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GROUP ONE TRADING LLC

Position in RARE — Ultragenyx Pharmaceutical Inc.

CIK 932540 CHICAGO, IL

Position in RARE

as of Mar 31, 2026 · filed May 13, 2026
Position Value
$2,936,477
+$2,402,693 QoQ
Shares Held
140,166
+504.0% QoQ
Ownership
0.142%
of shares outstanding
% of Portfolio
0.11%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2020
16 quarters on record
Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in RARE Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Mar 31, 2026

GROUP ONE TRADING LLC holds $126,528,527 across 209 Biotechnology names. RARE ranks #12 (2.3% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in RARE

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16 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $2,936,477 140,166
2025-12-31 $533,784 23,208
2025-06-30 $202,125 5,559
2024-12-31 $151,872 3,610
2024-09-30 $553,222 9,959
2024-06-30 $430,317 10,470
2024-03-31 $426,513 9,135
2023-12-31 $300,500 6,284
2023-09-30 $202,955 5,693
2023-03-31 $346,784 8,648
2021-12-31 $10,931 130
2021-09-30 $2,705 30
2021-06-30 $85,910 901
2021-03-31 $11,044 97
2020-06-30 $7,900 101
2020-03-31 $52,338 1,178