Martingale Asset Management’s Prothena Corp PRTA Stock Holding History

Martingale Asset 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	$771K	Buy	78,800 +9,699	+14%	+$95.8K	0.02%	581
2026 Q1	$672K	Buy	69,101 +5,648	+9%	+$51.8K	0.02%	585
2025 Q4	$606K	Buy	+63,453	New	+$646K	0.02%	571
2023 Q4	–	Sell	-12,415	Closed	-$599K	–	837
2023 Q3	$599K	Buy	12,415 +1,097	+10%	+$65.2K	0.01%	567
2023 Q2	$773K	Buy	+11,318	New	+$730K	0.02%	520
2020 Q4	–	Sell	-44,635	Closed	-$446K	–	1015
2020 Q3	$446K	Sell	44,635 -60,700	-58%	-$730K	0.01%	841
2020 Q2	$1.1M	Buy	+105,335	New	+$1.17M	0.01%	711
2015 Q2	–	Sell	-7,301	Closed	-$279K	–	895
2015 Q1	$279K	Buy	+7,301	New	+$187K	0.01%	791

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

Martingale Asset Management's PRTA Position: Q2 2026 in Review

Martingale Asset Management increased its Prothena Corp (PRTA) stake by 14% in Q2 2026, buying an estimated $95.8K and bringing the position to 78,800 shares worth $771K. The position accounts for 0.02% of the portfolio, ranked #581.

Martingale Asset Management first reported a position in PRTA in Q1 2015 and has held it in 8 quarters since. The position peaked at $1.1M in Q2 2020. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Martingale Asset Management held 78,800 shares of Prothena Corp worth $771K as of Q2 2026.
Martingale Asset Management bought 9,699 Prothena Corp shares in Q2 2026, an estimated $95.8K.
Prothena Corp made up 0.02% of Martingale Asset Management's portfolio in Q2 2026, its #581 holding.
Martingale Asset Management first reported a position in Prothena Corp in Q1 2015 and has held it in 8 quarters since.
Martingale Asset Management's Prothena Corp position peaked at $1.1M in Q2 2020.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Martingale Asset Management's 13F filing for Q2 2026, filed 13 Aug 2026.