Though StoneCo (NASDAQ: STNE) was likely bought by one of Warren Buffett's younger lieutenants at the time of its 2018 initial public offering (IPO), Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) owns about $183 million worth of the Brazilian fintech today. High inflation has also led to rapidly increasing interest rates in Brazil and a depreciation of the Brazilian currency, the real. CEO Thiago Piau says that the margin compression will be temporary, not structural, as a lot of these rising costs are investments in expanding StoneCo's product set.