One reason for the rise of the new super rich is Sweden's thriving tech scene. The country has a reputation as the Silicon Valley of Europe, having produced more than 40 so-called unicorn start-ups - companies worth more than $1bn - in the past two decades.
Skype and Spotify were founded here, as well as gaming firms King and Mojang. More recent global success stories include the financial tech start-up Tink, which Visa acquired for around $2bn during the pandemic, healthcare company Kry, and the e-scooter company Voi.
At Epicenter - a shared office and community space with a giant glass atrium - veteran entrepreneur Ola Ahlvarsson traces this success back to the 1990s. He says a tax rebate on home computers in Sweden "wired or connected all of us much faster than other countries".
A serial co-founder himself, he also points to a strong "culture of collaboration" in the start-up scene, with accomplished entrepreneurs often becoming role models for - and investors in - the next generation of tech companies.
Sweden's size makes it a popular test market, too. "If you want to see if it works on a larger market, you can - at limited cost and without too much risk for your brand or for your stock price - try things here," says Mr Ahlvarsson.
But Mr Cervenka argues there is another narrative that deserves more attention - monetary policies which he says have helped transform the country into a paradise for the super rich.
Sweden had very low interest rates from the early 2010s until a couple of years ago. This made it cheap to borrow money, so Swedes with cash to spare often chose to invest in property, or high risk investments like tech start-ups, many of which shot up in value as a result.
"One of the big factors that's driven this huge increase in billionaires is that we've had, for a number of years, quite a strong inflation in the value of assets," says Mr Cervenka.
Although top earners in Sweden are taxed more than 50% of their personal incomes - one of the highest rates in Europe - he argues that successive governments - on the right and left - have adjusted some taxes in a way that favours the rich.
The country scrapped wealth and inheritance taxes in the 2000s, and tax rates on money made from stocks and pay outs to company shareholders are much lower than taxes on salaries. The corporate tax rate has also dropped from around 30% in the 1990s to around 20% - slightly lower than the European average.
"You don't have to move out of Sweden if you're a billionaire today. And actually, some billionaires are moving here," says Mr Cervenka.
Back on Lidingö island, Konrad Bergström agrees that Sweden has "a very favourable tax system if you are building companies". However he says his wealth has a positive impact because his businesses - and homes - provide employment for others.
"We have a nanny and we have a gardener and cleaners… and that also gives more jobs. So we shouldn't forget about how we're building the society."
Mr Bergström points out that wealthy Swedish entrepreneurs and venture capitalists are also increasingly reinvesting their money in so-called "impact" start-ups, which have a focus on improving society or the environment.
In 2023, 74% of all venture capital funding to Swedish start-ups went to impact companies. This the highest percentage in the EU, and far above the European average of 35%, according to figures from Dealroom, which maps data on start-ups.
Perhaps the country's most high profile impact investor is Niklas Adalberth, who co-founded the unicorn payments platform Klarna. In 2017, he used $130m of his fortune to launch the Norrsken Foundation, an organisation that supports and invests in impact companies.
"I don't have the habits of a billionaire in terms of having a yacht or a private jet or anything like that," says Mr Adalberth. "This is my recipe for happiness."