# EDGAR Filing Document

**Accession Number:** 0000924168
**File Stem:** 0001628280-25-059164
**Filing Date:** 2025-12
**Character Count:** 13129
**Document Hash:** 017bf290e624ddb553a4f641848c97f6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-25-059164.hdr.sgml**: 20251231

**ACCESSION NUMBER**: 0001628280-25-059164

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20251231

**DATE AS OF CHANGE**: 20251231

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ENERGY FOCUS, INC/DE
- **CENTRAL INDEX KEY:** 0000924168
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC LIGHTING & WIRING EQUIPMENT [3640]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 943021850
- **STATE OF INCORPORATION:** OH
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-48205
- **FILM NUMBER:** 251615837

**BUSINESS ADDRESS:**
- **STREET 1:** 32000 AURORA ROAD
- **STREET 2:** SUITE B
- **CITY:** SOLON
- **STATE:** OH
- **ZIP:** 44139
- **BUSINESS PHONE:** 4407151300

**MAIL ADDRESS:**
- **STREET 1:** 32000 AURORA ROAD
- **STREET 2:** SUITE B
- **CITY:** SOLON
- **STATE:** OH
- **ZIP:** 44139

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FIBERSTARS INC /CA/
- **DATE OF NAME CHANGE:** 19940527
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Huang Chiao Chieh
- **CENTRAL INDEX KEY:** 0001964786

**ORGANIZATION NAME:**

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

**MAIL ADDRESS:**
- **STREET 1:** 32000 AURORA RD.
- **STREET 2:** SUITE B
- **CITY:** SOLON
- **STATE:** OH
- **ZIP:** 44139

## Exhibit 99.1

Exhibit 99.1

**JOINT FILING AGREEMENT**

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with all other Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to Common Stock, par value $0.0001 per share of Energy Focus, Inc., a Delaware corporation, and that this Agreement may be included as an Exhibit to such joint filing. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of December 31, 2025.

---

| | |
|:---|:---|
| Chiao Chieh (Jay) Huang | Chiao Chieh (Jay) Huang |
| By: | /s/ Chiao Chieh (Jay) Huang |
| SANDER ELECTRONIC CO., LTD. | SANDER ELECTRONIC CO., LTD. |
| By: | /s/ Chiao Chieh (Jay) Huang |
| Name: | Chiao Chieh (Jay) Huang |
| Title: | Chief Executive Officer |

---

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**Energy Focus, Inc.**

*(Name of Issuer)*

**Common Stock, $0.0001 par value per share**

*(Title of Class of Securities)*

**29268T508**

*(CUSIP Number)*

**Huang, Chiao Chieh**<br>32000 Aurora Road Suite B<br>Solon OH 44139<br>4407151300

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

**01/17/2023**

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

| **CUSIP No.** | **29268T508** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Huang Chiao Chieh** | Name of reporting person<br>**Huang Chiao Chieh** | |
| 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>**F5** | Citizenship or place of organization<br>**F5** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**1998599.00** |
| 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>**1998599.00** |
| 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>**1998599.00** | Aggregate amount beneficially owned by each reporting person<br>**1998599.00** | |
| 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>**31.9%** | Percent of class represented by amount in Row (11)<br>**31.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** Mr. Chiao Chieh Huang ("Mr. Huang") personally holds 1,421,219 shares of Comon Stock (as defined below) of the Company (as defined below). He is also the sole beneficial owner of 577,380 shares of Company's Common Stock held by Sander Electronic Co., Ltd.

| **CUSIP No.** | **29268T508** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SANDER ELECTRONIC CO., LTD.** | Name of reporting person<br>**SANDER ELECTRONIC CO., 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>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 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>**F5** | Citizenship or place of organization<br>**F5** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**577380.00** |
| 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>**577380.00** |
| 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>**577380.00** | Aggregate amount beneficially owned by each reporting person<br>**577380.00** | |
| 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>**9.2%** | Percent of class represented by amount in Row (11)<br>**9.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** Mr. Huang is the sole director and executive officer of Sander Electronic Co., Ltd., therefore, Mr. Huang is the sole beneficiary and has the sole voting power of 577,380 shares of Company's Common Stock.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, $0.0001 par value per share

**(b) Name of Issuer:**
Energy Focus, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
32000 Aurora Road Suite B, Solon, OH, 44139

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Section Section  240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.
The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

**Item 4. Purpose of Transaction**

The response to Item 3 of this Schedule 13D is incorporated herein by reference.

