Andy van Horssen

Computer scientist (Netherlands) and competitive programmer; IOI 2021 bronze and IOI 2022 silver for the Netherlands; Mathematics and Computer Science at Oxford (St John's, 2022-2025). Profile lists quantitative-research work at Citadel Securities and Jump Trading Group.

Notes7

• Quant employment verification: CONFIRMED - supported identity plus actual Quantitative Researcher / intern roles at Citadel Securities (quant market maker) and Jump Trading Group (quant proprietary trading firm); role provenance is the LinkedIn index and an aggregator only, and no employer primary source was found.
• LinkedIn profile record lists Quantitative Researcher (Systematic Equities) at Citadel Securities from 2025, with prior Quantitative Researcher Intern roles at Citadel Securities (2025) and Jump Trading Group (2024) - index/aggregator employment data, not independent primary-source confirmation.Jan 1, 2025
• IOI 2021 bronze medal (rank 140) and IOI 2022 silver medal (rank 55, 309.13/600) competing for the Netherlands - the Olympiad identity in the brief is confirmed by the official IOI statistics page.Aug 15, 2022
• IOI official statistics page lists a public contact e-mail, [contact omitted], and a Codeforces profile link; the page also carries the handle used across the competitive-programming ecosystem.
• Oxford CS (23 Apr 2024) reports an Oxford team took gold and 4th place at the 46th ICPC World Final in Luxor (rescheduled from 2022), Eastern Europe's first Western-European gold since 2006; team continuity from the NWERC 2022 squad links this result to the subject, though the article does not name team members.Apr 23, 2024
• Oxford Department of Computer Science (30 Nov 2022) names Andy van Horssen (St John's) on the Oxford team with Xingjian Bai and Yichen Huang that won a gold medal at the Northwestern European Regional Contest (NWERC) in Delft, solving 10/12 problems and placing 4th - the team that advanced to the ICPC World Finals.Nov 30, 2022
• Read Mathematics and Computer Science at the University of Oxford (2022-2025) and was a member of St John's College, per the LinkedIn profile record and the college-linked Oxford CS report.Nov 30, 2022
• theorg.com lists Andy van Horssen as a Quantitative Researcher at Citadel Securities (flagged 'Unverified') alongside its org chart; the aggregator independently repeats the employer but does not constitute primary-source confirmation.
• The Competitive Programming Hall of Fame (cphof.org) ties the Codeforces handle Andyvanh1 to Andy van Horssen (Netherlands) and records IOI 2021 bronze, IOI 2022 silver, and an ICPC World Finals participation, an aggregator cross-linking the competitive-programming identities rather than a primary source.
• The Oxford CS NWERC report notes the university's competitive-programming teams were supported by OxFORD Asset Management, a technology-driven investment firm - a sponsorship of the team, not a role held by the subject.Nov 30, 2022
• Instagram handle @andyvanh1 matches the Codeforces handle Andyvanh1 that cphof.org attributes to the subject; the account was surfaced by handle search and is a candidate social identity rather than a confirmed profile.