Mountain Lake Acquisition Sponsor LLC 4

4 · Mountain Lake Acquisition Corp. · Filed Jun 15, 2026

AI-generated summary of this filing

Updated Jun 15, 2026

Mountain Lake (MLAC) Sponsor Cancels 4.36M Founder Shares

What Happened

Mountain Lake Acquisition Sponsor LLC (the Sponsor), a 10% owner of Mountain Lake Acquisition Corp. (MLAC), surrendered for cancellation 4,355,724 Class B ordinary shares (derivative/founder shares) and 495,000 private placement units to the issuer on June 11, 2026. The shares/units were surrendered for no consideration in connection with the consummation of the business combination. No price or cash changed hands; total value is reported as N/A. After the surrender, the Sponsor owns zero ordinary shares.

Key Details

Transaction date: June 11, 2026; Form 4 filed June 15, 2026 (appears to be filed after the typical 2-business-day window).
Dispositions: 4,355,724 Class B ordinary shares (derivative) and 495,000 private placement units surrendered to the issuer for no consideration (Disposition to issuer).
Shares owned after transaction: 0 ordinary shares.
Footnote summary: The surrender occurred as part of the Business Combination Agreement (and related Sponsor Support Agreement) tied to the issuer’s combination with Avalanche Treasury Corporation (Pubco). Class B founder shares convert one-for-one into Class A ordinary shares at the time of the initial business combination (see Form S-1 description).
Insider type: Sponsor/10% owner (institutional sponsor), not an individual executive—this is corporate reorganization activity, not a routine open-market sale.

Context

This was not an open-market sale or purchase by the sponsor but a surrender/cancellation required or permitted under the business combination and sponsor agreements; it does not directly signal typical insider buying or selling behavior. The derivative (Class B) shares referenced are founder shares that convert to Class A at the business combination, per the issuer’s registration statement.

Form 4Exit

Period: 2026-06-11

10% Owner

Transactions

Disposition to Issuer
Class A ordinary shares, par value $0.0001 per share
[F1]
2026-06-11−495,000→ 0 total
Disposition to Issuer
Class B ordinary shares, par value $0.0001 per share
[F1][F2]
2026-06-11−4,355,724→ 0 total
→ Class A ordinary shares (4,355,724 underlying)

Footnotes (2)

[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.
[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.

Signature

Signed by Managing Member of Mountain Lake Acquisition Sponsor LLC /s/ Douglas Horlick|2026-06-15

1 file