Zurich Cantonal Bank’s Prothena Corp PRTA Stock Holding History

Zurich Cantonal Bank’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
2025 Q4	–	Sell	-71	Closed	-$723	–	3293
2025 Q3	$693	Sell	71 -15,497	-100%	-$119K	﹤0.01%	2531
2025 Q2	$94.5K	Sell	15,568 -472	-3%	-$3.54K	﹤0.01%	2391
2025 Q1	$198K	Buy	16,040 +10	+0.1%	+$141	﹤0.01%	2108
2024 Q4	$222K	Buy	16,030 +5,794	+57%	+$91.4K	﹤0.01%	2110
2024 Q3	$171K	Hold	10,236	–	–	﹤0.01%	2193
2024 Q2	$211K	Buy	10,236 +1,186	+13%	+$25.7K	﹤0.01%	2013
2024 Q1	$224K	Sell	9,050 -513	-5%	-$15.3K	﹤0.01%	1994
2023 Q4	$348K	Buy	9,563 +2,099	+28%	+$80.8K	﹤0.01%	1746
2023 Q3	$360K	Buy	7,464 +797	+12%	+$47.4K	﹤0.01%	1604
2023 Q2	$455K	Buy	6,667 +862	+15%	+$55.6K	﹤0.01%	1411
2023 Q1	$281K	Buy	5,805 +419	+8%	+$22.1K	﹤0.01%	1662
2022 Q4	$325K	Buy	5,386 +1,178	+28%	+$69K	﹤0.01%	1518
2022 Q3	$255K	Sell	4,208 -2,798	-40%	-$88.5K	﹤0.01%	1608
2022 Q2	$190K	Hold	7,006	–	–	﹤0.01%	1818
2022 Q1	$256K	Sell	7,006 -1,220	-15%	-$44K	﹤0.01%	1734
2021 Q4	$406K	Buy	8,226 +3,415	+71%	+$189K	﹤0.01%	1614
2021 Q3	$343K	Buy	4,811 +2,724	+131%	+$169K	﹤0.01%	1546
2021 Q2	$107K	Hold	2,087	–	–	﹤0.01%	2190
2021 Q1	$52K	Hold	2,087	–	–	﹤0.01%	2373
2020 Q4	$25K	Hold	2,087	–	–	﹤0.01%	2560
2020 Q3	$21K	Hold	2,087	–	–	﹤0.01%	2490
2020 Q2	$22K	Hold	2,087	–	–	﹤0.01%	2446
2020 Q1	$22K	Hold	2,087	–	–	﹤0.01%	2328
2019 Q4	$33K	Hold	2,087	–	–	﹤0.01%	2341
2019 Q3	$16K	Hold	2,087	–	–	﹤0.01%	2497
2019 Q2	$22K	Hold	2,087	–	–	﹤0.01%	2447
2019 Q1	$25K	Sell	2,087 -1,113	-35%	-$13.9K	﹤0.01%	2350
2018 Q4	$33K	Hold	3,200	–	–	﹤0.01%	2254
2018 Q3	$42K	Hold	3,200	–	–	﹤0.01%	2247
2018 Q2	$47K	Hold	3,200	–	–	﹤0.01%	2171
2018 Q1	$117K	Hold	3,200	–	–	﹤0.01%	1510
2017 Q4	$120K	Buy	3,200 +825	+35%	+$42K	﹤0.01%	1475
2017 Q3	$154K	Hold	2,375	–	–	﹤0.01%	1144
2017 Q2	$129K	Buy	2,375 +1,549	+188%	+$82.5K	﹤0.01%	1207
2017 Q1	$46K	Hold	826	–	–	﹤0.01%	1786
2016 Q4	$41K	Hold	826	–	–	﹤0.01%	1826
2016 Q3	$50K	Buy	826 +117	+17%	+$6.28K	﹤0.01%	1639
2016 Q2	$25K	Hold	709	–	–	﹤0.01%	1934
2016 Q1	$29K	Hold	709	–	–	﹤0.01%	1763
2015 Q4	$48K	Buy	709 +390	+122%	+$23.5K	﹤0.01%	1472
2015 Q3	$14K	Buy	319 +147	+85%	+$8.56K	﹤0.01%	1687
2015 Q2	$9K	Buy	+172	New	+$6.79K	﹤0.01%	1458

Other funds holding PRTA

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 New York $6.73T AUM 46.02% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

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

Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Zurich Cantonal Bank's PRTA Position: Q4 2025 in Review

Zurich Cantonal Bank sold out of Prothena Corp (PRTA) in Q4 2025, closing a stake of 71 shares — an estimated $723 sold.

Zurich Cantonal Bank first reported a position in PRTA in Q2 2015 and held it in 42 quarters. The position peaked at $455K in Q2 2023. 181 funds tracked by Wall St. Rank hold PRTA as of Q4 2025.

Zurich Cantonal Bank reported no remaining Prothena Corp position as of Q4 2025 after selling out during the quarter.
Zurich Cantonal Bank sold 71 Prothena Corp shares in Q4 2025, an estimated $723.
Zurich Cantonal Bank first reported a position in Prothena Corp in Q2 2015 and held it in 42 quarters.
Zurich Cantonal Bank's Prothena Corp position peaked at $455K in Q2 2023.
181 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2025.

Based on Zurich Cantonal Bank's 13F filing for Q4 2025, filed 27 Jan 2026.