Connor, Clark & Lunn Investment Management (CC&L)
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Connor, Clark & Lunn Investment Management (CC&L)’s Prothena Corp PRTA Stock Holding History

Connor, Clark & Lunn Investment Management (CC&L)’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 		$1.88M Buy
191,693
+35,142
+22% +$347K ﹤0.01% 1022
2026
Q1 		$1.52M Buy
156,551
+30,661
+24% +$281K ﹤0.01% 1040
2025
Q4 		$1.2M Buy
+125,890
New +$1.28M ﹤0.01% 1079
2025
Q3 		– Sell
-18,896
Closed -$115K – 1683
2025
Q2 		$115K Sell
18,896
-72,586
-79% -$545K ﹤0.01% 1451
2025
Q1 		$1.13M Sell
91,482
-358
-0.4% -$5.06K ﹤0.01% 911
2024
Q4 		$1.27M Sell
91,840
-30,652
-25% -$484K 0.01% 853
2024
Q3 		$2.05M Buy
122,492
+9,666
+9% +$208K 0.01% 662
2024
Q2 		$2.33M Sell
112,826
-19,079
-14% -$413K 0.01% 610
2024
Q1 		$3.27M Sell
131,905
-24,037
-15% -$715K 0.01% 532
2023
Q4 		$5.67M Buy
155,942
+28,167
+22% +$1.08M 0.03% 387
2023
Q3 		$6.17M Buy
127,775
+17,639
+16% +$1.05M 0.03% 345
2023
Q2 		$7.52M Buy
110,136
+20,712
+23% +$1.34M 0.04% 317
2023
Q1 		$4.33M Buy
89,424
+28,992
+48% +$1.53M 0.02% 397
2022
Q4 		$3.64M Buy
60,432
+32,876
+119% +$1.93M 0.02% 418
2022
Q3 		$1.67M Buy
27,556
+11,526
+72% +$364K 0.01% 532
2022
Q2 		$435K Buy
+16,030
New +$469K ﹤0.01% 812
2021
Q4 		– Sell
-6,690
Closed -$477K – 1177
2021
Q3 		$477K Buy
+6,690
New +$415K ﹤0.01% 781
2020
Q2 		– Sell
-26,225
Closed -$281K – 1152
2020
Q1 		$281K Buy
26,225
+6,100
+30% +$73.9K ﹤0.01% 811
2019
Q4 		$319K Sell
20,125
-3,800
-16% -$40.7K ﹤0.01% 752
2019
Q3 		$188K Buy
23,925
+4,575
+24% +$40.6K ﹤0.01% 870
2019
Q2 		$205K Buy
+19,350
New +$199K ﹤0.01% 898
2015
Q4 		– Sell
-4,500
Closed -$204K – 858
2015
Q3 		$204K Sell
4,500
-21,000
-82% -$1.22M ﹤0.01% 643
2015
Q2 		$1.34M Sell
25,500
-12,600
-33% -$497K 0.01% 294
2015
Q1 		$1.45M Buy
38,100
+10,000
+36% +$257K 0.01% 264
2014
Q4 		$583K Buy
28,100
+19,000
+209% +$396K ﹤0.01% 372
2014
Q3 		$202K Buy
+9,100
New +$193K ﹤0.01% 496

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

Connor, Clark & Lunn Investment Management (CC&L)'s PRTA Position: Q2 2026 in Review

Connor, Clark & Lunn Investment Management (CC&L) increased its Prothena Corp (PRTA) stake by 22% in Q2 2026, buying an estimated $347K and bringing the position to 191,693 shares worth $1.88M. The position accounts for ﹤0.01% of the portfolio, ranked #1022.

Connor, Clark & Lunn Investment Management (CC&L) first reported a position in PRTA in Q3 2014 and has held it in 26 quarters since. The position peaked at $7.52M in Q2 2023. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Connor, Clark & Lunn Investment Management (CC&L) held 191,693 shares of Prothena Corp worth $1.88M as of Q2 2026.
  • Connor, Clark & Lunn Investment Management (CC&L) bought 35,142 Prothena Corp shares in Q2 2026, an estimated $347K.
  • Prothena Corp made up ﹤0.01% of Connor, Clark & Lunn Investment Management (CC&L)'s portfolio in Q2 2026, its #1022 holding.
  • Connor, Clark & Lunn Investment Management (CC&L) first reported a position in Prothena Corp in Q3 2014 and has held it in 26 quarters since.
  • Connor, Clark & Lunn Investment Management (CC&L)'s Prothena Corp position peaked at $7.52M in Q2 2023.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Connor, Clark & Lunn Investment Management (CC&L)'s 13F filing for Q2 2026, filed 13 Aug 2026.