X0609 4 2026-03-16 0001699963 Neutron Holdings, Inc. LIME 0002069613 Ting Wayne Hsing-Yuan false C/O NEUTRON HOLDINGS, INC. 444 TOWNSEND STREET, FL 1 SAN FRANCISCO CA 94107 true true Chief Executive Officer false Common Stock 2026-03-16 4 D 0 23266 D 559667 D Common Stock 2026-06-30 4 F 0 27201 25 D 532466 D Common Stock 2026-07-02 4 S 0 99115 25 D 433351 D This transaction occurred prior to the Issuer's registration of a class of equity securities under Section 12 of the Securities Exchange Act of 1934, as amended, in connection with the Issuer's initial public offering, and is reported herein pursuant to Rule 16a-2(a). On March 16, 2026, the Issuer repurchased 23,266 shares of the Reporting Person's Common Stock at the fair market value of the Issuer's Common Stock as of March 16, 2026 (for an aggregate purchase price of $889,650) as repayment for the Reporting Person's promissory note. Represents shares of Common Stock withheld by the Issuer for payment of taxes on vesting of restricted stock units; not an open market transaction. /s/ Susie Giordano, Attorney-in-Fact 2026-07-02