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CITADEL ADVISORS LLC

Position in RARE — Ultragenyx Pharmaceutical Inc.

CIK 1423053 MIAMI, FL

Position in RARE

as of Mar 31, 2026 · filed May 15, 2026
Position Value
$44,319,536
-$9,181,339 QoQ
Shares Held
2,115,491
-9.1% QoQ
Ownership
2.15%
of shares outstanding
% of Portfolio
0.03%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2020
25 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)

Derivatives in RARE

reported options exposure · as of Mar 31, 2026
CallValue
$2,683,695
CallShares
128,100
PutValue
$2,677,410
PutShares
127,800

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Mar 31, 2026

CITADEL ADVISORS LLC holds $5,783,571,443 across 373 Biotechnology names. RARE ranks #31 (0.8% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in RARE

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $2,677,410 127,800
2026-03-31 $2,683,695 128,100
2026-03-31 $44,319,536 2,115,491
2025-12-31 $6,854,000 298,000
2025-12-31 $864,800 37,600
2025-12-31 $53,500,875 2,326,125
2025-09-30 $5,107,584 169,800
2025-09-30 $9,955,065 330,953
2025-09-30 $2,731,264 90,800
2025-06-30 $1,368,117 37,627
2025-06-30 $2,468,844 67,900
2025-06-30 $552,672 15,200
2025-03-31 $2,556,426 70,600
2025-03-31 $644,538 17,800
2025-03-31 $9,289,639 256,549
2024-12-31 $2,515,786 59,800
2024-12-31 $1,220,030 29,000
2024-12-31 $12,039,549 286,179
2024-09-30 $1,933,140 34,800
2024-09-30 $1,249,875 22,500
2024-09-30 $2,663,789 47,953
2024-06-30 $961,740 23,400
2024-06-30 $1,306,980 31,800
2024-06-30 $7,149,261 173,948
2024-03-31 $13,694,409 293,305
2024-03-31 $1,806,903 38,700
2024-03-31 $1,438,052 30,800
2023-12-31 $1,200,282 25,100
2023-12-31 $9,566,582 200,054
2023-12-31 $1,286,358 26,900
2023-09-30 $670,220 18,800
2023-09-30 $49,945 1,401
2023-09-30 $937,595 26,300
2023-06-30 $216,811 4,700
2023-06-30 $396,718 8,600
2023-06-30 $12,763,386 276,683
2023-03-31 $22,368,421 557,816
2023-03-31 $376,940 9,400
2023-03-31 $144,360 3,600
2022-12-31 $2,636,177 56,900
2022-12-31 $796,876 17,200
2022-12-31 $10,191,487 219,976
2022-09-30 $1,614,990 39,000
2022-09-30 $3,863,553 93,300
2022-09-30 $7,578,278 183,006
2022-06-30 $1,211,098 20,300
2022-06-30 $1,181,268 19,800
2022-06-30 $60,692,296 1,017,303
2022-03-31 $646,318 8,900
2022-03-31 $95,497,623 1,315,032