Insider Ledger
MAIA insider buying and SEC filings, explained
MAIA Biotechnology, Inc. · CIK 1878313
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Company profile
- Exchanges
- NYSE
- Industry (SIC)
- Pharmaceutical Preparations
- State of incorporation
- DE
- Fiscal year end
- Dec 31
Insider activity in the last 12 months
Bought
$971K
Insiders who bought
6
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 14, 2026 | Purchase (code P) | Vlad Vitoc (CEO and Director) bought 73,000 shares at $1.37 ($100K), reported as a purchase (code P). Holdings up 7% to 1,049,121 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 15, 2026 |
| Sep 10, 2026 | Purchase (code P) | Ramiro Guerrero (Director) bought 37,595 shares at $1.32 ($50K), reported as a purchase (code P). Holdings up 5% to 773,296 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 14, 2026 |
| Aug 26–28, 2026 | Purchase (code P) | Ramiro Guerrero (Director) bought 133,790 shares between Aug 26 and Aug 28 at about $1.38 ($184K), reported as a purchase (code P). Holdings up 22% to 735,701 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 1, 2026 |
| Aug 24, 2026 | Purchase (code P) | Ramiro Guerrero (Director) bought 1,794 shares at $1.33 ($2K), reported as a purchase (code P). Holdings up <1% to 601,911 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 26, 2026 |
| Aug 20, 2026 | Purchase (code P) | Ramiro Guerrero (Director) bought 11,899 shares at $1.37 ($16K), reported as a purchase (code P). Holdings up 2% to 600,117 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 24, 2026 |
| Jun 1, 2026 | Purchase (code P) | Vlad Vitoc (CEO and Director) bought 72,700 shares at about $1.39 ($101K), reported as a purchase (code P). Holdings up 8% to 976,121 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 2, 2026 |
| Jun 1, 2026 | Purchase (code P) | Stan Smith (Director) bought 75,000 shares indirectly at about $1.34 ($101K), reported as a purchase (code P). Indirect holdings up 5% to 1,519,178 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 2, 2026 |
| Jun 1, 2026 | Purchase (code P) | Sergei Gryaznov (Chief Scientific Officer) bought 2,000 shares at $1.35 ($3K), reported as a purchase (code P). Holdings up 4% to 46,511 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 2, 2026 |
| Sep 19, 2022 | Purchase (code P) | Stan Smith (Director) bought 2,700 shares indirectly at $3.69 ($10K), reported as a purchase (code P). Indirect holdings up <1% to 1,424,178 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jan 12, 2026 |
| Dec 22, 2025 | Other purchase | Stan Smith (Director) bought 57,189 Stock Options indirectly at $1.36 ($78K), reported as a purchase (code P). New position of 57,189 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 23, 2025 |
| Dec 22, 2025 | Purchase (code P) | Stan Smith (Director) bought 57,189 shares indirectly at $1.22 ($70K), reported as a purchase (code P). Indirect holdings up 4% to 1,421,478 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 23, 2025 |
| Dec 22, 2025 | Other purchase | Steven M. Chaouki (Director) bought 40,849 Stock Options at $1.36 ($56K), reported as a purchase (code P). New position of 40,849 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 23, 2025 |
| Dec 22, 2025 | Purchase (code P) | Steven M. Chaouki (Director) bought 40,849 shares at $1.22 ($50K), reported as a purchase (code P). Holdings up 37% to 151,873 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 23, 2025 |
| Dec 22, 2025 | Other purchase | Ngar Yee Louie (Director) bought 81,699 Stock Options at $1.36 ($111K), reported as a purchase (code P). New position of 81,699 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 23, 2025 |
| Dec 22, 2025 | Purchase (code P) | Ngar Yee Louie (Director) bought 81,699 shares at $1.22 ($100K), reported as a purchase (code P). Holdings up 7% to 1,248,888 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 23, 2025 |
