Avidity Partners Management’s Prothena Corp PRTA Stock Holding History

Avidity Partners Management’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 Q4	–	Sell	-382,305	Closed	-$18.4M	–	84
2023 Q3	$18.4M	Sell	382,305 -152,695	-29%	-$9.07M	0.74%	49
2023 Q2	$36.5M	Sell	535,000 -533,200	-50%	-$34.4M	1.28%	34
2023 Q1	$51.8M	Sell	1,068,200 -1,884,800	-64%	-$99.6M	1.72%	22
2022 Q4	$178M	Buy	2,953,000 +986,000	+50%	+$57.7M	3.85%	6
2022 Q3	$119M	Buy	+1,967,000	New	+$62.2M	2.42%	10
2021 Q3	–	Sell	-182,000	Closed	-$9.36M	–	126
2021 Q2	$9.36M	Buy	+182,000	New	+$5.68M	0.25%	70

Other funds holding PRTA

EcoR1 Capital San Francisco, California $2.06B AUM 215.32% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 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

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

Janus Henderson Group London $209B AUM 37.72% 1-Year Est. Return

PAI

Palo Alto Investors Palo Alto, California $724M AUM 96.91% 1-Year Est. Return

FLAM

First Light Asset Management Edina, Minnesota $1.65B AUM 203.21% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Avidity Partners Management's PRTA Position: Q4 2023 in Review

Avidity Partners Management sold out of Prothena Corp (PRTA) in Q4 2023, closing a stake of 382,305 shares — an estimated $18.4M sold.

Avidity Partners Management first reported a position in PRTA in Q2 2021 and held it in 6 quarters. The position peaked at $178M in Q4 2022. 187 funds tracked by Wall St. Rank hold PRTA as of Q4 2023.

Avidity Partners Management reported no remaining Prothena Corp position as of Q4 2023 after selling out during the quarter.
Avidity Partners Management sold 382,305 Prothena Corp shares in Q4 2023, an estimated $18.4M.
Avidity Partners Management first reported a position in Prothena Corp in Q2 2021 and held it in 6 quarters.
Avidity Partners Management's Prothena Corp position peaked at $178M in Q4 2022.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q4 2023.

Based on Avidity Partners Management's 13F filing for Q4 2023, filed 14 Feb 2024.