|Issuer:||KALEIDO BIOSCIENCES, INC. (KLDO)|
|Original Submission Date:|
C/O KALEIDO BIOSCIENCES, INC.
65 HAYDEN AVENUE LEXINGTON, MA 02421
|Title of Security||Transaction Date||2a. Deemed Execution Date||Transaction Code||Shares||Acquired or Disposed||Price per share||5. Amount of Securities Beneficially Owned Following Reported Transaction||6. Ownership Form Direct or Indirect||Nature of Indirect Ownership|
|Title of Derivative Security||Conversion or Exercise Price of Derivative Security||Transaction Date||Deemed Execution Date||Transaction Code||Number of Derivative Securities Acquired (A) or Disposed of (D)||Date Exercisable||Expiration Date||Title and Amount of Securities Underlying Derivative Security||Price of Derivative Security||Number of derivative Securities Beneficially Owned Following Reported Transaction(s)||Ownership Form: Direct (D) or Indirect (I)||Nature of Indirect Beneficial Ownership|
|STOCK OPTION (RIGHT TO BUY)||6.29||2021-09-01||deemed execution date||A||100,000 (a)||2031-08-31||common stock 100,000||$6.29||100,000||direct|
|f1||25% of this option shall vest on september 1, 2022, with the remainder vesting in 12 equal quarterly installments thereafter.|