Company: RPID
Filing Date: 2025-04-08
Form Type: DEF 14A
Source: 0001380106-25-000089
Chunk: 0

Company: RAPID MICRO BIOSYSTEMS, INC.
Filing Date: 2025-04-08
Form: DEF 14A
Chunk 0
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TABLE OF CONTENTS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

| Filed by the Registrant |     | x |     | Filed by a Party other than the Registrant |     | o |

| Check the appropriate box: |     |                                                                                 |
| o                          |     | Preliminary Proxy Statement                                                     |
| o                          |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| x                          |     | Definitive Proxy Statement                                                      |
| o                          |     | Definitive Additional Materials                                                 |
| o                          |     | Soliciting Material under §240.14a-12                                           |

| Rapid Micro Biosystems, Inc.                                             |
| (Name of Registrant as Specified in its Charter)                         |
| (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant) |

| Payment of Filing Fee (Check all boxes that apply): |     |                                                                                                      |
| x                                                   |     | No fee required.                                                                                     |
| o                                                   |     | Fee paid previously with preliminary materials.                                                      |
| o                                                   |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |

TABLE OF CONTENTS Rapid Micro Biosystems, Inc.

NOTICE & PROXY STATEMENT

2025 Annual Meeting of Stockholders To be Held on Thursday, May 22, 2025 9:00 a.m. Eastern Time

#### TABLE OF CONTENTS

#### RAPID MICRO BIOSYSTEMS, INC.

#### 25 HARTWELL AVENUE

#### LEXINGTON, MASSACHUSETTS 02421
April 8, 2025

Dear Fellow Stockholders:

You are cordially invited to attend the 2025 Annual Meeting of Stockholders (“Annual Meeting”) of Rapid Micro Biosystems, Inc. (the “Company”), which will be conducted virtually via live webcast on Thursday, May 22, 2025, beginning at 9:00 a.m. Eastern Time. You will be able to attend the virtual Annual Meeting, vote your shares electronically and submit your questions during the Annual Meeting by visiting www.virtualshareholdermeeting.com/RPID2025.