Prothena Ownership | Who Owns Prothena?
Prothena Ownership Summary
Prothena is owned by 4.58% institutional investors, 19.01% insiders, and 76.41% retail investors. Ecor1 capital is the largest institutional shareholder, holding 21.54% of PRTA shares. Vanguard Health Care Inv is the top mutual fund, with 7.77% of its assets in Prothena shares.
PRTA Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Prothena | 4.58% | 19.01% | 76.41% |
| Sector | Healthcare Stocks | 279.19% | 10.62% | -189.81% |
| Industry | Biotech Stocks | 63.96% | 10.74% | 25.30% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Ecor1 capital | 11.58M | 21.54% | $160.44M |
| Fmr | 8.07M | 15.01% | $111.79M |
| Wellington management group llp | 5.13M | 9.54% | $71.06M |
| Blackrock funding, inc. /de | 4.12M | 7.66% | $57.09M |
| Blackrock | 3.86M | 7.18% | $79.61M |
| Price t rowe associates inc /md/ | 3.69M | 6.85% | $51.05M |
| Armistice capital | 2.24M | 4.16% | $30.97M |
| State street | 1.93M | 3.60% | $39.89M |
| Palo alto investors lp | 1.66M | 3.08% | $20.54M |
| Vanguard group | 1.40M | 2.61% | $19.44M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Ecor1 capital | 11.58M | 6.07% | $160.44M |
| Palo alto investors lp | 1.66M | 3.91% | $20.54M |
| Birchview capital, lp | 332.97K | 3.58% | $4.12M |
| Prosight management, lp | 408.12K | 1.66% | $5.05M |
| Boxer capital | 690.00K | 0.75% | $14.24M |
| Dcf advisers | 103.50K | 0.69% | $1.43M |
| Siren | 1.10M | 0.67% | $15.23M |
| Finepoint capital lp | 657.07K | 0.56% | $9.10M |
| Artal group | 1.00M | 0.53% | $20.67M |
| Armistice capital | 2.24M | 0.42% | $30.97M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Wellington management group llp | 5.13M | 0.01% | 952.09K |
| Armistice capital | 2.24M | 0.42% | 586.00K |
| Federated hermes | 746.18K | 0.02% | 341.27K |
| Ubs group | 371.29K | 0.00% | 308.78K |
| Finepoint capital lp | 657.07K | 0.56% | 223.60K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| State street | 1.93M | 0.00% | -1.54M |
| First light asset management | - | - | -444.95K |
| Granahan investment management | - | - | -312.52K |
| Ubs asset management americas | 381.51K | 0.00% | -145.24K |
| Deep track capital, lp | - | - | -140.00K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Susquehanna fundamental investments | 80.68K | 0.02% | 80.68K | $1.12M |
| Norges bank | 57.45K | 0.00% | 57.45K | $795.74K |
| Hennion & walsh asset management | 52.28K | 0.03% | 52.28K | $724.13K |
| Massachusetts financial services co /ma/ | 44.81K | 0.00% | 44.81K | $620.69K |
| Cresset asset management | 28.30K | 0.00% | 28.30K | $584.07K |
Sold Out
| Holder | Change |
|---|---|
| Jfs wealth advisors | -2.00 |
| Cypress capital | -2.00 |
| First manhattan co. llc. | -3.00 |
| Register financial advisors | -4.00 |
| Colonial trust advisors | -7.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2025 | 6 | -96.69% | 2,463,987 | -95.40% | 4 | 0.05% | 2 | -98.06% | 4 | -88.89% |
| Dec 31, 2024 | 107 | -35.93% | 25,474,325 | -49.96% | 47 | 0.53% | 63 | -12.50% | 19 | -57.78% |
| Sep 30, 2024 | 166 | 0.61% | 50,906,096 | 0.22% | 94 | 1.06% | 71 | -18.39% | 45 | 9.76% |
| Jun 30, 2024 | 165 | -4.07% | 50,796,433 | -4.91% | 94 | 0.96% | 87 | 12.99% | 41 | -34.92% |
| Mar 31, 2024 | 172 | -16.91% | 53,421,456 | -0.25% | 99 | 1.00% | 77 | -33.04% | 63 | 31.25% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard Health Care Inv | 4.18M | 7.77% | -39.90K |
| Fidelity Growth Compy Commingled Pl S | 3.37M | 6.27% | - |
| Fidelity Growth Compy Commingled Pl O | 3.28M | 6.09% | 1.22K |
| Fidelity Growth Company Fund | 2.32M | 4.31% | - |
| T. Rowe Price New Horizons | 1.64M | 3.04% | -251.35K |
| US Small-Cap Growth II Equity Comp | 1.64M | 3.04% | -251.90K |
| iShares Russell 2000 ETF | 1.09M | 2.03% | 537.00 |
| Fidelity Growth Company K6 | 805.87K | 1.50% | - |
| Fidelity Series Growth Company | 758.90K | 1.41% | - |
| Fidelity Select Biotechnology | 684.02K | 1.27% | -54.10K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| May 06, 2025 | EcoR1 Capital, LLC | - | Sell | $15.16M |
| May 05, 2025 | EcoR1 Capital, LLC | - | Sell | $7.93M |
| May 02, 2025 | EcoR1 Capital, LLC | - | Sell | $27.74M |
| Dec 31, 2024 | SCULLY WILLIAM P | - | Buy | $389.64K |
| Dec 18, 2024 | SCULLY WILLIAM P | - | Buy | $1.02M |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q2 | - | 3 |
| 2025 Q1 | 1 | - |
| 2024 Q4 | - | - |
| 2024 Q3 | - | - |
| 2024 Q2 | - | - |
PRTA Ownership FAQ
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