X0708 D/A LIVE 0002114425 Haku Bio, Inc. 74 NEWPORT ST ARLINGTON MA MASSACHUSETTS 02476 2066792836 DELAWARE None None Corporation true 2026 Sandy Mong 74 Newport St. Arlington MA MASSACHUSETTS 02476 Executive Officer Director Bill Lundberg 19 Terrace Ave. Newton MA MASSACHUSETTS 02461 Director Biotechnology No Revenues 06b true 0002114425-26-000002 2026-05-22 false true Simple Agreement for Future Equity (SAFE) false 100000 2710000 1509000 1201000 Total Offering Amount includes up to $2,500,000 of new-money SAFEs plus $210,000 of SAFE issuances in exchange and cancellation of existing convertible promissory notes. false 6 0 0 0 false Haku Bio, Inc. Sandy Mong Sandy Mong, MD CEO 2026-06-10