Harbor Investment Advisory’s Prothena Corp PRTA Stock Holding History

Harbor Investment Advisory’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	$979	Hold	100	–	–	﹤0.01%	1233
2026 Q1	$972	Hold	100	–	–	﹤0.01%	1149
2025 Q4	$955	Hold	100	–	–	﹤0.01%	1171
2025 Q3	$976	Hold	100	–	–	﹤0.01%	1130
2025 Q2	$607	Hold	100	–	–	﹤0.01%	1139
2025 Q1	$1.24K	Hold	100	–	–	﹤0.01%	1106
2024 Q4	$1.39K	Hold	100	–	–	﹤0.01%	1083
2024 Q3	$1.67K	Hold	100	–	–	﹤0.01%	1079
2024 Q2	$2.06K	Hold	100	–	–	﹤0.01%	1071
2024 Q1	$2.48K	Hold	100	–	–	﹤0.01%	1062
2023 Q4	$3.63K	Hold	100	–	–	﹤0.01%	984
2023 Q3	$4.83K	Hold	100	–	–	﹤0.01%	927
2023 Q2	$6.83K	Hold	100	–	–	﹤0.01%	1082
2023 Q1	$4.85K	Hold	100	–	–	﹤0.01%	1137
2022 Q4	$6.03K	Hold	100	–	–	﹤0.01%	1082
2022 Q3	$6K	Hold	100	–	–	﹤0.01%	1115
2022 Q2	$3K	Hold	100	–	–	﹤0.01%	1214
2022 Q1	$4K	Hold	100	–	–	﹤0.01%	1191
2021 Q4	$5K	Hold	100	–	–	﹤0.01%	1147
2021 Q3	$7K	Hold	100	–	–	﹤0.01%	1119
2021 Q2	$5K	Hold	100	–	–	﹤0.01%	1100
2021 Q1	$3K	Hold	100	–	–	﹤0.01%	1133
2020 Q4	$1K	Hold	100	–	–	﹤0.01%	1171
2020 Q3	$1K	Hold	100	–	–	﹤0.01%	1098
2020 Q2	$1K	Hold	100	–	–	﹤0.01%	1103
2020 Q1	$1K	Hold	100	–	–	﹤0.01%	983
2019 Q4	$2K	Buy	+100	New	+$1.07K	﹤0.01%	784

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 $3.38T AUM 44.17% 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

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 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

Harbor Investment Advisory's PRTA Position: Q2 2026 in Review

Harbor Investment Advisory held its Prothena Corp (PRTA) position steady in Q2 2026 at 100 shares worth $979. The position accounts for ﹤0.01% of the portfolio, ranked #1233.

Harbor Investment Advisory first reported a position in PRTA in Q4 2019 and has held it in 27 quarters since. The position peaked at $7K in Q3 2021. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Harbor Investment Advisory held 100 shares of Prothena Corp worth $979 as of Q2 2026.
Harbor Investment Advisory left its Prothena Corp share count unchanged in Q2 2026.
Prothena Corp made up ﹤0.01% of Harbor Investment Advisory's portfolio in Q2 2026, its #1233 holding.
Harbor Investment Advisory first reported a position in Prothena Corp in Q4 2019 and has held it in 27 quarters since.
Harbor Investment Advisory's Prothena Corp position peaked at $7K in Q3 2021.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Harbor Investment Advisory's 13F filing for Q2 2026, filed 7 Jul 2026.