INESE LOWENSTEIN - 22 May 2025 Form 4 Insider Report for RAPID MICRO BIOSYSTEMS, INC. (RPID)

Role: Director
Signature: /s/ Sean M. Wirtjes, Attorney-in-Fact for Inese Lowenstein
Issuer symbol: RPID
Transactions as of: 22 May 2025
Net transactions value: $0
Form type: 4
Filing time: 27 May 2025, 20:14:04 UTC
Previous filing: 28 May 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
LOWENSTEIN INESE	Director	C/O RAPID MICRO BIOSYSTEMS, INC., 25 HARTWELL AVENUE, LEXINGTON	/s/ Sean M. Wirtjes, Attorney-in-Fact for Inese Lowenstein	27 May 2025	0001900476

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RPID	Class A Common Stock	Award	$0	+14,300	+59%	$0.000000	38,600	22 May 2025	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	RPID	Stock Option (Right to Buy)	Award	$0	+28,650		$0.000000	28,650	22 May 2025	Class A Common Stock	28,650	$3.15	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Grant of restricted stock units ("RSUs") that vests in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the day immediately prior to the date of the next annual meeting of the stockholders of the Company provided that the Reporting Person remains in continuous service on such vesting date.
F2	The option shall vest and become exercisable in full on the earlier of (i) the first anniversary of the Grant Date, or (ii) the day immediately prior to the date of the next annual meeting of the stockholders of the Company provided that the Reporting Person remains in continuous service on such vesting date.