BioCryst Pharmaceuticals, Inc.
MX ˙ BMV ˙ US09058V1035
SecurityMX:BCRX / BioCryst Pharmaceuticals, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership71,164 shares
Latest Disclosed Value $ 677,481
Citigroup Inc ownership in BCRX / BioCryst Pharmaceuticals, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 71,164 shares of BioCryst Pharmaceuticals, Inc. (MX:BCRX) valued at $677,481 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 58,269 shares of BioCryst Pharmaceuticals, Inc.. This represents a change in shares of 22.13% during the quarter.

Citigroup Inc has a history of taking positions in derivatives of the underlying security (BCRX) in the form of stock options. The firm currently holds call options representing 95,000 of underlying shares valued at $904,400 USD and put options representing 95,000 of underlying shares valued at $904,400 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.

MX:BCRX / BioCryst Pharmaceuticals, 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 BIOCRYST PHARMACEUTICALS COM 09058V103 71,164 12,895 22.13 677 49.12 0.0001
2026-02-13 2025-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 58,269 29,922 105.56 454 111.16 0.0002
2025-11-10 2025-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 28,347 -118,178 -80.65 215 -83.61 0.0001
2025-08-11 2025-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 146,525 -205,658 -58.40 1,313 -50.32 0.0006
2025-05-12 2025-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 352,183 75,481 27.28 2,641 26.97 0.0014
2025-02-12 2024-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 276,702 123,779 80.94 2,081 79.00 0.0012
2024-11-12 2024-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 152,923 35,978 30.76 1,162 60.94 0.0007
2024-08-12 2024-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 116,945 -2,157,830 -94.86 723 -93.75 0.0005
2024-05-10 2024-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 2,274,775 1,080,811 90.52 11,556 61.59 0.0076
2024-02-09 2023-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 1,193,964 822,092 221.07 7,152 171.69 0.0050
2023-12-06 2023-09-30 13F/A-1 BIOCRYST PHARMACEUTICALS COM 09058V103 371,872 19,329 5.48 2,633 6.09 0.0020
2023-11-09 2023-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 371,872 19,329 2,633 0.0008
2023-08-10 2023-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 352,543 -306,924 -46.54 2,482 -54.88 0.0016
2023-05-11 2023-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 659,467 318,249 93.27 5,500 40.39 0.0039
2023-02-09 2022-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 341,218 -133,361 -28.10 3,917 -34.50 0.0031
2022-11-10 2022-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 474,579 68,691 16.92 5,980 39.26 0.0043
2022-08-10 2022-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 405,888 338,824 505.22 4,294 293.58 0.0032
2022-05-12 2022-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 67,064 -321,814 -82.75 1,091 -79.74 0.0007
2022-02-10 2021-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 388,878 226,689 139.77 5,386 131.06 0.0029
2021-11-10 2021-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 162,189 -139,625 -46.26 2,331 -51.15 0.0014
2021-08-10 2021-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 301,814 -60,351 -16.66 4,772 29.57 0.0029
2021-05-13 2021-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 362,165 287,904 387.69 3,683 564.80 0.0024
2021-02-11 2020-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 74,261 4,069 5.80 554 128.93 0.0003
2020-11-12 2020-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 70,192 -241,510 -77.48 242 -83.70 0.0002
2020-08-12 2020-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 311,702 167,233 115.76 1,485 415.63 0.0012
2020-05-12 2020-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 144,469 -55,046 -27.59 288 -58.14 0.0003
