Ultragenyx Pharmaceutical Inc.
US ˙ NasdaqGS ˙ US90400D1081

SecurityRARE / Ultragenyx Pharmaceutical Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership315,440 shares
Latest Disclosed Value $ 6,608,469
Citigroup Inc ownership in RARE / Ultragenyx Pharmaceutical Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 315,440 shares of Ultragenyx Pharmaceutical Inc. (US:RARE) valued at $6,608,468 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 69,511 shares of Ultragenyx Pharmaceutical Inc.. This represents a change in shares of 353.80% during the quarter. The current value of the position is $7,069,010 USD.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (RARE) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

RARE / Ultragenyx Pharmaceutical Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 315,440 245,929 353.80 6,608 313.52 0.0014
2026-02-13 2025-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 69,511 43,322 165.42 1,599 103.05 0.0007
2025-11-10 2025-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 26,189 -5,631 -17.70 788 -31.92 0.0004
2025-08-11 2025-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 31,820 -81,308 -71.87 1,157 -71.78 0.0006
2025-05-12 2025-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 113,128 46,207 69.05 4,096 45.51 0.0021
2025-02-12 2024-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 66,921 23,428 53.87 2,815 16.51 0.0017
2024-11-12 2024-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 43,493 23,018 112.42 2,416 187.28 0.0014
2024-08-12 2024-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 20,475 -136,374 -86.95 842 -88.52 0.0005
2024-05-10 2024-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 156,849 46,339 41.93 7,323 38.59 0.0048
2024-02-09 2023-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 110,510 19,930 22.00 5,285 63.64 0.0037
2023-12-06 2023-09-30 13F/A-1 ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 90,580 19,113 26.74 3,229 -2.03 0.0024
2023-11-09 2023-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 90,580 19,113 3,229 0.0024
2023-08-10 2023-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 71,467 -84,568 -54.20 3,297 -47.32 0.0022
2023-05-11 2023-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 156,035 62,510 66.84 6,257 44.40 0.0044
2023-02-09 2022-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 93,525 -39,859 -29.88 4,333 -21.56 0.0035
2022-11-10 2022-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 133,384 48,918 57.91 5,524 9.62 0.0040
2022-08-10 2022-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 84,466 61,083 261.23 5,039 196.76 0.0038
2022-05-12 2022-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 23,383 -35,565 -60.33 1,698 -65.75 0.0010
2022-02-10 2021-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 58,948 29,199 98.15 4,957 84.76 0.0027
2021-11-10 2021-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 29,749 -25,416 -46.07 2,683 -48.98 0.0016
2021-08-10 2021-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 55,165 7,137 14.86 5,259 -3.84 0.0032
2021-05-13 2021-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 48,028 6,061 14.44 5,469 -5.87 0.0035
2021-02-11 2020-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 41,967 35,927 594.82 5,810 1,071.37 0.0034
2020-11-12 2020-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 6,040 -31,334 -83.84 496 -83.03 0.0003
2020-08-12 2020-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 37,374 -11,768 -23.95 2,923 33.90 0.0023
2020-05-12 2020-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 49,142 28,701 140.41 2,183 150.06 0.0020
2020-02-12 2019-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 20,441 -40,759 -66.60 873 -66.65 0.0006
2019-11-08 2019-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 61,200 28,565 87.53 2,618 26.29 0.0021
2019-08-12 2019-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 32,635 7,758 31.19 2,073 20.10 0.0017
2019-05-13 2019-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 24,877 -101,404 -80.30 1,726 -68.57 0.0017
2019-02-12 2018-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 126,281 8,370 7.10 5,491 -39.00 0.0056
2018-11-13 2018-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 117,911 106,049 894.02 9,002 888.14 0.0080
2018-08-10 2018-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 11,862 -24,017 -66.94 911 -50.19 0.0008
2018-05-11 2018-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 35,879 -5,240 -12.74 1,829 -4.09 0.0015
2018-02-12 2017-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 41,119 16,703 68.41 1,907 46.69 0.0015
2017-11-13 2017-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 24,416 -7,758 -24.11 1,300 -34.93 0.0011
2017-08-11 2017-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 32,174 13,278 70.27 1,998 56.09 0.0018
2017-05-12 2017-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 18,896 -110,048 -85.35 1,280 -85.88 0.0011
2017-02-10 2016-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 128,944 116,454 932.38 9,066 923.25 0.0082
2016-11-10 2016-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 12,490 3,555 39.79 886 102.75 0.0008
2016-08-12 2016-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 8,935 -27,950 -75.78 437 -81.28 0.0004
2016-05-13 2016-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 36,885 24,554 199.12 2,335 68.84 0.0026
2016-02-12 2015-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 12,331 10,163 468.77 1,383 561.72 0.0014
2015-11-13 2015-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 2,168 -780 -26.46 209 -30.56 0.0002
2015-08-13 2015-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 2,948 -5,203 -63.83 301 -40.51 0.0003
2015-05-14 2015-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 8,151 -1,025 -11.17 506 25.56 0.0005
2015-02-17 2014-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 9,176 8,306 954.71 403 722.45 0.0004
