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

Reporting relationship: 10%+ Owner
Issuer ticker: MLAC
Reported as of: 11 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 Jun 2026, 16:17:27 UTC
Prior SEC filing: 10 Jun 2026
Source filing: View source filing
Reporting owner signature: Signed by Managing Member of Mountain Lake Acquisition Sponsor LLC /s/ Douglas Horlick

Key filing fact

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

Key facts

This page summarizes Mountain Lake Acquisition Sponsor LLC'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, 16:17.

Change

Previous filing in this sequence was filed on 10 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 0002047890 Primary reporting owner

Mountain Lake Acquisition Sponsor LLC

Relationship: 10%+ Owner
Address: C/O MOUNTAIN LAKE ACQUISITION CORP., 930 TAHOE BLVD STE 802 PMB 45, INCLINE VILLAGE
Signature: Signed by Managing Member of Mountain Lake Acquisition Sponsor LLC /s/ Douglas Horlick
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: -495,000
Change %: -100%
Price
Shares after: 0
Date: 11 Jun 2026
Ownership: Direct
Footnotes: F1

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

Disposed to Issuer

Transaction value
Shares: -4,355,724
Change %: -100%
Price
Shares after: 0
Date: 11 Jun 2026
Ownership: Direct
Underlying class: Class A ordinary shares
Underlying amount: 4,355,724
Exercise price
Footnotes: F1, F2

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

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Mountain Lake Acquisition Sponsor LLC is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 2 footnotes

Footnote F1

On June 11, 2026, in connection with the consummation of the transactions contemplated by the Business Combination Agreement dated as of 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 ("Pubco"), and the other parties thereto, and certain Sponsor Support Agreement dated as of October 1, 2025, by and among the Issuer, Pubco and Mountain Lake Acquisition Sponsor LLC (the "Sponsor"), an aggregate of 4,355,724 Class B ordinary shares and 495,000 private placement units held by Mountain Lake Acquisition Sponsor LLC (the "Sponsor") were surrendered for cancellation by the Sponsor to the Issuer for no consideration. Following the surrender, the Sponsor owns zero ordinary shares.

Footnote F2

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 shares of Class B Ordinary Shares will automatically convert into shares of 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.