2020-02-12 2019-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 199,515 -165,838 -45.39 688 -34.29 0.0005
2019-11-08 2019-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 365,353 -14,295 -3.77 1,047 -27.24 0.0008
2019-08-12 2019-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 379,648 352,727 1,310.23 1,439 557.08 0.0012
2019-05-13 2019-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 26,921 -213,395 -88.80 219 -88.71 0.0002
2019-02-12 2018-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 240,316 115,418 92.41 1,940 103.57 0.0020
2018-11-13 2018-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 124,898 39,265 45.85 953 94.09 0.0009
2018-08-10 2018-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 85,633 -53,069 -38.26 491 -25.83 0.0005
2018-05-11 2018-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 138,702 -16,879 -10.85 662 -13.35 0.0005
2018-02-12 2017-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 155,581 127,326 450.63 764 416.22 0.0006
2017-11-13 2017-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 28,255 -43,226 -60.47 148 -62.81 0.0001
2017-08-11 2017-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 71,481 68,141 2,040.15 398 1,321.43 0.0004
2017-05-12 2017-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 3,340 -23,851 -87.72 28 -83.72 0.0000
2017-02-10 2016-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 27,191 25,050 1,170.01 172 1,620.00 0.0002
2016-11-10 2016-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 2,141 -19,297 -90.01 10 -83.61 0.0000
2016-08-12 2016-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 21,438 -34,026 -61.35 61 -61.15 0.0001
2016-05-13 2016-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 55,464 30,629 123.33 157 -38.91 0.0002
2016-02-12 2015-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 24,835 -36,872 -59.75 257 -63.44 0.0003
2015-11-13 2015-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 61,707 33,339 117.52 703 66.19 0.0007
2015-08-13 2015-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 28,368 -3,306 -10.44 423 47.90 0.0004
2015-05-14 2015-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 31,674 -235 -0.74 286 -26.48 0.0003
2015-02-17 2014-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 31,909 24,910 355.91 389 472.06 0.0003
2014-11-14 2014-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 6,999 -1,975 -22.01 68 -40.87 0.0001
2014-08-14 2014-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 8,974 371 4.31 115 26.37 0.0001
2014-05-15 2014-03-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 8,603 2,035 30.98 91 82.00 0.0001
2014-02-14 2013-12-31 13F BIOCRYST PHARMACEUTICALS COM 09058V103 6,568 4,527 221.80 50 233.33 0.0000
2013-11-14 2013-09-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 2,041 -149 -6.80 15 400.00 0.0000
2013-08-14 2013-06-30 13F BIOCRYST PHARMACEUTICALS COM 09058V103 2,190 2,190 3 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
(%)
2026-05-11 2026-03-31 13F BIOCRYST PHARMACEUTICALS COM Call 95,000 47,400.00 904 90,300.00 n/a n/a n/a
2026-02-13 2025-12-31 13F BIOCRYST PHARMACEUTICALS COM Call 200 2 n/a n/a n/a
2024-02-09 2023-12-31 13F BIOCRYST PHARMACEUTICALS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-12-06 2023-09-30 13F/A BIOCRYST PHARMACEUTICALS COM Call 39,900 0.00 282 0.71 n/a n/a n/a
2023-11-09 2023-09-30 13F BIOCRYST PHARMACEUTICALS COM Call 39,900 282 n/a n/a n/a
2023-08-10 2023-06-30 13F BIOCRYST PHARMACEUTICALS COM Call 39,900 281 n/a n/a n/a
2021-05-13 2021-03-31 13F BIOCRYST PHARMACEUTICALS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F BIOCRYST PHARMACEUTICALS COM Call 19,700 556.67 147 1,370.00 n/a n/a n/a
2020-11-12 2020-09-30 13F BIOCRYST PHARMACEUTICALS COM Call 3,000 -84.13 10 -88.89 n/a n/a n/a
2020-08-12 2020-06-30 13F BIOCRYST PHARMACEUTICALS COM Call 18,900 67.26 90 291.30 n/a n/a n/a
