Citigroup’s Prothena Corp PRTA Stock Holding History

Citigroup’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
2023 Q3	–	Sell	-25,000	Closed	-$1.71M	–	5764
2023 Q2	$1.71M	Buy	+25,000	New	+$1.61M	﹤0.01%	2360
2019 Q1	–	Sell	-37,400	Closed	-$385K	–	7759
2018 Q4	$385K	Sell	37,400 -7,700	-17%	-$91.5K	﹤0.01%	4403
2018 Q3	$590K	Buy	45,100 +13,700	+44%	+$198K	﹤0.01%	4087
2018 Q2	$458K	Buy	31,400 +23,900	+319%	+$472K	﹤0.01%	4220
2018 Q1	$275K	Buy	7,500 +4,300	+134%	+$156K	﹤0.01%	4612
2017 Q4	$120K	Sell	3,200 -11,800	-79%	-$601K	﹤0.01%	5483
2017 Q3	$972K	Buy	15,000 +10,700	+249%	+$655K	﹤0.01%	3414
2017 Q2	$233K	Sell	4,300 -14,800	-77%	-$789K	﹤0.01%	4664
2017 Q1	$1.07M	Buy	19,100 +13,000	+213%	+$683K	﹤0.01%	3149
2016 Q4	$300K	Buy	6,100 +3,000	+97%	+$166K	﹤0.01%	4931
2016 Q3	$186K	Buy	+3,100	New	+$166K	﹤0.01%	4714

Other funds holding PRTA

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 New York $6.73T AUM 46.02% 1-Year Est. Return

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

Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

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 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

Citigroup's PRTA Position: Q2 2026 in Review

Citigroup increased its Prothena Corp (PRTA) stake by 610% in Q2 2026, buying an estimated $490K and bringing the position to 57,827 shares worth $566K. The position accounts for ﹤0.01% of the portfolio, ranked #3831.

Citigroup first reported a position in PRTA in Q2 2013 and has held it in 53 quarters since. The position peaked at $6.44M in Q1 2024. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Citigroup held 57,827 shares of Prothena Corp worth $566K as of Q2 2026.
Citigroup bought 49,677 Prothena Corp shares in Q2 2026, an estimated $490K.
Prothena Corp made up ﹤0.01% of Citigroup's portfolio in Q2 2026, its #3831 holding.
Citigroup first reported a position in Prothena Corp in Q2 2013 and has held it in 53 quarters since.
Citigroup's Prothena Corp position peaked at $6.44M in Q1 2024.
188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Citigroup's 13F filing for Q2 2026, filed 3 Aug 2026.