Citadel's latest weapon in the hedge fund talent war is a big boomerang hire. Sep 23, 2026, 1:26 PM PT Third time's the charm. Matt Giannini, a well-known recruiter in the hedge fund industry, is returning to Ken Griffin's $76 billion Citadel for his third stint, two people familiar with the matter 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 spokesperson told Business Insider. 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 equity long-short business for less than a year. Walleye declined to comment. Giannini did not respond to a request for comment. He joined Walleye from Citadel as the smaller manager grew its leadership bench, including fellow Citadel alum Tom DeAngelis, now Walleye's president, and Anil Gondi, who joined as head of equity long-short from Balyasny and oversaw Giannini. Giannini's departure from Citadel in 2024 was one of the biggest hedge fund personnel moves that year, as the war for top investors was intensifying, and those who had succeeded in recruiting the best talent were in high demand. After Giannini's 2024 exit, Citadel lost a number of executives focused on recruiting investing talent in the 12 months that followed, Business Insider previously reported. The firm's chief people officer, Sjoerd Gehring, left earlier this year as well. The manager has since replenished its business development ranks with promotions and external hires, including individuals from firms such as Verition, BlackRock, and JPMorgan, though it has not yet named a replacement for Gehring. His first stint at Citadel, which began in 2007, ended when he started at multistrategy rival Balyasny in 2012. At Dmitry Balyasny's eponymous firm, Giannini eventually became global cohead of business development before being rehired by Citadel for the first time in late 2018. By the time he left Citadel for a second time, in 2024, he rose to the rank of global head of equities business development.

Amrize CFO steps down with immediate effect after just a few months. At building materials group Amrize, there is a surprising change at the top of the finance department. CFO Baris Oran is resigning with immediate effect for personal reasons after only a few months in office, as the company announced on Monday evening after the US stock market closed. His successor will be the previous head of strategy and M&A, Samuel J. Poletti. 24.08.2026 13:31 Oran had only taken over the CFO position at Amrize at the beginning of April and is now leaving the company after almost five months. Previously, the 52-year-old had been CFO of the US logistics group GXO Logistics and had also worked for the Sabanci Group, among others. Oran's successor Poletti has been a member of the group's executive board since Amrize's IPO in June 2025. He played a key role in the spin-off of the North American business from Holcim and was responsible for the financial and non-financial aspects of building the independent company. Previously, Poletti worked for Holcim for more than 20 years in the areas of M&A, finance, and strategy. Among other things, he was responsible for acquisitions in the North American roofing and building solutions business. As CFO, he will work at Amrize's operational headquarters in Chicago. In addition, Amrize appointed Dillon Cumming as head of Investor Relations. He will take up his position on September 8 and is expected to lead the global investor relations activities. Cumming comes from the asset manager Walleye Capital. Previously, he analyzed companies from the building materials industry, among others, at Morgan Stanley.