2020-05-12 2020-03-31 13F BIOCRYST PHARMACEUTICALS COM Call 11,300 232.35 23 91.67 n/a n/a n/a
2020-02-12 2019-12-31 13F BIOCRYST PHARMACEUTICALS COM Call 3,400 30.77 12 71.43 n/a n/a n/a
2019-11-08 2019-09-30 13F BIOCRYST PHARMACEUTICALS COM Call 2,600 -65.79 7 -75.86 n/a n/a n/a
2019-08-12 2019-06-30 13F BIOCRYST PHARMACEUTICALS COM Call 7,600 20.63 29 -43.14 n/a n/a n/a
2019-05-13 2019-03-31 13F BIOCRYST PHARMACEUTICALS COM Call 6,300 6.78 51 6.25 n/a n/a n/a
2019-02-12 2018-12-31 13F BIOCRYST PHARMACEUTICALS COM Call 5,900 7.27 48 14.29 n/a n/a n/a
2018-11-13 2018-09-30 13F BIOCRYST PHARMACEUTICALS COM Call 5,500 223.53 42 320.00 n/a n/a n/a
2018-08-10 2018-06-30 13F BIOCRYST PHARMACEUTICALS COM Call 1,700 -41.38 10 -28.57 n/a n/a n/a
2018-05-11 2018-03-31 13F BIOCRYST PHARMACEUTICALS COM Call 2,900 -73.39 14 -74.07 n/a n/a n/a
2018-02-12 2017-12-31 13F BIOCRYST PHARMACEUTICALS COM Call 10,900 -11.38 54 -15.62 n/a n/a n/a
2017-11-13 2017-09-30 13F BIOCRYST PHARMACEUTICALS COM Call 12,300 -27.22 64 -31.91 n/a n/a n/a
2017-08-11 2017-06-30 13F BIOCRYST PHARMACEUTICALS COM Call 16,900 156.06 94 70.91 n/a n/a n/a
2017-05-12 2017-03-31 13F BIOCRYST PHARMACEUTICALS COM Call 6,600 -65.98 55 -55.28 n/a n/a n/a
2017-02-10 2016-12-31 13F BIOCRYST PHARMACEUTICALS COM Call 19,400 3,133.33 123 4,000.00 n/a n/a n/a
2016-11-10 2016-09-30 13F BIOCRYST PHARMACEUTICALS COM Call 600 3 n/a n/a n/a
2014-11-14 2014-09-30 13F BIOCRYST PHARMACEUTICALS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2014-08-14 2014-06-30 13F BIOCRYST PHARMACEUTICALS COM Call 1,800 23 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
(%)
2026-05-11 2026-03-31 13F BIOCRYST PHARMACEUTICALS COM Put 95,000 47,400.00 904 90,300.00 n/a n/a n/a
2026-02-13 2025-12-31 13F BIOCRYST PHARMACEUTICALS COM Put 200 2 n/a n/a n/a
2024-02-09 2023-12-31 13F BIOCRYST PHARMACEUTICALS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-12-06 2023-09-30 13F/A BIOCRYST PHARMACEUTICALS COM Put 39,900 0.00 282 0.71 n/a n/a n/a
2023-11-09 2023-09-30 13F BIOCRYST PHARMACEUTICALS COM Put 39,900 282 n/a n/a n/a
2023-08-10 2023-06-30 13F BIOCRYST PHARMACEUTICALS COM Put 39,900 281 n/a n/a n/a
2021-05-13 2021-03-31 13F BIOCRYST PHARMACEUTICALS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-11 2020-12-31 13F BIOCRYST PHARMACEUTICALS COM Put 19,900 947.37 148 2,014.29 n/a n/a n/a
2020-11-12 2020-09-30 13F BIOCRYST PHARMACEUTICALS COM Put 1,900 -13.64 7 -30.00 n/a n/a n/a
2020-08-12 2020-06-30 13F BIOCRYST PHARMACEUTICALS COM Put 2,200 10.00 10 150.00 n/a n/a n/a
2020-05-12 2020-03-31 13F BIOCRYST PHARMACEUTICALS COM Put 2,000 -37.50 4 -63.64 n/a n/a n/a
2020-02-12 2019-12-31 13F BIOCRYST PHARMACEUTICALS COM Put 3,200 11 n/a n/a n/a
2019-11-08 2019-09-30 13F BIOCRYST PHARMACEUTICALS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2019-08-12 2019-06-30 13F BIOCRYST PHARMACEUTICALS COM Put 6,200 933.33 23 360.00 n/a n/a n/a
2019-05-13 2019-03-31 13F BIOCRYST PHARMACEUTICALS COM Put 600 -95.62 5 -95.50 n/a n/a n/a
2019-02-12 2018-12-31 13F BIOCRYST PHARMACEUTICALS COM Put 13,700 -22.60 111 -17.78 n/a n/a n/a
2018-11-13 2018-09-30 13F BIOCRYST PHARMACEUTICALS COM Put 17,700 60.91 135 114.29 n/a n/a n/a
2018-08-10 2018-06-30 13F BIOCRYST PHARMACEUTICALS COM Put 11,000 266.67 63 350.00 n/a n/a n/a
2018-05-11 2018-03-31 13F BIOCRYST PHARMACEUTICALS COM Put 3,000 14 n/a n/a n/a
2018-02-12 2017-12-31 13F BIOCRYST PHARMACEUTICALS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2017-11-13 2017-09-30 13F BIOCRYST PHARMACEUTICALS COM Put 1,700 -60.47 9 -62.50 n/a n/a n/a
2017-08-11 2017-06-30 13F BIOCRYST PHARMACEUTICALS COM Put 4,300 -27.12 24 -52.00 n/a n/a n/a
2017-05-12 2017-03-31 13F BIOCRYST PHARMACEUTICALS COM Put 5,900 -6.35 50 25.00 n/a n/a n/a
2017-02-10 2016-12-31 13F BIOCRYST PHARMACEUTICALS COM Put 6,300 40 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.