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Amalgamated Bank’s Prothena Corp PRTA Stock Holding History

Amalgamated Bank’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
Q1 		– Sell
-1,383
Closed -$13K – 2527
2025
Q4 		$13K Sell
1,383
-57
-4% -$580 ﹤0.01% 2318
2025
Q3 		$14K Hold
1,440
– – ﹤0.01% 2313
2025
Q2 		$9K Hold
1,440
– – ﹤0.01% 2496
2025
Q1 		$18K Hold
1,440
– – ﹤0.01% 2102
2024
Q4 		$20K Hold
1,440
– – ﹤0.01% 2117
2024
Q3 		$24K Hold
1,440
– – ﹤0.01% 2061
2024
Q2 		$30K Hold
1,440
– – ﹤0.01% 1988
2024
Q1 		$36K Sell
1,440
-4,610
-76% -$137K ﹤0.01% 1946
2023
Q4 		$220K Sell
6,050
-277
-4% -$10.7K ﹤0.01% 1769
2023
Q3 		$305K Buy
6,327
+138
+2% +$8.2K ﹤0.01% 1618
2023
Q2 		$423K Buy
6,189
+775
+14% +$50K ﹤0.01% 1518
2023
Q1 		$262K Sell
5,414
-712
-12% -$37.6K ﹤0.01% 1701
2022
Q4 		$369K Buy
6,126
+406
+7% +$23.8K ﹤0.01% 1604
2022
Q3 		$347K Buy
5,720
+89
+2% +$2.81K ﹤0.01% 1601
2022
Q2 		$153K Buy
5,631
+90
+2% +$2.63K ﹤0.01% 1984
2022
Q1 		$203K Sell
5,541
-370
-6% -$13.3K ﹤0.01% 1933
2021
Q4 		$292K Buy
5,911
+76
+1% +$4.21K ﹤0.01% 1838
2021
Q3 		$416K Sell
5,835
-225
-4% -$14K ﹤0.01% 1681
2021
Q2 		$312K Buy
+6,060
New +$189K ﹤0.01% 1863
2017
Q4 		– Sell
-4,872
Closed -$316K – 1660
2017
Q3 		$316K Buy
4,872
+141
+3% +$8.64K 0.01% 1180
2017
Q2 		$256K Buy
4,731
+476
+11% +$25.4K 0.01% 1283
2017
Q1 		$237K Sell
4,255
-12
-0.3% -$630 0.01% 1285
2016
Q4 		$210K Buy
4,267
+593
+16% +$32.7K 0.01% 1361
2016
Q3 		$220K Buy
3,674
+4
+0.1% +$215 0.01% 1211
2016
Q2 		$208K Buy
+3,670
New +$160K 0.01% 1239
2016
Q1 		– Sell
-3,001
Closed -$204K – 1307
2015
Q4 		$204K Buy
+3,001
New +$181K 0.03% 1063

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 $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 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

Amalgamated Bank's PRTA Position: Q1 2026 in Review

Amalgamated Bank sold out of Prothena Corp (PRTA) in Q1 2026, closing a stake of 1,383 shares — an estimated $13K sold.

Amalgamated Bank first reported a position in PRTA in Q4 2015 and held it in 26 quarters. The position peaked at $423K in Q2 2023. 185 funds tracked by Wall St. Rank hold PRTA as of Q1 2026.

  • Amalgamated Bank reported no remaining Prothena Corp position as of Q1 2026 after selling out during the quarter.
  • Amalgamated Bank sold 1,383 Prothena Corp shares in Q1 2026, an estimated $13K.
  • Amalgamated Bank first reported a position in Prothena Corp in Q4 2015 and held it in 26 quarters.
  • Amalgamated Bank's Prothena Corp position peaked at $423K in Q2 2023.
  • 185 funds tracked by Wall St. Rank held Prothena Corp as of Q1 2026.

Based on Amalgamated Bank's 13F filing for Q1 2026, filed 8 May 2026.