Security key
G72800108
PROTHENA CORP PUBLIC LTD CO - Common Stock (PRTA)
CUSIP: G72800108
Q3 2021 13F Holders as of 30 Sep 2021
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 40,926,820
- Total 13F value
- $2,915,195,629
- Share change
- +508,597
- Put/Call ratio
- 64%
- SEC-reported price per share
- $71.23
- Number of holders
- 178
- Value change
- +$43,595,404
- Number of buys
- 101
- Number of sells
- 60
- Shares outstanding
- 51,992,464
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 2021
Institutions
178
Top holders
10
PRTA full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2026
PROTHENA CORP PUBLIC LTD CO SEC filings
PROTHENA CORP PUBLIC LTD CO company facts
Broader feeds
Reporting periods
Holder history for CUSIP G72800108
Recent filing periods:
Ownership snapshot
Top reported holders of PRTA - PROTHENA CORP PUBLIC LTD CO - Common Stock (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
EcoR1 Capital, LLC
Disclosed value leader
EcoR1 Capital, LLC
Comparable rows
15/15
Latest evidence
30 Jun 2021
13F
Lead comparable stake: 22%
Showing 1-6 of 15 holder rows.
Quick read
EcoR1 Capital, LLC leads the comparable SEC ownership view at 22%.
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 EcoR1 Capital, LLC's linked filing trail.
Comparable ownership
Top 5
EcoR1 Capital, LLC
22%
PRICE T ROWE ASSOCIATES INC /MD/
11%
BlackRock Finance, Inc.
7.1%
FMR LLC
5.3%
First Light Asset Management, LLC
3.7%
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 |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC |
13F
Company
|
22%
|
$580,125,000
11,284,280 shares
|
— | 30 Jun 2021 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
Company
|
11%
|
$299,365,000
5,823,085 shares
|
— | 30 Jun 2021 |
| BlackRock Finance, Inc. |
13F
Company
|
7.1%
|
$189,285,000
3,681,848 shares
|
— | 30 Jun 2021 |
| FMR LLC |
13F
Company
|
5.3%
|
$142,832,000
2,778,287 shares
|
— | 30 Jun 2021 |
| First Light Asset Management, LLC |
13F
Company
|
3.7%
|
$99,110,000
1,927,829 shares
|
— | 30 Jun 2021 |
| Palo Alto Investors LP |
13F
Company
|
3.3%
|
$89,015,000
1,731,482 shares
|
— | 30 Jun 2021 |
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 2021
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
178
Shares
40,926,820
Rows available
178
| 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 2021 vs Q2 2021 Across Filers
Q2 2021 holders
145
Q3 2021 holders
178
Holder diff
33
| Investor | Q2 2021 Shares | Q3 2021 Shares | Share Diff | Share Chg % | Q2 2021 value | Q3 2021 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend