Los Angeles Capital Management’s Prothena Corp PRTA Stock Holding History

Los Angeles 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	$3.3K	Sell	337 -24,082	-99%	-$238K	﹤0.01%	2206
2026 Q1	$237K	Sell	24,419 -70,987	-74%	-$651K	﹤0.01%	1094
2025 Q4	$1,000K	Sell	95,406 -24,018	-20%	-$245K	﹤0.01%	620
2025 Q3	$1.17M	Buy	119,424 +102,722	+615%	+$790K	﹤0.01%	662
2025 Q2	$101K	Buy	+16,702	New	+$125K	﹤0.01%	1252
2023 Q1	–	Sell	-5,576	Closed	-$336K	–	1273
2022 Q4	$336K	Sell	5,576 -530	-9%	-$31K	﹤0.01%	1005
2022 Q3	$370K	Buy	+6,106	New	+$193K	﹤0.01%	1013
2021 Q4	–	Sell	-17,645	Closed	-$1.26M	–	1464
2021 Q3	$1.26M	Sell	17,645 -16,850	-49%	-$1.05M	0.01%	665
2021 Q2	$1.77M	Sell	34,495 -4,680	-12%	-$146K	0.01%	620
2021 Q1	$984K	Sell	39,175 -400	-1%	-$7.53K	﹤0.01%	900
2020 Q4	$475K	Sell	39,575 -2,070	-5%	-$24.5K	﹤0.01%	1231
2020 Q3	$416K	Buy	41,645 +860	+2%	+$10.3K	﹤0.01%	1156
2020 Q2	$427K	Buy	40,785 +21,085	+107%	+$234K	﹤0.01%	1171
2020 Q1	$211K	Buy	+19,700	New	+$239K	﹤0.01%	1160
2015 Q1	–	Sell	-10,620	Closed	-$220K	–	1239
2014 Q4	$220K	Buy	+10,620	New	+$222K	﹤0.01%	1043

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

Los Angeles Capital Management's PRTA Position: Q2 2026 in Review

Los Angeles Capital Management reduced its Prothena Corp (PRTA) stake by 99% in Q2 2026, selling an estimated $238K and leaving 337 shares worth $3.3K. The position accounts for ﹤0.01% of the portfolio, ranked #2206.

Los Angeles Capital Management first reported a position in PRTA in Q4 2014 and has held it in 15 quarters since. The position peaked at $1.77M in Q2 2021. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Los Angeles Capital Management held 337 shares of Prothena Corp worth $3.3K as of Q2 2026.
Los Angeles Capital Management sold 24,082 Prothena Corp shares in Q2 2026, an estimated $238K.
Prothena Corp made up ﹤0.01% of Los Angeles Capital Management's portfolio in Q2 2026, its #2206 holding.
Los Angeles Capital Management first reported a position in Prothena Corp in Q4 2014 and has held it in 15 quarters since.
Los Angeles Capital Management's Prothena Corp position peaked at $1.77M in Q2 2021.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

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