Mountain Lake Acquisition Corp.

Item 8.01 Other Events. On June 11, 2026, Mountain Lake Acquisition Corp., a Cayman Islands exempted company (the “Company”) issued a press release (the “Press Release”) announcing that its previously announced business combination with Avalanche Treasury Corporation (“AVAT”) (the “Business Combination”) was consummated. The shares of Class A common stock of AVAT, the combined company following the Business Combination, will commence trading on the Nasdaq on June 11, 2026, under the ticker symbol “AVAT.” The Business Combination was approved by MLAC’s shareholders at an extraordinary general meeting in lieu of an annual general meeting of shareholders on June 4, 2026, and all remaining closing conditions of the Business Combination were satisfied or waived among the parties as of June 11, 2026. A copy of the Press Release is attached hereto as Exhibit 99.1 and incorporated herein by reference. Forward-Looking Statements This Current Report on the Form 8-K includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the use of words such as “estimate,” “plan,” “project,” “forecast,” “intend,” “will,” “expect,” “anticipate,” “believe,” “seek,” “target” or other similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These forward-looking statements also include, but are not limited to, statements regarding estimation of the listing. These statements are based on various assumptions, whether or not identified in this press release, and on the current expectations of MLAC’s management and are not predictions of actual performance. These statements involve risks, uncertainties and other factors that may cause the actual results, levels of activity, performance, or achievements to be materially different from those expressed or implied by these forward-looking statements. Although MLAC believes that it has a reasonable basis for each forward-looking statement contained in this press release, MLAC cautions you that these statements are based on a combination of facts and factors currently known and projections of the future, which are inherently uncertain. The forward-looking statements in this press release represent the views of MLAC as of the date of this press release. Subsequent events and developments may cause those views to change. Except as may be required by law, MLAC does not undertake any duty to update these forward-looking statements.