# EDGAR Filing Document

**Accession Number:** 0001467761
**File Stem:** 0000898432-26-000315
**Filing Date:** 2026-5
**Character Count:** 19317
**Document Hash:** 6eb031c8100df4f1caf938b7911e4e98
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000898432-26-000315.hdr.sgml**: 20260504

**ACCESSION NUMBER**: 0000898432-26-000315

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260504

**DATE AS OF CHANGE**: 20260504

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FiEE, Inc.
- **CENTRAL INDEX KEY:** 0001467761
- **STANDARD INDUSTRIAL CLASSIFICATION:** TELEPHONE & TELEGRAPH APPARATUS [3661]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 042621506
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-85044
- **FILM NUMBER:** 26937807

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 3-33, 2-CHOME UTAJIMA
- **STREET 2:** NISHIYODOGAWA DISTRICT
- **CITY:** OSAKA
- **PROVINCE COUNTRY:** M0
- **BUSINESS PHONE:** 852-28166813

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 3-33, 2-CHOME UTAJIMA
- **STREET 2:** NISHIYODOGAWA DISTRICT
- **CITY:** OSAKA
- **PROVINCE COUNTRY:** M0

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MINIM, INC.
- **DATE OF NAME CHANGE:** 20210609

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Zoom Telephonics, Inc.
- **DATE OF NAME CHANGE:** 20090707
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Yu Cao
- **CENTRAL INDEX KEY:** 0002054128

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** ROOM 802, BUILDING 47, RONGCHENG GARDEN
- **STREET 2:** XIANGCHENG DISTRICT
- **CITY:** SUZHOU CITY, JIANGSU PROVINCE
- **STATE:** F4
- **ZIP:** 215100

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 6)**

**FiEE, Inc.**

*(Name of Issuer)*

**Common Stock, $0.01 par value**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Cao Yu**<br>Room 802, Building 47<br>Rongcheng Garden, Xiangcheng District,<br>Suzhou City F4 215100<br>86 152 5004 8607

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**04/30/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Cao Yu** | Name of reporting person<br>**Cao Yu** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CHINA** | Citizenship or place of organization<br>**CHINA** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**4615012.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**3568371.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**4615012.00** | Aggregate amount beneficially owned by each reporting person<br>**4615012.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**40.6%** | Percent of class represented by amount in Row (11)<br>**40.6%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Note to Rows 7 and 11: The above-referenced shares of common stock, $0.01 par value per share (the "Common Stock"), of FiEE, Inc. (the "Issuer") beneficially owned by Cao Yu consist of (i) 1,604,166 shares of Common Stock issuable upon conversion of 1,145,833 shares of Series A Convertible Preferred Stock, $0.001 par value per share (the "Series A Convertible Preferred Stock"), which are convertible into shares of Common Stock at a ratio of 1.4 shares of Common Stock for each share of Series A Convertible Preferred Stock (the "Ratio"), (ii) 1,425,480 shares of Common Stock issuable upon the exercise of warrants to purchase Common Stock, and (iii) 1,585,366 shares of Common Stock. The shares of Series A Convertible Preferred Stock vote on an as-converted basis without regard to the Preferred Blocker (as defined below).

Note to Row 9: The above-referenced shares of Common Stock beneficially owned by Cao Yu consist of (i) 557,525 shares of Common Stock issuable upon conversion of Series A Convertible Preferred Stock per the Ratio, (ii) 1,425,480 shares of Common Stock issuable upon the exercise of warrants to purchase Common Stock, and (iii) 1,585,366 shares of Common Stock. The shares of Series A Convertible Preferred Stock are not convertible into more than 19.99% of the number of shares of Common Stock outstanding immediately prior to the original issuance date of the Series A Convertible Preferred Stock (the "Preferred Blocker"); therefore, the Series A Convertible Preferred Stock cannot, in the aggregate, convert into more than 557,525 shares of Common Stock.

