0001537435-25-000092 Sample Contracts

TECOGEN INC. UNDERWRITING AGREEMENT 3,500,000 Shares of Common Stock
Underwriting Agreement • July 18th, 2025 • Tecogen Inc. • Air-cond & warm air heatg equip & comm & indl refrig equip • New York

Tecogen Inc., a Delaware corporation (the “Company”), proposes, subject to the terms and conditions stated herein, to issue and sell to the underwriters named in Schedule I hereto (the “Underwriters,” or each, an “Underwriter”), for whom Roth Capital Partners, LLC is acting as the representative (the “Representative”), 3,500,000 authorized but unissued shares (the “Firm Shares”) of common stock of the Company, par value $.001 per share (the “Common Stock”). In addition, the Company also proposes to sell to the Underwriters, upon the terms and conditions set forth in Section 4 hereof, up to an additional 485,000 authorized but unissued shares of Common Stock (the “Option Shares”). The Firm Shares and the Option Shares are hereinafter collectively referred to as the “Shares” or “Securities.”