Nathaniel Masfen-Yan

Nathaniel Masfen-Yan is a quantitative trader at Jane Street (registered with Jane Street Capital, LLC since September 2025) and a Stanford graduate in Mathematics and Computer Science (2021-2025). He represented New Zealand at the International Mathematical Olympiad 2020, earning an Honourable Mention (rank 395, 9 points). From 2022 to 2024 he co-founded Notebook Labs, a Web3 identity startup using zero-knowledge proofs, which raised a $3.3M round led by Bain Capital Crypto and went through Y Combinator's Summer 2022 batch; Y Combinator lists him as a former founder. He also worked as a Data Scientist at The Warehouse Group in Auckland in 2021. He attended King's College, Auckland (2016-2020).

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• Quant employment verification: CONFIRMED. Nathaniel Masfen-Yan (full legal name Nathaniel Raine Hanbury Masfen-Yan, CRD# 7930017) is registered with JANE STREET CAPITAL, LLC, New York, as a broker regulated by FINRA, registration dated 9/15/2025. Jane Street is a proprietary quantitative trading firm (market maker across equities, ETFs, options, bonds); the FINRA registration is a primary-source confirmation of actual current employment, not a student program. LinkedIn lists him as Quantitative Trader at Jane Street from 2025 and states he interned there in summer 2024. Identity is supported: matches Stanford location, IMO 2020 identity, and the Notebook Labs co-founder profile.Sep 15, 2025
• Co-founded Notebook Labs (web3 identity via zero-knowledge proofs) with Dhruv Mangtani and Solal Afota; Y Combinator lists him under 'Former Founders', and the YC page marks the company Inactive, indicating he left the venture.Oct 27, 2022
• Notebook Labs raised a $3.3M seed round led by Bain Capital Crypto (announced Oct 27, 2022), covered by The Block and CoinDesk while he was co-founder.Oct 27, 2022
• Represented New Zealand at the International Mathematical Olympiad 2020 and earned an Honourable Mention, rank 395 with 9 points (P1=1, P4=7, P5=1).Sep 2020
• Language of his own IMO report and startup coverage places his trajectory: NZ secondary school -> Stanford (2021-2025) -> founder sabbatical/academic overlap (2022-2025) -> Jane Street quant trader (2025), an unusually direct founder-to-prop-trading move.Oct 27, 2022
• Devpost portfolio (handle NathanielMY) lists the 3iD project, a privacy framework for web3 activity recording - direct evidence of hands-on crypto/zk building pre-Notebook Labs.2022
• Worked as a Data Scientist at The Warehouse Group (Auckland) in 2021, building models to guide store-relocation decisions - his earliest listed industry role, before university study-abroad research.2021
• Wrote a personal first-person report on the IMO 2020 experience for the New Zealand Maths Olympiad Committee, describing remote preparation due to COVID and the team splitting across the Cook Strait - the source of the IMO identity details.Sep 2020
• A-Venture lists him as a founder of Notebook Labs (added to profile Mar 2024, updated May 2026) and links his LinkedIn and Twitter (@natrhmy) - a cross-link hub that corroborates the handle.May 31, 2026
• Also competed in the Asian Pacific Mathematics Olympiad (APMO) for New Zealand, adding an additional olympiad track alongside the IMO.Mar 2020
• Attended King's College, Auckland 2016-2020, a private secondary school that produced the IMO team; the school's Collegian magazine covers his cohort.2020