Cambridge Acquisition Corp. (Class A) ownership disclosure: Adage Capital Management and affiliated reporting persons report beneficial ownership of 1,800,000 shares, representing 7.66% of the Class A Ordinary Shares.
The percentage is calculated using 23,495,500 Class A Ordinary Shares outstanding as of March 27, 2026. Ownership is reported as shared voting and dispositive power. The filing is a Schedule 13G and is signed May 13, 2026.
Positive
None.
Negative
None.
Insights
Adage reports a meaningful passive stake in Cambridge Acquisition.
Adage Capital Management, together with affiliated reporting persons, states beneficial ownership of 1,800,000 shares, equal to 7.66% of the outstanding Class A Ordinary Shares based on March 27, 2026. The position is disclosed as shared voting and dispositive power held through managed entities.
Because this is a Schedule 13G, the filing is presented as an investment manager disclosure rather than an activist Schedule 13D; subsequent filings would clarify intent or changes in ownership magnitude.
Filing clarifies attribution and control structure behind the stake.
The statement attributes shares to Adage Capital Partners, L.P. and identifies Robert Atchinson and Phillip Gross as managing members of the manager entities that exercise shared power. The joint filing agreement is included as Exhibit 99.1.
Stakeholders may watch for any change-of-intent filings or amendments if Adage increases voting influence or converts passive holdings into coordinated actions.
Key Figures
Shares beneficially owned:1,800,000 sharesPercent of class:7.66%Shares outstanding (used for calc):23,495,500 shares+2 more
5 metrics
Shares beneficially owned1,800,000 sharesreported for Adage and affiliated reporting persons
Percent of class7.66%of Class A Ordinary Shares
Shares outstanding (used for calc)23,495,500 sharesas of March 27, 2026 (Company Form 10-K)
CUSIPG1871M108Class A Ordinary Shares identifier
Filing signature date05/13/2026date signatures were executed on the Schedule 13G
"This statement is filed by: (i) Adage Capital Management, L.P."
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.
beneficial ownershipfinancial
"Amount beneficially owned: The information required by Item 4(a)"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
shared dispositive powerregulatory
"Shared Dispositive Power 1,800,000.00"
Joint Filing Agreementlegal
"Exhibit 99.1: Joint Filing Agreement"
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, par value $0.0001 per share
(Title of Class of Securities)
G1871M108
(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):
G1871M108
1
Names of Reporting Persons
Adage Capital Management, L.P.
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
1,800,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,800,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,800,000.00
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)
7.66 %
12
Type of Reporting Person (See Instructions)
IA, PN
SCHEDULE 13G
CUSIP Number(s):
G1871M108
1
Names of Reporting Persons
Robert Atchinson
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,800,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,800,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,800,000.00
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)
7.66 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
CUSIP Number(s):
G1871M108
1
Names of Reporting Persons
Phillip Gross
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,800,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,800,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,800,000.00
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)
7.66 %
12
Type of Reporting Person (See Instructions)
HC, IN
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:
This statement is filed by:
(i) Adage Capital Management, L.P., a Delaware limited partnership ("ACM"), as the investment manager of Adage Capital Partners, L.P., a Delaware limited partnership ("ACP"), with respect to the Class A Ordinary Shares, par value $0.0001 per share ("Class A Ordinary Shares") of Cambridge Acquisition Corp., a Cayman Islands exempted company (the "Company") directly held by ACP;
(ii) Robert Atchinson ("Mr. Atchinson"), as (1) managing member of Adage Capital Advisors, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACA"), managing member of Adage Capital Partners GP, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACPGP"), general partner of ACP, and (2) managing member of Adage Capital Partners, L.L.C., a Delaware limited liability company ("ACPLLC"), general partner of ACM, with respect to the Class A Ordinary Shares directly held by ACP; and
(iii) Phillip Gross ("Mr. Gross"), as (1) managing member of ACA, managing member of ACPGP, and (2) managing member of ACPLLC, general partner of ACM, with respect to the Class A Ordinary Shares directly held by ACP.
The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party.
The filing of this statement should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of the securities reported herein.
(b)
Address or principal business office or, if none, residence:
The address of the business office of each of the Reporting Persons is 200 Clarendon Street, 52nd Floor, Boston, Massachusetts 02116.
(c)
Citizenship:
ACM is a limited partnership organized under the laws of the State of Delaware. Messrs. Gross and Atchinson are citizens of the United States.
(d)
Title of class of securities:
Class A Ordinary Shares, par value $0.0001 per share
(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).
Item 4.
Ownership
(a)
Amount beneficially owned:
The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 23,495,500 Class A Ordinary Shares outstanding as of March 27, 2026, as reported in the Company's Annual Report on Form 10-K for the year ended December 31, 2025, filed with the Securities and Exchange Commission on March 27, 2026.
(b)
Percent of class:
7.66%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(ii) Shared power to vote or to direct the vote:
The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iii) Sole power to dispose or to direct the disposition of:
The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iv) Shared power to dispose or to direct the disposition of:
The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
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.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
See Item 2(a).
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.
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.
Adage Capital Management, L.P.
Signature:
/s/ Robert Atchinson
Name/Title:
By: Adage Capital Partners, L.L.C., its General Partner, By: Robert Atchinson, its Managing Member
What stake does Adage hold in Cambridge Acquisition (CAQ)?
Adage reports beneficial ownership of 1,800,000 shares, equal to 7.66% of Class A Ordinary Shares. The percentage uses 23,495,500 shares outstanding as of March 27, 2026 from the company's Form 10-K.
How is Adage's ownership structured in the Schedule 13G for CAQ?
Ownership is reported through affiliated entities: Adage Capital Management, L.P. and related partnerships, with shared voting and dispositive power. The filing attributes control to specified managing members rather than individual sole power.
Does the Schedule 13G indicate Adage is an activist investor in CAQ?
No. The filing is a Schedule 13G, which typically indicates a passive or investment-manager reporting status rather than activist intent. Any change to activist intent would normally be reported by an amended filing or Schedule 13D.
What date and references anchor the ownership percentage reported?
The 7.66% figure is calculated using 23,495,500 Class A Ordinary Shares outstanding as of March 27, 2026, as reported in the company's Annual Report on Form 10-K filed March 27, 2026.
Who signed the filing for Adage's CAQ disclosure?
The Schedule 13G is signed by Robert Atchinson and Phillip Gross, with signatures dated May 13, 2026, and includes a Joint Filing Agreement as Exhibit 99.1.
