프로테나 코퍼레이션 plc
US ˙ NasdaqGS ˙ IE00B91XRN20

SecurityPRTA / Prothena Corporation plc
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership73,244 shares
Latest Disclosed Value $ 444,591
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series ownership in PRTA / Prothena Corporation plc

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 73,244 shares of Prothena Corporation plc (US:PRTA) valued at $444,591 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 28, 2025 disclosing 73,244 shares of Prothena Corporation plc. This represents a change in shares of 0.00% during the quarter. The current value of the position is $643,815 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)
2025-08-26 2025-06-30 NP Prothena Corp EC IE00B91XRN20 73,244 0 0.00 445 -50.99 0.0100
2025-05-28 2025-03-31 NP Prothena Corp EC IE00B91XRN20 73,244 2,873 4.08 906 -6.98 0.0217
2025-02-25 2024-12-31 NP Prothena Corp EC IE00B91XRN20 70,371 -13,850 -16.44 975 -30.87 0.0213
2024-11-26 2024-09-30 NP Prothena Corp EC IE00B91XRN20 84,221 3,220 3.98 1,409 -15.68 0.0266
2024-08-26 2024-06-30 NP Prothena Corp EC IE00B91XRN20 81,001 6,662 8.96 1,672 -9.23 0.0340
2024-05-28 2024-03-31 NP Prothena Corp EC IE00B91XRN20 74,339 -1,713 -2.25 1,841 -33.37 0.0384
2024-02-26 2023-12-31 NP Prothena Corp EC IE00B91XRN20 76,052 5,753 8.18 2,764 -18.52 0.0590
2023-11-28 2023-09-30 NP Prothena Corp EC IE00B91XRN20 70,299 -1,311 -1.83 3,392 -30.64 0.0885
2023-08-25 2023-06-30 NP Prothena Corp EC IE00B91XRN20 71,610 9,395 15.10 4,890 62.16 0.1160
2023-05-26 2023-03-31 NP Prothena Corp EC IE00B91XRN20 62,215 4,730 8.23 3,016 -12.94 0.0803
2023-02-24 2022-12-31 NP Prothena Corp EC IE00B91XRN20 57,485 1,451 2.59 3,463 1.94 0.0953
2022-11-25 2022-09-30 NP Prothena Corp EC IE00B91XRN20 56,034 1,228 2.24 3,397 128.45 0.0973
2022-08-25 2022-06-30 NP Prothena Corp EC IE00B91XRN20 54,806 -1,067 -1.91 1,488 -27.21 0.0411
2022-05-26 2022-03-31 NP Prothena Corp EC IE00B91XRN20 55,873 431 0.78 2,043 -25.38 0.0476
2022-02-25 2021-12-31 NP Prothena Corp EC IE00B91XRN20 55,442 935 1.72 2,739 -29.47 0.0594
2021-11-24 2021-09-30 NP Prothena Corp EC IE00B91XRN20 54,507 4,325 8.62 3,883 50.52 0.0855
2021-08-26 2021-06-30 NP Prothena Corp EC IE00B91XRN20 50,182 4,442 9.71 2,580 124.65 0.0553
2021-05-27 2021-03-31 NP Prothena Corp EC IE00B91XRN20 45,740 0 0.00 1,149 109.11 0.0261
2021-02-25 2020-12-31 NP Prothena Corp EC IE00B91XRN20 45,740 -8,572 -15.78 549 1.29 0.0141
2020-11-25 2020-09-30 NP Prothena Corp EC IE00B91XRN20 54,312 0 0.00 543 -4.58 0.0174
2020-08-27 2020-06-30 NP Prothena Corp EC IE00B91XRN20 54,312 -12,357 -18.53 568 -20.34 0.0186
2020-06-01 2020-03-31 NP Prothena Corp EC IE00B91XRN20 66,669 5,702 9.35 713 49.48 0.0292
2019-11-27 2019-09-30 NP Prothena Corp EC IE00B91XRN20 60,967 60,967 478 0.0158
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.