Form 8-K
8-K — Sunshine Silver Mining & Refining Co
Accession: 0001628280-26-062615
Filed: 2026-09-18
Period: 2026-09-18
CIK: 0002091017
SIC: 1040 (GOLD & SILVER ORES)
Item: Regulation FD Disclosure
Item: Financial Statements and Exhibits
Documents
8-K — ssmr-20260918.htm (Primary)
EX-99.1 (ssmr_gdxjinclusionxvf.htm)
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8-K
8-K (Primary)
Filename: ssmr-20260918.htm · Sequence: 1
ssmr-20260918
FALSE000209101700020910172026-09-182026-09-18
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): September 18, 2026
SUNSHINE SILVER MINING & REFINING COMPANY
(Exact name of Registrant as Specified in Its Charter)
Delaware 001-43325 85-3794822
(State or Other Jurisdiction
of Incorporation)
(Commission File Number)
(IRS Employer
Identification No.)
2209 Big Creek Rd
Kellogg, Idaho
83837
(Address of Principal Executive Offices) (Zip Code)
Registrant’s Telephone Number, Including Area Code: (208) 783-1700
Not Applicable
(Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each class Trading Symbol(s) Name of each exchange on which registered
common stock, par value $0.001 per share SSMR New York Stock Exchange
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).
Emerging growth company ☑
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 7.01 Regulation FD Disclosure.
On September 18, 2026, Sunshine Silver Mining & Refining Company issued a press release announcing its inclusion in the VanEck Junior Gold Miners ETF. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.
The information included herein and in Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
Exhibit No. Description
99.1
Press Release dated September 18, 2026
104 Cover Page Interactive Data File (embedded within the Inline XBRL document)
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
SUNSHINE SILVER MINING & REFINING COMPANY
Date: September 18, 2026 By: /s/ Michelle Shepston
Michelle Shepston
General Counsel
EX-99.1
EX-99.1
Filename: ssmr_gdxjinclusionxvf.htm · Sequence: 2
Document
Sunshine Silver Mining & Refining Announces Inclusion in the VanEck Junior Gold Miners ETF
KELLOGG, Idaho, September 18, 2026 -- Sunshine Silver Mining & Refining Company (the "Company" or "Sunshine") (NYSE:SSMR), a mining company advancing the next chapter of American silver, today announced that its common stock will be added to the VanEck Junior Gold Miners ETF (“GDXJ”) effective at market close on September 18, 2026.
The addition comes only three months after Sunshine completed its initial public offering and began trading on the New York Stock Exchange on June 4, 2026, reflecting the Company’s growing presence as a publicly traded silver equity.
“Inclusion in GDXJ constitutes an important milestone for Sunshine and, we believe, will introduce our story to an even broader group of precious metals investors,” said Heather White, Chief Executive Officer. “As our presence in the public markets expands, our focus remains on disciplined execution and advancing the Sunshine Mine toward a planned return to production in late 2028.”
GDXJ is a widely recognized exchange-traded fund that provides investors with exposure to a portfolio of small- and mid-capitalization companies across the global gold and silver mining sectors. Sunshine’s inclusion is expected to increase its visibility among both institutional and retail investors, expand passive ownership and support trading liquidity.
For more information on the GDXJ, please visit: https://www.vaneck.com/us/en/investments/junior-gold-miners-etf-gdxj/overview/.
About Sunshine Silver Mining & Refining Company
Sunshine Silver Mining & Refining Company is advancing toward silver production from the Sunshine Mine in Idaho’s Silver Valley, the most prolific silver district in U.S. history. The Sunshine Mine is North America’s highest-grade primary silver resource. It is characterized by exceptional size, extraordinary growth potential, existing infrastructure, and a history of proven production. Sunshine, the largest holder of mineral rights in the Silver Valley, also controls a consolidated land position with significant exploration potential and is evaluating additional value opportunities through silver/copper refining and antimony production. For more information, visit www.sunshinesilvermining.com.
Contacts
Investor Relations
ir@silveropp.com
1
Media Relations
ssmr@fleishman.com
Cautionary Statements
This press release contains forward-looking statements, including statements regarding the Company’s planned return to production in late 2028 and the expected benefits of Sunshine’s inclusion in the GDXJ. In some cases, forward-looking statements can be identified by words such as “anticipate,” “believe,” “continue,” “estimate,” “expect,” “intend,” “may,” “will,” “could,” “predict” and similar expressions or terminology. These statements are not historical facts but rather are based on the Company's current expectations and projections regarding its business, operations and other factors relating thereto and are subject to a number of known and unknown risks, uncertainties and other factors, including the risk factors set forth in our registration statement on Form S-1 filed with the Securities and Exchange Commission (“SEC”) and other filings that we make from time to time with the SEC, that may cause the actual results, levels of activity, performance or achievements of the Company to be materially different from those expressed or implied by any forward-looking statements. Except to the extent required by law, the Company assumes no obligation to update any of these forward-looking statements or to conform these statements to actual results or revised expectations. We caution you not to place undue reliance on these forward-looking statements.
2
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