iBio Ownership | Who Owns iBio?

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iBio Ownership Summary

iBio is owned by 2.11% institutional investors, 1.71% insiders, and 96.18% retail investors. Opaleye management is the largest institutional shareholder, holding 3.57% of IBIO shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 1.86% of its assets in iBio shares.

IBIO Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	iBio	2.11%	1.71%	96.18%
Sector	Healthcare Stocks	35.74%	11.83%	52.43%
Industry	Biotech Stocks	36.05%	11.82%	52.13%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Opaleye management	375.00K	3.57%	$310.43K
Affinity asset advisors	3.11M	3.13%	$5.90M
Frazier life sciences management	1.95M	1.97%	$3.71M
Vanguard group	883.15K	1.67%	$1.70M
Ecor1 capital	1.58M	1.60%	$3.01M
Millennium management	1.55M	1.56%	$2.94M
Logos global management lp	1.30M	1.31%	$2.47M
Balyasny asset management	1.01M	1.02%	$1.92M
Ikarian capital	957.06K	0.97%	$1.82M
Citadel advisors	956.43K	0.96%	$1.82M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Affinity asset advisors	3.11M	0.30%	$5.90M
Sio capital management	904.27K	0.25%	$1.72M
Ikarian capital	957.06K	0.15%	$1.82M
Ecor1 capital	1.58M	0.13%	$3.01M
Logos global management lp	1.30M	0.12%	$2.47M
Verdad advisers, lp	56.32K	0.12%	$107.00K
Frazier life sciences management	1.95M	0.10%	$3.71M
Noesis capital mangement	311.50K	0.09%	$591.85K
Dafna capital management	193.64K	0.08%	$367.91K
Opaleye management	375.00K	0.04%	$310.43K

Top Buyers

Holder	Shares	% Assets	Change
Millennium management	1.55M	0.00%	1.55M
Affinity asset advisors	3.11M	0.30%	1.05M
Citadel advisors	956.43K	0.00%	956.43K
Vanguard group	883.15K	-	609.08K
Marshall wace, llp	620.60K	0.00%	499.32K

Top Sellers

Holder	Shares	% Assets	Change
Logos global management lp	1.30M	0.12%	-700.00K
Ecor1 capital	1.58M	0.13%	-645.00K
Ameriprise financial	-	-	-584.37K
Renaissance	-	-	-353.34K
Monashee investment management	-	-	-274.86K

New Positions

Holder	Shares	% Assets	Change	Value
Millennium management	1.55M	0.00%	1.55M	$2.94M
Vanguard fiduciary trust	205.01K	0.00%	205.01K	$389.53K
Goldman sachs group	200.21K	-	200.21K	$380.40K
Dafna capital management	193.64K	0.08%	193.64K	$367.91K
Verdad advisers, lp	56.32K	0.12%	56.32K	$107.00K

Sold Out

Holder	Change
Fmr	-1.00
Barclays	-2.00
City	-4.00
Atlantic union bankshares	-14.00
Harbour investments	-40.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	18	-63.27%	2,091,212	-87.20%	2	0.78%	9	-75.68%	3	-
Dec 31, 2025	32	-	7,274,652	103.77%	13	1.19%	22	57.14%	1	-83.33%
Sep 30, 2025	32	6.67%	3,569,988	11.42%	34	3.22%	14	-	6	200.00%
Jun 30, 2025	30	-9.09%	3,203,758	23.84%	32	4.72%	13	-23.53%	2	-
Mar 31, 2025	33	13.79%	2,587,118	-0.97%	26	3.21%	17	142.86%	2	-66.67%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	671.50K	1.86%	-
Vanguard Institutional Extnd Mkt Idx Tr	396.14K	1.10%	-
Fidelity Extended Market Index	190.98K	0.53%	66.51K
Blackrock Extended Mkt Fund CF	124.75K	0.35%	-
BlackRock Extended Equity Market Fund K	106.22K	0.29%	75.12K
Alger Life Sciences Innovation Composite	51.51K	0.14%	51.51K
Fidelity Series Total Market Index	51.34K	0.14%	19.72K
Fidelity Total Market Index	50.01K	0.14%	5.00K
Spartan Extended Market Index Pool F	48.59K	0.13%	25.03K
Northern Trust Extended Eq Market Idx	41.68K	0.12%	29.34K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 26, 2026	Banjak Marc	Chief Legal Officer	Buy	$2.52K
Mar 26, 2026	Banjak Marc	Chief Legal Officer	Buy	$20.53K
Mar 19, 2026	Duran Felipe	Chief Financial Officer	Buy	$50.13K
Mar 19, 2026	Brenner Martin	See Remarks	Buy	$24.92K
Jan 10, 2025	Duran Felipe	Chief Financial Officer	Buy	$25.00K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	-
2026 Q1	4	-
2025 Q4	-	-
2025 Q1	7	-
2024 Q4	-	-

IBIO Ownership FAQ

Who Owns iBio?

iBio shareholders are primarily institutional investors at 2.11%, followed by 1.71% insiders and 96.18% retail investors. The average institutional ownership in iBio's industry, Biotech Stocks , is 36.05%, which iBio falls below.

Who owns the most shares of iBio?

iBio’s largest shareholders are Opaleye management (375K shares, 3.57%), Affinity asset advisors (3.11M shares, 3.13%), and Frazier life sciences management (1.95M shares, 1.97%). Together, they hold 8.68% of iBio’s total shares outstanding.

Does Blackrock own iBio?

BlackRock is not among the top 10 institutional shareholders of iBio.

Who is iBio’s biggest shareholder by percentage of total assets invested?

Affinity asset advisors is iBio’s biggest shareholder by percentage of total assets invested, with 0.30% of its assets in 3.11M iBio shares, valued at 5.9M$.

Who is the top mutual fund holder of iBio shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of iBio shares, with 1.86% of its total shares outstanding invested in 671.5K iBio shares.

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