Barclays
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Barclays’s Prothena Corp PRTA Stock Holding History

Barclays’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
2020
Q2 		– Sell
-11,900
Closed -$127K – 6109
2020
Q1 		$127K Sell
11,900
-600
-5% -$7.27K ﹤0.01% 4627
2019
Q4 		$198K Buy
12,500
+12,000
+2,400% +$129K ﹤0.01% 5033
2019
Q3 		$4K Buy
+500
New +$4.44K ﹤0.01% 6487
2019
Q2 		– Sell
-27,300
Closed -$331K – 7191
2019
Q1 		$331K Sell
27,300
-28,600
-51% -$357K ﹤0.01% 4444
2018
Q4 		$576K Buy
55,900
+6,700
+14% +$79.6K ﹤0.01% 3684
2018
Q3 		$644K Buy
49,200
+43,300
+734% +$625K ﹤0.01% 4060
2018
Q2 		$86K Sell
5,900
-31,100
-84% -$614K ﹤0.01% 5341
2018
Q1 		$1.36M Buy
37,000
+23,000
+164% +$837K ﹤0.01% 2861
2017
Q4 		$525K Buy
14,000
+13,000
+1,300% +$662K ﹤0.01% 3776
2017
Q3 		$65K Buy
+1,000
New +$61.3K ﹤0.01% 5201
2015
Q2 		– Sell
-12,500
Closed -$475K – 7160
2015
Q1 		$475K Sell
12,500
-46
-0.4% -$1.18K ﹤0.01% 3657
2014
Q4 		$251K Buy
12,546
+1,400
+13% +$29.2K ﹤0.01% 4448
2014
Q3 		$245K Buy
11,146
+1,100
+11% +$23.3K ﹤0.01% 4550
2014
Q2 		$221K Buy
10,046
+10,000
+21,739% +$250K ﹤0.01% 4722
2014
Q1 		$2K Sell
46
-44
-49% -$1.42K ﹤0.01% 7407
2013
Q4 		$2K Buy
+90
New +$2.26K ﹤0.01% 7370
2013
Q3 		– Sell
-90
Closed -$1K – 7565
2013
Q2 		$1K Buy
+90
New +$837 ﹤0.01% 7601

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 $9.44B AUM 68.42% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T 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 $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
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

Barclays's PRTA Position: Q1 2026 in Review

Barclays reduced its Prothena Corp (PRTA) stake by 78% in Q1 2026, selling an estimated $1.31M and leaving 40,862 shares worth $397K. The position accounts for ﹤0.01% of the portfolio, ranked #3316.

Barclays first reported a position in PRTA in Q2 2013 and has held it in 51 quarters since. The position peaked at $5.18M in Q4 2023. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Barclays held 40,862 shares of Prothena Corp worth $397K as of Q1 2026.
  • Barclays sold 142,763 Prothena Corp shares in Q1 2026, an estimated $1.31M.
  • Prothena Corp made up ﹤0.01% of Barclays's portfolio in Q1 2026, its #3316 holding.
  • Barclays first reported a position in Prothena Corp in Q2 2013 and has held it in 51 quarters since.
  • Barclays's Prothena Corp position peaked at $5.18M in Q4 2023.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

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