Healthcare of Ontario Pension Plan (CAQ) reports 1.1M Cambridge Acquisition shares on 13G

Rhea-AI Filing Summary

Healthcare of Ontario Pension Plan Trust Fund, a pension plan formed as a trust under Ontario law, reports beneficial ownership of 1,100,000 Class A ordinary shares of Cambridge Acquisition Corp., a blank check company incorporated in the Cayman Islands. These shares represent 6.3% of the Class A shares outstanding, based on 17,424,866 Class A shares issued and outstanding as of May 14, 2026, as reported by the company. The pension plan has sole voting and sole dispositive power over all 1,100,000 shares and no shared voting or dispositive power.

Key Figures

Shares beneficially owned: 1,100,000 Class A ordinary shares Ownership percentage: 6.3% Shares outstanding: 17,424,866 Class A shares +2 more

5 metrics

Shares beneficially owned 1,100,000 Class A ordinary shares Beneficially owned by Healthcare of Ontario Pension Plan Trust Fund

Ownership percentage 6.3% Percentage of Cambridge Acquisition Corp. Class A shares

Shares outstanding 17,424,866 Class A shares Issued and outstanding as of May 14, 2026

Sole voting power 1,100,000 shares Shares over which the fund has sole voting power

Sole dispositive power 1,100,000 shares Shares over which the fund has sole dispositive power

Key Terms

beneficially owned, sole voting power, sole dispositive power, Schedule 13D, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned"

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 financial

"5 | Sole Voting Power 1,100,000.00"

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.

sole dispositive power financial

"7 | Sole Dispositive Power 1,100,000.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Schedule 13D regulatory

"information that would otherwise be disclosed in a Schedule 13D"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

blank check company financial

"Cambridge Acquisition Corp., a blank check company formed under the laws"

A blank check company is a publicly listed shell that raises money from investors before naming a specific business to buy or merge with, similar to handing a cashier a signed check and asking them to fill in the payee later. It matters to investors because it offers a faster, often cheaper path for private firms to become public, but carries extra risk since returns depend on the organizers’ ability to find a good deal and on limited information about the future business.

FAQ

What percentage of Cambridge Acquisition Corp. (CAQ) does Healthcare of Ontario Pension Plan own?

Healthcare of Ontario Pension Plan Trust Fund reports ownership of 6.3% of Cambridge Acquisition Corp.’s Class A ordinary shares, based on 17,424,866 shares outstanding as of May 14, 2026, with sole voting and dispositive power over all reported shares.

How many Cambridge Acquisition Corp. (CAQ) shares are held by Healthcare of Ontario Pension Plan?

Healthcare of Ontario Pension Plan Trust Fund beneficially owns 1,100,000 Class A ordinary shares of Cambridge Acquisition Corp., with sole voting and sole dispositive power over all of these shares and no shared power reported.

What is the basis for the 6.3% ownership figure in CAQ reported by Healthcare of Ontario Pension Plan?

The 6.3% ownership is calculated using 17,424,866 Class A shares issued and outstanding as of May 14, 2026, as reported in Cambridge Acquisition Corp.’s Form 10-Q for the quarter ended March 31, 2026.

Does Healthcare of Ontario Pension Plan share voting or dispositive power over CAQ shares?

No. Healthcare of Ontario Pension Plan Trust Fund reports sole voting power over 1,100,000 shares and sole dispositive power over 1,100,000 shares, with 0 shared voting or shared dispositive power in Cambridge Acquisition Corp.

What type of investor is Healthcare of Ontario Pension Plan in relation to Cambridge Acquisition Corp. (CAQ)?

Healthcare of Ontario Pension Plan Trust Fund is described as a pension plan formed as a trust under Ontario law and registered with the Financial Services Regulatory Authority of Ontario, filing a Schedule 13G as a beneficial owner of Cambridge Acquisition Corp. shares.

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Available on EDGAR 08/13/2026 - 04:01 PM Accepted by SEC EDGAR 08/13/2026 - 04:01 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Cambridge Acquisition Corp.

(Name of Issuer)

Class A Ordinary Shares, $0.0001 par value

(Title of Class of Securities)

G1871M108

(CUSIP Number)

06/30/2026

(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): G1871M108

1

Names of Reporting Persons

Healthcare of Ontario Pension Plan Trust Fund

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

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,100,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,100,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,100,000.00

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)

6.3 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: In reference to Rows 5, 7 and 9 above, amount consists of Class A ordinary shares, $0.0001 par value ("Class A Shares"), of Cambridge Acquisition Corp., a blank check company formed under the laws of the Cayman Islands (the "Issuer"). In reference to Row 11 above, percentage ownership is based on 17,424,866 Class A Shares issued and outstanding as of May 14, 2026 as reported on the Issuer's Form 10-Q for the quarter ended March 31, 2026 filed with the Securities and Exchange Commission on May 15, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Cambridge Acquisition Corp.
(b)	Address of issuer's principal executive offices: One Liberty Square, 13th FL, Boston, MA 02109
Item 2.
(a)	Name of person filing: Healthcare of Ontario Pension Plan Trust Fund
(b)	Address or principal business office or, if none, residence: 1 York Street, Suite 1900, Toronto, Ontario, Canada, M5J 0B6
(c)	Citizenship: Ontario, Canada
(d)	Title of class of securities: Class A Ordinary Shares, $0.0001 par value
(e)	CUSIP Number(s): G1871M108
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).
	A pension plan formed as a trust under the laws of Ontario, Canada and registered with the Financial Services Regulatory Authority of Ontario.
Item 4.	Ownership
(a)	Amount beneficially owned: See Item 9 on page 2.
(b)	Percent of class: See Item 11 on page 2.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See Item 5 on page 2.
	(ii) Shared power to vote or to direct the vote: See Item 6 on page 2.
	(iii) Sole power to dispose or to direct the disposition of: See Item 7 on page 2.
	(iv) Shared power to dispose or to direct the disposition of: See Item 8 on page 2.
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.
	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 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. By signing below I certify that, to the best of my knowledge and belief, the regulatory scheme applicable to a pension plan formed as a trust under the laws of Ontario, Canada and registered with the Financial Services Regulatory Authority of Ontario is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Securities and Exchange 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.

Healthcare of Ontario Pension Plan Trust Fund

Signature:	/s/ Abas Kanu
Name/Title:	Abas Kanu, VP, HOOPP Compliance Officer
Date:	08/13/2026