0002088082 2026-09-17 2026-09-17 0002088082 1 2026-09-17 2026-09-17 iso4217:USD pure shares S-1 S-1MEF EX-FILING FEES 333-298617 0002088082 Electra Therapeutics, Inc. N/A N/A S-1 Electra Therapeutics, Inc. false Equity Common Stock, $0.0001 par value per share true 1916667 15.00 28750005.00 0.0001381 3970.38 28750005.00 3970.38 0.00 0.00 3970.38 The registrant previously registered securities with a proposed maximum aggregate offering price not to exceed $398,666,672 on a Registration Statement on Form S-1 (File No. 333-298617), which was declared effective by the Securities and Exchange Commission on September 17, 2026. In accordance with Rule 462(b) promulgated under the Securities Act of 1933, as amended, an additional amount of securities having a proposed maximum aggregate offering price of $28,750,005 is hereby registered, which includes the shares of common stock that the underwriters have the option to purchase.