Comparable stake leader
Cormorant Asset Management, LP
SEC ownership of iBio, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001420720.
Disclosed value leader
Sirenia Capital Management LP
Comparable rows
50/50
Latest evidence
30 Jun 2026
- Public ticker
- IBIO on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Cormorant Asset Management, LP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Cormorant Asset Management, LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001420720
- Issuer location
- New York, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of iBio, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Cormorant Asset Managemen...
Disclosed value leader
Sirenia Capital Managemen...
Comparable rows
50/50
Latest evidence
30 Jun 2026
13D/G
13F
Lead comparable stake: 10%
13D/G row: Cormorant Asset Management, LP
Showing 1-8 of 50 holder rows.
Quick read
Cormorant Asset Management, LP leads the comparable SEC ownership view at 10%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Cormorant Asset Management, LP's linked filing trail.
Comparable ownership
Top 5
Cormorant Asset Management, LP
10%
Affinity Asset Advisors, LLC
10%
SILVERARC CAPITAL MANAGEMENT, LLC
10%
Adage Capital Management, L.P.
10%
Sirenia Capital Management LP
9.9%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Cormorant Asset Management, LP |
13D/G
13F
Company
|
10%
|
$7,420,347
5,117,481 shares
|
+$4,160,733 | 30 Jun 2026 |
| Affinity Asset Advisors, LLC |
13D/G
13F
Company
|
10%
|
$7,349,879
5,068,882 shares
|
+$2,290,759 | 30 Jun 2026 |
| SILVERARC CAPITAL MANAGEMENT, LLC |
13F
13D/G
Company
|
10%
from 13D/G
|
$6,160,858
3,520,490 shares
|
— | 30 Jun 2026 |
| Adage Capital Management, L.P. |
13D/G
|
10%
|
$1,795,528
2,181,422 shares
|
$0 | 30 Sep 2025 |
| Sirenia Capital Management LP |
13D/G
|
9.9%
|
$25,489,948
11,586,340 shares
|
$0 | 31 Mar 2026 |
| Vestal Point Capital, LP |
13D/G
13F
Company
|
7.9%
|
$5,836,250
4,025,000 shares
|
-$362,500 | 30 Jun 2026 |
| Opaleye Management Inc. |
13D/G
|
7.6%
|
$787,500
750,000 shares
|
$0 | 31 Dec 2024 |
| Frazier Life Sciences Public Fund, L.P. |
13D/G
|
5.7%
|
—
1,953,467 shares
|
$0 | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$98,106.
Buys
$98,106
Insiders: 3
Sells
$0
Insiders: 0
Net
+$98,106
Shares: +51,105
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 51,105
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 51,105 | 0 | $98,106 | $0 | +$98,106 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-18 of 18 reporting-owner rows connected to iBio, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
18
Largest Forms 3/4/5 holder
Antonio Bernardino Guimaraes Parada
Net 12M change
+$98,106
Latest report
31 Jul 2026
Recent insider transactions for iBio, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Molly Carr | IBIO | Stock Option (right to buy) | Award | 430,000 | 430,000 | 31 Jul 2026 | Direct | |||
| Elizabeth Stoner | IBIO | Stock Option (right to buy) | Award | 60,000 | 60,000 | 18 May 2026 | Direct | |||
| Marc Banjak | IBIO | Common Stock | Purchase | 125.9% | $23,055 | $1.65 | 13,934 | 25,000 | 26 Mar 2026 | Direct |
| Felipe Duran | IBIO | Common Stock | Purchase | 223% | $50,132 | $2.02 | 24,835 | 35,974 | 19 Mar 2026 | Direct |
| Martin Brenner | IBIO | Common Stock | Purchase | 67.4% | $24,919 | $2.02 | 12,336 | 30,652 | 19 Mar 2026 | Direct |
| Marc Banjak | IBIO | Stock Option (right to buy) | Award | 146,000 | 146,000 | 28 Jan 2026 | Direct | |||
| Felipe Duran | IBIO | Stock Option (right to buy) | Award | 179,000 | 179,000 | 28 Jan 2026 | Direct | |||
| Martin Brenner | IBIO | Stock Option (right to buy) | Award | 479,000 | 479,000 | 28 Jan 2026 | Direct | |||
| Evert B. Schimmelpennink | IBIO | Stock Option (right to buy) | Award | 13,500 | 13,500 | 20 Nov 2025 | Direct | |||
| William D. Clark | IBIO | Stock Option (right to buy) | Award | 13,500 | 13,500 | 20 Nov 2025 | Direct | |||
| Gary Sender | IBIO | Stock Option (right to buy) | Award | 13,500 | 13,500 | 20 Nov 2025 | Direct | |||
| Alexandra Kropotova | IBIO | Stock Option (right to buy) | Award | 13,500 | 13,500 | 20 Nov 2025 | Direct | |||
| Antonio Bernardino Guimaraes Parada | IBIO | Stock Option (right to buy) | Award | 13,500 | 13,500 | 20 Nov 2025 | Direct | |||
| David Arkowitz | IBIO | Stock Option (right to buy) | Award | 13,500 | 13,500 | 20 Nov 2025 | Direct | |||
| Felipe Duran | IBIO | Stock Option (right to buy) | Award | 75,000 | 75,000 | 20 Oct 2025 | Direct | |||
| Marc Banjak | IBIO | Stock Option (right to buy) | Award | 55,000 | 55,000 | 20 Oct 2025 | Direct | |||
| Martin Brenner | IBIO | Stock Option (right to buy) | Award | 180,000 | 180,000 | 20 Oct 2025 | Direct |
* marks a reported price that did not pass the local price check.