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Hedge fund giant Citadel taps former Amazon exec as chief technology officer. October 09, 2026 11:37 AM EDT Ken Griffin's hedge fund Citadel has tapped former Amazon vice president Matt Taddy as its new chief technology officer. This content is exclusive to P&I Daily subscribers. Get unlimited online stories, daily email alerts and access to P&I Searches and Hires content.

HRT hired Citadel's head of weather engineering in Chicago. 3 hours ago Two things are well known about Citadel. Firstly, it has one of the best weather forecasting teams in the hedge fund industry. Secondly, it has moved its head office from Chicago to Miami. Now, one of its top weather forecasters in Chicago has moved to Hudson River Trading's (HRT) Chicago office. Deron Roche, who joined Citadel in 2002 and was latterly titled 'Heather of Weather engineering, commodities, has moved to HRT as head of weather. Writing on LinkedIn, Roche said he'll be, "building at the intersection of weather, data, technology and markets." Roche's departure from Citadel follows that of another Chicago-based weather-focused engineer, Alex Alifimoff. Alifimoff says on LinkedIn that he is now at Point72 in Connecticut, where he is 'head of AI weather." Predicting the weather is an integral part of trading natural gas and commodities. Citadel declined to comment. HRT didn't respond to a request to comment. Follow me on X. Follow me on LinkedIn. Have a confidential story, tip, or comment you'd like to share? Contact: +44 7537 182250 (SMS, Whatsapp or voicemail). Telegram: @SarahButcher. Signal: sarahbutcher.22 Click here to fill in our anonymous form, or email [email protected]. Bear with us if you leave a comment at the bottom of this article: comments are moderated intermittently by human beings. Sometimes these humans might be asleep, or away from their desks, so it may take a while for your comment to appear. You must take sole responsibility for comments you post on this site. We will take reasonable steps to weed out anything that we consider to be offensive or inappropriate. The essential daily roundup of news and analysis read by everyone from senior bankers and traders to new recruits. Boost your career. Find thousands of job opportunities by signing up to eFinancialCareers today. Top Articles

Drew Gillanders will be hiring for Millennium's new London equities business. Maybe not from Citadel. 5 hours ago Drew Gillanders, aged 54, is leaving Citadel and joining Millennium. His exit from Citadel was reported last month. Bloomberg reported this week that Gillanders will soon be running a new Millennium business in London focused on international equities under Pete Santoro and Michael Chung. Gillanders didn't respond to a request to comment for this article. Both Citadel and Millennium declined to comment. Gillanders hasn't actually arrived at Millennium's UK business yet. He's thought to be on a notice period which is likely to last for at least a year. Since his departure, Citadel's international equities business has been run by 40-year-old Nabeel Bhanji from Elliott Management. Bhanji joined in November 2025. Citadel restructured its London equities operation and the international equities business run by Gillanders has now been combined with Citadel's "Strategic Equity Investments" team, run by Bhanji. Gillanders himself spent seven years at Citadel after joining in 2019. As Citadel's head of international equities from 2023, Gillanders is thought to have run a business encompassing 10-15 different portfolios. If this is replicated at Millennium, he could be doing a lot of hiring there. However, this hiring at Millennium may not involve people from Citadel. Gillanders is likely to be under a non-solicit agreement that will prevent him from recruiting his former colleagues for at least 15 months. Citadel also operates in a very different way to Millennium. Speaking to London students two years ago, Gillanders explained that Citadel takes a long-term view on risk and is able to "take more duration than other funds." Gillanders elaborated that: "Some of our peers have a more centralized risk function where if you're down 2% you have capital taken away from you. This means that you're having interactions with the risk function when you're 85 basis points down, and so you're playing not to lose rather than to win. Your returns in this case will likely be no more than 2% because you never let winners run and you cut losers very tightly." This all sounds a bit similar to the approach at Millennium, where risk limits can be famously inflexible. The Wall Street Journal reported last year that Millennium can cut teams' capital in half when losses hit 5% and then fire portfolio managers when losses exceed 7.5%. Portfolio managers familiar with the flexy regime at Citadel may not be partial to the Millennium approach. Gillanders himself will also need to adapt. Millennium's equities business has been co-run by Peter Santoro since 2017. Like Gillanders, Santoro previously worked for Citadel and Morgan Stanley. Unlike Gillanders, who is a former M&A banker and is focused on fundamental investing, Santoro is a career equities trader. Santoro moved to London last year and has already overseen a build of Millennium's London equities business. In February, he hired Erdit Hoxha, the former co-head of equities at Goldman Sachs, to sit in London within Millennium's 'office of the chief investment officer.' He also added Antoine Foucher from North Rock in December last year to run "equity advisory services." Foucher then hired Dom Duffy from Squarepoint in August. If you want to work for Millennium's expanding London equities business, you could try hitting up Santoro before Gillanders arrives. Alternatively, there's Sameer Buch, the London-based fundamental equities business development executive who joined in May. Santoro and Buch are likely to have hired Gillanders. It's not clear how much Millennium paid for the privilege, but DG was likely earning at least $10m at Citadel in London, even though he wasn't listed as a partner at any of its UK entities from 2021. Follow me on X. Follow me on LinkedIn. Have a confidential story, tip, or comment you'd like to share? Contact: +44 7537 182250 (SMS, Whatsapp or voicemail). Telegram: @SarahButcher. Signal: sarahbutcher.22 Click here to fill in our anonymous form, or email [email protected]. Bear with us if you leave a comment at the bottom of this article: comments are moderated intermittently by human beings. Sometimes these humans might be asleep, or away from their desks, so it may take a while for your comment to appear. You must take sole responsibility for comments you post on this site. We will take reasonable steps to weed out anything that we consider to be offensive or inappropriate. The essential daily roundup of news and analysis read by everyone from senior bankers and traders to new recruits. Boost your career. Find thousands of job opportunities by signing up to eFinancialCareers today. Top Articles