Northwestern Mutual Wealth Management’s Prothena Corp PRTA Stock Holding History

Northwestern Mutual Wealth 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
2026 Q2	$4.89K	Buy	500 +450	+900%	+$4.44K	﹤0.01%	3386
2026 Q1	$486	Sell	50 -4	-7%	-$37	﹤0.01%	3855
2025 Q4	$516	Buy	54 +4	+8%	+$41	﹤0.01%	3715
2025 Q3	$488	Buy	+50	New	+$384	﹤0.01%	3636
2023 Q1	–	Sell	-211	Closed	-$12.7K	–	3540
2022 Q4	$12.7K	Buy	+211	New	+$12.4K	﹤0.01%	2406
2022 Q1	–	Sell	-73	Closed	-$4K	–	3333
2021 Q4	$4K	Buy	+73	New	+$4.05K	﹤0.01%	2849
2017 Q1	–	Sell	-22	Closed	-$1K	–	2318
2016 Q4	$1K	Buy	22 +9	+69%	+$497	﹤0.01%	2218
2016 Q3	$1K	Sell	13 -35	-73%	-$1.88K	﹤0.01%	2076
2016 Q2	$1K	Buy	48 +35	+269%	+$1.52K	﹤0.01%	1969
2016 Q1	$1K	Buy	+13	New	+$509	﹤0.01%	2030

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 $3.38T AUM 44.17% 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

Northwestern Mutual Wealth Management's PRTA Position: Q2 2026 in Review

Northwestern Mutual Wealth Management increased its Prothena Corp (PRTA) stake by 900% in Q2 2026, buying an estimated $4.44K and bringing the position to 500 shares worth $4.89K. The position accounts for ﹤0.01% of the portfolio, ranked #3386.

Northwestern Mutual Wealth Management first reported a position in PRTA in Q1 2016 and has held it in 10 quarters since. The position peaked at $12.7K in Q4 2022. 187 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Northwestern Mutual Wealth Management held 500 shares of Prothena Corp worth $4.89K as of Q2 2026.
Northwestern Mutual Wealth Management bought 450 Prothena Corp shares in Q2 2026, an estimated $4.44K.
Prothena Corp made up ﹤0.01% of Northwestern Mutual Wealth Management's portfolio in Q2 2026, its #3386 holding.
Northwestern Mutual Wealth Management first reported a position in Prothena Corp in Q1 2016 and has held it in 10 quarters since.
Northwestern Mutual Wealth Management's Prothena Corp position peaked at $12.7K in Q4 2022.
187 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Northwestern Mutual Wealth Management's 13F filing for Q2 2026, filed 12 Aug 2026.