Keros Therapeutics, Inc.
US ˙ NasdaqGM ˙ US4923271013

SecurityKROS / Keros Therapeutics, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership561,730 shares
Latest Disclosed Value $ 6,201,499
State Street Corp reports 47.79% decrease in ownership of KROS / Keros Therapeutics, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 561,730 shares of Keros Therapeutics, Inc. (US:KROS) valued at $6,201,499 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,075,993 shares of Keros Therapeutics, Inc.. This represents a change in shares of -47.79% during the quarter. The current value of the position is $6,049,832 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)
2026-05-15 2026-03-31 13F KEROS THERAPEUTICS COM 492327101 561,730 -514,263 -47.79 6,201 -71.69 0.0002
2026-02-13 2025-12-31 13F KEROS THERAPEUTICS COM 492327101 1,075,993 -226,985 -17.42 21,907 6.28 0.0007
2025-11-14 2025-09-30 13F KEROS THERAPEUTICS COM 492327101 1,302,978 -81,276 -5.87 20,613 11.55 0.0007
2025-08-14 2025-06-30 13F KEROS THERAPEUTICS COM 492327101 1,384,254 81,715 6.27 18,480 39.23 0.0007
2025-05-15 2025-03-31 13F KEROS THERAPEUTICS COM 492327101 1,302,539 99,156 8.24 13,273 -30.33 0.0005
2025-02-14 2024-12-31 13F KEROS THERAPEUTICS COM 492327101 1,203,383 89,793 8.06 19,050 -70.54 0.0008
2024-11-14 2024-09-30 13F KEROS THERAPEUTICS COM 492327101 1,113,590 -107,786 -8.82 64,666 15.86 0.0026
2024-08-14 2024-06-30 13F KEROS THERAPEUTICS COM 492327101 1,221,376 -341,519 -21.85 55,817 -46.05 0.0024
2024-05-15 2024-03-31 13F KEROS THERAPEUTICS COM 492327101 1,562,895 508,528 48.23 103,464 146.80 0.0046
2024-02-14 2023-12-31 13F KEROS THERAPEUTICS COM 492327101 1,054,367 152,367 16.89 41,922 45.79 0.0020
2023-11-14 2023-09-30 13F KEROS THERAPEUTICS COM 492327101 902,000 -113,903 -11.21 28,756 -29.55 0.0016
2023-08-14 2023-06-30 13F KEROS THERAPEUTICS COM 492327101 1,015,903 71,744 7.60 40,819 1.25 0.0021
2023-05-15 2023-03-31 13F KEROS THERAPEUTICS COM 492327101 944,159 -23,979 -2.48 40,316 -13.28 0.0023
2023-05-15 2022-12-31 13F/A-99 KEROS THERAPEUTICS COM 492327101 968,138 34,626 3.71 46,490 32.38 0.0027
2023-05-15 2022-12-31 13F KEROS THERAPEUTICS COM 492327101 968,138 34,626 46,490 0.0027
2022-11-15 2022-09-30 13F KEROS THERAPEUTICS COM 492327101 933,512 -57,240 -5.78 35,119 28.29 0.0022
2022-08-15 2022-06-30 13F KEROS THERAPEUTICS COM 492327101 990,752 307,105 44.92 27,374 -26.37 0.0016
2022-05-16 2022-03-31 13F KEROS THERAPEUTICS COM 492327101 683,647 28,655 4.37 37,177 -2.99 0.0018
2022-02-14 2021-12-31 13F KEROS THERAPEUTICS COM 492327101 654,992 -22,276 -3.29 38,324 43.04 0.0018
2021-11-15 2021-09-30 13F KEROS THERAPEUTICS COM 492327101 677,268 -1,710 -0.25 26,793 -7.08 0.0014
2021-08-16 2021-06-30 13F KEROS THERAPEUTICS COM 492327101 678,978 -44,845 -6.20 28,836 -35.27 0.0015
2021-07-09 2021-03-31 13F/A-1 KEROS THERAPEUTICS COM 492327101 723,823 297,732 69.88 44,551 48.23 0.0026
2021-05-17 2021-03-31 13F KEROS THERAPEUTICS COM 492327101 723,823 297,732 44,551 0.0026
2021-02-16 2020-12-31 13F KEROS THERAPEUTICS COM 492327101 426,091 326,865 329.41 30,056 685.37 0.0018
2020-11-10 2020-09-30 13F KEROS THERAPEUTICS COM 492327101 99,226 14,215 16.72 3,827 20.01 0.0003
2020-08-14 2020-06-30 13F KEROS THERAPEUTICS COM 492327101 85,011 85,011 3,189 0.0002
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.