Massachusetts Financial Services
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Massachusetts Financial Services’s Prothena Corp PRTA Stock Holding History

Massachusetts Financial Services’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
Q1 		$1.28M Buy
132,051
+86,081
+187% +$789K ﹤0.01% 830
2025
Q4 		$439K Sell
45,970
-1,519
-3% -$15.5K ﹤0.01% 879
2025
Q3 		$463K Buy
47,489
+3,125
+7% +$24K ﹤0.01% 833
2025
Q2 		$269K Buy
44,364
+548
+1% +$4.11K ﹤0.01% 864
2025
Q1 		$542K Sell
43,816
-999
-2% -$14.1K ﹤0.01% 845
2024
Q4 		$621K Buy
+44,815
New +$707K ﹤0.01% 837
2022
Q2 		– Sell
-13,556
Closed -$496K – 877
2022
Q1 		$496K Sell
13,556
-28,302
-68% -$1.02M ﹤0.01% 823
2021
Q4 		$2.07M Sell
41,858
-848
-2% -$47K ﹤0.01% 777
2021
Q3 		$3.04M Sell
42,706
-562
-1% -$34.9K ﹤0.01% 741
2021
Q2 		$2.22M Sell
43,268
-30,071
-41% -$938K ﹤0.01% 768
2021
Q1 		$1.84M Sell
73,339
-35,255
-32% -$663K ﹤0.01% 778
2020
Q4 		$1.3M Buy
108,594
+21,373
+25% +$253K ﹤0.01% 778
2020
Q3 		$871K Buy
+87,221
New +$1.05M ﹤0.01% 786

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $8.16B AUM 68.42% 1-Year Est. Return
BlackRock
BlackRock New York $5.7T AUM 30.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $127B AUM 43.98% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $1.66B AUM 340.85% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Morgan Stanley
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