State of Wisconsin Investment Board’s Prothena Corp PRTA Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2025
Q3 | – | Sell |
-103,996
| Closed | -$631K | – | 2493 |
|
|
2025
Q2 | $631K | Buy |
+103,996
| New | +$780K | ﹤0.01% | 1757 |
|
|
2024
Q4 | – | Sell |
-27,401
| Closed | -$458K | – | 2357 |
|
|
2024
Q3 | $458K | Hold |
27,401
| – | – | ﹤0.01% | 1911 |
|
|
2024
Q2 | $566K | Sell |
27,401
-5,758
| -17% | -$125K | ﹤0.01% | 1759 |
|
|
2024
Q1 | $821K | Buy |
33,159
+402
| +1% | +$12K | ﹤0.01% | 1494 |
|
|
2023
Q4 | $1.19M | Sell |
32,757
-12,015
| -27% | -$462K | ﹤0.01% | 1345 |
|
|
2023
Q3 | $2.16M | Buy |
44,772
+2,732
| +6% | +$162K | 0.01% | 1233 |
|
|
2023
Q2 | $2.87M | Buy |
42,040
+10,851
| +35% | +$700K | 0.01% | 1189 |
|
|
2023
Q1 | $1.51M | Sell |
31,189
-1,806
| -5% | -$95.4K | ﹤0.01% | 1371 |
|
|
2022
Q4 | $1.99M | Sell |
32,995
-16,315
| -33% | -$955K | 0.01% | 1322 |
|
|
2022
Q3 | $2.99M | Buy |
49,310
+14,227
| +41% | +$450K | 0.01% | 1195 |
|
|
2022
Q2 | $953K | Sell |
35,083
-13,317
| -28% | -$390K | ﹤0.01% | 1667 |
|
|
2022
Q1 | $1.77M | Buy |
48,400
+1,200
| +3% | +$43.3K | ﹤0.01% | 1531 |
|
|
2021
Q4 | $2.33M | Buy |
47,200
+1,400
| +3% | +$77.6K | ﹤0.01% | 1243 |
|
|
2021
Q3 | $3.26M | Sell |
45,800
-3,200
| -7% | -$199K | 0.01% | 1168 |
|
|
2021
Q2 | $2.52M | Buy |
49,000
+7,500
| +18% | +$234K | 0.01% | 1234 |
|
|
2021
Q1 | $1.04M | Sell |
41,500
-1,600
| -4% | -$30.1K | ﹤0.01% | 1354 |
|
|
2020
Q4 | $518K | Sell |
43,100
-18,900
| -30% | -$224K | ﹤0.01% | 1528 |
|
|
2020
Q3 | $619K | Hold |
62,000
| – | – | ﹤0.01% | 1406 |
|
|
2020
Q2 | $649K | Hold |
62,000
| – | – | ﹤0.01% | 1351 |
|
|
2020
Q1 | $663K | Buy |
62,000
+1,700
| +3% | +$20.6K | ﹤0.01% | 1277 |
|
|
2019
Q4 | $955K | Hold |
60,300
| – | – | ﹤0.01% | 1255 |
|
|
2019
Q3 | $473K | Buy |
60,300
+5,300
| +10% | +$47.1K | ﹤0.01% | 1345 |
|
|
2019
Q2 | $581K | Buy |
55,000
+1,200
| +2% | +$12.3K | ﹤0.01% | 1284 |
|
|
2019
Q1 | $653K | Buy |
53,800
+12,300
| +30% | +$154K | ﹤0.01% | 1277 |
|
|
2018
Q4 | $427K | Buy |
41,500
+600
| +1% | +$7.13K | ﹤0.01% | 1358 |
|
|
2018
Q3 | $535K | Hold |
40,900
| – | – | ﹤0.01% | 1386 |
|
|
2018
Q2 | $596K | Buy |
40,900
+3,000
| +8% | +$59.3K | ﹤0.01% | 1316 |
|
|
2018
Q1 | $1.39M | Hold |
37,900
| – | – | ﹤0.01% | 1034 |
|
|
2017
Q4 | $1.42M | Buy |
37,900
+10,900
| +40% | +$555K | ﹤0.01% | 1027 |
|
|
2017
Q3 | $1.75M | Hold |
27,000
| – | – | 0.01% | 980 |
|
|
2017
Q2 | $1.46M | Buy |
+27,000
| New | +$1.44M | ﹤0.01% | 981 |
|
Other funds holding PRTA
AC
RCMNY
ACM
PAI
State of Wisconsin Investment Board's PRTA Position: Q3 2025 in Review
State of Wisconsin Investment Board sold out of Prothena Corp (PRTA) in Q3 2025, closing a stake of 103,996 shares — an estimated $631K sold.
State of Wisconsin Investment Board first reported a position in PRTA in Q2 2017 and held it in 31 quarters. The position peaked at $3.26M in Q3 2021. 187 funds tracked by Wall St. Rank hold PRTA as of Q3 2025.
- State of Wisconsin Investment Board reported no remaining Prothena Corp position as of Q3 2025 after selling out during the quarter.
- State of Wisconsin Investment Board sold 103,996 Prothena Corp shares in Q3 2025, an estimated $631K.
- State of Wisconsin Investment Board first reported a position in Prothena Corp in Q2 2017 and held it in 31 quarters.
- State of Wisconsin Investment Board's Prothena Corp position peaked at $3.26M in Q3 2021.
- 187 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2025.
Based on State of Wisconsin Investment Board's 13F filing for Q3 2025, filed 14 Nov 2025.