Berkley (MLAC) reports 1,877,833 shares, 7.9% stake in Mountain Lake

Rhea-AI Filing Summary

W. R. Berkley Corporation reported beneficial ownership of 1,877,833 Class A ordinary shares of Mountain Lake Acquisition Corp., representing 7.9% of the class. The filing states Berkley holds no sole voting or dispositive power and reports shared voting and dispositive power over the 1,877,833 shares. The filing is signed by Richard M. Baio as Executive Vice President and Chief Financial Officer/Treasurer.

Key Figures

Beneficially owned shares: 1,877,833 shares Percent of class: 7.9% Sole voting power: 0 +3 more

6 metrics

Beneficially owned shares 1,877,833 shares Amount beneficially owned reported on Schedule 13G

Percent of class 7.9% Percent of Class A ordinary shares beneficially owned

Sole voting power 0 Sole power to vote reported as 0 shares

Shared voting power 1,877,833 shares Shared power to vote or direct the vote

Sole dispositive power 0 Sole power to dispose reported as 0 shares

Shared dispositive power 1,877,833 shares Shared power to dispose or direct disposition

Key Terms

Schedule 13G, beneficially owned, shared dispositive power, CUSIP

4 terms

Schedule 13G regulatory

"Item 1. (a) Name of issuer: MOUNTAIN LAKE ACQUISITION CORP."

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned financial

"Item 4. (a) Amount beneficially owned: 1,877,833"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power regulatory

"Item 4. (iv) Shared power to dispose or to direct the disposition of: 1,877,833"

CUSIP financial

"Item 2. (e) CUSIP Number(s): G6301B101"

A CUSIP is a nine-character alphanumeric code that uniquely identifies a U.S. or Canadian financial security—such as a stock, bond, or fund share—like a Social Security number for an investment. It matters to investors because brokers, exchanges and record-keepers use the CUSIP to match trades, track ownership, settle transactions and pull accurate records, reducing errors and ensuring money and securities go to the right place.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

MOUNTAIN LAKE ACQUISITION CORP.

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G6301B101

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G6301B101

1

Names of Reporting Persons

W.R. Berkley Corporation

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,877,833.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,877,833.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,877,833.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.9 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP Number(s): G6301B101

1

Names of Reporting Persons

Berkley Insurance Company

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,877,833.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,877,833.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,877,833.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.9 %

12

Type of Reporting Person (See Instructions)

CO, IC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MOUNTAIN LAKE ACQUISITION CORP.
(b)	Address of issuer's principal executive offices: 930 Tahoe Blvd STE 802 PMB 45, Incline Village, Nevada, 89451
Item 2.
(a)	Name of person filing: W. R. Berkley Corporation
(b)	Address or principal business office or, if none, residence: 475 Steamboat Road Greenwich, CT 06830
(c)	Citizenship: US
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP Number(s): G6301B101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,877,833
(b)	Percent of class: 7.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,877,833
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,877,833
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99.1
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

W.R. Berkley Corporation

Signature:	/s/ Richard M. Baio
Name/Title:	Richard M. Baio/Executive Vice President and Chief Financial Officer
Date:	05/07/2026

Berkley Insurance Company

Signature:	/s/ Richard M. Baio
Name/Title:	Richard M. Baio/Executive Vice President and Treasurer
Date:	05/07/2026

FAQ

What stake does W. R. Berkley Corporation report in MLAC?

W. R. Berkley Corporation reports beneficial ownership of 1,877,833 shares, equal to 7.9% of Class A ordinary shares. The schedule shows this stake with shared voting and dispositive power over those shares.

Who holds the voting power for the reported MLAC shares?

The filing states no sole voting power; instead Berkley reports shared voting power of 1,877,833 shares. This means Berkley shares voting authority rather than controlling votes unilaterally.

Which entity within Berkley is referenced on the Schedule 13G?

The Schedule 13G lists W. R. Berkley Corporation as the reporting person and references Berkley Insurance Company in the ownership rows, both showing shared power over 1,877,833 shares.

Who signed the Schedule 13G for Berkley (MLAC filing)?

The filing is signed by Richard M. Baio, identified as Executive Vice President and Chief Financial Officer and Treasurer, with signature dates shown as 05/07/2026.

Does the Schedule 13G indicate sole dispositive power over MLAC shares?

No; the filing shows sole dispositive power: 0 and shared dispositive power: 1,877,833, indicating Berkley does not have exclusive control over disposition of the shares.