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Cliff Asness’s Prothena Corp PRTA Stock Holding History

Cliff Asness’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 		$2.96M Buy
302,572
+98,556
+48% +$973K ﹤0.01% 2360
2026
Q1 		$1.98M Buy
204,016
+17,231
+9% +$158K ﹤0.01% 2346
2025
Q4 		$1.78M Sell
186,785
-27,757
-13% -$283K ﹤0.01% 2192
2025
Q3 		$2.09M Buy
+214,542
New +$1.65M ﹤0.01% 1955
2024
Q1 		– Sell
-13,781
Closed -$501K – 2485
2023
Q4 		$501K Sell
13,781
-4,728
-26% -$182K ﹤0.01% 1880
2023
Q3 		$893K Sell
18,509
-777
-4% -$46.2K ﹤0.01% 1639
2023
Q2 		$1.32M Buy
19,286
+11,995
+165% +$774K ﹤0.01% 1451
2023
Q1 		$353K Buy
+7,291
New +$385K ﹤0.01% 1892
2022
Q2 		– Sell
-8,363
Closed -$306K – 2274
2022
Q1 		$306K Sell
8,363
-1,554
-16% -$56K ﹤0.01% 1960
2021
Q4 		$490K Sell
9,917
-3,429
-26% -$190K ﹤0.01% 1837
2021
Q3 		$951K Buy
13,346
+8,429
+171% +$524K ﹤0.01% 1567
2021
Q2 		$253K Buy
+4,917
New +$153K ﹤0.01% 2088
2018
Q3 		– Sell
-16,630
Closed -$242K – 2319
2018
Q2 		$242K Sell
16,630
-21,820
-57% -$431K ﹤0.01% 2179
2018
Q1 		$1.41M Hold
38,450
– – ﹤0.01% 1520
2017
Q4 		$1.44M Sell
38,450
-2,439
-6% -$124K ﹤0.01% 1523
2017
Q3 		$2.65M Sell
40,889
-868
-2% -$53.2K ﹤0.01% 1281
2017
Q2 		$2.26M Buy
41,757
+5,456
+15% +$291K ﹤0.01% 1336
2017
Q1 		$2.02M Sell
36,301
-106
-0.3% -$5.57K ﹤0.01% 1379
2016
Q4 		$1.79M Sell
36,407
-611
-2% -$33.7K ﹤0.01% 1463
2016
Q3 		$2.22M Buy
37,018
+19,741
+114% +$1.06M ﹤0.01% 1363
2016
Q2 		$604K Sell
17,277
-2,675
-13% -$117K ﹤0.01% 1808
2016
Q1 		$821K Sell
19,952
-3,550
-15% -$139K ﹤0.01% 1653
2015
Q4 		$1.6M Buy
23,502
+16,490
+235% +$995K ﹤0.01% 1359
2015
Q3 		$318K Buy
+7,012
New +$408K ﹤0.01% 1901

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

Cliff Asness's PRTA Position: Q2 2026 in Review

Cliff Asness increased its Prothena Corp (PRTA) stake by 48% in Q2 2026, buying an estimated $973K and bringing the position to 302,572 shares worth $2.96M. The position accounts for ﹤0.01% of the portfolio, ranked #2360.

Cliff Asness first reported a position in PRTA in Q3 2015 and has held it in 24 quarters since. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Cliff Asness held 302,572 shares of Prothena Corp worth $2.96M as of Q2 2026.
  • Cliff Asness bought 98,556 Prothena Corp shares in Q2 2026, an estimated $973K.
  • Prothena Corp made up ﹤0.01% of Cliff Asness's portfolio in Q2 2026, its #2360 holding.
  • Cliff Asness first reported a position in Prothena Corp in Q3 2015 and has held it in 24 quarters since.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on AQR Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.