Company: RPID
Filing Date: 2025-04-08
Form Type: DEF 14A
Source: 0001380106-25-000089
Chunk: 4

Company: RAPID MICRO BIOSYSTEMS, INC.
Filing Date: 2025-04-08
Form: DEF 14A
Chunk 4
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5 and enter the information requested on the screen to register as a guest. Please note that you will not have the ability to vote or ask questions during the meeting if you participate as a guest.

This proxy statement, form of proxy card and the Company’s 2024 Annual Report to stockholders for the fiscal year ended December 31, 2024 (the “2024 Annual Report”) were first made available to stockholders on or about April 8, 2025 to our Class A stockholders as of the Record Date.

In this proxy statement, “we,” “us,” “our,” the “Company” and “Rapid Micro Biosystems” refer to Rapid Micro Biosystems, Inc., and, unless otherwise stated, all of its subsidiaries.

<div align='center'>1</div>

#### TABLE OF CONTENTS

### IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS
<div align='center'>FOR THE 2025 ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON THURSDAY, MAY 22, 2025</div>

#### This Proxy Statement and our 2024 Annual Report,
<div align='center'>which includes our Annual Report on Form 10-K for the fiscal year ended December 31, 2024,</div>

#### are available at http://www.proxyvote.com/
<div align='center'>and at investors.rapidmicrobio.com under the tab “Financial Information”</div>

#### for viewing, downloading and printing.
A copy of our Annual Report on Form 10-K for the year ended December 31, 2024 as filed with the Securities and Exchange Commission (the "SEC"), except for exhibits, will be furnished without charge to any stockholder upon written or oral request to Rapid Micro Biosystems, Inc., 25 Hartwell Avenue, Lexington, Massachusetts 02421, Attention: Investor Relations, Telephone 1-978-349-3200.

To attend, vote and submit questions during the Annual Meeting visit www.virtualshareholdermeeting.com/RPID2025 and enter the control number included in your Notice of Internet Availability, voting instruction form, or proxy card. Stockholders may vote during the Annual Meeting by following the instructions available on the Annual Meeting website. Those without a control number may attend as guests of the meeting but will not have the option to vote or ask questions during the virtual meeting. Online access to the webcast will open approximately 15 minutes prior to the start of the Annual Meeting. To submit questions