Mohamed El Sewedy, chairman of the Federation of Egyptian Industries, said, however: "The business community is very happy about the results. My friends and I have a lot of hope."
"Everybody just wants some form of stability against which you can decide what to invest. When there's stability it makes risk assessment much easier," said Angus Blair, chairman of business and economic forecasting think-tank Signet.
Most Egyptian newspapers celebrated the result, with state-run Al-Akhbar calling it "a day of hope for all Egyptians".
Fireworks erupted in Cairo to celebrate Sisi's victory late on Wednesday. His supporters waved Egyptian flags and sounded car horns as celebrations lasted through the early hours of the morning.
About 1,000 people gathered in Tahrir Square, the symbolic heart of the popular uprising that toppled Mubarak in 2011 and raised hopes of a democracy free of influence from the military.
As Egyptians traveled to work, there were only a handful of Sisi supporters left in Tahrir.
Critics fear Sisi will become another autocrat who will preserve the army's interests and quash hopes of democracy and reform.
REUTERS/AP
To watch Nicole Hajal's report, please click on the video above.