| Dec 5, 2025 | Purchase (code P) | Stan Smith (Director) bought 13,740 shares indirectly at about $1.20 ($16K), reported as a purchase (code P). New position of 4,580 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 9, 2025 |
| Nov 26–28, 2025 | Purchase (code P) Amended filing | Vlad Vitoc (CEO and Director) bought 72,000 shares between Nov 26, 2025 and Nov 28, 2025 at about $1.11 ($80K), reported as a purchase (code P). Holdings up 9% to 903,421 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Dec 1, 2025. | SEC filing Filed Dec 4, 2025 |
| Nov 25, 2025 | Purchase (code P) Amended filing | Vlad Vitoc (CEO and Director) bought 10,500 shares at $0.9700 ($10K), reported as a purchase (code P). Holdings up 1% to 831,421 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Nov 28, 2025. | SEC filing Filed Dec 4, 2025 |
| Nov 26–28, 2025 | Purchase (code P) | Cristian Luput (Director) bought 38,145 shares between Nov 26, 2025 and Nov 28, 2025 at about $1.09 ($42K), reported as a purchase (code P). Holdings up 10% to 437,628 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 1, 2025 |
| Nov 26, 2025 | Purchase (code P) | Stan Smith (Director) bought 15,000 shares indirectly at about $1.04 ($16K), reported as a purchase (code P). Indirect holdings up 1% to 1,364,289 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 1, 2025 |
| Nov 25, 2025 | Purchase (code P) | Cristian Luput (Director) bought 10,000 shares at $0.9800 ($10K), reported as a purchase (code P). Holdings up 3% to 399,483 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 28, 2025 |
| Nov 24–25, 2025 | Purchase (code P) | Stan Smith (Director) bought 25,000 shares indirectly between Nov 24, 2025 and Nov 25, 2025 at about $0.9840 ($25K), reported as a purchase (code P). Indirect holdings up 2% to 1,349,289 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 26, 2025 |
| Nov 21–24, 2025 | Purchase (code P) | Vlad Vitoc (CEO and Director) bought 11,800 shares between Nov 21, 2025 and Nov 24, 2025 at about $0.9793 ($12K), reported as a purchase (code P). Holdings up 1% to 820,921 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 25, 2025 |
31 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
2 insiders bought in 30 days
$350K in purchases since Aug 20, 2026 · Purchases traded Aug 20, 2026 to Sep 14, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Ramiro Guerrero (Director) | $16K | Aug 20, 2026 | SEC filing |
| Ramiro Guerrero (Director) | $184K | Aug 28, 2026 | SEC filing |
| Ramiro Guerrero (Director) | $50K | Sep 10, 2026 | SEC filing |
| Vlad Vitoc (CEO) | $100K | Sep 14, 2026 | SEC filing |
2 insiders bought in 30 days
$202K in purchases since Jun 1, 2026 · Purchases traded Jun 1, 2026 to Jun 1, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Stan Smith (Director) | $101K | Jun 1, 2026 | SEC filing |
| Vlad Vitoc (CEO) | $101K | Jun 1, 2026 | SEC filing |
5 insiders bought in 30 days
$420K in purchases since Nov 24, 2025 · Purchases traded Nov 24, 2025 to Dec 22, 2025 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Vlad Vitoc (CEO) | $12K | Nov 24, 2025 | SEC filing |
| Stan Smith (Director) | $25K | Nov 25, 2025 | SEC filing |
| Vlad Vitoc (CEO) | $10K | Nov 25, 2025 | SEC filing |
| Stan Smith (Director) | $16K | Nov 26, 2025 | SEC filing |
| Cristian Luput (Director) | $42K | Nov 28, 2025 | SEC filing |
| Vlad Vitoc (CEO) | $80K | Nov 28, 2025 | SEC filing |
| Stan Smith (Director) | $16K | Dec 5, 2025 | SEC filing |
| Ngar Yee Louie (Director) | $100K | Dec 22, 2025 | SEC filing |
| Steven M. Chaouki (Director) | $50K | Dec 22, 2025 | SEC filing |
| Stan Smith (Director) | $70K | Dec 22, 2025 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
Follow MAIA in the Insider Ledger app
Get the appA plain-English brief of insider purchases, 8-Ks and red flags at the companies you pick. No account needed.