0001193125-26-389755 Sample Contracts

• ] Shares Electra Therapeutics, Inc. UNDERWRITING AGREEMENT
Underwriting Agreement • September 14th, 2026 • Electra Therapeutics, Inc. • Biological products, (no disgnostic substances) • New York
STOCK RESTRICTION AGREEMENT
Stock Restriction Agreement • September 14th, 2026 • Electra Therapeutics, Inc. • Biological products, (no disgnostic substances) • Delaware

This Stock Restriction Agreement (the “Agreement”) is made as of , by and between Electra Therapeutics, Inc., a Delaware corporation (the “Company”) and [ ] (“Holder”). Certain capitalized terms used below are defined in the terms and conditions set forth in Exhibit A attached to this Agreement, which are incorporated by reference.

OPTION CANCELLATION AGREEMENT
Option Cancellation Agreement • September 14th, 2026 • Electra Therapeutics, Inc. • Biological products, (no disgnostic substances) • Delaware

This OPTION CANCELLATION AGREEMENT (this “Agreement”) is made and entered into on September 11, 2026, by and between Electra Therapeutics, Inc. (the “Company”) and Quehuong (Kathy) Dong, Pharm.D., M.B.A. (“Optionee”).