COO of Rapid Micro Biosystems (RPID) auto-sells shares to cover RSU taxes

Rhea-AI Filing Summary

RAPID MICRO BIOSYSTEMS, INC. chief operating officer John J. Wilson reported an automatic sale of 5,403 shares of Class A common stock at $3.923 per share. According to the footnote, this sale was made solely to cover tax obligations tied to vesting restricted stock units. After the transaction, he directly held 326,365 shares of Class A common stock.

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

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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^*

Wilson John J. Addington

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/20/2026

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	02/20/2026		S		5,403(1)	D	$3.923	326,365	D

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. Represents the automatic sale of stock to cover the associated tax obligations with the vesting of restricted stock units.

Remarks:

	/s/ Sean M. Wirtjes, Attorney-in-Fact for John J. Addington Wilson	02/20/2026
	** 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).
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FAQ

What insider transaction did RPID COO John J. Wilson report on this Form 4?

He reported an automatic sale of 5,403 shares of Rapid Micro Biosystems Class A common stock at $3.923 per share. The sale was executed to cover tax obligations arising from the vesting of restricted stock units.

Was the RPID insider stock sale by the COO a discretionary open-market trade?

The filing describes the transaction as a sale, but the footnote clarifies it was an automatic sale. It was executed specifically to cover tax obligations associated with vesting restricted stock units, rather than a discretionary open-market liquidation of holdings.

How many Rapid Micro Biosystems shares does the COO hold after this reported sale?

Following the reported transaction, the COO directly holds 326,365 shares of Rapid Micro Biosystems Class A common stock. This figure reflects his ownership after the 5,403-share automatic sale to satisfy tax obligations on vested restricted stock units.

What price per share was received in the RPID COO’s reported stock sale?

The reported sale was executed at a price of $3.923 per share for Rapid Micro Biosystems Class A common stock. This price applies to the 5,403 shares sold to cover tax obligations from the vesting of restricted stock units.

Does the Form 4 indicate the RPID COO is still a significant shareholder after the sale?

The Form 4 shows that after the transaction, the COO continues to directly own 326,365 shares of Class A common stock. This suggests he retains a substantial equity stake despite the tax-related sale of 5,403 shares.