Prothena Corporation plc
US ˙ NasdaqGS ˙ IE00B91XRN20

SecurityPRTA / Prothena Corporation plc
InstitutionONEQ - Fidelity Nasdaq Composite Index Tracking Stock
Latest Disclosed Ownership30,853 shares
Latest Disclosed Value $ 141,615
ONEQ - Fidelity Nasdaq Composite Index Tracking Stock reports 27,695.50% increase in ownership of PRTA / Prothena Corporation plc

On July 24, 2025 - ONEQ - Fidelity Nasdaq Composite Index Tracking Stock filed a NPORT-P form disclosing ownership of 30,853 shares of Prothena Corporation plc (US:PRTA) valued at $141,615 USD as of May 31, 2025. The entity filed a previous NPORT-P on April 25, 2025 disclosing 111 shares of Prothena Corporation plc. This represents a change in shares of 27,695.50% during the quarter. The current value of the position is $271,198 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2025-07-24 2025-05-31 NP PROTHENA CORP EC IE00B91XRN20 30,853 30,742 27,695.50 142 14,000.00 0.0019
2025-04-25 2025-02-28 NP PROTHENA CORP EC IE00B91XRN20 111 0 0.00 2 0.00 0.0000
2025-01-27 2024-11-30 NP PROTHENA CORP EC IE00B91XRN20 111 0 0.00 2 -50.00 0.0000
2024-10-29 2024-08-31 NP PROTHENA CORP EC IE00B91XRN20 111 -15,025 -99.27 2 -99.36 0.0000
2024-07-26 2024-05-31 NP PROTHENA CORP EC IE00B91XRN20 15,136 175 1.17 315 -23.79 0.0050
2024-04-24 2024-02-29 NP PROTHENA CORP EC IE00B91XRN20 14,961 217 1.47 413 -14.17 0.0069
2024-01-24 2023-11-30 NP PROTHENA CORP EC IE00B91XRN20 14,744 21 0.14 480 -38.22 0.0092
2023-10-27 2023-08-31 NP PROTHENA CORP EC IE00B91XRN20 14,723 210 1.45 778 -19.40 0.0152
2023-07-26 2023-05-31 NP PROTHENA CORP EC IE00B91XRN20 14,513 42 0.29 964 19.60 0.0208
2023-04-27 2023-02-28 NP PROTHENA CORP EC IE00B91XRN20 14,471 14,471 807 0.0197
2022-04-28 2022-02-28 NP PROTHENA CORP EC IE00B91XRN20 0 -23,476 -100.00 0 -100.00
2022-01-25 2021-11-30 NP PROTHENA CORP EC IE00B91XRN20 23,476 602 2.63 1,177 -23.32 0.0246
2021-10-26 2021-08-31 NP PROTHENA CORP EC IE00B91XRN20 22,874 7,148 45.45 1,535 656.16 0.0336
2020-10-16 2020-08-31 NP PROTHENA CORP EC IE00B91XRN20 15,726 803 5.38 204 27.67 0.0063
2020-07-20 2020-05-31 NP PROTHENA CORP EC IE00B91XRN20 14,923 441 3.05 159 3.25 0.0062
2020-04-24 2020-02-29 NP PROTHENA CORP EC IE00B91XRN20 14,482 11,540 392.25 154 316.22 0.0069
2020-01-16 2019-11-30 NP PROTHENA CORP EC IE00B91XRN20 2,942 2,942 38 0.0017
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.