Neurology Focus and Technology - Sangamo is focused on developing genomic medicines for debilitating neurological diseases[3, 135] - The company utilizes potent zinc finger epigenetic regulation technology and an industry-leading AAV capsid discovery platform for brain delivery[4, 136] - STAC-BBB capsid has demonstrated robust penetration of the blood-brain barrier and widespread transgene expression throughout the brain in NHPs, showing up to 700-fold higher transgene expression than benchmark capsid AAV9[22, 24, 98] Pipeline and Milestones - Phase 1/2 STAND study of ST-503 for idiopathic small fiber neuropathy (iSFN) has initiated, with patient dosing expected in Fall 2025 and preliminary proof of efficacy data anticipated in Q4 2026[12, 16, 33, 38] - CTA submission for ST-506 in prion disease is anticipated as early as mid-2026, with clinical trial enrollment and dosing expected in late-2026 and preliminary clinical data in mid-2027[12, 19, 33, 38, 94] Fabry Disease Program - Positive topline results from the registrational STAAR study in Fabry disease showed a positive mean annualized eGFR slope of 1.965 mL/min/1.73m2/year at 52 weeks across all 32 dosed patients[12, 29, 33, 38, 131] - A BLA submission for isaralgagene civaparvovec is expected as early as Q1 2026, with ongoing business development negotiations for a potential commercialization agreement[12, 27, 33, 38, 130, 131] Financial Status - The company had approximately $38.3 million in cash and cash equivalents as of June 30, 2025[34, 40] - Approximately $21 million in net proceeds were raised from an underwritten registered equity offering[34, 38] - Cash received from partners to date is $88 million[25] - Up to $4.6 billion in potential future milestones and exercise fees assuming exercise of all options and targets[25]

Delivering the Future of Genomic Medicines May 2025 Forward-Looking Statements and Legal Disclaimers This presentation, and accompanying oral commentary, contains forward-looking statements regarding our current expectations. These forward-looking statements include, without limitation, statements relating to: the therapeutic and commercial potential and value of our product candidates and engineered capsids, including the ability of our zinc finger epigenetic regulators to address various neurological dise ...