Ken Griffin's $76 billion Citadel has rehired Matt Giannini, two people familiar with the matter say. Giannini had spent less than a year at Walleye, where he was the COO for the firm's stockpicking unit. This will be Giannini's third stint at Citadel, which is fighting for top investors in the industry's talent war. A spokesperson told Business Insider, "We're pleased to welcome Matt back to Citadel. We expect him to materially contribute to our ambitious plans to continue growing our Equities business." A person close to the Miami-based manager said he would start in 2027. Giannini is joining from Walleye Capital, where he was the chief operating officer of the firm's
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