WhitTier Trust Company’s Prothena Corp PRTA Stock Holding History

WhitTier Trust Company’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 Q3	–	Sell	-3	Closed	-$18	–	1444
2025 Q2	$18	Hold	3	–	–	﹤0.01%	1439
2025 Q1	$37	Hold	3	–	–	﹤0.01%	1411
2024 Q4	$41	Hold	3	–	–	﹤0.01%	1342
2024 Q3	$50	Hold	3	–	–	﹤0.01%	1338
2024 Q2	$61	Hold	3	–	–	﹤0.01%	1268
2024 Q1	$74	Hold	3	–	–	﹤0.01%	1210
2023 Q4	$109	Hold	3	–	–	﹤0.01%	1194
2023 Q3	$144	Hold	3	–	–	﹤0.01%	1148
2023 Q2	$204	Hold	3	–	–	﹤0.01%	1158
2023 Q1	$145	Hold	3	–	–	﹤0.01%	1147
2022 Q4	$180	Hold	3	–	–	﹤0.01%	1167
2022 Q3	$0	Hold	3	–	–	﹤0.01%	1162
2022 Q2	$0	Hold	3	–	–	﹤0.01%	1165
2022 Q1	$0	Hold	3	–	–	﹤0.01%	1124
2021 Q4	$0	Hold	3	–	–	﹤0.01%	1104
2021 Q3	$0	Hold	3	–	–	﹤0.01%	1122
2021 Q2	$0	Hold	3	–	–	﹤0.01%	1015
2021 Q1	$0	Hold	3	–	–	﹤0.01%	998
2020 Q4	$0	Hold	3	–	–	﹤0.01%	996
2020 Q3	$0	Hold	3	–	–	﹤0.01%	979
2020 Q2	$0	Hold	3	–	–	﹤0.01%	982
2020 Q1	$0	Hold	3	–	–	﹤0.01%	1017
2019 Q4	$0	Hold	3	–	–	﹤0.01%	1015
2019 Q3	$0	Hold	3	–	–	﹤0.01%	1008
2019 Q2	$0	Hold	3	–	–	﹤0.01%	1004
2019 Q1	$0	Hold	3	–	–	﹤0.01%	1044
2018 Q4	$0	Hold	3	–	–	﹤0.01%	1075
2018 Q3	$0	Hold	3	–	–	﹤0.01%	956
2018 Q2	$0	Hold	3	–	–	﹤0.01%	992
2018 Q1	$0	Hold	3	–	–	﹤0.01%	1034
2017 Q4	$0	Hold	3	–	–	﹤0.01%	1004
2017 Q3	$0	Hold	3	–	–	﹤0.01%	1001
2017 Q2	$0	Hold	3	–	–	﹤0.01%	933
2017 Q1	$0	Hold	3	–	–	﹤0.01%	947
2016 Q4	$0	Hold	3	–	–	﹤0.01%	969
2016 Q3	$0	Hold	3	–	–	﹤0.01%	910
2016 Q2	$0	Hold	3	–	–	﹤0.01%	914
2016 Q1	$0	Hold	3	–	–	﹤0.01%	901
2015 Q4	$0	Hold	3	–	–	﹤0.01%	900
2015 Q3	$0	Hold	3	–	–	﹤0.01%	901
2015 Q2	$0	Hold	3	–	–	﹤0.01%	902
2015 Q1	$0	Hold	3	–	–	﹤0.01%	900
2014 Q4	$0	Hold	3	–	–	﹤0.01%	901
2014 Q3	$0	Hold	3	–	–	﹤0.01%	899
2014 Q2	$0	Hold	3	–	–	﹤0.01%	907
2014 Q1	$0	Hold	3	–	–	﹤0.01%	929
2013 Q4	$0	Hold	3	–	–	﹤0.01%	891
2013 Q3	$0	Hold	3	–	–	﹤0.01%	877
2013 Q2	$0	Buy	+3	New	+$28	﹤0.01%	864

Other funds holding PRTA

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return

RCMNY

Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return

ACM

ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

WhitTier Trust Company's PRTA Position: Q3 2025 in Review

WhitTier Trust Company sold out of Prothena Corp (PRTA) in Q3 2025, closing a stake of 3 shares — an estimated $18 sold.

WhitTier Trust Company first reported a position in PRTA in Q2 2013 and held it in 49 quarters. The position peaked at $204 in Q2 2023. 187 funds tracked by Wall St. Rank hold PRTA as of Q3 2025.

WhitTier Trust Company reported no remaining Prothena Corp position as of Q3 2025 after selling out during the quarter.
WhitTier Trust Company sold 3 Prothena Corp shares in Q3 2025, an estimated $18.
WhitTier Trust Company first reported a position in Prothena Corp in Q2 2013 and held it in 49 quarters.
WhitTier Trust Company's Prothena Corp position peaked at $204 in Q2 2023.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2025.

Based on WhitTier Trust Company's 13F filing for Q3 2025, filed 31 Oct 2025.