Man Group
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Man Group’s Prothena Corp PRTA Stock Holding History

Man Group’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 		$6.64M Buy
678,116
+296,542
+78% +$2.93M 0.01% 988
2026
Q1 		$3.71M Buy
381,574
+112,061
+42% +$1.03M 0.01% 1304
2025
Q4 		$2.57M Buy
269,513
+137,540
+104% +$1.4M ﹤0.01% 1358
2025
Q3 		$1.29M Buy
131,973
+89,221
+209% +$686K ﹤0.01% 1578
2025
Q2 		$260K Buy
42,752
+25,752
+151% +$193K ﹤0.01% 1992
2025
Q1 		$210K Sell
17,000
-60,430
-78% -$854K ﹤0.01% 2023
2024
Q4 		$1.07M Buy
77,430
+36,824
+91% +$581K ﹤0.01% 1474
2024
Q3 		$679K Buy
40,606
+77
+0.2% +$1.66K ﹤0.01% 1592
2024
Q2 		$837K Buy
40,529
+10,850
+37% +$235K ﹤0.01% 1555
2024
Q1 		$735K Sell
29,679
-2,725
-8% -$81.1K ﹤0.01% 1649
2023
Q4 		$1.18M Buy
+32,404
New +$1.25M ﹤0.01% 1402
2023
Q3 		– Sell
-170,562
Closed -$10.1M – 1721
2023
Q2 		$11.6M Buy
+170,562
New +$11M 0.04% 572
2023
Q1 		– Sell
-23,697
Closed -$1.25M – 763
2022
Q4 		$1.43M Sell
23,697
-27,019
-53% -$1.58M 0.01% 1219
2022
Q3 		$3.08M Buy
+50,716
New +$1.6M 0.01% 920
2022
Q2 		– Hold
0
– – – 1283
2021
Q1 		– Sell
-69,023
Closed -$829K – 1972
2020
Q4 		$829K Sell
69,023
-700
-1% -$8.28K ﹤0.01% 1457
2020
Q3 		$697K Buy
69,723
+2,400
+4% +$28.9K ﹤0.01% 1467
2020
Q2 		$704K Sell
67,323
-2,800
-4% -$31.1K ﹤0.01% 1374
2020
Q1 		$750K Sell
70,123
-6,444
-8% -$78K ﹤0.01% 1185
2019
Q4 		$1.21M Sell
76,567
-19,456
-20% -$209K ﹤0.01% 1464
2019
Q3 		$753K Sell
96,023
-64,043
-40% -$569K ﹤0.01% 1500
2019
Q2 		$1.69M Buy
160,066
+32,192
+25% +$331K 0.01% 1358
2019
Q1 		$1.55M Buy
127,874
+1,800
+1% +$22.5K 0.01% 1436
2018
Q4 		$1.3M Sell
126,074
-30,632
-20% -$364K 0.01% 1374
2018
Q3 		$2.05M Sell
156,706
-61,700
-28% -$891K 0.01% 1411
2018
Q2 		$3.18M Buy
+218,406
New +$4.31M 0.01% 1163

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

Man Group's PRTA Position: Q2 2026 in Review

Man Group increased its Prothena Corp (PRTA) stake by 78% in Q2 2026, buying an estimated $2.93M and bringing the position to 678,116 shares worth $6.64M. The position accounts for 0.01% of the portfolio, ranked #988.

Man Group first reported a position in PRTA in Q2 2018 and has held it in 25 quarters since. The position peaked at $11.6M in Q2 2023. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

  • Man Group held 678,116 shares of Prothena Corp worth $6.64M as of Q2 2026.
  • Man Group bought 296,542 Prothena Corp shares in Q2 2026, an estimated $2.93M.
  • Prothena Corp made up 0.01% of Man Group's portfolio in Q2 2026, its #988 holding.
  • Man Group first reported a position in Prothena Corp in Q2 2018 and has held it in 25 quarters since.
  • Man Group's Prothena Corp position peaked at $11.6M in Q2 2023.
  • 188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Man Group's 13F filing for Q2 2026, filed 14 Aug 2026.