Security key
G72800108
PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, $0.01 par value (PRTA)
CUSIP: G72800108
Q3 2025 13F Holders as of 30 Sep 2025
- Security type / class
- Equity / Ordinary Shares, $0.01 par value
- Total 13F shares
- 42,604,772
- Total 13F value
- $415,804,752
- Share change
- +657,532
- Put/Call ratio
- 172%
- SEC-reported price per share
- $9.76
- Number of holders
- 186
- Value change
- +$14,066,211
- Number of buys
- 87
- Number of sells
- 94
- Shares outstanding
- 51,459,275
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2025
Institutions
186
Top holders
10
PRTA full security history
Ownership snapshot
Full 13F holder table
PROTHENA CORP PUBLIC LTD CO SEC filings
PROTHENA CORP PUBLIC LTD CO company facts
Broader feeds
Ownership snapshot
Top reported holders of PRTA - PROTHENA CORP PUBLIC LTD CO - Ordinary Shares, $0.01 par value (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
ADAR1 Capital Management,...
Disclosed value leader
FMR LLC
Comparable rows
15/15
Latest evidence
30 Jun 2025
13F
13D/G
3/4/5
Lead comparable stake: 2.7%
13D/G row: ADAR1 Capital Management, LLC
Showing 1-6 of 15 holder rows.
Quick read
ADAR1 Capital Management, LLC leads the comparable SEC ownership view at 2.7%.
15 of 15 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 ADAR1 Capital Management, LLC's linked filing trail.
Comparable ownership
Top 5
ADAR1 Capital Management, LLC
2.7%
WELLINGTON MANAGEMENT GROUP LLP
0.2%
PRICE T ROWE ASSOCIATES INC /MD/
0.1%
EcoR1 Capital, LLC
10%
FMR LLC
15%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| ADAR1 Capital Management, LLC |
13F
13D/G
Company
|
2.7%
from 13D/G
|
$20,486,305
3,375,009 shares
|
— | 30 Jun 2025 |
| WELLINGTON MANAGEMENT GROUP LLP |
13D/G
13F
Company
|
0.2%
|
$821,299
108,208 shares
|
-$38,122,050 | 30 May 2025 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
T. Rowe Price Associates, Inc. · Company
|
0.1%
|
$449,017
71,047 shares
|
$0 | 30 Jun 2025 |
| EcoR1 Capital, LLC |
3/4/5
10%+ Owner
|
10%
|
$40,544,618
5,304,596 shares
|
— | 02 May 2025 |
| FMR LLC |
13F
Company
|
15%
|
$47,960,393
7,901,218 shares
|
— | 30 Jun 2025 |
| BlackRock, Inc. |
13F
Company
|
7.7%
|
$23,912,147
3,939,398 shares
|
— | 30 Jun 2025 |
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.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
186
Shares
42,604,772
Rows available
186
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q2 2025 Across Filers
Q2 2025 holders
189
Q3 2025 holders
186
Holder diff
-3
| Investor | Q2 2025 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q2 2025 value | Q3 2025 value | Value change | Value Chg % |
|---|