AVAT

SEC source: 0001104659-26-114395 · tm2627220-2_4seq1.xml · nonDerivative · entry 1

Smith Gerald Bartholomew · CIK 0002122752 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 679,676

F1 · shares: Represents shares of Class A Common Stock withheld by the Issuer to satisfy tax withholding upon the vesting of RSUs.

SEC source: 0001104659-26-114394 · tm2627220-1_4seq1.xml · nonDerivative · entry 1

Moljo Laine Mihalchick · CIK 0002111242 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 165,623

F1 · shares: Represents shares of Class A Common Stock withheld by the Issuer to satisfy tax withholding upon the vesting of RSUs.

SEC source: 0001104659-26-112443 · tm2626701-1_4seq1.xml · nonDerivative · entry 2

Ostrower Sean William · CIK 0002125266 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 283,860

F2 · shares: Represents shares of Class A Common Stock withheld by the Issuer to satisfy tax withholding upon the vesting of RSUs.

SEC source: 0001104659-26-112444 · tm2626701-2_4seq1.xml · nonDerivative · entry 2

Moljo Laine Mihalchick · CIK 0002111242 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 181,431

F2 · shares: Represents shares of Class A Common Stock withheld by the Issuer to satisfy tax withholding upon the vesting of RSUs.

SEC source: 0001104659-26-112447 · tm2626701-3_4seq1.xml · nonDerivative · entry 2

Smith Gerald Bartholomew · CIK 0002122752 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 714,045

F2 · shares: Represents shares of Class A Common Stock withheld by the Issuer to satisfy tax withholding upon the vesting of RSUs.

SEC source: 0001104659-26-112443 · tm2626701-1_4seq1.xml · nonDerivative · entry 1

Ostrower Sean William · CIK 0002125266 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 299,401

F1 · shares: Represents a grant of restricted stock units ("RSUs") on September 28, 2026. The RSUs will vest 1/8 on each of the first eight six-month anniversaries of March 9, 2026. Each RSU represents a contingent right to receive one share of Class A common stock.

SEC source: 0001104659-26-112444 · tm2626701-2_4seq1.xml · nonDerivative · entry 1

Moljo Laine Mihalchick · CIK 0002111242 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 200,000

F1 · shares: Represents a grant of restricted stock units ("RSUs") on September 28, 2026. The RSUs will vest 1/4 on each of the first four six-month anniversaries of October 1, 2025. Each RSU represents a contingent right to receive one share of Class A common stock.

SEC source: 0001104659-26-112447 · tm2626701-3_4seq1.xml · nonDerivative · entry 1

Smith Gerald Bartholomew · CIK 0002122752 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 750,001

F1 · shares: Represents a grant of restricted stock units ("RSUs") on September 28, 2026. The RSUs will vest 1/6 on each of the first six six-month anniversaries of October 1, 2025. Each RSU represents a contingent right to receive one share of Class A common stock.

SEC source: 0001104659-26-107934 · tm2625117-3_4seq1.xml · nonDerivative · entry 2

Hadick Robert M · CIK 0002111237 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Astral Horizon, L.P.

Disclosed balance after: 2,814,771

F3 · shares: Represents shares of Class A common stock sold to the Issuer pursuant to a Stock Repurchase Agreement, dated September 14, 2026, between Astral and the Issuer (the "Stock Repurchase Agreement").

F2 · ownership.nature: Astral is managed by its general partner, Astral Horizon GP, LLC, which is governed by a board of managers consisting of four natural persons, including Mr. Hadick. The managers of Astral Horizon GP, LLC collectively have the authority to manage and control the affairs of Astral, including voting and investment decisions relating to its portfolio securities. Actions by the managers require approval of a majority of the managers, and no individual manager has authority to act unilaterally on behalf of the entity. Mr. Hadick disclaims beneficial ownership of the securities held by Astral, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001104659-26-107934 · tm2625117-3_4seq1.xml · nonDerivative · entry 1

Hadick Robert M · CIK 0002111237 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Astral Horizon, L.P.

Disclosed balance after: 2,947,167

F1 · shares: Represents shares of Class A common stock transferred from Astral Horizon, L.P., a Delaware limited partnership ("Astral"), to unaffiliated entities and one individual for no consideration.

F2 · ownership.nature: Astral is managed by its general partner, Astral Horizon GP, LLC, which is governed by a board of managers consisting of four natural persons, including Mr. Hadick. The managers of Astral Horizon GP, LLC collectively have the authority to manage and control the affairs of Astral, including voting and investment decisions relating to its portfolio securities. Actions by the managers require approval of a majority of the managers, and no individual manager has authority to act unilaterally on behalf of the entity. Mr. Hadick disclaims beneficial ownership of the securities held by Astral, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001193125-26-387992 · ownership.xml · derivative · entry 2

Gambale Virginia · CIK 0001298598 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,263

Underlying: Class A common stock · 10,751 shares

Expires 2036-09-08

F2 · derivative.exercise_date: Represents the annual award of stock options for his service as director. The annual option awards vest in full on the earlier to occur of (i) the first anniversary of the Grant Date and (ii) the first annual meeting of the Company's stockholders to occur following the Grant Date, subject to the director's continued service with the Company or an affiliate through the vesting date.

