# EDGAR Filing Document

**Accession Number:** 0002080019
**File Stem:** 0001133099-25-000007
**Filing Date:** 2025-10
**Character Count:** 5679
**Document Hash:** 3646410a47e4ac6e5630eed2098e16e7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001133099-25-000007.hdr.sgml**: 20251008

**ACCESSION NUMBER**: 0001133099-25-000007

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251007

**FILED AS OF DATE**: 20251008

**DATE AS OF CHANGE**: 20251008

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** MACHUCA LUIS
- **CENTRAL INDEX KEY:** 0001133099

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42893
- **FILM NUMBER:** 251383421

**MAIL ADDRESS:**
- **STREET 1:** C/O COLUMBIA BANKING SYSTEM, INC.
- **STREET 2:** 1301 A STREET
- **CITY:** TACOMA
- **STATE:** WA
- **ZIP:** 98402
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GigCapital8 Corp.
- **CENTRAL INDEX KEY:** 0002080019
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 981868645
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 1731 EMBARCADERO RD., SUITE 200
- **CITY:** PALO ALTO
- **STATE:** CA
- **ZIP:** 94303
- **BUSINESS PHONE:** (650) 276-7040

**MAIL ADDRESS:**
- **STREET 1:** 1731 EMBARCADERO RD., SUITE 200
- **CITY:** PALO ALTO
- **STATE:** CA
- **ZIP:** 94303

### 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>MACHUCA LUIS<br><sub>(Last) (First) (Middle)</sub><br>C/O GIGCAPITAL8 CORP.<br>1731 EMBARCADERO RD., SUITE 200<br><sub>(Street)</sub><br>PALO ALTO, CA 94303<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>GigCapital8 Corp. [ GIW ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-10-07 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [ ] 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 |
| Class A ordinary shares | 10000<sup>(1)</sup> | D |  |

---

## 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>(3)</sup> | <sup>(3)</sup> | Class A ordinary shares | 106647<sup>(2)</sup> | <sup>(1)</sup> | D |  |
| Right | <sup>(4)</sup> | <sup>(4)</sup> | Class A ordinary shares | 2000 | <sup>(4)</sup> | D |  |

---

### Footnotes:

(1) Includes 10,000 Class A ordinary shares underlying the private placement units purchased concurrently with the initial public offering. Each private placement unit consisting of one Class A ordinary share and one right to receive one-fifth of one Class A ordinary share upon the completion of the Issuer's initial business combination.

(2) As a result of the underwriters' full exercise of the over-allotment option to purchase 3,300,000 units on October 7, 2025, no such shares are subject to forfeiture.

(3) As described in the Issuer's registration statement on Form S-1, as amended (File No.  333-289479) under the heading "Description of Securities-Ordinary Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination or earlier at the option of the holder on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.

(4) Includes 10,000 rights underlying the private placement units, which were sold in a private placement taking place simultaneously with the Issuer's initial public offering. Each right is exchangeable for one-fifth of one Class A ordinary share upon the completion of the Issuer's initial business combination.

**Signature:** /s/ Luis Machuca  
**Date:** 2025-10-08

### 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.**