Aquatic Capital Management’s Prothena Corp PRTA Stock Holding History

Aquatic Capital Management’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	$249K	Buy	+25,419	New	+$251K	0.01%	959
2024 Q2	–	Sell	-1,200	Closed	-$29.7K	–	1522
2024 Q1	$29.7K	Sell	1,200 -5,700	-83%	-$170K	﹤0.01%	1074
2023 Q4	$251K	Sell	6,900 -9,200	-57%	-$354K	0.01%	796
2023 Q3	$777K	Buy	+16,100	New	+$957K	0.03%	390
2023 Q2	–	Sell	-7,000	Closed	-$339K	–	1668
2023 Q1	$339K	Sell	7,000 -2,900	-29%	-$153K	0.02%	492
2022 Q4	$596K	Buy	+9,900	New	+$580K	0.04%	458
2022 Q2	–	Sell	-2,000	Closed	-$73K	–	1503
2022 Q1	$73K	Buy	2,000 +1,400	+233%	+$50.5K	0.11%	210
2021 Q4	$30K	Buy	+600	New	+$33.3K	0.06%	474

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

Aquatic Capital Management's PRTA Position: Q2 2026 in Review

Aquatic Capital Management opened a new position in Prothena Corp (PRTA) in Q2 2026: 25,419 shares worth $249K. The stake represents 0.01% of the portfolio and ranks #959 among its holdings. This is a return to the name: Aquatic Capital Management previously reported a position in PRTA as recently as Q1 2024.

Aquatic Capital Management first reported a position in PRTA in Q4 2021 and has held it in 8 quarters since. The position peaked at $777K in Q3 2023. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Aquatic Capital Management held 25,419 shares of Prothena Corp worth $249K as of Q2 2026.
Prothena Corp was a new Aquatic Capital Management position in Q2 2026.
Prothena Corp made up 0.01% of Aquatic Capital Management's portfolio in Q2 2026, its #959 holding.
Aquatic Capital Management first reported a position in Prothena Corp in Q4 2021 and has held it in 8 quarters since.
Aquatic Capital Management's Prothena Corp position peaked at $777K in Q3 2023.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Aquatic Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.