Alessandro Zamboni - 01 Oct 2025 Form 4 Insider Report for Nuburu, Inc. (BURU)

Reporting relationship: Co-Chief Executive Officer, Director
Issuer ticker: BURU
Reported as of: 01 Oct 2025
Net transaction value: +$1,496,021
SEC form: 4
Accepted by SEC: 22 Apr 2026, 16:53:40 UTC
Prior SEC filing: 22 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Alessandro Zamboni

Key filing fact

Alessandro Zamboni filed Form 4 for Nuburu, Inc. (BURU) on 22 Apr 2026.

Key facts

This page summarizes Alessandro Zamboni's Form 4 filing for Nuburu, Inc. (BURU).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 22 Apr 2026, 16:53.

Change

Previous filing in this sequence was filed on 22 Apr 2026.
Current net transaction value: +$1,496,021.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002022188 Primary reporting owner

Zamboni Alessandro

Relationship: Co-Chief Executive Officer, Director
Address: C/O NUBURU, INC., 44 COOK STREET, SUITE 100, DENVER
Signature: /s/ Alessandro Zamboni
Signature date: 22 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

BURU transaction

Common Stock

Award

Transaction value
Shares: +355,511
Change %
Price: $0.000000^*
Shares after: 355,511
Date: 01 Oct 2025
Ownership: Direct
Footnotes: F1

BURU transaction

Common Stock

Purchase

Transaction value: $1,496,021
Shares: +4,332,525
Change %
Price: $0.3453
Shares after: 4,332,525
Date: 31 Dec 2025
Ownership: By Vanguard Holdings S.r.l.
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

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.

Footnote F2

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.