GreenLight SPAC Presentation Deck

CBH % BW Change from Baseline (Day 0) MEAN + SEM -10- -15 GreenLight's Covid-19 vaccine candidate Immune response protects against viral challenge Hamster body weight change on virus challenge 0 1 2 3 4 5 6 7 8 9 Days Post Challenge - LNP Control - Saline Control • 100 μg - · 30 μg -.· 5 μg 10 11 12 13 14 GLB-COV-2-043 All doses of GreenLight vaccine protected hamsters against weight loss following intranasal viral challenge IC50 (1/serum dilution) Investor Presentation | © 2021 GreenLight Biosciences. All rights reserved. GreenLight confidential. Neutralizing antibody levels in hamsters 100000 10000- 1000- 100- 10- 1 ns *** Mi H 100 μg 30 μg 5 μg GLB-COV-2-043 Day 21 (Pre-Boost) Day 39 (Post-Boost) GLuc Saline Controls Our GreenLight mRNA vaccine candidate induced high levels of binding and neutralizing antibodies at all doses tested HUMAN HEALTH 25

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