Jaime Vieser - 11 Jun 2026 Form 4 Insider Report for Mountain Lake Acquisition Corp. (MLAC)

Reporting relationship: Director
Issuer ticker: MLAC
Reported as of: 11 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 Jun 2026, 16:15:55 UTC
Prior SEC filing: 04 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Jaime Vieser

Key filing fact

Jaime Vieser filed Form 4 for Mountain Lake Acquisition Corp. (MLAC) on 15 Jun 2026.

Key facts

This page summarizes Jaime Vieser's Form 4 filing for Mountain Lake Acquisition Corp. (MLAC).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 15 Jun 2026, 16:15.

Change

Previous filing in this sequence was filed on 04 Jun 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001846045 Primary reporting owner

Vieser Jaime

Relationship: Director
Address: C/O MOUNTAIN LAKE ACQUISITION CORP., 930 TAHOE BLVD STE 802 PMB 45, INCLINE VILLAGE
Signature: /s/ Jaime Vieser
Signature date: 15 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MLAC transaction

Class A ordinary shares, par value $0.0001 per share

Disposed to Issuer

Transaction value
Shares: -478,010
Change %: -100%
Price
Shares after: 0
Date: 11 Jun 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MLAC transaction Derivative

Class B ordinary shares, par value $0.0001 per share

Options Exercise

Transaction value
Shares: -478,010
Change %: -100%
Price
Shares after: 0
Date: 11 Jun 2026
Ownership: Direct
Underlying class: Class A ordinary shares
Underlying amount: 478,010
Exercise price
Footnotes: F1, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Jaime Vieser is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 3 footnotes

Footnote F1

As described in the registration statement on Form S-1 (File No. 333-281410) of the Issuer under the heading "Description of Securities--Founder Shares," the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments.

Footnote F2

In connection with the SPAC Merger (as defined in the Business Combination Agreement), an aggregate of 478,010 Class A ordinary shares held by the Reporting Person were exchanged into an equal number of shares of Class A common stock, par value $0.01 per share, of Pubco. Following such transaction, the Reporting Person owns zero Class A ordinary shares.

Footnote F3

On June 11, 2026, in connection with the consummation of the transactions contemplated by the Business Combination Agreement dated October 1, 2025 (as amended on January 13, 2026 and March 17, 2026, the "Business Combination Agreement" and the transactions contemplated thereto, the "Business Combination"), by and among the Issuer, Avalanche Treasury Corporation, a Delaware corporation ("Pubco") and the other parties thereto, 478,010 Class B ordinary shares were converted into an aggregate of 478,010 Class A ordinary shares (the "Class B Conversion"). Following the Class B Conversion, the Reporting Person owns zero Class B ordinary shares.