SEC source: 0001193125-26-387992 · ownership.xml · derivative · entry 1

Gambale Virginia · CIK 0001298598 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,512

Underlying: Class A common stock · 66,512 shares

Expires 2036-09-08

F1 · derivative.exercise_date: Represents the initial award of stock options for his service as director. The initial option awards vest in three equal installments during each of the first three 12-month periods following the Grant Date on the earlier to occur during each such 12-month period of (i) the anniversary of the Grant Date and (ii) the annual meeting of the Company's stockholders, subject to the director's continued service with the Company or an affiliate through the vesting date.

SEC source: 0001104659-26-103883 · tm2624352-1_4seq1.xml · derivative · entry 2

Grinberg Paul · CIK 0001303829 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 571,281

Underlying: Class A Common Stock · 26,908 shares

Expires 2036-08-27

F2 · derivative.exercise_date: Represents the annual award of stock options for his service as director. The annual option awards vest in full on the earlier to occur of (i) the first anniversary of the Grant Date and (ii) the first annual meeting of the Company's stockholders to occur following the Grant Date, subject to the director's continued service with the Company or an affiliate through the vesting date.

SEC source: 0001104659-26-103883 · tm2624352-1_4seq1.xml · derivative · entry 1

Grinberg Paul · CIK 0001303829 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 544,373

Underlying: Class A Common Stock · 66,363 shares

Expires 2036-08-27

F1 · derivative.exercise_date: Represents the initial award of stock options for his service as director. The initial option awards vest in three equal installments during each of the first three 12-month periods following the Grant Date on the earlier to occur during each such 12-month period of (i) the anniversary of the Grant Date and (ii) the annual meeting of the Company's stockholders, subject to the director's continued service with the Company or an affiliate through the vesting date.

SEC source: 0001104659-26-102057 · tm2624147-3_4seq1.xml · nonDerivative · entry 1

Hadick Robert M · CIK 0002111237 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Astral Horizon, L.P.

Disclosed balance after: 3,762,167

F1 · shares: Represents shares of Class A common stock repurchased by the Issuer to satisfy tax withholding in connection with the issuance of 2,000,000 post-closing shares to Astral Horizon, L.P., a Delaware limited partnership ("Astral") pursuant to the Business Combination Agreement (as amended) dated October 1, 2025 by and among the Issuer, Mountain Lake Acquisition Corp., a Cayman Islands exempted company, Avalanche SPAC Merger Sub LLC, a Delaware limited liability company, Avalanche Company Merger Sub LLC, a Delaware limited liability company, Avalanche Treasury Company LLC, a Delaware limited liability company, Dragonfly Digital Management, LLC, a Delaware limited liability company, Dragonfly Ventures L.P., a Cayman Islands exempted limited partnership, Dragonfly Ventures II, L.P., a Cayman Islands exempted limited partnership), and Astral.

F2 · ownership.nature: Astral is managed by its general partner, Astral Horizon GP, LLC, which is governed by a board of managers consisting of four natural persons, including Mr. Hadick. The managers of Astral Horizon GP, LLC collectively have the authority to manage and control the affairs of Astral, including voting and investment decisions relating to its portfolio securities. Actions by the managers require approval of a majority of the managers, and no individual manager has authority to act unilaterally on behalf of the entity. Mr. Hadick disclaims beneficial ownership of the securities held by Astral, except to the extent of his pecuniary interest therein, if any.

SEC source: 0001104659-26-083512 · tm2620432-2_4seq1.xml · derivative · entry 1

Smith Gerald Bartholomew · CIK 0002122752 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,700,000

Underlying: Class A common stock · 2,700,000 shares

Expires 2036-07-12

F1 · derivative.exercise_date: The option awards vest in equal installments on January 12, 2027, 2028 and 2029 subject to continued employment with Avalanche Treasury Corporation or its subsidiaries through the applicable vesting date.

SEC source: 0001104659-26-083508 · tm2620432-1_4seq1.xml · derivative · entry 1

Moljo Laine Mihalchick · CIK 0002111242 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,100,000

Underlying: Class A common stock · 1,100,000 shares

Expires 2036-07-12

F1 · derivative.exercise_date: The option awards vest in equal installments on January 12, 2027, 2028 and 2029 subject to continued employment with Avalanche Treasury Corporation or its subsidiaries through the applicable vesting date.