# EDGAR Filing Document

**Accession Number:** 0002100125
**File Stem:** 0001104659-26-008797
**Filing Date:** 2026-1
**Character Count:** 5734
**Document Hash:** 1fc65ba5b0159bcf694848d5c2c66f47
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-008797.hdr.sgml**: 20260130

**ACCESSION NUMBER**: 0001104659-26-008797

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260130

**FILED AS OF DATE**: 20260130

**DATE AS OF CHANGE**: 20260130

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Cam-Phung Michael Tam
- **CENTRAL INDEX KEY:** 0002085776

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-292147
- **FILM NUMBER:** 26585286

**MAIL ADDRESS:**
- **STREET 1:** 123 HUNTINGTON RD
- **CITY:** BRIGHTON
- **STATE:** MA
- **ZIP:** 02135
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Cambridge Acquisition Corp.
- **CENTRAL INDEX KEY:** 0002100125
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** ONE LIBERTY SQUARE, 13TH FL
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** (617) 396-4911

**MAIL ADDRESS:**
- **STREET 1:** ONE LIBERTY SQUARE, 13TH FL
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Cam-Phung Michael Tam<br><sub>(Last) (First) (Middle)</sub><br>C/O CAMBRIDGE ACQUISITION CORP<br>ONE LIBERTY SQUARE, 13TH FL<br><sub>(Street)</sub><br>BOSTON, MA 02109<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Cambridge Acquisition Corp. [ CAQ ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-01-30 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Class B Ordinary Shares | <sup>(1)</sup> | <sup>(1)</sup> | Class A Ordinary Shares | 7666667<sup>(2)</sup> | <sup>(1)</sup> | I | See Footnotes<sup>(2)(3)</sup> |

---

### Footnotes:

(1) As described in the Issuer's Registration Statement on Form S-1, as amended (File No. 333- 292147), under the heading "Description of Securities - Founder Shares," Class B ordinary shares will automatically convert into Class A ordinary shares concurrently with or immediately following the Issuer's initial business combination or earlier at the option of the holder, on a one-for-one basis, subject to certain adjustments.

(2) These shares represent the Class B ordinary shares held by Cambridge Sponsor LLC (the "Sponsor") acquired pursuant to a subscription agreement by and between the Issuer and the Sponsor. The Class B ordinary shares include up to 1,000,000 shares that are subject to forfeiture in the event the underwriters of the Issuer's initial public offering do not exercise in full their over-allotment option as described in the Issuer's registration statement.

(3) 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.

**Signature:** /s/ Michael Cam- Phung  
**Date:** 2026-01-30

**Signature:** /s/ Cambridge Sponsor LLC  
**Date:** 2026-01-30

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**