pc, while the German-French 10-year bond yield, seen as a barometer of French election risks, tightened to around 40 basis points, down from around 62 basis points before the vote.