RBF Capital’s Prothena Corp PRTA Stock Holding History

RBF Capital’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	$286K	Hold	29,200	–	–	0.01%	451
2026 Q1	$284K	Hold	29,200	–	–	0.01%	426
2025 Q4	$279K	Hold	29,200	–	–	0.01%	485
2025 Q3	$285K	Hold	29,200	–	–	0.01%	479
2025 Q2	$177K	Hold	29,200	–	–	0.01%	544
2025 Q1	$361K	Hold	29,200	–	–	0.02%	434
2024 Q4	$404K	Sell	29,200 -16,162	-36%	-$255K	0.02%	425
2024 Q3	$759K	Hold	45,362	–	–	0.04%	340
2024 Q2	$936K	Hold	45,362	–	–	0.05%	280
2024 Q1	$1.12M	Hold	45,362	–	–	0.06%	280
2023 Q4	$1.65M	Sell	45,362 -9,000	-17%	-$346K	0.1%	211
2023 Q3	$2.62M	Hold	54,362	–	–	0.17%	132
2023 Q2	$3.71M	Hold	54,362	–	–	0.23%	103
2023 Q1	$2.63M	Hold	54,362	–	–	0.19%	124
2022 Q4	$3.27M	Hold	54,362	–	–	0.25%	105
2022 Q3	$3.3M	Buy	54,362 +9,000	+20%	+$285K	0.28%	86
2022 Q2	$1.66M	Hold	45,362	–	–	0.12%	181
2022 Q1	$1.66M	Hold	45,362	–	–	0.11%	208
2021 Q4	$2.24M	Hold	45,362	–	–	0.14%	160
2021 Q3	$3.23M	Hold	45,362	–	–	0.18%	114
2021 Q2	$2.33M	Hold	45,362	–	–	0.13%	154
2021 Q1	$1.14M	Hold	45,362	–	–	0.07%	228
2020 Q4	$545K	Hold	45,362	–	–	0.04%	268
2020 Q3	$453K	Hold	45,362	–	–	0.05%	252
2020 Q2	$474K	Hold	45,362	–	–	0.05%	246
2020 Q1	$485K	Hold	45,362	–	–	0.06%	222
2019 Q4	$718K	Buy	+45,362	New	+$486K	0.07%	221

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

RBF Capital's PRTA Position: Q2 2026 in Review

RBF Capital held its Prothena Corp (PRTA) position steady in Q2 2026 at 29,200 shares worth $286K. The position accounts for 0.01% of the portfolio, ranked #451.

RBF Capital first reported a position in PRTA in Q4 2019 and has held it in 27 quarters since. The position peaked at $3.71M in Q2 2023. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

RBF Capital held 29,200 shares of Prothena Corp worth $286K as of Q2 2026.
RBF Capital left its Prothena Corp share count unchanged in Q2 2026.
Prothena Corp made up 0.01% of RBF Capital's portfolio in Q2 2026, its #451 holding.
RBF Capital first reported a position in Prothena Corp in Q4 2019 and has held it in 27 quarters since.
RBF Capital's Prothena Corp position peaked at $3.71M in Q2 2023.
188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

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