"The share of the top 1 per cent has been on an upward path ever since [the crisis], passing the 2000 level in 2013 and achieving new peaks every year thereafter," the annual report said.
The bank said "global wealth inequality has certainly been high and rising in the post-crisis period".
Overall, Credit Suisse found global wealth at mid-2017 totalled $407 trillion, up 6.4 percent year-on-year, the fastest pace of growth since 2012 thanks to surging equity markets and more valuable non-financial assets such as property.
However, the wealth is heavily concentrated among millionaires.
More than two-fifths of the world's millionaires live in the United States, while seven per cent live in Japan and six per cent live in the UK, according to The Guardian.
The global population of millionaires has grown considerable over recent years, and the population of those with net worths of more than US$50 million has increased even more quickly.
"The number of millionaires has increased by 170 per cent [since 2000], while the number of UHNWIs [ultra-high net worth individuals] has risen five-fold, making them by far the fastest-growing group of wealth-holders," the report said.
The world's poorest are mostly found in developing countries, with more than 90 per cent of adults in Africa and India having less than $14,547 to their name.
"In some low-income countries in Africa, the percentage of the population in this wealth group is close to 100 per cent," the report said.
"For many residents of low-income countries, life membership of the base tier is the norm rather than the exception."
The study also found that young people are struggling to earn more money and find better jobs than their parents, despite being more highly trained.
Defined by the US Census Bureau as being those born between 1982 and 2000 - so between 35 and 17, now - millennials face tougher borrowing rules, rising home prices, and lower income mobility, the study said.
'With the baby boomers occupying most of the top jobs and much of the housing, millennials are doing less well than their parents at the same age, especially in relation to income, home ownership and other dimensions of wellbeing,' the Swiss bank wrote in its annual Global Wealth report.
As a result only high achievers and those in lucrative areas like technology and finance have better prospects than their parents.
Overall, Credit Suisse found global wealth at mid-2017 totalled $407 trillion, up 6.4 percent year-on-year, the fastest pace of growth since 2012 thanks to surging equity markets and more valuable non-financial assets such as property.
