Sebastian Fodor

Sebastian Fodor is a Swedish quantitative professional indexed on LinkedIn as a Quantitative Trader at Jane Street in London since 2020; that employment claim comes only from an index/self-reported profile, not an independent primary source. He represented Sweden at the 2018 International Mathematical Olympiad, winning a silver medal with 28 points. He studied mathematics at Stockholm University (indexed 2018-2020), completed a 2020 master's thesis supervised via KTH/Stockholm University titled 'Understanding Convergence of Accelerated Gradient Descent Methods', and worked as a teaching assistant at Stockholm University 2019-2020.

Notes11

• Quant employment verification: UNRESOLVED. The only evidence of a quantitative-finance role is the LinkedIn profile linkedin.com/in/sebastian-fodor-0ab7a11b1 (an index/self-reported source), which lists 'Quantitative Trader at Jane Street, London, 2020-present'. Jane Street is a proprietary trading firm / quantitative market maker, so the employer classification is genuinely quantitative finance and the entry is a full-time trading role, not a student program, insight day, camp or scholarship. However the employment is not corroborated by any independent primary source (no Jane Street page, press, filing or registry), and per the task's caution an index-only listing cannot be treated as independent confirmation. Identity support is circumstantial but consistent: the same profile lists a Stockholm University Teaching Assistant role 2019-2020 that matches the period in which the IMO 2018 Sweden competitor studied mathematics at Stockholm University, and the name, Swedish base and mathematics background align. There is no explicit cross-link (no source ties the LinkedIn account to the IMO contestant), so the role cannot be elevated to CONFIRMED on the available evidence.
• Won a silver medal for Sweden at the 59th International Mathematical Olympiad (2018), scoring 28 points (P1-P6: 7/7/0/7/7/0), ranked 87th overall (85.5%); Sweden's team placed 24th.
• Defended a master's thesis titled 'Understanding Convergence of Accelerated Gradient Descent Methods' on 3 June 2020 in a Stockholm University/KTH mathematics seminar, indicating a master's-level degree in mathematics/optimization.
• No primary-source evidence was found that the Jane Street role is current as of 2026; the profile should not be read as confirming present-day employment, only a self-reported indexed start in 2020.
• Qualified for the Swedish Mathematics Olympiad (PO) final held 2-4 February 2018; the qualification list also places him among Sweden's strongest competition-mathematics students of his cohort, several of whom (e.g. Arvid Lunnemark) joined the IMO team.
• The 2020 Stockholm University mathematics master's/independent-works report lists 'Understanding Convergence of Accelerated Gradient Descent Methods', corroborating the 2020 thesis and the mathematics degree.
• Indexed LinkedIn lists a Teaching Assistant role at Stockholm University (2019-2020, su.se domain) prior to the Jane Street role; the sequence from mathematics study/TA work into a trading role is consistent with a quantitative research/teaching background but no source states a reason for the move.
• Featured in a Dagens Nyheter article as one of three Stockholm students (with David Warn and Nicole Hedblom) representing the city at the Baltic Way mathematics competition; profiles him as part of Sweden's high-school competition-maths elite.
• A Kungsholmens gymnasium student-union event page advertises a talk 'Sebastian Fodor - Tavlingsmatematik & Universitetsmatte!' (competition mathematics & university maths), indicating he was invited to speak/mentor on mathematics while still a student.
• Local Stockholm news outlets (SVT, Sveriges Radio, Skolporten) covered the same Baltic Way / competition-mathematics story, confirming public recognition during his school years.
• A Skolornas matematiktavling Facebook post references DN coverage of Sebastian Fodor among the students competing that weekend, corroborating his competition-mathematics profile.
• Candidate social accounts (facebook.com/sebastian.fodor.37, instagram.com/sebastian_fodor, tiktok.com/@sebastian.fodor, youtube.com/@sebastians.8991) surfaced by name search but none is verified against the trader/olympian identity, so they are recorded only as unverified leads and not saved as confirmed profile URLs.