Sittner & Nelson’s Prothena Corp PRTA Stock Holding History

Sittner & Nelson’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	$1.52K	Hold	155	–	–	﹤0.01%	551
2026 Q1	$1.51K	Sell	155 -30	-16%	-$275	﹤0.01%	527
2025 Q4	$1.65K	Buy	185 +30	+19%	+$305	﹤0.01%	486
2025 Q3	$1.51K	Hold	155	–	–	﹤0.01%	454
2025 Q2	$941	Hold	155	–	–	﹤0.01%	478
2025 Q1	$1.92K	Hold	155	–	–	﹤0.01%	443
2024 Q4	$2.15K	Hold	155	–	–	﹤0.01%	415
2024 Q3	$2.59K	Hold	155	–	–	﹤0.01%	398
2024 Q2	$3.2K	Hold	155	–	–	﹤0.01%	409
2024 Q1	$3.84K	Hold	155	–	–	﹤0.01%	406
2023 Q4	$5.63K	Hold	155	–	–	﹤0.01%	380
2023 Q3	$7.48K	Hold	155	–	–	﹤0.01%	356
2023 Q2	$10.6K	Hold	155	–	–	0.01%	341
2023 Q1	$7.51K	Hold	155	–	–	﹤0.01%	377
2022 Q4	$9.34K	Hold	155	–	–	0.01%	350
2022 Q3	$9K	Hold	155	–	–	0.01%	342
2022 Q2	$4K	Hold	155	–	–	﹤0.01%	423
2022 Q1	$6K	Hold	155	–	–	﹤0.01%	381
2021 Q4	$8K	Hold	155	–	–	﹤0.01%	356
2021 Q3	$11K	Hold	155	–	–	0.01%	315
2021 Q2	$8K	Hold	155	–	–	0.01%	317
2021 Q1	$4K	Hold	155	–	–	﹤0.01%	346
2020 Q4	$2K	Buy	+155	New	+$1.83K	﹤0.01%	394

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

Sittner & Nelson's PRTA Position: Q2 2026 in Review

Sittner & Nelson held its Prothena Corp (PRTA) position steady in Q2 2026 at 155 shares worth $1.52K. The position accounts for ﹤0.01% of the portfolio, ranked #551.

Sittner & Nelson first reported a position in PRTA in Q4 2020 and has held it in 23 quarters since. The position peaked at $11K in Q3 2021. 188 funds tracked by Wall St. Rank hold PRTA as of Q2 2026.

Sittner & Nelson held 155 shares of Prothena Corp worth $1.52K as of Q2 2026.
Sittner & Nelson left its Prothena Corp share count unchanged in Q2 2026.
Prothena Corp made up ﹤0.01% of Sittner & Nelson's portfolio in Q2 2026, its #551 holding.
Sittner & Nelson first reported a position in Prothena Corp in Q4 2020 and has held it in 23 quarters since.
Sittner & Nelson's Prothena Corp position peaked at $11K in Q3 2021.
188 funds tracked by Wall St. Rank held Prothena Corp as of Q2 2026.

Based on Sittner & Nelson's 13F filing for Q2 2026, filed 7 Aug 2026.