[SCHEDULE 13G/A] Mountain & Co. I Acquisition Corp. Unit SEC Filing

Rhea-AI Filing Summary

The Schedule 13G/A states that W. R. Berkley Corporation and Berkley Insurance Company report no beneficial ownership of Mountain & Co. I Acquisition Corp. Class A ordinary shares (par value $0.0001), CUSIP G6301J104. Both reporting persons are organized in Delaware and list a principal address at 475 Steamboat Road, Greenwich, CT. The aggregate amount beneficially owned is reported as 0.00 shares, representing 0% of the class, with all voting and dispositive power entries shown as 0.00.

The filing records that ownership is 5% or less and includes the required certification that the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer. The statement is signed by Richard M. Baio in his corporate officer capacities.

Insights

Financial Analyst

TL;DR: Berkley entities report zero beneficial ownership of MCAAU, a routine disclosure with no material effect on ownership or control.

The filing confirms that both W. R. Berkley Corporation and Berkley Insurance Company hold 0.00 shares (0%) of Mountain & Co. I Class A shares (CUSIP G6301J104). For investors, this is a neutral, informational filing: it neither adds to nor subtracts from market ownership concentration and does not signal an intent to influence corporate control. The document also contains the standard certification that holdings are in the ordinary course of business, reducing concerns about activist intent.

Corporate Governance Expert

TL;DR: Disclosure shows no stake and confirms Berkley entities are not participants in issuer control or governance actions.

The Schedule 13G/A lists the reporting persons as Delaware entities and reports aggregate beneficial ownership of 0.00 shares (0%). Item 5 states ownership is 5% or less and Item 6 is noted as not applicable. The filing references the usual exhibits for subsidiary identification where relevant. From a governance standpoint, the filing documents absence of influence or voting power by these reporting entities.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

MOUNTAIN & CO. I ACQUISITION CORP.

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G6301J104

(CUSIP Number)

06/30/2025

(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)

SCHEDULE 13G

CUSIP No. G6301J104

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP No. G6301J104

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IC, CO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MOUNTAIN & CO. I ACQUISITION CORP.
(b)	Address of issuer's principal executive offices: 4001 Kennett Pike, Suite 302 Wilmington, Delaware 19807
Item 2.
(a)	Name of person filing: The information required by Item 2(a) is set forth in Row 1 of the cover page hereto for each Reporting Person and is incorporated herein by reference for each such Reporting Person.
(b)	Address or principal business office or, if none, residence: The address of each Reporting Person is: 475 Steamboat Road Greenwich, CT 06830
(c)	Citizenship: The information required by Item 2(c) is set forth in Row 4 of the cover page hereto for each Reporting Person and is incorporated herein by reference for each such Reporting Person.
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP No.: G6301J104
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: The information required by Items 4(a)-(c) is set forth in Rows 5-11 of the cover page hereto for each Reporting Person and is incorporated herein by reference for each such Reporting Person.
(b)	Percent of class:
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote:
	(ii) Shared power to vote or to direct the vote:
	(iii) Sole power to dispose or to direct the disposition of:
	(iv) Shared power to dispose or to direct the disposition of:
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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:	By: /s/ Richard M. Baio
Name/Title:	Richard M. Baio, Executive Vice President and Chief Financial Officer
Date:	08/08/2025

Berkley Insurance Company

Signature:	By: /s/ Richard M. Baio
Name/Title:	Richard M. Baio, Executive Vice President and Treasurer
Date:	08/08/2025

FAQ

What does the Schedule 13G/A say about MCAAU ownership?

The filing states that W. R. Berkley Corporation and Berkley Insurance Company beneficially own 0.00 shares, representing 0% of Mountain & Co. I Class A ordinary shares.

Which securities are covered in this filing for MCAAU?

The filing covers Class A ordinary shares, par value $0.0001 per share, CUSIP G6301J104.

Who are the reporting persons in the Schedule 13G/A for MCAAU?

The reporting persons are W. R. Berkley Corporation and Berkley Insurance Company, each organized in Delaware with a listed address of 475 Steamboat Road, Greenwich, CT.

Does the filing indicate a holding of 5% or more in MCAAU?

No. Item 5 of the filing indicates ownership of 5 percent or less of the class.

Who certified the Schedule 13G/A for the Berkley entities?

The filing is signed and certified by Richard M. Baio in his corporate officer capacities for the reporting entities.