Parallel Advisors’s Prothena Corp PRTA Stock Holding History

Parallel Advisors’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	$2.06K	Sell	210 -86	-29%	-$849	﹤0.01%	3514
2026 Q1	$2.88K	Buy	296 +117	+65%	+$1.07K	﹤0.01%	3247
2025 Q4	$1.71K	Hold	179	–	–	﹤0.01%	3167
2025 Q3	$1.75K	Sell	179 -414	-70%	-$3.18K	﹤0.01%	3086
2025 Q2	$3.6K	Buy	593 +523	+747%	+$3.92K	﹤0.01%	2856
2025 Q1	$866	Hold	70	–	–	﹤0.01%	3154
2024 Q4	$970	Buy	+70	New	+$1.1K	﹤0.01%	3116
2024 Q3	–	Sell	-29	Closed	-$624	–	3456
2024 Q2	$599	Buy	29 +17	+142%	+$368	﹤0.01%	3064
2024 Q1	$297	Buy	+12	New	+$357	﹤0.01%	3114
2023 Q1	–	Sell	-3	Closed	-$181	–	3483
2022 Q4	$181	Sell	3 -992	-100%	-$58.1K	﹤0.01%	3207
2022 Q3	$60K	Hold	995	–	–	﹤0.01%	1182
2022 Q2	$27K	Sell	995 -3	-0.3%	-$88	﹤0.01%	1527
2022 Q1	$36K	Buy	998 +3	+0.3%	+$108	﹤0.01%	1440
2021 Q4	$49K	Hold	995	–	–	﹤0.01%	1331
2021 Q3	$71K	Sell	995 -600	-38%	-$37.3K	﹤0.01%	1126
2021 Q2	$82K	Buy	1,595 +600	+60%	+$18.7K	﹤0.01%	1020
2021 Q1	$25K	Hold	995	–	–	﹤0.01%	1489
2020 Q4	$12K	Sell	995 -113	-10%	-$1.34K	﹤0.01%	1714
2020 Q3	$11K	Hold	1,108	–	–	﹤0.01%	1699
2020 Q2	$11K	Buy	1,108 +995	+881%	+$11.1K	﹤0.01%	1679
2020 Q1	$1K	Hold	113	–	–	﹤0.01%	2319
2019 Q4	$2K	Hold	113	–	–	﹤0.01%	2235
2019 Q3	$1K	Buy	+113	New	+$1K	﹤0.01%	2313
2018 Q2	–	Sell	-375	Closed	-$14K	–	2174
2018 Q1	$14K	Hold	375	–	–	﹤0.01%	1151
2017 Q4	$14K	Hold	375	–	–	﹤0.01%	1166
2017 Q3	$21K	Hold	375	–	–	﹤0.01%	986
2017 Q2	$23K	Hold	375	–	–	﹤0.01%	960
2017 Q1	$20K	Hold	375	–	–	﹤0.01%	961
2016 Q4	$18K	Buy	+375	New	+$20.7K	﹤0.01%	898

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

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

Parallel Advisors's PRTA Position: Q2 2026 in Review

Parallel Advisors reduced its Prothena Corp (PRTA) stake by 29% in Q2 2026, selling an estimated $849 and leaving 210 shares worth $2.06K. The position accounts for ﹤0.01% of the portfolio, ranked #3514.

Parallel Advisors first reported a position in PRTA in Q4 2016 and has held it in 29 quarters since. The position peaked at $82K in Q2 2021. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Parallel Advisors held 210 shares of Prothena Corp worth $2.06K as of Q2 2026.
Parallel Advisors sold 86 Prothena Corp shares in Q2 2026, an estimated $849.
Prothena Corp made up ﹤0.01% of Parallel Advisors's portfolio in Q2 2026, its #3514 holding.
Parallel Advisors first reported a position in Prothena Corp in Q4 2016 and has held it in 29 quarters since.
Parallel Advisors's Prothena Corp position peaked at $82K in Q2 2021.
188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Parallel Advisors's 13F filing for Q2 2026, filed 5 Aug 2026.