SEC Form 4
MAIA Biotechnology, Inc. (MAIA) insider trading
In the 12 months to Oct 26, 2026, 7 MAIA insiders reported open-market purchases of $995.8K across 20 filings; 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
- $995.8K
- 20 filings
Who traded MAIA, and when
- Purchase
MAIA daily close from Oct 27, 2025 to Oct 26, 2026, between $0.87 and $2.95, last $1.13. 0 sale and 20 purchase filings by 7 insiders, marked at their filing dates. Vlad Vitoc, Chief Executive Officer: bought $302.4K across 5 filings, first filed Nov 25, 2025, last Sep 15, 2026. Ramiro Guerrero, Director: bought $252.3K across 4 filings, first filed Aug 24, 2026, last Sep 14, 2026. Stan Smith, Director: bought $236.8K across 6 filings, first filed Nov 26, 2025, last Jun 2, 2026. Ngar Yee Louie, Director: bought $100.0K across 1 filing, first filed Dec 23, 2025, last Dec 23, 2025. Cristian Luput, Director: bought $51.6K across 2 filings, first filed Nov 28, 2025, last Dec 1, 2025. Steven M. Chaouki, Director: bought $50.0K across 1 filing, first filed Dec 23, 2025, last Dec 23, 2025. Sergei Gryaznov, Chief Scientific Officer: bought $2.7K across 1 filing, first filed Jun 2, 2026, last Jun 2, 2026.
Largest mark · tap a row for others
Ramiro Guerrero · Director
Purchase $184,103
133,790 shares at $1.38 avg
Filed Sep 1, 2026 · traded Aug 26
Close on filing date $1.30
Vlad Vitoc · Chief Executive Officer
Chief Executive Officer
$302.4K boughtRamiro Guerrero · Director
Director
$252.3K boughtStan Smith · Director
Director
$236.8K boughtNgar Yee Louie · Director
Director
$100.0K boughtCristian Luput · Director
Director
$51.6K boughtSteven M. Chaouki · Director
Director
$50.0K boughtSergei Gryaznov · Chief Scientific Officer
Chief Scientific Officer
$2.7K boughtOpen-market trades
20 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Vlad Vitoc | Chief Executive Officer | — | $302.4K | 5 | — | |
| Ramiro Guerrero | Director | — | $252.3K | 4 | — | |
| Stan Smith | Director | — | $236.8K | 6 | — | |
| Ngar Yee Louie | Director | — | $100.0K | 1 | — | |
| Cristian Luput | Director | — | $51.6K | 2 | — | |
| Steven M. Chaouki | Director | — | $50.0K | 1 | — | |
| Sergei Gryaznov | Chief Scientific Officer | — | $2.7K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Vlad Vitoc Chief Executive Officer | Purchase | 73,000 | $1.37 | $100.0K | 1,049,121 | |
traded | Ramiro Guerrero Director | Purchase | 37,595 | $1.32 | $49.5K | 773,296 | |
traded | Ramiro Guerrero Director | Purchase | 133,790 | $1.38 | $184.1K | 735,701 | |
traded | Ramiro Guerrero Director | Purchase | 1,794 | $1.33 | $2.4K | 601,911 | |
traded | Ramiro Guerrero Director | Purchase | 11,899 | $1.37 | $16.3K | 600,117 | |
traded | Sergei Gryaznov Chief Scientific Officer | Purchase | 2,000 | $1.35 | $2.7K | 46,511 | |
traded | Stan Smith Director | Purchase | 75,000 | $1.34 | $100.2K | 1,519,178 | |
traded | Vlad Vitoc Chief Executive Officer | Purchase | 72,700 | $1.39 | $100.9K | 976,121 | |
traded | Stan Smith Director | Purchase | 2,700 | $3.69 | $10.0K | 1,424,178 | |
traded | Ngar Yee Louie Director | Purchase | 81,699 | $1.22 | $100.0K | 1,248,888 | |
traded | Steven M. Chaouki Director | Purchase | 40,849 | $1.22 | $50.0K | 151,873 | |
traded | Stan Smith Director | Purchase | 57,189 | $1.22 | $70.0K | 1,421,478 | |
traded | Stan Smith Director | Purchase | 13,740 | $1.20 | $16.4K | 4,580 | |
traded | Vlad Vitoc Chief Executive Officer | Purchase | 72,000 | $1.11 | $79.8K | 903,421 | |
traded | Vlad Vitoc Chief Executive Officer | Purchase | 10,500 | $0.97 | $10.1K | 831,421 | |
traded | Stan Smith Director | Purchase | 15,000 | $1.04 | $15.6K | 1,364,289 | |
traded | Cristian Luput Director | Purchase | 38,145 | $1.10 | $41.8K | 437,628 | |
traded | Cristian Luput Director | Purchase | 10,000 | $0.98 | $9.8K | 399,483 | |
traded | Stan Smith Director | Purchase | 25,000 | $0.98 | $24.6K | 1,349,289 | |
traded | Vlad Vitoc Chief Executive Officer | Purchase | 11,800 | $0.98 | $11.5K | 820,921 |
GET /stocks/filings/vX/form-4?tickers=MAIA&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"MAIA"
],
"issuer_cik": "0001878313",
"owner_cik": "0001913257",
"accession_number": "0001878313-26-000087",
"form_type": "4",
"filing_date": "2026-09-15",
"period_of_report": "2026-09-14",
"issuer_name": "MAIA Biotechnology, Inc.",
"issuer_trading_symbol": "MAIA",
"owner_name": "Vitoc Vlad",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": true,
"officer_title": "Chief Executive Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-09-14",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 73000,
"transaction_price_per_share": 1.37,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 1049121,
"transaction_value": 100010.00000000001,
"direct_or_indirect": "D"
},
{
"tickers": [
"MAIA"
],
"issuer_cik": "0001878313",
"owner_cik": "0001913253",
"accession_number": "0001878313-26-000084",
"form_type": "4",
"filing_date": "2026-09-14",
"period_of_report": "2026-09-10",
"issuer_name": "MAIA Biotechnology, Inc.",
"issuer_trading_symbol": "MAIA",
"owner_name": "Guerrero Ramiro",
"is_director": true,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-09-10",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 37595,
"transaction_price_per_share": 1.3171,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 773296,
"transaction_value": 49516.3745,
"direct_or_indirect": "D"
}
]
}
// trimmed to 2 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
- Gifts1 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.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.
Frequently asked questions
Has MAIA Biotechnology, Inc.'s CEO sold stock?
No. Vlad Vitoc (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is MAIA’s insider data?
These are MAIA 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 MAIA 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 MAIA 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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