Seth Alpna plan to sell securities of Keros Therapeutics, Inc. under Form 144

Seth Alpna filed Form 144 to notify SEC of plan to sell 2625 units of Keros Therapeutics, Inc. securities around 2026-06-04, with aggregate market value of $28,035.00. The total outstanding units is 19791837.0. The amount planned to be sold represents 0.01% of total outstanding units;