Internet reported that hedge funds suffered the largest margin call since 2020 after Trump's tariffs triggered a sharp fall in global financial markets. Wall Street banks have asked their hedge fund clients to put up more money as loan guarantees because the value of their assets has shrunk significantly, according to three people familiar with the matter. Several major banks issued the largest margin calls to customers since the beginning of 2020, highlighting the sharp turmoil in global markets on Thursday and Friday. "Interest rates, stock markets and oil prices fell sharply... it is the breadth of overall volatility that has contributed to the size of margin calls," said one prime brokerage executive. He added that this was reminiscent of the large market volatility in the early months after the COVID-19 outbreak. "We are proactively engaging with clients to give them a full understanding of the risks," said a prime brokerage executive at another major U.S. bank.