# EDGAR Filing Document

**Accession Number:** 0002068027
**File Stem:** 0001829126-25-006073
**Filing Date:** 2025-8
**Character Count:** 5380
**Document Hash:** 6cdac0a67e805f78a295051cd179f41f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001829126-25-006073.hdr.sgml**: 20250811

**ACCESSION NUMBER**: 0001829126-25-006073

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250805

**FILED AS OF DATE**: 20250811

**DATE AS OF CHANGE**: 20250811

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Whiteowl Holdings LLC
- **CENTRAL INDEX KEY:** 0002068027

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42787
- **FILM NUMBER:** 251203466

**BUSINESS ADDRESS:**
- **STREET 1:** 1185 6TH AVE, SUITE 304
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036
- **BUSINESS PHONE:** 2126121400

**MAIL ADDRESS:**
- **STREET 1:** 1185 6TH AVE, SUITE 304
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Quantumsphere Acquisition Corp
- **CENTRAL INDEX KEY:** 0002070900
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 0331

**BUSINESS ADDRESS:**
- **STREET 1:** 1185 6TH AVE.
- **STREET 2:** SUITE 304
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036
- **BUSINESS PHONE:** 212-612-1400

**MAIL ADDRESS:**
- **STREET 1:** 1185 6TH AVE.
- **STREET 2:** SUITE 304
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036

### 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>Whiteowl Holdings LLC<br><sub>(Last) (First) (Middle)</sub><br>WHITEOWL HOLDINGS LLC 1201<br>ORANGE STREET, SUITE 600, WILMINGTON<br><sub>(Street)</sub><br>DELAWARE, DE 19801<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Quantumsphere Acquisition Corp [ QUMSU ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-05 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] 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 |
| Ordinary Shares, par value $0.0001 per share | 3126650<sup>(1)</sup> | D<sup>(1)</sup> |  |

---

## 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 |
| Rights | <sup>(2)</sup> | <sup>(2)</sup> | Ordinary Shares | 32664<sup>(2)</sup> | <sup>(2)</sup> | D |  |

---

### Footnotes:

(1) Includes 2,898,000 ordinary shares of the Issuer acquired by Whiteowl Holdings LLC prior to the Issuer 's initial public offering. As a result of the underwriter's full exercise of its over-allotment option to purchase 1,080,000 units on August 7, 2025, no such shares are subject to forfeiture. Also includes 228,650 ordinary shares underlying the private placement units sold in a private placement conducted simultaneously with the Issuer 's initial public offering.

(2) Includes 228,650 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-seventh of one ordinary share upon the completion of the Issuer 's initial business combination.

**Signature:** /s/ Ping Zhang, Managing Member of Whiteowl Holdings LLC  
**Date:** 2025-08-11

### 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.**