Federated Hermes
PRTA icon

Federated Hermes’s Prothena Corp PRTA Stock Holding History

Federated Hermes’s Portfolio PRTA Stock Details PRTA Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$10.6M Buy
1,084,401
+24,552
+2% +$242K 0.02% 675
2026
Q1 		$10.3M Buy
1,059,849
+85,482
+9% +$783K 0.02% 629
2025
Q4 		$9.31M Buy
974,367
+281,549
+41% +$2.87M 0.02% 635
2025
Q3 		$6.76M Sell
692,818
-488,269
-41% -$3.75M 0.01% 677
2025
Q2 		$7.17M Buy
1,181,087
+634,832
+116% +$4.76M 0.01% 641
2025
Q1 		$6.76M Sell
546,255
-199,922
-27% -$2.83M 0.01% 641
2024
Q4 		$10.3M Buy
746,177
+341,274
+84% +$5.38M 0.02% 543
2024
Q3 		$6.77M Buy
404,903
+361,042
+823% +$7.76M 0.01% 658
2024
Q2 		$905K Buy
+43,861
New +$949K ﹤0.01% 1140
2023
Q4 		– Sell
-9
Closed -$434 – 2172
2023
Q3 		$434 Sell
9
-30,847
-100% -$1.83M ﹤0.01% 2048
2023
Q2 		$2.11M Buy
30,856
+29,850
+2,967% +$1.93M 0.01% 934
2023
Q1 		$48.8K Sell
1,006
-36
-3% -$1.9K ﹤0.01% 1736
2022
Q4 		$62.8K Sell
1,042
-349,095
-100% -$20.4M ﹤0.01% 1692
2022
Q3 		$21.2M Buy
350,137
+345,634
+7,676% +$10.9M 0.06% 367
2022
Q2 		$122K Sell
4,503
-96,726
-96% -$2.83M ﹤0.01% 1598
2022
Q1 		$3.7M Sell
101,229
-19,700
-16% -$710K 0.01% 857
2021
Q4 		$5.97M Sell
120,929
-3,738
-3% -$207K 0.01% 771
2021
Q3 		$8.88M Buy
124,667
+80,996
+185% +$5.03M 0.02% 682
2021
Q2 		$2.25M Buy
+43,671
New +$1.36M ﹤0.01% 1057
2020
Q1 		– Sell
-114
Closed -$2K – 2336
2019
Q4 		$2K Sell
114
-250
-69% -$2.68K ﹤0.01% 2040
2019
Q3 		$3K Sell
364
-140
-28% -$1.24K ﹤0.01% 2007
2019
Q2 		$5K Buy
+504
New +$5.18K ﹤0.01% 1993
2018
Q4 		– Sell
-166
Closed -$2K – 2278
2018
Q3 		$2K Sell
166
-99
-37% -$1.43K ﹤0.01% 2156
2018
Q2 		$4K Buy
+265
New +$5.24K ﹤0.01% 2043
2017
Q4 		– Sell
-3,627
Closed -$235K – 2217
2017
Q3 		$235K Buy
+3,627
New +$222K ﹤0.01% 1480

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Federated Hermes's PRTA Position: Q2 2026 in Review

Federated Hermes increased its Prothena Corp (PRTA) stake by 2.3% in Q2 2026, buying an estimated $242K and bringing the position to 1,084,401 shares worth $10.6M. The position accounts for 0.02% of the portfolio, ranked #675.

Federated Hermes first reported a position in PRTA in Q3 2017 and has held it in 25 quarters since. The position peaked at $21.2M in Q3 2022. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Federated Hermes held 1,084,401 shares of Prothena Corp worth $10.6M as of Q2 2026.
  • Federated Hermes bought 24,552 Prothena Corp shares in Q2 2026, an estimated $242K.
  • Prothena Corp made up 0.02% of Federated Hermes's portfolio in Q2 2026, its #675 holding.
  • Federated Hermes first reported a position in Prothena Corp in Q3 2017 and has held it in 25 quarters since.
  • Federated Hermes's Prothena Corp position peaked at $21.2M in Q3 2022.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Federated Hermes's 13F filing for Q2 2026, filed 12 Aug 2026.