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PDT Partners’s Prothena Corp PRTA Stock Holding History

PDT 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
2026
Q1 		– Sell
-11,334
Closed -$108K – 589
2025
Q4 		$108K Buy
+11,334
New +$115K 0.01% 541
2025
Q3 		– Sell
-41,281
Closed -$251K – 700
2025
Q2 		$251K Sell
41,281
-109,035
-73% -$818K 0.01% 621
2025
Q1 		$1.86M Buy
150,316
+23,113
+18% +$327K 0.13% 266
2024
Q4 		$1.76M Buy
127,203
+16,549
+15% +$261K 0.16% 235
2024
Q3 		$1.85M Buy
110,654
+7,946
+8% +$171K 0.16% 225
2024
Q2 		$2.12M Buy
+102,708
New +$2.22M 0.2% 189
2021
Q4 		– Sell
-4,420
Closed -$315K – 990
2021
Q3 		$315K Buy
+4,420
New +$275K 0.02% 585
2020
Q3 		– Sell
-39,000
Closed -$408K – 835
2020
Q2 		$408K Buy
39,000
+17,500
+81% +$194K 0.03% 461
2020
Q1 		$230K Hold
21,500
– – 0.02% 530
2019
Q4 		$340K Sell
21,500
-15,888
-42% -$170K 0.02% 507
2019
Q3 		$293K Sell
37,388
-18,415
-33% -$164K 0.02% 377
2019
Q2 		$590K Sell
55,803
-3,100
-5% -$31.8K 0.03% 294
2019
Q1 		$714K Buy
+58,903
New +$735K 0.04% 284
2014
Q3 		– Sell
-57,331
Closed -$1.29M – 1532
2014
Q2 		$1.29M Buy
+57,331
New +$1.43M 0.03% 603

Other funds holding PRTA

Fidelity Investments
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
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
D.E. Shaw & Co
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
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

PDT Partners's PRTA Position: Q1 2026 in Review

PDT Partners sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 11,334 shares — an estimated $108K sold.

PDT Partners first reported a position in PRTA in Q2 2014 and held it in 14 quarters. The position peaked at $2.12M in Q2 2024. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • PDT Partners reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
  • PDT Partners sold 11,334 Prothena Corp shares in Q1 2026, an estimated $108K.
  • PDT Partners first reported a position in Prothena Corp in Q2 2014 and held it in 14 quarters.
  • PDT Partners's Prothena Corp position peaked at $2.12M in Q2 2024.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

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