# EDGAR Filing Document

**Accession Number:** 0002022188
**File Stem:** 0001193125-26-170692
**Filing Date:** 2026-4
**Character Count:** 7024
**Document Hash:** b99f6fbbf9c5ee582c295fbbb120d91b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-170692.hdr.sgml**: 20260422

**ACCESSION NUMBER**: 0001193125-26-170692

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251001

**FILED AS OF DATE**: 20260422

**DATE AS OF CHANGE**: 20260422

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Zamboni Alessandro
- **CENTRAL INDEX KEY:** 0002022188

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39489
- **FILM NUMBER:** 26884487

**MAIL ADDRESS:**
- **STREET 1:** VIA GIUSEPPE MAZZINI, 4
- **CITY:** BERGAMO
- **STATE:** L6
- **ZIP:** 24128
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Nuburu, Inc.
- **CENTRAL INDEX KEY:** 0001814215
- **STANDARD INDUSTRIAL CLASSIFICATION:** MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 44 COOK STREET
- **STREET 2:** SUITE 100
- **CITY:** DENVER
- **STATE:** CO
- **ZIP:** 80206
- **BUSINESS PHONE:** (303) 780-7389

**MAIL ADDRESS:**
- **STREET 1:** 44 COOK STREET
- **STREET 2:** SUITE 100
- **CITY:** DENVER
- **STATE:** CO
- **ZIP:** 80206

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Tailwind Acquisition Corp.
- **DATE OF NAME CHANGE:** 20200604

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Zamboni Alessandro<br><sub>(Last) (First) (Middle)</sub><br>C/O NUBURU, INC.<br>44 COOK STREET, SUITE 100<br><sub>(Street)</sub><br>DENVER, CO 80206<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-10-01 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Co-Chief Executive Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Nuburu, Inc. [ BURU ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<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

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-10-01 |  | A |  | 355511<sup>(1)</sup> | A | $0 | 355511 | D |  |
| Common Stock | 2025-12-31 |  | P |  | 4332525<sup>(2)</sup> | A | 0.3453<sup>(2)</sup> | 4332525 | I | By Vanguard Holdings S.r.l. |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) On October 1, 2025, the reporting person was granted 1,774,000 restricted stock units, which vested on October 31, 2025.  Nuburu, Inc. (the "Company") effected a reverse stock split on February 27, 2026, and its common stock began trading on a 1-for-4.99 split-adjusted basis (with every 4.99 shares being converted into a single share) at the commencement of trading on March 2, 2026 (the "2026 Reverse Stock Split").  The number of restricted stock units in the table has been adjusted for the 2026 Reverse Stock Split.

(2) On December 31, 2025, Vanguard Holdings S.r.l., an entity owned by the reporting person, converted (i) a convertible promissory note in the amount of $545,000 issued by Nuburu, Inc. (the "Company"), plus outstanding interest, and (ii) a convertible promissory note in the amount of $900,000 issued by the Company, plus outstanding interest, in exchange for 21,619,298 shares of common stock at a conversion price equal to a 33.33% discount to the lowest daily volume weighted average price as reported by Bloomberg L.P. during the five days prior to the conversion date.  The number of shares acquired and the price per share in the table have been adjusted for the 2026 Reverse Stock Split.

**Signature:** /s/ Alessandro Zamboni  
**Date:** 2026-04-22

### 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.**