Sunshine Silver Mining & Refining Company completed its initial public offering by selling 23 million shares at $13.50 apiece, producing roughly $310.5 million in gross proceeds prior to the deduction of underwriting fees and other offering-related expenses, the company said.
The underwriters fully exercised their over-allotment option, expanding the size of the sale to the amount reported. Sunshine Silver's common stock commenced trading on the New York Stock Exchange on June 4, 2026, under the symbol SSMR.
Leading the transaction as joint lead book-running managers were Morgan Stanley, Scotiabank and BMO Capital Markets. Additional underwriting roles were filled by Canaccord Genuity, Citigroup and RBC Capital Markets, who served as joint bookrunners for the offering.
Regulatory steps for the offering were completed when the Securities and Exchange Commission declared the registration statement effective on June 3, 2026. The prospectus detailing the terms of the offering has been filed with the SEC as part of that process.
Sunshine Silver operates in Idaho's Coeur d'Alene Mining District and has stated its intention to return the historic Sunshine Mine to production. The company characterizes its operations as a vertically integrated mine-to-mill-to-refinery platform, noting the presence of an onsite silver refinery and permits that allow for antimony production.
This capital raise provides Sunshine Silver with gross proceeds before fees and expenses that the company can apply to its stated operational and development plans. The exact net proceeds available to the company will be reduced by underwriting fees and offering-related expenses, as disclosed in the offering documents.
With trading under the SSMR ticker now active on the NYSE, the company has completed the principal components of its public listing: registration effectiveness, prospectus filing and the start of secondary market trading following allocation and the exercise of the over-allotment option.
Contextual note: The company has framed its strategy around reactivating the Sunshine Mine and integrating downstream refining capabilities, including antimony production as permitted onsite. Details on how the gross proceeds will be allocated were outlined in the prospectus filed with the SEC.