SEC Form 4
Nuburu, Inc. (BURU) insider trading
In the 12 months to Oct 26, 2026, one BURU insider reported open-market purchases of $1.5M across 1 filing; no open-market sales were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $0
- 0 filings · 0 insiders
- Open-market purchases
- $1.5M
- 1 filing · Alessandro Zamboni, Co-Chief Executive Officer
Who traded BURU, and when
- Purchase
BURU daily close from Oct 27, 2025 to Oct 26, 2026, between $0.22 and $78.84, last $0.22. 0 sale and 1 purchase filings by 1 insider, marked at their filing dates. Alessandro Zamboni, Co-Chief Executive Officer: bought $1.5M across 1 filing, first filed Apr 22, 2026, last Apr 22, 2026.
Largest mark · tap a row for others
Alessandro Zamboni · Co-Chief Executive Officer
Purchase $1,496,021
4,332,525 shares at $0.35 avg
Filed Apr 22, 2026 · traded Dec 31
Close on filing date $11.24
Alessandro Zamboni · Co-Chief Executive Officer
Co-Chief Executive Officer
$1.5M boughtOpen-market trades
1 filing in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Alessandro Zamboni | Co-Chief Executive Officer | — | $1.5M | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Alessandro Zamboni Co-Chief Executive Officer | Purchase | 4,332,525 | $0.35 | $1.5M | 4,332,525 |
GET /stocks/filings/vX/form-4?tickers=BURU&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"BURU"
],
"issuer_cik": "0001814215",
"owner_cik": "0002022188",
"accession_number": "0001193125-26-170692",
"form_type": "4",
"filing_date": "2026-04-22",
"period_of_report": "2025-10-01",
"issuer_name": "Nuburu, Inc.",
"issuer_trading_symbol": "BURU",
"owner_name": "Zamboni Alessandro",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Co-Chief Executive Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2025-12-31",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 4332525,
"transaction_price_per_share": 0.3453,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 4332525,
"transaction_value": 1496020.8825,
"direct_or_indirect": "I",
"nature_of_ownership": "By Vanguard Holdings S.r.l.",
"footnotes": [
{
"id": "F2",
"description": "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."
}
]
}
]
}
// trimmed to 1 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 1 record
- Grants and awards1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has Nuburu, Inc.'s CEO sold stock?
No. Alessandro Zamboni (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is BURU’s insider data?
These are BURU Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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Track BURU insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for BURU every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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