Mr. Huang is the Chief Executive Officer and a member of the Board of Directors of the Issuer. Except as disclosed in this Schedule 13D, the Reporting Person currently has no plans or proposals that relate to or would result in any transaction, event or action enumerated in paragraphs (a) through (j) of Item 4 of Schedule 13D.

The Reporting Persons intend to review from time to time his investment in the Issuer and, depending on such review, may consider from time to time various alternative courses of action. In addition, depending on prevailing conditions from time to time, including, without limitation, price and availability of shares, future evaluations by the Reporting Persons of the business and prospects of the Issuer, regulatory requirements, other investment opportunities available to the Reporting Persons and general stock market and economic conditions, the Reporting Persons may determine to increase his investment or sell all or part of his investment in the Issuer through open-market purchases, privately negotiated transactions, a tender or exchange offer or otherwise.

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

**(a)**
See items (11) and (13) of the cover pages to this Schedule 13D for the aggregate number of Common Stock and percentages of the Common Stock beneficially owned by the Reporting Persons.

The percentage used in this Schedule 13D is calculated based upon an aggregate of 6,268,433 shares of Common Stock issued and outstanding as of the date hereof.

**(b)**
See items 7 through 10 of the cover pages to this Schedule 13D for the number of shares of Common Stock beneficially owned by each of the Reporting Persons as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote and sole or shared power to dispose or to direct the disposition.

**(c)**
On August 15, 2025, Energy Focus, Inc. (the "Company") entered into a securities purchase agreement (the "Purchase Agreement") with its Chief Executive Officer and Chief Financial Officer, Mr. Chiao Chieh (Jay) Huang (the "Purchaser"), pursuant to which the Company agreed to issue and sell in a private placement (the "Private Placement") an aggregate of 264,550 shares (the "Shares") of the Company's common stock, par value $0.0001 per share (the "Common Stock"), for a purchase price per share of $1.89, the closing price of the Common Stock on the day immediately preceding the date of the Purchase Agreement, totaling $500,000.

On November 26, 2025, Energy Focus, Inc. (the "Company") entered into a securities purchase agreement (the "Purchase Agreement") with each of its Chief Executive Officer and Chief Financial Officer, Mr. Chiao Chieh (Jay) Huang and MAN-BO HOTEL CO. LTD, an affiliate entity, (each, a "Purchasers", collectively, the "Purchasers"), respectively, pursuant to which the Company agreed to issue and sell in a private placement (the "Private Placement") 262,009 shares of the Company's common stock, par value $0.0001 per share (the "Common Stock") to each, and in aggregate, 524,018 shares of Common Stock (the "Shares") for a purchase price per share of $2.29, the closing price of the Common Stock on the day immediately preceding the date of the Purchase Agreement, totaling $1,200,000.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

There are no contracts, arrangements, understandings or relationships (legal or otherwise) between the Reporting Persons and any person with respect to any securities of the Issuer, including but not limited to transfer or voting of any other securities, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, divisions of profits or loss, or the giving or withholding of proxies, including any securities pledged or otherwise subject to a contingency the occurrence of which would give another person voting power or investment power over such securities.

### 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:** Huang Chiao Chieh

**Signature:** Huang Chiao Chieh

**Name/Title:** Huang Chiao Chieh

**Date:** 12/31/2025

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:** SANDER ELECTRONIC CO., LTD.

**Signature:** Huang Chiao Chieh

**Name/Title:** Huang Chiao Chieh / Chief Executive Officer

**Date:** 12/31/2025