Marquez Michael J. 4

What Happened

• Michael J. Marquez, a director of Mountain Lake Acquisition Corp. (MLAC), surrendered and converted founder shares in connection with the company's business combination. On June 11, 2026 he surrendered 15,888 Class B (founder) ordinary shares to the issuer for no consideration. Separately, 9,112 Class B shares were converted to 9,112 Class A ordinary shares and those 9,112 Class A ordinary shares were exchanged for 9,112 shares of Pubco (Avalanche Treasury Corporation) Class A common stock as part of the SPAC merger transactions. No per‑share price or cash value was reported (N/A).

Key Details

• Transaction date: June 11, 2026; Form 4 filed June 15, 2026 (appears filed after the 2‑business‑day Form 4 window).
• Actions reported: surrender/cancellation of 15,888 Class B shares (no consideration); conversion of 9,112 Class B → 9,112 Class A → 9,112 Pubco Class A common shares.
• Reported transaction codes: M (exercise/conversion of derivative) and D (disposition to issuer).
• Shares owned after transactions: 0 Class B ordinary shares and 0 Class A ordinary shares of MLAC; 9,112 Pubco Class A common shares received in the exchange.
• Footnotes: Transactions occurred under the Business Combination Agreement (and related Sponsor Support Agreement) and per the issuer’s S‑1, Class B founder shares convert one-for-one into Class A at the initial business combination; the 15,888 surrendered founder shares were cancelled for no consideration.

Context

• These actions reflect customary SPAC combination mechanics (founder share conversion, surrender/cancellation, and exchange into the surviving public company stock), not an open‑market buy or sell. No cash proceeds or market sale price were reported, and the surrender was for no consideration. The filing date is after the reported transaction date, which retail investors may note when assessing timeliness of disclosure.