[Form 4/A] Cambridge Acquisition Corp. Amended Insider Trading Activity

Rhea-AI Filing Summary

Cambridge Acquisition Corp. reported that Cambridge Sponsor LLC bought 495,500 Class A ordinary shares indirectly in connection with 495,500 private placement units, each purchased at $10 per unit. Each unit includes one Class A ordinary share and one-third of a warrant, with each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share.

Insider Trade Summary

Net Buyer: 495,500 shares ($4,955,000)

Net Buy 1 txn

Insider Cam-Phung Michael Tam, Cambridge Sponsor LLC

Role Director, 10% Owner | 10% Owner

Bought 495,500 shs ($4.96M)

Type	Security	Shares	Price	Value
Purchase	Class A Ordinary Shares	495,500	$10.00	$4.96M

Holdings After Transaction: Class A Ordinary Shares — 495,500 shares (Indirect, See footnote)

Footnotes (1)

1. Reflects the 495,500 Class A ordinary shares of Cambridge Acquisition Corp. (the "Issuer") that are included in the 495,500 private placement units of the Issuer purchased by Cambridge Sponsor LLC ("Sponsor"). Each private placement unit was purchased for $10 per unit and consists of one Class A ordinary share and one-third of a warrant, each whole warrant exercisable into one Class A ordinary share at an exercise price of $11.50 per ordinary share. The Sponsor is the record holder of such shares. Michael Cam- Phung, as the managing member of the Sponsor, holds voting and investment discretion with respect to the ordinary shares held of record by the Sponsor. As such, Mr. Cam- Phung may be deemed to have beneficial ownership of the securities held of record by the Sponsor. Mr. Cam- Phung disclaims any beneficial ownership of the securities held by the Sponsor other than to the extent of any pecuniary interest he may have therein, directly or indirectly. Excludes 7,666,667 Class B ordinary shares of the Issuer held by the Sponsor acquired pursuant to a subscription agreement by and between the Issuer and the Sponsor.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Cam-Phung Michael Tam

(Last) (First) (Middle)

C/O CAMBRIDGE ACQUISITION CORP

ONE LIBERTY SQUARE, 13TH FL

(Street)

BOSTON MA 02109

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Cambridge Acquisition Corp. [ CAQ ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
02/09/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)
02/10/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Ordinary Shares	02/09/2026	02/09/2026	P		495,500(1)	A	$10	495,500(1)	I(3)	See footnote(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

Cam-Phung Michael Tam

(Last) (First) (Middle)

C/O CAMBRIDGE ACQUISITION CORP

ONE LIBERTY SQUARE, 13TH FL

(Street)

BOSTON MA 02109

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Cambridge Sponsor LLC

(Last) (First) (Middle)

ONE LIBERTY SQUARE, 13TH FL

(Street)

BOSTON MA 02109

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. Reflects the 495,500 Class A ordinary shares of Cambridge Acquisition Corp. (the "Issuer") that are included in the 495,500 private placement units of the Issuer purchased by Cambridge Sponsor LLC ("Sponsor"). Each private placement unit was purchased for $10 per unit and consists of one Class A ordinary share and one-third of a warrant, each whole warrant exercisable into one Class A ordinary share at an exercise price of $11.50 per ordinary share.

2. The Sponsor is the record holder of such shares. Michael Cam- Phung, as the managing member of the Sponsor, holds voting and investment discretion with respect to the ordinary shares held of record by the Sponsor. As such, Mr. Cam- Phung may be deemed to have beneficial ownership of the securities held of record by the Sponsor. Mr. Cam- Phung disclaims any beneficial ownership of the securities held by the Sponsor other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

3. Excludes 7,666,667 Class B ordinary shares of the Issuer held by the Sponsor acquired pursuant to a subscription agreement by and between the Issuer and the Sponsor.

Remarks:

This Form 4/A amends the Form 4 filing dated February 10, 2026 (the "Original Form 4") solely to add Cambridge Sponsor LLC (the "Sponsor") as an additional Reporting Person. Although Sponsor was disclosed in the Original Form 4, it was not included as a Reporting Person because it did not have codes for the EDGAR system at such time. Other than including the Sponsor as additional reporting persons, this form contains no amendment to the Original Form 4.

	/s/ Cambridge Sponsor LLC	03/05/2026
	/s/ Michael Cam- Phung	03/05/2026
	** Signature of Reporting Person	Date
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