Note to Row 13: The percentages reported in this Amendment No. 6 to the Schedule 13D ("Amendment No. 6") are based on 11,358,244 shares of Common Stock deemed outstanding pursuant to Rule 13d-3(d)(1) ("Rule 13d-3(d)(1)") of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), calculated as the sum of 8,328,598 shares of Common Stock outstanding as of April 27, 2026 according to records of the Issuer, plus (i) 1,604,166 shares of Common Stock that are issuable upon conversion of the Series A Convertible Preferred Stock beneficially owned by Cao Yu and (ii) 1,425,480 shares of Common Stock that are issuable upon the exercise of warrants to purchase Common Stock beneficially owned by Cao Yu.

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Hu Bin** | Name of reporting person<br>**Hu Bin** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**2M** | Citizenship or place of organization<br>**2M** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**3125745.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**2480224.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3125745.00** | Aggregate amount beneficially owned by each reporting person<br>**3125745.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**29.5%** | Percent of class represented by amount in Row (11)<br>**29.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Note to Rows 7 and 11: The above-referenced shares of Common Stock beneficially owned by Hu Bin consist of (i) 1,203,046 shares of Common Stock issuable upon conversion of 859,319 shares of Series A Convertible Preferred Stock, which are convertible into shares of Common Stock per the Ratio, (ii) 1,069,040 shares of Common Stock issuable upon the exercise of warrants to purchase Common Stock, and (iii) 853,659 shares of Common Stock. The shares of Series A Convertible Preferred Stock vote on an as-converted basis without regard to the Preferred Blocker. 

Note to Row 9: The above-referenced shares of Common Stock beneficially owned by Hu Bin consist of (i) 557,525 shares of Common Stock issuable upon conversion of Series A Convertible Preferred Stock, (ii) 1,069,040 shares of Common Stock issuable upon the exercise of warrants to purchase Common Stock, and (iii) 853,659 shares of Common Stock. The shares of Series A Convertible Preferred Stock are subject to the Preferred Blocker; therefore, the Series A Convertible Preferred Stock cannot, in the aggregate, convert into more than 557,525 shares of Common Stock.

Note to Row 13: The percentages reported in this Amendment No. 6 are based on 10,600,684 shares of Common Stock deemed outstanding pursuant to Rule 13d-3(d)(1), calculated as the sum of 8,328,598 shares of Common Stock outstanding as of April 27, 2026 according to records of the Issuer, plus (i) 1,203,046 shares of Common Stock that are issuable upon conversion of the Series A Convertible Preferred Stock beneficially owned by Hu Bin and (ii) 1,069,040 shares of Common Stock that are issuable upon the exercise of warrants to purchase Common Stock beneficially owned by Hu Bin.

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Youxin Consulting Ltd.** | Name of reporting person<br>**Youxin Consulting Ltd.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**HONG KONG** | Citizenship or place of organization<br>**HONG KONG** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**649254.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**649254.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**649254.00** | Aggregate amount beneficially owned by each reporting person<br>**649254.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**7.2%** | Percent of class represented by amount in Row (11)<br>**7.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Note to Rows 7, 9 and 11: The above-referenced shares of Common Stock beneficially owned by Youxin Consulting Limited ("Youxin Consulting") consist of (i) 343,774 shares of Common Stock issuable upon conversion of 245,553 shares of Series A Convertible Preferred Stock, which are convertible into shares of Common Stock per the Ratio and (ii) 305,480 shares of Common Stock issuable upon the exercise of warrants to purchase Common Stock. The shares of Series A Convertible Preferred Stock vote on an as-converted basis. 

Note to Row 13: The percentages reported in this Amendment No. 6 are based on 8,977,852 shares of Common Stock deemed outstanding pursuant to Rule 13d-3(d)(1), calculated as the sum of 8,328,598 shares of Common Stock outstanding as of April 27, 2026 according to records of the Issuer, plus (i) 343,774 shares of Common Stock that are issuable upon conversion of the Series A Convertible Preferred Stock beneficially owned by Youxin Consulting and (ii) 305,480 shares of Common Stock that are issuable upon the exercise of warrants to purchase Common Stock beneficially owned by Youxin Consulting.

