Cogent Biosciences, Inc.
US ˙ NasdaqGS ˙ US19240Q2012

SecurityCOGT / Cogent Biosciences, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership32,925 shares
Latest Disclosed Value $ 1,267,283
Citigroup Inc reports 52.04% decrease in ownership of COGT / Cogent Biosciences, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 32,925 shares of Cogent Biosciences, Inc. (US:COGT) valued at $1,267,283 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 68,653 shares of Cogent Biosciences, Inc.. This represents a change in shares of -52.04% during the quarter. The current value of the position is $1,062,160 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 COGENT BIOSCIENCES COM 19240Q201 32,925 -35,728 -52.04 1,267 -48.03 0.0005
2026-02-13 2025-12-31 13F COGENT BIOSCIENCES COM 19240Q201 68,653 54,245 376.49 2,439 1,083.50 0.0011
2025-11-10 2025-09-30 13F COGENT BIOSCIENCES COM 19240Q201 14,408 -45,317 -75.88 207 -51.87 0.0001
2025-08-11 2025-06-30 13F COGENT BIOSCIENCES COM 19240Q201 59,725 -137,282 -69.68 429 -63.73 0.0002
2025-05-12 2025-03-31 13F COGENT BIOSCIENCES COM 19240Q201 197,007 52,553 36.38 1,180 4.80 0.0006
2025-02-12 2024-12-31 13F COGENT BIOSCIENCES COM 19240Q201 144,454 76,038 111.14 1,127 52.57 0.0007
2024-11-12 2024-09-30 13F COGENT BIOSCIENCES COM 19240Q201 68,416 29,086 73.95 739 122.96 0.0004
2024-08-12 2024-06-30 13F COGENT BIOSCIENCES COM 19240Q201 39,330 -560,659 -93.44 332 -91.79 0.0002
2024-05-10 2024-03-31 13F COGENT BIOSCIENCES COM 19240Q201 599,989 478,138 392.40 4,032 462.99 0.0026
2024-02-09 2023-12-31 13F COGENT BIOSCIENCES COM 19240Q201 121,851 39,610 48.16 716 -10.61 0.0005
2023-12-06 2023-09-30 13F/A-1 COGENT BIOSCIENCES COM 19240Q201 82,241 2,522 3.16 802 -15.06 0.0006
2023-11-09 2023-09-30 13F COGENT BIOSCIENCES COM 19240Q201 82,241 2,522 802 0.0002
2023-08-10 2023-06-30 13F COGENT BIOSCIENCES COM 19240Q201 79,719 -114,871 -59.03 944 -55.07 0.0006
2023-05-11 2023-03-31 13F COGENT BIOSCIENCES COM 19240Q201 194,590 50,605 35.15 2,100 26.14 0.0015
2023-02-09 2022-12-31 13F COGENT BIOSCIENCES COM 19240Q201 143,985 -48,287 -25.11 1,664 -42.00 0.0013
2022-11-10 2022-09-30 13F COGENT BIOSCIENCES COM 19240Q201 192,272 57,268 42.42 2,869 135.55 0.0021
2022-08-10 2022-06-30 13F COGENT BIOSCIENCES COM 19240Q201 135,004 1,235 0.92 1,218 21.56 0.0009
2022-05-12 2022-03-31 13F COGENT BIOSCIENCES COM 19240Q201 133,769 -8,229 -5.80 1,002 -17.73 0.0006
2022-02-10 2021-12-31 13F COGENT BIOSCIENCES COM 19240Q201 141,998 -112,681 -44.24 1,218 -43.14 0.0007
2021-11-10 2021-09-30 13F COGENT BIOSCIENCES COM 19240Q201 254,679 216 0.08 2,142 3.78 0.0013
2021-08-10 2021-06-30 13F COGENT BIOSCIENCES COM 19240Q201 254,463 -38,851 -13.25 2,064 -19.84 0.0012
2021-05-13 2021-03-31 13F UNUM THERAPEUTICS COM 19240Q201 293,314 253,048 628.44 2,575 469.69 0.0017
2021-02-11 2020-12-31 13F COGENT BIOSCIENCES COM 19240Q201 40,266 40,266 452 0.0003
2020-05-12 2020-03-31 13F UNUM THERAPEUTICS COM 903214104 0 -2,153 -100.00 0 -100.00
2020-02-12 2019-12-31 13F UNUM THERAPEUTICS COM 903214104 2,153 7 0.33 2 -33.33 0.0000
2019-11-08 2019-09-30 13F UNUM THERAPEUTICS COM 903214104 2,146 0 0.00 3 -50.00 0.0000
2019-08-12 2019-06-30 13F UNUM THERAPEUTICS COM 903214104 2,146 -3,553 -62.34 6 -76.00 0.0000
2019-05-13 2019-03-31 13F UNUM THERAPEUTICS COM 903214104 5,699 1,302 29.61 25 31.58 0.0000
2019-02-12 2018-12-31 13F UNUM THERAPEUTICS COM 903214104 4,397 3,423 351.44 19 90.00 0.0000
2018-11-13 2018-09-30 13F UNUM THERAPEUTICS COM 903214104 974 465 91.36 10 42.86 0.0000
2018-08-10 2018-06-30 13F UNUM THERAPEUTICS COM 903214104 509 509 7 0.0000
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.