RAPID MICRO BIOSYSTEMS INC

(c)Director and Officer Trading Plans and Arrangements

None of our directors or officers adopted, modified orterminated a Rule 10b5-1 trading arrangement, oradopted, modified orterminated a non-Rule 10b5-1 trading arrangement (as defined in Item 408(c) of Regulation S-K) during the quarter ended March 31, 2025.

In addition, our officers (as defined in Rule 16a-1(f) under the Exchange Act) have entered into sell-to-cover arrangements authorizing the pre-arranged sale of shares to satisfy tax withholding obligations of the Company arising exclusively from the vesting of shares of restricted stock and time-vesting or performance-vesting restricted stock units and the related issuance of shares. The amount of shares to be sold to satisfy the Company’s tax withholding obligations under these arrangements is dependent on future events which cannot be known at this time, including the future trading price of Company shares. The expiration date relating to these arrangements is dependent on future events which cannot be known at this time, including the final vest date of the applicable shares of restricted stock and time-vesting or performance-vesting restricted stock units and the officer’s termination of service.