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Li Wai Chung** | Name of reporting person<br>**Li Wai Chung** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**HONG KONG** | Citizenship or place of organization<br>**HONG KONG** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**649254.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**649254.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**649254.00** | Aggregate amount beneficially owned by each reporting person<br>**649254.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**7.2%** | Percent of class represented by amount in Row (11)<br>**7.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Note to Rows 7, 9 and 11: The above-referenced shares of Common Stock beneficially owned by Li Wai Chung consist of (i) 343,774 shares of Common Stock issuable upon conversion of 245,553 shares of Series A Convertible Preferred Stock, which are convertible into shares of Common Stock per the Ratio and (ii) 305,480 shares of Common Stock issuable upon the exercise of warrants to purchase Common Stock. The shares of Series A Convertible Preferred Stock vote on an as-converted basis.

Note to Row 13: The percentages reported in this Amendment No. 6 are based on 8,977,852 shares of Common Stock deemed outstanding pursuant to Rule 13d-3(d)(1), calculated as the sum of 8,328,598 shares of Common Stock outstanding as of April 27, 2026 according to records of the Issuer, plus (i) 343,774 shares of Common Stock that are issuable upon conversion of the Series A Convertible Preferred Stock beneficially owned by Li Wai Chung and (ii) 305,480 shares of Common Stock that are issuable upon the exercise of warrants to purchase Common Stock beneficially owned by Li Wai Chung.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, $0.01 par value

**(b) Name of Issuer:**
FiEE, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
3-33, 2-chome Utajima, Nishiyodogawa District, Osaka, M0, 00000

This Amendment No. 6 amends and supplements the Schedule 13D filed by Cao Yu, Hu Bin, Youxin Consulting and Li Wai Chung (collectively, the "Reporting Persons") on February 25, 2025 (as amended by Amendment No. 1, filed on April 14, 2025, Amendment No. 2, filed on May 13, 2025, Amendment No. 3, filed on May 29, 2025, Amendment No. 4, filed on August 25, 2025, and Amendment No. 5, filed on January 8, 2026, the "Schedule 13D"). This Amendment No. 6 is being filed solely due to an increase in the Issuer's total number of outstanding shares of Common Stock and not as a result of any transactions by the Reporting Persons. Except as specifically provided herein, this Amendment No. 6 does not modify any of the information previously reported in the Schedule 13D. Capitalized terms used but not defined in this Amendment No. 6 shall have the same meanings ascribed to them in the Schedule 13D.

**Item 5. Interest in Securities of the Issuer**

**(a)**
See rows (11) and (13) of the cover pages to this Amendment No. 6 for the aggregate number of shares of Common Stock and percentages of the shares of Common Stock beneficially owned by the Reporting Persons.

**(b)**
See rows (7) through (10) of the cover pages to this Amendment No. 6 for the number of shares of Common Stock as to which the Reporting Persons have the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition.

**(c)**
The Reporting Persons have not effected any transactions in the Issuer's securities within the past 60 days preceding the date of this Amendment No. 6.

### 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.

**Reporting Person:** Cao Yu

**Signature:** /s/ Cao Yu

**Name/Title:** Cao Yu

**Date:** 05/04/2026

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.

**Reporting Person:** Hu Bin

**Signature:** /s/ Hu Bin

**Name/Title:** Hu Bin

**Date:** 05/04/2026

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.

**Reporting Person:** Youxin Consulting Ltd.

**Signature:** /s/ Li Wai Chung

**Name/Title:** Li Wai Chung

**Date:** 01/08/2026

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.

**Reporting Person:** Li Wai Chung

**Signature:** /s/ Li Wai Chung

**Name/Title:** Li Wai Chung

**Date:** 05/04/2026