Engineers Gate Manager’s Prothena Corp PRTA Stock Holding History

Engineers Gate Manager’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 Q2	$404K	Buy	+41,270	New	+$407K	0.01%	1629
2025 Q4	–	Sell	-56,080	Closed	-$547K	–	2451
2025 Q3	$547K	Buy	56,080 +15,113	+37%	+$116K	0.01%	1477
2025 Q2	$249K	Buy	+40,967	New	+$307K	﹤0.01%	1808
2024 Q1	–	Sell	-36,523	Closed	-$1.33M	–	2231
2023 Q4	$1.33M	Buy	36,523 +25,139	+221%	+$968K	0.04%	642
2023 Q3	$549K	Buy	11,384 +7,683	+208%	+$456K	0.02%	1014
2023 Q2	$253K	Sell	3,701 -10,720	-74%	-$691K	0.01%	1375
2023 Q1	$699K	Buy	14,421 +10,286	+249%	+$543K	0.03%	808
2022 Q4	$249K	Buy	+4,135	New	+$242K	0.02%	1274
2022 Q2	–	Sell	-21,992	Closed	-$804K	–	2187
2022 Q1	$804K	Buy	+21,992	New	+$793K	0.03%	795
2021 Q4	–	Sell	-10,469	Closed	-$746K	–	2237
2021 Q3	$746K	Sell	10,469 -341	-3%	-$21.2K	0.04%	651
2021 Q2	$556K	Buy	+10,810	New	+$337K	0.04%	770

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

Engineers Gate Manager's PRTA Position: Q2 2026 in Review

Engineers Gate Manager opened a new position in Prothena Corp (PRTA) in Q2 2026: 41,270 shares worth $404K. The stake represents 0.01% of the portfolio and ranks #1629 among its holdings. This is a return to the name: Engineers Gate Manager previously reported a position in PRTA as recently as Q3 2025.

Engineers Gate Manager first reported a position in PRTA in Q2 2021 and has held it in 11 quarters since. The position peaked at $1.33M in Q4 2023. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Engineers Gate Manager held 41,270 shares of Prothena Corp worth $404K as of Q2 2026.
Prothena Corp was a new Engineers Gate Manager position in Q2 2026.
Prothena Corp made up 0.01% of Engineers Gate Manager's portfolio in Q2 2026, its #1629 holding.
Engineers Gate Manager first reported a position in Prothena Corp in Q2 2021 and has held it in 11 quarters since.
Engineers Gate Manager's Prothena Corp position peaked at $1.33M in Q4 2023.
188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Engineers Gate Manager's 13F filing for Q2 2026, filed 14 Aug 2026.