Millennium Management’s Prothena Corp PRTA Stock Holding History

Millennium 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
2022 Q4	–	Sell	-40,000	Closed	-$2.42M	–	6936
2022 Q3	$2.42M	Buy	+40,000	New	+$1.26M	﹤0.01%	3568
2014 Q2	–	Sell	-88,900	Closed	-$2.47M	–	3769
2014 Q1	$2.47M	Buy	+88,900	New	+$2.87M	0.01%	1629

Other funds holding PRTA

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

RCMNY

Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

ACM

ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

Millennium Management's PRTA Position: Q1 2026 in Review

Millennium Management sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 21,976 shares — an estimated $201K sold.

Millennium Management first reported a position in PRTA in Q3 2013 and held it in 47 quarters. The position peaked at $32M in Q1 2018. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

Millennium Management reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
Millennium Management sold 21,976 Prothena Corp shares in Q1 2026, an estimated $201K.
Millennium Management first reported a position in Prothena Corp in Q3 2013 and held it in 47 quarters.
Millennium Management's Prothena Corp position peaked at $32M in Q1 2018.
185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

Based on Millennium Management's 13F filing for Q1 2026, filed 15 May 2026.