Canada Pension Plan Investment Board’s Prothena Corp PRTA Stock Holding History

Canada Pension Plan Investment Board’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	$235K	Buy	+24,000	New	+$237K	﹤0.01%	1552
2026 Q1	–	Sell	-7,100	Closed	-$67.8K	–	1944
2025 Q4	$67.8K	Buy	+7,100	New	+$72.3K	﹤0.01%	1870
2023 Q2	–	Sell	-26,800	Closed	-$1.3M	–	1081
2023 Q1	$1.3M	Buy	+26,800	New	+$1.42M	﹤0.01%	849
2020 Q1	–	Sell	-75,600	Closed	-$1.2M	–	1437
2019 Q4	$1.2M	Buy	+75,600	New	+$811K	﹤0.01%	984
2013 Q4	–	Sell	-16,048	Closed	-$325K	–	1262
2013 Q3	$325K	Hold	16,048	–	–	﹤0.01%	800
2013 Q2	$207K	Buy	+16,048	New	+$149K	﹤0.01%	725

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

Canada Pension Plan Investment Board's PRTA Position: Q2 2026 in Review

Canada Pension Plan Investment Board opened a new position in Prothena Corp (PRTA) in Q2 2026: 24,000 shares worth $235K. The stake represents ﹤0.01% of the portfolio and ranks #1552 among its holdings. This is a return to the name: Canada Pension Plan Investment Board previously reported a position in PRTA as recently as Q4 2025.

Canada Pension Plan Investment Board first reported a position in PRTA in Q2 2013 and has held it in 6 quarters since. The position peaked at $1.3M in Q1 2023. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Canada Pension Plan Investment Board held 24,000 shares of Prothena Corp worth $235K as of Q2 2026.
Prothena Corp was a new Canada Pension Plan Investment Board position in Q2 2026.
Prothena Corp made up ﹤0.01% of Canada Pension Plan Investment Board's portfolio in Q2 2026, its #1552 holding.
Canada Pension Plan Investment Board first reported a position in Prothena Corp in Q2 2013 and has held it in 6 quarters since.
Canada Pension Plan Investment Board's Prothena Corp position peaked at $1.3M in Q1 2023.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Canada Pension Plan Investment Board's 13F filing for Q2 2026, filed 14 Aug 2026.