Diadema Partners’s Prothena Corp PRTA Stock Holding History

Diadema Partners’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
2025 Q3	–	Sell	-100,000	Closed	-$607K	–	156
2025 Q2	$607K	Buy	+100,000	New	+$751K	0.18%	77

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

Diadema Partners's PRTA Position: Q1 2026 in Review

Diadema Partners sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 106,539 shares — an estimated $1.02M sold.

Diadema Partners first reported a position in PRTA in Q4 2025 and held it in 1 quarter. The position peaked at $1.02M in Q4 2025. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

Diadema Partners reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
Diadema Partners sold 106,539 Prothena Corp shares in Q1 2026, an estimated $1.02M.
Diadema Partners first reported a position in Prothena Corp in Q4 2025 and held it in 1 quarter.
Diadema Partners's Prothena Corp position peaked at $1.02M in Q4 2025.
185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

Based on Diadema Partners's 13F filing for Q1 2026, filed 15 May 2026.