The industry pioneer Renaissance Technologies Weighs Rare Tweaks to Its Trading Models After Two Funds Suffer Record Losses Amid Meme-Stock Whiplash

"Renaissance told clients it is weighing an adjustment in its trading models after the two funds, which together manage nearly $20 billion, suffered their worst months ever in October before surging in November. Renaissance’s investing algorithms weren’t prepared for recent, unusual moves in the shares of some small companies, including so-called meme stocks, people familiar with the matter said."

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