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Quantbot Technologies’s Prothena Corp PRTA Stock Holding History

Quantbot Technologies’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
Q2 		$15.8K Buy
+1,611
New +$15.9K ﹤0.01% 1802
2024
Q2 		– Sell
-1,300
Closed -$32.2K – 1817
2024
Q1 		$32.2K Buy
+1,300
New +$38.7K ﹤0.01% 1376
2022
Q1 		– Sell
-5,338
Closed -$263K – 1975
2021
Q4 		$263K Buy
5,338
+4,738
+790% +$263K 0.02% 666
2021
Q3 		$42K Buy
+600
New +$37.3K ﹤0.01% 1140
2021
Q2 		– Sell
-2,451
Closed -$61K – 1778
2021
Q1 		$61K Buy
2,451
+351
+17% +$6.6K 0.01% 973
2020
Q4 		$25K Buy
+2,100
New +$24.8K ﹤0.01% 981
2019
Q3 		– Sell
-5,400
Closed -$57K – 1505
2019
Q2 		$57K Buy
+5,400
New +$55.5K 0.01% 874
2018
Q4 		– Sell
-8,595
Closed -$112K – 1329
2018
Q3 		$112K Buy
8,595
+797
+10% +$11.5K 0.01% 855
2018
Q2 		$113K Buy
7,798
+4,795
+160% +$94.7K 0.01% 857
2018
Q1 		$110K Sell
3,003
-1,791
-37% -$65.1K 0.01% 822
2017
Q4 		$179K Buy
4,794
+4,687
+4,380% +$239K 0.02% 724
2017
Q3 		$6K Sell
107
-1,763
-94% -$108K ﹤0.01% 1112
2017
Q2 		$101K Buy
1,870
+1,628
+673% +$86.7K 0.01% 801
2017
Q1 		$13K Buy
+242
New +$12.7K ﹤0.01% 1038
2016
Q4 		– Sell
-412
Closed -$24K – 1294
2016
Q3 		$24K Sell
412
-140
-25% -$7.51K ﹤0.01% 933
2016
Q2 		$19K Buy
+552
New +$24K ﹤0.01% 928
2015
Q2 		– Sell
-1,971
Closed -$75K – 1318
2015
Q1 		$75K Buy
+1,971
New +$50.6K 0.02% 684
2014
Q2 		– Sell
-1,200
Closed -$45K – 1342
2014
Q1 		$45K Buy
+1,200
New +$38.7K 0.01% 811

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
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
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
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

Quantbot Technologies's PRTA Position: Q2 2026 in Review

Quantbot Technologies opened a new position in Prothena Corp (PRTA) in Q2 2026: 1,611 shares worth $15.8K. The stake represents ﹤0.01% of the portfolio and ranks #1802 among its holdings. This is a return to the name: Quantbot Technologies previously reported a position in PRTA as recently as Q1 2024.

Quantbot Technologies first reported a position in PRTA in Q1 2014 and has held it in 18 quarters since. The position peaked at $263K in Q4 2021. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Quantbot Technologies held 1,611 shares of Prothena Corp worth $15.8K as of Q2 2026.
  • Prothena Corp was a new Quantbot Technologies position in Q2 2026.
  • Prothena Corp made up ﹤0.01% of Quantbot Technologies's portfolio in Q2 2026, its #1802 holding.
  • Quantbot Technologies first reported a position in Prothena Corp in Q1 2014 and has held it in 18 quarters since.
  • Quantbot Technologies's Prothena Corp position peaked at $263K in Q4 2021.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Quantbot Technologies's 13F filing for Q2 2026, filed 12 Aug 2026.