2014-11-14 2014-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 870 545 167.69 49 250.00 0.0000
2014-08-14 2014-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 325 301 1,254.17 14 1,300.00 0.0000
2014-05-15 2014-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 24 24 1 0.0000
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-02-13 2025-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-10 2025-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 15,700 472 n/a n/a n/a
2025-08-11 2025-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-12 2025-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 29,900 -35.00 1,083 -44.08 n/a n/a n/a
2025-02-12 2024-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 46,000 187.50 1,935 117.91 n/a n/a n/a
2024-11-12 2024-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 16,000 889 n/a n/a n/a
2024-05-10 2024-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-09 2023-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 74,500 268.81 3,563 394.72 n/a n/a n/a
2023-12-06 2023-09-30 13F/A ULTRAGENYX PHARMACEUTICAL IN COM Call 20,200 -32.44 720 -47.79 n/a n/a n/a
2023-11-09 2023-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 20,200 720 n/a n/a n/a
2023-08-10 2023-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 29,900 -45.54 1,379 -37.35 n/a n/a n/a
2023-05-11 2023-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 54,900 -29.34 2,201 -38.84 n/a n/a n/a
2023-02-09 2022-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 77,700 3,600 n/a n/a n/a
2020-05-12 2020-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-02-12 2019-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 200 -90.48 9 -90.00 n/a n/a n/a
2019-11-08 2019-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 2,100 -16.00 90 -43.40 n/a n/a n/a
2019-08-12 2019-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 2,500 -69.14 159 -71.71 n/a n/a n/a
2019-05-13 2019-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 8,100 800.00 562 1,341.03 n/a n/a n/a
2019-02-12 2018-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 900 -70.00 39 -82.97 n/a n/a n/a
2018-11-13 2018-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 3,000 100.00 229 99.13 n/a n/a n/a
2018-08-10 2018-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 1,500 200.00 115 360.00 n/a n/a n/a
2018-05-11 2018-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 500 -64.29 25 -61.54 n/a n/a n/a
2018-02-12 2017-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 1,400 -17.65 65 -28.57 n/a n/a n/a
2017-11-13 2017-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 1,700 -51.43 91 -58.06 n/a n/a n/a
2017-08-11 2017-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 3,500 -80.34 217 -82.01 n/a n/a n/a
2017-05-12 2017-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 17,800 134.21 1,206 125.84 n/a n/a n/a
2017-02-10 2016-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 7,600 245.45 534 242.31 n/a n/a n/a
2016-11-10 2016-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Call 2,200 156 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-02-13 2025-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-10 2025-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 15,700 472 n/a n/a n/a
2025-08-11 2025-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-12 2025-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 29,900 -35.00 1,083 -44.08 n/a n/a n/a
2025-02-12 2024-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 46,000 187.50 1,935 117.91 n/a n/a n/a
2024-11-12 2024-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 16,000 889 n/a n/a n/a
2024-05-10 2024-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-02-09 2023-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 74,500 268.81 3,563 394.72 n/a n/a n/a
2023-12-06 2023-09-30 13F/A ULTRAGENYX PHARMACEUTICAL IN COM Put 20,200 -32.44 720 -47.79 n/a n/a n/a
2023-11-09 2023-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 20,200 720 n/a n/a n/a
2023-08-10 2023-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 29,900 -45.54 1,379 -37.35 n/a n/a n/a
2023-05-11 2023-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 54,900 -29.34 2,201 -38.84 n/a n/a n/a
2023-02-09 2022-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 77,700 3,600 n/a n/a n/a
2020-08-12 2020-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-05-12 2020-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 7,500 -41.41 333 -39.12 n/a n/a n/a
2020-02-12 2019-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 12,800 146.15 547 146.40 n/a n/a n/a
2019-11-08 2019-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 5,200 -13.33 222 -41.73 n/a n/a n/a
2019-08-12 2019-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 6,000 13.21 381 3.53 n/a n/a n/a
2019-05-13 2019-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 5,300 307.69 368 545.61 n/a n/a n/a
2019-02-12 2018-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 1,300 -69.05 57 -82.24 n/a n/a n/a
2018-11-13 2018-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 4,200 180.00 321 179.13 n/a n/a n/a
2018-08-10 2018-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 1,500 -57.14 115 -35.39 n/a n/a n/a
2018-05-11 2018-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 3,500 -38.60 178 -32.58 n/a n/a n/a
2018-02-12 2017-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 5,700 171.43 264 135.71 n/a n/a n/a
2017-11-13 2017-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 2,100 -65.57 112 -70.45 n/a n/a n/a
2017-08-11 2017-06-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 6,100 -29.07 379 -34.99 n/a n/a n/a
2017-05-12 2017-03-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 8,600 -14.85 583 -17.89 n/a n/a n/a
2017-02-10 2016-12-31 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 10,100 1,583.33 710 1,551.16 n/a n/a n/a
2016-11-10 2016-09-30 13F ULTRAGENYX PHARMACEUTICAL IN COM Put 600 43 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.