Alexander Song

Quantitative research associate at Citadel in London, working in Fixed Income and Macro. Graduated in Mathematics from Trinity College, Cambridge in 2022. Prior quantitative experience includes researcher roles at Xantium Group (Tudor Investment Corporation) and internships at Optiver and DRW. Represented the United Kingdom at the International Mathematical Olympiad in 2017 while at Westminster School.

Notes5

• Quant employment verification: CONFIRMED. Identity: the LinkedIn profile uk.linkedin.com/in/alexandersong00 names Alexander Song, a Mathematics graduate of Trinity College, Cambridge (2019-2022) and Westminster School alumnus, matching the IMO 2017 UK contestant 'Alexander Song' (imo-official.org contestant 27774; UK IMO Register). This is a single-source (LinkedIn) identity match, not independent primary-source confirmation of the employment claims. Actual work/internships: (1) Quantitative Research Associate, Citadel, London, from May 2023, listed as current on LinkedIn (index/LinkedIn-only, i.e. an aggregator/profile claim, not independently confirmed); (2) Quantitative Researcher, Xantium Group - Tudor Investment Corporation, London, Nov 2022 - May 2023 (LinkedIn-only); (3) Quant Trader Intern, Optiver, Amsterdam, Jul-Aug 2022 (LinkedIn-only, described as simulated options trading and model development); (4) Quant Trading Summer Analyst, DRW, Jun-Sep 2021 (LinkedIn-only; equity/ETF market-impact modelling). Student/early programmes distinct from work: Citadel 'Spring Intern' 2020 (Discover Citadel programme), Jane Street 2020 (SPiN programme offer holder), Morgan Stanley 2020 Spring Intern in Technology, Northern Trust 2017 work shadowing. Employer quantitative-finance classification: Citadel (citadel.com) is a multi-strategy hedge fund operating systematic/quantitative strategies (Wikipedia); Xantium (xantium.com) is Tudor Investment Corporation's London quantitative trading/investment arm (its site + Tudor); Optiver (optiver.com) is an Amsterdam proprietary market-making firm (Wikipedia); DRW (drw.com) is a proprietary trading firm with a quantitative-trading function (Wikipedia); Jane Street is a quantitative trading firm; Morgan Stanley runs institutional securities/quant desks. All classified as quantitative finance. Basis is LinkedIn-derived and unverified against primary payroll/employer sources; treated as CONFIRMED on a supported identity plus actual listed roles/internships, with the index-only nature of every employment claim stated.Sep 17, 2026
• Citadel LLC (citadel.com) is a global multi-strategy hedge fund whose strategies are described as quantitative/systematic, so the 'Quantitative Research Associate, Fixed Income and Macro' role aligns with the employer's actual quant-finance activity; the role itself is sourced only from the LinkedIn profile.Sep 17, 2026
• Xantium Group (xantium.com) is the London quantitative trading/investment arm of macro hedge fund Tudor Investment Corporation, confirming it operates in quantitative finance rather than being a name-only 'quant' firm.Sep 17, 2026
• Optiver (optiver.com) is an Amsterdam-based proprietary market-making/options firm, confirming the Quant Trader Intern placement was at an actual quantitative-trading employer; the internship content (simulated options trading, backtesting a US Energy model) is stated only on the LinkedIn profile.Sep 17, 2026
• DRW (drw.com) is a proprietary trading firm with a quantitative-trading function, confirming the Quant Trading Summer Analyst role was at an actual trading employer; the described work (Python/ML analysis of ETF RFQ timing and market impact, options-volatility factors) is stated only on the LinkedIn profile.Sep 17, 2026
• No personal website, blog, GitHub, X account, or press attributable to this Alexander Song was found; profiles sharing the name belong to other people, so the dossier rests on the LinkedIn backbone plus the IMO record.Sep 17, 2026
• Morgan Stanley's 2020 'Spring Intern in Technology' was a student insight programme (led to a Summer 2021 offer) and is distinct from a quantitative-finance work role; it is not counted toward quant employment.2020