STATE OF WISCONSIN INVESTMENT BOARD
Position in PRTA — Prothena Corp Public Ltd Co
CIK 854157
MADISON, WI
Position in PRTA
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$688,491
+$57,236 QoQ
Shares Held
70,326
-32.4% QoQ
Ownership
0.137%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#56
of 187 holders
Holding Since
Mar 2020
21 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in PRTA Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026STATE OF WISCONSIN INVESTMENT BOARD holds $511,704,326 across 163 Biotechnology names. PRTA ranks #119 (0.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
135,798 | $67,454,940 | |
| 2 | REGN |
Regeneron Pharmaceuticals, Inc.
|
55,287 | $34,473,655 | |
| 3 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
70,171 | $21,123,576 | |
| 4 | RVMD |
Revolution Medicines, Inc.
|
83,892 | $15,711,293 | |
| 5 | XENE |
Xenon Pharmaceuticals Inc.
|
248,821 | $15,018,835 | |
| 6 | MRNA |
Moderna, Inc.
|
207,705 | $14,545,581 | |
| 7 | INSM |
INSMED Inc
|
118,057 | $12,587,237 | |
| 8 | RPRX |
Royalty Pharma plc
|
213,373 | $11,963,824 |
All Filings in PRTA
Export CSV
21 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $688,491 | 70,326 | Shares | Sole | 2026-08-14 | |
| 2025-06-30 | $631,255 | 103,996 | Shares | Sole | 2025-08-14 | |
| 2024-09-30 | $458,418 | 27,401 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $565,556 | 27,401 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $821,348 | 33,159 | Shares | Sole | 2024-05-14 | |
| 2023-12-31 | $1,190,389 | 32,757 | Shares | Sole | 2024-02-12 | |
| 2023-09-30 | $2,160,249 | 44,772 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $2,870,491 | 42,040 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $1,511,730 | 31,189 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $1,987,948 | 32,995 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $2,989,665 | 49,310 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $952,503 | 35,083 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $1,769,988 | 48,400 | Shares | Sole | 2022-05-13 | |
| 2021-12-31 | $2,331,680 | 47,200 | Shares | Sole | 2022-02-11 | |
| 2021-09-30 | $3,262,334 | 45,800 | Shares | Sole | 2021-11-12 | |
| 2021-06-30 | $2,519,090 | 49,000 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $1,042,480 | 41,500 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $517,631 | 43,100 | Shares | Sole | 2021-02-03 | |
| 2020-09-30 | $619,380 | 62,000 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $648,520 | 62,000 | Shares | Sole | 2020-08-12 | |
| 2020-03-31 | $663,400 | 62,000 | Shares | Sole | 2020-05-06 | |
| No filing history on record for this holder in this stock. | ||||||