Atika Capital Management’s Prothena Corp PRTA Stock Holding History

Atika Capital 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 Q3	–	Sell	-97,500	Closed	-$6.66M	–	95
2023 Q2	$6.66M	Buy	97,500 +48,922	+101%	+$3.16M	0.67%	53
2023 Q1	$2.35M	Sell	48,578 -42,600	-47%	-$2.25M	0.35%	65
2022 Q4	$5.49M	Buy	+91,178	New	+$5.34M	0.79%	43
2021 Q4	–	Sell	-224,600	Closed	-$16M	–	119
2021 Q3	$16M	Sell	224,600 -9,400	-4%	-$584K	0.95%	34
2021 Q2	$12M	Buy	234,000 +216,094	+1,207%	+$6.74M	0.95%	41
2021 Q1	$450K	Buy	+17,906	New	+$337K	0.04%	89
2016 Q1	–	Sell	-15,000	Closed	-$1.02M	–	56
2015 Q4	$1.02M	Buy	+15,000	New	+$905K	0.53%	46
2014 Q2	–	Sell	-57,500	Closed	-$2.2M	–	75
2014 Q1	$2.2M	Buy	57,500 +20,000	+53%	+$645K	1.88%	20
2013 Q4	$995K	Buy	+37,500	New	+$941K	0.88%	44

Other funds holding PRTA

EcoR1 Capital San Francisco, California $2.36B AUM 204.53% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

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

PAI

Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

FLAM

First Light Asset Management Edina, Minnesota $1.12B AUM 114.45% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Atika Capital Management's PRTA Position: Q3 2023 in Review

Atika Capital Management sold out of Prothena Corp (PRTA) in Q3 2023, closing a stake of 97,500 shares — an estimated $6.66M sold.

Atika Capital Management first reported a position in PRTA in Q4 2013 and held it in 9 quarters. The position peaked at $16M in Q3 2021. 186 funds tracked by Wall St. Rank hold PRTA as of Q3 2023.

Atika Capital Management reported no remaining Prothena Corp position as of Q3 2023 after selling out during the quarter.
Atika Capital Management sold 97,500 Prothena Corp shares in Q3 2023, an estimated $6.66M.
Atika Capital Management first reported a position in Prothena Corp in Q4 2013 and held it in 9 quarters.
Atika Capital Management's Prothena Corp position peaked at $16M in Q3 2021.
186 funds tracked by Wall St. Rank held Prothena Corp as of Q3 2023.

Based on Atika Capital Management's 13F filing for Q3 2023, filed 13 Nov 2023.