[Form 4] RAPID MICRO BIOSYSTEMS, INC. Insider Trading Activity

Rhea-AI Filing Summary

Rapid Micro Biosystems, Inc. (RPID) director Kirk Malloy reported a charitable gift of 40,000 shares of the company’s Class A common stock on 11/14/2025. The transaction was coded as a gift at a reported price of $0, reflecting that it was a non-sale transfer to a non-profit charitable organization.

After this transaction, Malloy beneficially owns 28,600 shares directly and an additional 10,000 shares indirectly through a family trust in which he shares investment power and where he and/or immediate family members are beneficiaries.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Malloy Kirk

(Last) (First) (Middle)

C/O RAPID MICRO BIOSYSTEMS, INC.

25 HARTWELL AVENUE

(Street)

LEXINGTON MA 02421

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
RAPID MICRO BIOSYSTEMS, INC. [ RPID ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
11/14/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	11/14/2025		G(1)		40,000	D	$0	28,600	D
Class A Common Stock								10,000	I	By Trust(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transaction reported involved a gift by the reporting person of shares of the Company's Class A Common Stock to a non-profit charitable organization.

2. Shares held in family trust as to which the Reporting Person shares investment power and the Reporting Person and/or immediate family members are beneficiaries.

Remarks:

	/s/ Sean M. Wirtjes, Attorney-in-Fact for Kirk Malloy	11/18/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did RPID director Kirk Malloy report?

Director Kirk Malloy reported a gift of 40,000 shares of Rapid Micro Biosystems’ Class A common stock on 11/14/2025 to a non-profit charitable organization.

How many RPID shares does Kirk Malloy own after the reported transaction?

Following the gift, Kirk Malloy beneficially owns 28,600 shares of Class A common stock directly and 10,000 shares indirectly through a family trust.

Was the RPID share transfer by the director a sale for value?

No. The transaction is coded as a gift with a reported price of $0, indicating a non-sale transfer to a charitable organization.

What is the relationship of the reporting person to Rapid Micro Biosystems (RPID)?

The reporting person, Kirk Malloy, is identified as a Director of Rapid Micro Biosystems, Inc.

How are the indirectly owned RPID shares held for Kirk Malloy?

The 10,000 indirectly owned shares are held in a family trust where he shares investment power and he and/or immediate family members are beneficiaries.

What type of security was involved in the RPID insider transaction?

The transaction involved Class A common stock of Rapid Micro Biosystems, Inc. (RPID).