The HBS European Alumni Summit 2026 runs 25-27 September 2026 in Amsterdam, hosted by the Harvard Business School Club of the Netherlands, under the theme 'Leadership for One World'. A sister HBS alumni club's own event listing (HBS Club de France) publishes the dates, the city, the theme and the host club, and records the venue as still to be determined; the host club's summit domain (hbsnl.com) answers with a redirect to an iModules alumni sign-in, i.e. the summit surface is members-only and no public venue or speaker list is exposed. The programme is described by the clubs as keynotes, cross-sector panels and interactive sessions addressing how leaders navigate geopolitical, technological and social disruption, with a cultural programme alongside. The summit is the European series' next stop after Berlin (2017), Paris (2022) and Milan (2024). Access is alumni-facing and ticketed; no delegate roster, no speaker list and no ticket price are published. Nothing on this page is an attendance list, and no figure here is a deal, a commitment, an AUM or a net-worth claim.
Day-of venue photograph, 26 September 2026: the group at the HBS European Alumni Summit 2026 with the summit's own banner — 'Leadership For One World · HBS European Alumni Summit · Amsterdam 2026' — and the HBS shield, both legible in frame. Published by the HBS-alumni attendee @KojiroMoriwaka (post 2103754743688663134, 2026-09-26 07:53 GMT). Re-hosted on our own origin with the UnicornsMap.com $UM-Radar watermark bottom-right, off the faces. Single-publisher frame: it is NOT an attendance list and no person other than the named publisher is identified.Day-of venue photograph, 26 September 2026: two attendees in summit lanyards reading 'HBS EUROPEAN ALUMNI SUMMIT · AMSTERDAM', in a grand Amsterdam hall. Published by @KojiroMoriwaka (post 2103770005435453876, 2026-09-26 08:53 GMT) with a caption naming the event series. Re-hosted on our own origin with the UnicornsMap.com $UM-Radar watermark bottom-right, off the faces. Single publisher; the second person in frame is an unnamed delegate and is deliberately not identified — no private-guest doxx, no name inference.Day-of venue photograph, 26 September 2026: summit attendees networking in an art-gallery room holding Old Master paintings, part of the weekend's cultural programme. Published by @KojiroMoriwaka (post 2103710423086481436, 2026-09-26 04:57 GMT). Re-hosted on our own origin with the UnicornsMap.com $UM-Radar watermark bottom-right, off the faces. Single publisher. The venue is NOT asserted: the host club publishes no venue, so the room is described only as what is visible, not named as a museum.
🧑 公開アジェンダ登壇者（OSINT検証済み、信頼度 HIGH）
John Kojiro MoriwakaCEO & founder — family-office / VC / PE advisor; HBS alumnus (PLD)Silicon Valley Ventures (Tokyo)
