MAIA Biotechnology MAIA Insider Ownership

NYSE MAIA

$1.15 +0.03 (+2.68%)

As of: Oct 21, 2026 · 1:03 PM EDT

Insider Holdings by Owner

5.64Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

8.62%

▲+0.424% pp QoQ

Shares Held by Insiders

5.24Mn

filed for Sep 2026

▲+5.18% QoQ

Shares Outstanding

60.82Mn

60,817,482 shares

Direct Holdings

3.71Mn

Indirect: 1.53Mn

Net Shares Traded (QoQ)

+258.08K

net buying in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Across the past 12 months, open-market trades by MAIA Biotechnology insiders were all purchases, totaling $985,885 (783.7K shares).

Counted by insider, open-market buying of MAIA stock in the past 12 months came from 7 insiders, with no insider selling.
Among MAIA Biotechnology's insiders, Vlad Vitoc (Chief Executive Officer) was the largest open-market buyer over the past 12 months, purchasing $302,435 of stock (240K shares), most recently on September 14, 2026.
Per Business Quant, MAIA insiders together hold 5.24Mn shares based on their latest Form 4 filings, up 5.18% from 4.98Mn shares at the end of Q2 2026 and up 18.70% from 4.41Mn shares at the end of Q3 2025.
Indirect holdings, through trusts, partnerships, family members and other entities, make up 29.25% (1.53Mn shares) of MAIA Biotechnology's insider total, with the other 70.75% (3.71Mn shares) held directly.
The insider holdings in MAIA Biotechnology belong to 7 insiders who have reported on Form 4 within the past two years.
MAIA Biotechnology's top three insider holders by shares held are Stan Smith (Director, 1.53Mn shares), Ngar Yee Louie (Director, 1.25Mn shares) and Vlad Vitoc (Chief Executive Officer, 1.05Mn shares).
The largest insider, Stan Smith, holds 29.25% of MAIA's insider total.
Institutions accounted for 22.24% of MAIA's outstanding shares in Q2 2026, insiders about 8.62% per their latest Form 4 filings, and other investors, including the public, about 69.14%.
Over the trailing 12 months, 9 insiders reported transactions in MAIA stock across 51 Form 4 filings.
The insider data for MAIA reflects Form 4 filings through October 2, 2026.

Form 4 Holdings

Insiders Holding MAIA

Insiders 10

Shares held 5.64Mn

Of outstanding 9.27%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Stan Smith	Director	0	1,519,178	1,519,178	26.9%	02 Jun, 2026
2	Ngar Yee Louie	Director	1,248,888	0	1,248,888	22.1%	22 Dec, 2025
3	Vlad Vitoc	Chief Executive Officer	1,049,121	0	1,049,121	18.6%	15 Sep, 2026
4	Ramiro Guerrero	Director	773,296	0	773,296	13.7%	14 Sep, 2026
5	Cristian Luput	Director	437,628	0	437,628	7.8%	28 Nov, 2025
6	Laurentiu Vlad	Director	376,933	0	376,933	6.7%	02 Aug, 2022
7	Steven M Chaouki	Director	151,873	0	151,873	2.7%	22 Dec, 2025
8	Sergei Gryaznov	Chief Scientific Officer	46,511	0	46,511	0.8%	02 Jun, 2026
9	Mihail Obrocea	Chief Medical Officer	27,100	0	27,100	0.5%	02 Aug, 2022
10	Joseph F Mcguire	Chief Financial Officer	9,400	0	9,400	0.2%	28 Apr, 2023

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

315 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
30 Sep, 2026	Stan Smith	Director	Acquired A	38,871	$0.00	$0	38,871	Indirect
30 Sep, 2026	Jean-Manasse Theagene	Director	Acquired A	32,012	$0.00	$0	32,012	Direct
30 Sep, 2026	Ramiro Guerrero	Director	Acquired A	32,012	$0.00	$0	32,012	Direct
30 Sep, 2026	Cristian Luput	Director	Acquired A	33,536	$0.00	$0	33,536	Direct
30 Sep, 2026	Steven M Chaouki	Director	Acquired A	32,774	$0.00	$0	32,774	Direct
30 Sep, 2026	Ngar Yee Louie	Director	Acquired A	39,634	$0.00	$0	39,634	Direct
14 Sep, 2026	Vlad Vitoc	Chief Executive Officer	Acquired P	73,000	$1.37	$100.01K	1,049,121	Direct
10 Sep, 2026	Ramiro Guerrero	Director	Acquired P	37,595	$1.32	$49.52K	773,296	Direct
26 Aug, 2026	Ramiro Guerrero	Director	Acquired P	8,931	$1.39	$12.41K	610,842	Direct
27 Aug, 2026	Ramiro Guerrero	Director	Acquired P	78,239	$1.39	$108.75K	689,081	Direct
28 Aug, 2026	Ramiro Guerrero	Director	Acquired P	46,620	$1.35	$62.94K	735,701	Direct
24 Aug, 2026	Ramiro Guerrero	Director	Acquired P	1,794	$1.33	$2.39K	601,911	Direct
20 Aug, 2026	Ramiro Guerrero	Director	Acquired P	11,899	$1.37	$16.30K	600,117	Direct
30 Jun, 2026	Ramiro Guerrero	Director	Acquired A	26,355	$0.00	$0	26,355	Direct
30 Jun, 2026	Ngar Yee Louie	Director	Acquired A	32,630	$0.00	$0	32,630	Direct
30 Jun, 2026	Jean-Manasse Theagene	Director	Acquired A	26,355	$0.00	$0	26,355	Direct
30 Jun, 2026	Cristian Luput	Director	Acquired A	27,610	$0.00	$0	27,610	Direct
30 Jun, 2026	Stan Smith	Director	Acquired A	32,003	$0.00	$0	32,003	Indirect
30 Jun, 2026	Steven M Chaouki	Director	Acquired A	26,982	$0.00	$0	26,982	Direct
01 Jun, 2026	Vlad Vitoc	Chief Executive Officer	Acquired P	72,700	$1.39	$100.89K	976,121	Direct

Showing 1 to 20 of 315 transactions