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GROUP ONE TRADING LLC

Position in PRTA — Prothena Corp Public Ltd Co

CIK 932540 CHICAGO, IL

Position in PRTA

as of Mar 31, 2026 · filed May 13, 2026
Position Value
$33,203
-$34,619 QoQ
Shares Held
3,416
-50.8% QoQ
Ownership
0.007%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2020
17 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in PRTA Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $113,695,832 across 200 Biotechnology names.

# Ticker Company Shares Value (USD) Open

All Filings in PRTA

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17 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $33,203 3,416
2025-09-30 $67,822 6,949
2025-06-30 $195,806 32,258
2024-12-31 $66,812 4,824
2024-09-30 $124,370 7,434
2024-06-30 $128,649 6,233
2024-03-31 $56,871 2,296
2023-12-31 $997,751 27,456
2022-09-30 $231,182 3,813
2022-03-31 $37,630 1,029
2021-12-31 $206,887 4,188
2021-09-30 $137,972 1,937
2021-03-31 $189,656 7,550
2020-12-31 $149,476 12,446
2020-09-30 $102,247 10,235
2020-06-30 $89,380 8,545
2020-03-31 $201,823 18,862