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
Q3 		$1.02M Sell
121,493
-5,497
-4% -$49.1K ﹤0.01% 870
2026
Q2 		$1.24M Sell
126,990
-5,061
-4% -$50K ﹤0.01% 876
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 $2.32T AUM 44.66% 1-Year Est. Return
BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $85.7B AUM 51.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM
Federated Hermes
Federated Hermes Pittsburgh, Pennsylvania $71.4B AUM 33.43% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $73.4B AUM 32.8% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.96T AUM 27.49% 1-Year Est. Return

Massachusetts Financial Services's PRTA Position: Q3 2026 in Review

Massachusetts Financial Services reduced its Prothena Corp (PRTA) stake by 4.3% in Q3 2026, selling an estimated $49.1K and leaving 121,493 shares worth $1.02M. The position accounts for ﹤0.01% of the portfolio, ranked #870.

Massachusetts Financial Services first reported a position in PRTA in Q3 2020 and has held it in 15 quarters since. The position peaked at $3.04M in Q3 2021. 130 funds tracked by Wall St. Rank hold PRTA as of Q3 2026.

  • Massachusetts Financial Services held 121,493 shares of Prothena Corp worth $1.02M as of Q3 2026.
  • Massachusetts Financial Services sold 5,497 Prothena Corp shares in Q3 2026, an estimated $49.1K.
  • Prothena Corp made up ﹤0.01% of Massachusetts Financial Services's portfolio in Q3 2026, its #870 holding.
  • Massachusetts Financial Services first reported a position in Prothena Corp in Q3 2020 and has held it in 15 quarters since.
  • Massachusetts Financial Services's Prothena Corp position peaked at $3.04M in Q3 2021.
  • 130 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2026.

Based on Massachusetts Financial Services's 13F filing for Q3 2026, filed 12 Nov 2026.