Fyodor Gainullin

Estonian mathematician (IMO 2008 bronze) with an Oxford MMath and an Imperial College PhD in geometric topology; quantitative analyst at the algorithmic trading firm XTX Markets in London since 2016, and a member of XTX Research LLP from 2017 to 2026.

Notes14

• Quant employment verification: CONFIRMED. Fyodor (Fjodor) Gainullin held an actual employment role in quantitative finance: he is recorded at Companies House as a member of XTX Research LLP from 15 Oct 2017 until his appointment was terminated on 16 Apr 2026 (LLTM01 filing), and LinkedIn plus The Org list him as a Quantitative Analyst in XTX Markets' Quantitative Analysis team in London. Employer classification: XTX Markets is a principal algorithmic/market-making trading firm that XTX's own site describes as 'a leading algorithmic trading firm' forecasting prices for 50,000+ instruments; XTX Research LLP is the XTX-associated research/partnership entity. The identity is supported by converging evidence: IMO 2008 roster name Fjodor Gainullin (Estonia), an eFinancialCareers feature naming 'Fjodir Gainullin, an Estonian with a PhD from Imperial and degree from Oxford' among XTX's highest earners, the Imperial mathematics PhD page, and LinkedIn's education history (Tallinna Tonismae Reaalkool, Oxford MMath, Imperial PhD).
• Index-only employment claim: the starting lead listed two identical 'Quantitative Analyst, XTX Markets' roles; this is a single current role, not two separate positions. Current employment rests on LinkedIn/The Org index data (joined Jun 2016) and is NOT independently confirmed by the Companies House record, which only shows LLP membership ending April 2026.
• Companies House primary record: appointed member of XTX Research LLP (OC397853) on 15 Oct 2017, alongside co-members including Paul Bereza, Peter Cawley, Pawel Dziepak, Maxime Goutagny and Renat Khabibullin; registration number and filing history are independent primary evidence of the quant-firm association.
• eFinancialCareers named him, in a piece on XTX's highest earners/profit-share members, as 'Fjodir Gainullin. An Estonian with a PhD from Imperial and degree from Oxford' — a press corroboration that ties the Estonian Olympiad identity to the XTX quant role.
• Bronze medal at IMO 2008 representing Estonia (15 points, rank 238); he was one of five Estonian contestants, alongside Kairi Kangro, Rauno Siinmaa, Kadi Liis Saar and Olga Bulgakova.
• University of Oxford: MMath (Master of Mathematics) at St Peter's College, winning the Oxford Masters in Mathematical Sciences (OMMS) Junior Mathematical Prize, and the Carl Albert Prize at St Peter's College.
• PhD in mathematics at Imperial College London (2016), supervised by Dr Dorothy Buck, on surgery on 3-manifolds; received the Doris Chen Merit Award (Jul 2015).
• Research output in geometric topology: papers on Heegaard Floer homology and Dehn surgery, including 'The mapping cone formula in Heegaard Floer homology and Dehn surgery' (arXiv 1411.1275) and 'Heegaard Floer homology and knots determined by their complements' (arXiv 1504.06180, 27 citations).
• PhD thesis deposited in Imperial's Spiral repository, titled on Dehn surgery and Heegaard Floer homology (mapping cone formula); presented for the degree of Doctor of Philosophy of Imperial College London.
• Gave a seminar talk 'Dehn Surgery and Heegaard Floer Homology' at Imperial's geometry seminar, and appeared as an attendee in the Young Topology Meeting UK 2013 participant list — academic activity during the PhD period.
• Listed by the Mathematics Genealogy Project as Fyodor Gainullin, Imperial College London 2016 (advisor Andras Juhasz's entry) — independent academic-registry confirmation of the PhD.
• An ORCID record (0000-0001-6851-1403) appears in search results listing Fyodor Gainullin as a contributor; the ORCID profile page itself is a JavaScript app and could not be read, so this is an unverified lead, not confirmation.