Picton Mahoney (CGCT) holds 1.3M Class A shares, 4.71% stake

Rhea-AI Filing Summary

CARTESIAN GROWTH CORPORATION III: Picton Mahoney Asset Management reports beneficial ownership of 1,300,000 Class A ordinary shares, representing 4.71% of the class. The filing cites a shares outstanding figure of 27,600,000 as of March 18, 2026.

Key Figures

Beneficially owned shares: 1,300,000 shares Percent of class: 4.71% Shares outstanding: 27,600,000 shares

3 metrics

Beneficially owned shares 1,300,000 shares Amount beneficially owned by Picton Mahoney

Percent of class 4.71% Percent of Class A ordinary shares owned

Shares outstanding 27,600,000 shares Class A ordinary shares outstanding as of <date>March 18, 2026</date>

Key Terms

Schedule 13G/A, Beneficially owned, Sole Voting Power

3 terms

Schedule 13G/A regulatory

"Item 1. (a) Name of issuer: CARTESIAN GROWTH CORPORATION III"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficially owned financial

"Item 4. (a) Amount beneficially owned: 1300000"

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.

Sole Voting Power corporate governance

"Item 4. (c)(i) Sole power to vote or to direct the vote: 1300000"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/27/2026 - 11:04 AM Learn about SEC filing dates

FAQ

What does Picton Mahoney's Schedule 13G/A say about CGCT ownership?

Picton Mahoney reports beneficial ownership of 1,300,000 Class A shares, equal to 4.71% of the class. The statement identifies sole voting and dispositive power over those shares and characterizes the holding as ownership of 5 percent or less.

How many Class A shares outstanding does CGCT report in the filing?

The filing cites 27,600,000 Class A ordinary shares outstanding as of March 18, 2026, per the referenced Form 10-K filed March 23, 2026. That outstanding count is used to compute the 4.71% ownership percentage.

Does Picton Mahoney report voting or dispositive power for its CGCT shares?

Yes. Picton Mahoney discloses sole voting power and sole dispositive power over 1,300,000 shares. The filing shows zero shared voting or dispositive power for these holdings.

Is Picton Mahoney's stake in CGCT an activist or control position?

The filing classifies the position as ownership of 5 percent or less and does not assert control. It lists 1,300,000 shares (4.71%) with sole voting/dispositive power but provides no language claiming control or an activist intent.

When was the Schedule 13G/A signed for Picton Mahoney's CGCT filing?

The certification is signed by the Chief Compliance Officer on April 27, 2026. The filing references the as of ownership date used for outstanding shares as March 18, 2026.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

CARTESIAN GROWTH CORPORATION III

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G19307100

(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): G19307100

1

Names of Reporting Persons

Picton Mahoney Asset Management

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

CANADA (FEDERAL LEVEL)

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,300,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,300,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,300,000.00

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)

4.71 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: Based on the Form 10-K filed March 23, 2026; as of March 18, 2026, there were 27,600,000 Class A. ordinary shares outstanding.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CARTESIAN GROWTH CORPORATION III
(b)	Address of issuer's principal executive offices: 505 Fifth Avenue, 15th Floor, New York, NEW YORK, 10017
Item 2.
(a)	Name of person filing: Picton Mahoney Asset Management
(b)	Address or principal business office or, if none, residence: 33 Yonge Street, #320, Toronto, ON M5E 1G4
(c)	Citizenship: Canada
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP No.: G19307100
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).
	Investment Fund Manager
Item 4.	Ownership
(a)	Amount beneficially owned: 1300000
(b)	Percent of class: 4.71 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1300000
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1300000
	(iv) Shared power to dispose or to direct the disposition of: 0
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.
	Not Applicable
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 foreign regulatory scheme applicable to [insert particular category of institutional investor] is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D.

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.

Picton Mahoney Asset Management

Signature:	Catrina Duong
Name/Title:	Chief Compliance Officer
Date:	04/27/2026

Comments accompanying 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.