Black Diamond Therapeutics, Inc.
US ˙ NasdaqGS ˙ US09203E1055

SecurityBDTX / Black Diamond Therapeutics, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership1,592 shares
Latest Disclosed Value $ 3,391
Citigroup Inc reports 93.38% decrease in ownership of BDTX / Black Diamond Therapeutics, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 1,592 shares of Black Diamond Therapeutics, Inc. (US:BDTX) valued at $3,391 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 24,034 shares of Black Diamond Therapeutics, Inc.. This represents a change in shares of -93.38% during the quarter. The current value of the position is $3,327 USD.

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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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 BLACK DIAMOND THERAPEUTICS I COM 09203E105 1,592 -22,442 -93.38 3 -94.83 0.0000
2026-02-13 2025-12-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 24,034 23,123 2,538.20 58 1,833.33 0.0000
2025-11-10 2025-09-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 911 -30,903 -97.14 3 -96.15 0.0000
2025-08-11 2025-06-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 31,814 1,848 6.17 79 69.57 0.0000
2025-05-12 2025-03-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 29,966 -1,503 -4.78 46 -31.34 0.0000
2025-02-12 2024-12-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 31,469 2,664 9.25 67 -46.40 0.0000
2024-11-12 2024-09-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 28,805 20,642 252.87 125 228.95 0.0001
2024-08-12 2024-06-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 8,163 -104,288 -92.74 38 -93.33 0.0000
2024-05-10 2024-03-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 112,451 58,327 107.77 570 275.00 0.0004
2024-02-09 2023-12-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 54,124 -7,224 -11.78 152 -13.64 0.0001
2023-12-06 2023-09-30 13F/A-1 BLACK DIAMOND THERAPEUTICS I COM 09203E105 61,348 61,348 176 0.0001
2023-11-09 2023-09-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 61,348 61,348 176 0.0001
2023-05-11 2023-03-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 0 -135 -100.00 0 0.0000
2023-02-09 2022-12-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 135 -438 -76.44 0 -100.00 0.0000
2022-11-10 2022-09-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 573 -481 -45.64 1 -66.67 0.0000
2022-08-10 2022-06-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 1,054 -908 -46.28 3 -40.00 0.0000
2022-05-12 2022-03-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 1,962 -4,934 -71.55 5 -86.49 0.0000
2022-02-10 2021-12-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 6,896 -42,002 -85.90 37 -91.06 0.0000
2021-11-10 2021-09-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 48,898 -7,302 -12.99 414 -39.56 0.0002
2021-08-10 2021-06-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 56,200 -71,691 -56.06 685 -77.92 0.0004
2021-05-13 2021-03-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 127,891 120,421 1,612.06 3,103 1,198.33 0.0020
2021-02-11 2020-12-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 7,470 4,614 161.55 239 177.91 0.0001
2020-11-12 2020-09-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 2,856 -1,133 -28.40 86 -49.11 0.0001
2020-08-12 2020-06-30 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 3,989 452 12.78 169 92.05 0.0001
2020-05-12 2020-03-31 13F BLACK DIAMOND THERAPEUTICS I COM 09203E105 3,537 3,537 88 0.0001
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.