Wellington Management Group
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Wellington Management Group’s Prothena Corp PRTA Stock Holding History

Wellington Management 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
2025
Q3 		– Sell
-107,839
Closed -$655K – 2082
2025
Q2 		$655K Sell
107,839
-5,091,689
-98% -$38.2M ﹤0.01% 1778
2025
Q1 		$64.3M Buy
5,199,528
+68,652
+1% +$971K 0.01% 609
2024
Q4 		$71.1M Buy
5,130,876
+952,088
+23% +$15M 0.01% 614
2024
Q3 		$69.9M Buy
4,178,788
+539,359
+15% +$11.6M 0.01% 624
2024
Q2 		$75.1M Sell
3,639,429
-112,718
-3% -$2.44M 0.01% 609
2024
Q1 		$92.9M Buy
3,752,147
+1,158,045
+45% +$34.5M 0.02% 574
2023
Q4 		$94.3M Buy
2,594,102
+452,455
+21% +$17.4M 0.02% 577
2023
Q3 		$103M Sell
2,141,647
-69,575
-3% -$4.13M 0.02% 518
2023
Q2 		$151M Sell
2,211,222
-54,856
-2% -$3.54M 0.03% 449
2023
Q1 		$110M Buy
2,266,078
+501,185
+28% +$26.5M 0.02% 517
2022
Q4 		$106M Buy
1,764,893
+1,333,384
+309% +$78.1M 0.02% 508
2022
Q3 		$26.2M Buy
431,509
+338,055
+362% +$10.7M 0.01% 839
2022
Q2 		$2.54M Sell
93,454
-32
-0% -$936 ﹤0.01% 1491
2022
Q1 		$3.42M Buy
93,486
+147
+0.2% +$5.3K ﹤0.01% 1485
2021
Q4 		$4.61M Buy
+93,339
New +$5.18M ﹤0.01% 1483
2021
Q3 		– Sell
-23,821
Closed -$1.22M – 2245
2021
Q2 		$1.22M Buy
23,821
+3,232
+16% +$101K ﹤0.01% 1761
2021
Q1 		$517K Sell
20,589
-204,144
-91% -$3.84M ﹤0.01% 1846
2020
Q4 		$2.7M Sell
224,733
-381,533
-63% -$4.51M ﹤0.01% 1426
2020
Q3 		$6.06M Sell
606,266
-299,319
-33% -$3.6M ﹤0.01% 1226
2020
Q2 		$9.47M Sell
905,585
-25,211
-3% -$280K ﹤0.01% 1082
2020
Q1 		$9.96M Sell
930,796
-43,104
-4% -$522K ﹤0.01% 1034
2019
Q4 		$15.4M Sell
973,900
-74,672
-7% -$801K ﹤0.01% 1053
2019
Q3 		$8.22M Sell
1,048,572
-78,217
-7% -$695K ﹤0.01% 1223
2019
Q2 		$11.9M Sell
1,126,789
-70,039
-6% -$719K ﹤0.01% 1156
2019
Q1 		$14.5M Sell
1,196,828
-941,959
-44% -$11.8M ﹤0.01% 1096
2018
Q4 		$22M Sell
2,138,787
-1,219,474
-36% -$14.5M 0.01% 968
2018
Q3 		$43.9M Sell
3,358,261
-30,755
-0.9% -$444K 0.01% 842
2018
Q2 		$49.4M Buy
3,389,016
+64,902
+2% +$1.28M 0.01% 797
2018
Q1 		$122M Buy
3,324,114
+102,720
+3% +$3.74M 0.03% 514
2017
Q4 		$121M Sell
3,221,394
-149,020
-4% -$7.59M 0.03% 501
2017
Q3 		$218M Buy
3,370,414
+97,552
+3% +$5.98M 0.05% 339
2017
Q2 		$177M Buy
3,272,862
+114,850
+4% +$6.12M 0.04% 359
2017
Q1 		$176M Buy
3,158,012
+138,979
+5% +$7.3M 0.04% 363
2016
Q4 		$149M Buy
3,019,033
+6,117
+0.2% +$338K 0.04% 389
2016
Q3 		$181M Sell
3,012,916
-163,182
-5% -$8.75M 0.05% 342
2016
Q2 		$111M Sell
3,176,098
-40,587
-1% -$1.77M 0.03% 449
2016
Q1 		$132M Buy
3,216,685
+722,889
+29% +$28.3M 0.03% 392
2015
Q4 		$170M Sell
2,493,796
-19,773
-0.8% -$1.19M 0.04% 346
2015
Q3 		$114M Sell
2,513,569
-13,474
-0.5% -$785K 0.03% 415
2015
Q2 		$133M Buy
2,527,043
+26,331
+1% +$1.04M 0.03% 410
2015
Q1 		$95.4M Sell
2,500,712
-8,330
-0.3% -$214K 0.02% 527
2014
Q4 		$52.1M Buy
2,509,042
+121,749
+5% +$2.54M 0.01% 728
2014
Q3 		$52.9M Buy
2,387,293
+23,097
+1% +$490K 0.01% 701
2014
Q2 		$53.3M Buy
2,364,196
+737,613
+45% +$18.4M 0.01% 723
2014
Q1 		$62.3M Buy
1,626,583
+206,940
+15% +$6.67M 0.02% 669
2013
Q4 		$37.6M Buy
1,419,643
+305,861
+27% +$7.67M 0.01% 816
2013
Q3 		$22.5M Sell
1,113,782
-629,712
-36% -$11.1M 0.01% 950
2013
Q2 		$22.5M Buy
+1,743,494
New +$16.2M 0.01% 937

Other funds holding PRTA

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
AC
Armistice Capital New York $5.62B AUM 36.06% 1-Year Est. Return
RCMNY
Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return
ACM
ADAR1 Capital Management Austin, Texas $1.7B AUM 340.85% 1-Year Est. Return
PAI
Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Wellington Management Group's PRTA Position: Q3 2025 in Review

Wellington Management Group sold out of Prothena Corp (PRTA) in Q3 2025, closing a stake of 107,839 shares — an estimated $655K sold.

Wellington Management Group first reported a position in PRTA in Q2 2013 and held it in 48 quarters. The position peaked at $218M in Q3 2017. 187 funds tracked by Wall St. Rank hold PRTA as of Q3 2025.

  • Wellington Management Group reported no remaining Prothena Corp position as of Q3 2025 after selling out during the quarter.
  • Wellington Management Group sold 107,839 Prothena Corp shares in Q3 2025, an estimated $655K.
  • Wellington Management Group first reported a position in Prothena Corp in Q2 2013 and held it in 48 quarters.
  • Wellington Management Group's Prothena Corp position peaked at $218M in Q3 2017.
  • 187 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2025.

Based on Wellington Management Group's 13F filing for Q3 2025, filed 14 Nov 2025.