Rapid Micro director granted stock and options

RAPID MICRO BIOSYSTEMS, INC. director Melinda Litherland received equity-based compensation consisting of restricted stock units and stock options.

Accepted by SEC EDGAR 05/26/2026 - 07:25 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

RAPID MICRO BIOSYSTEMS, INC. director Melinda Litherland received equity-based compensation consisting of restricted stock units and stock options.

She was granted 19,300 shares of Class A Common Stock as restricted stock units that vest in full on the earlier of the first anniversary of the grant date or the day immediately before the next annual stockholder meeting, if she remains in continuous service.

She was also granted options on 38,700 shares of Class A Common Stock at an exercise price of $2.07 per share, which vest on the same schedule and expire on May 20, 2036. Following these grants, she directly owns 87,900 shares of Class A Common Stock.

Insider Trade Summary

Grant/Award: 58,000 shares

Grant/Award 2 txns

Insider PEI MELINDA LITHERLAND

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	38,700	$0.00	$0.00
Grant/Award	Class A Common Stock	19,300	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 38,700 contracts (Direct); Class A Common Stock — 87,900 shares (Direct)

Footnotes (2)

1. 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.
2. 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.

Key Figures

RSU grant: 19,300 shares Option grant underlying shares: 38,700 shares Option exercise price: $2.07/share +2 more

5 metrics

RSU grant 19,300 shares Restricted stock units vesting by first anniversary or before next annual meeting

Option grant underlying shares 38,700 shares Stock Option (Right to Buy) on Class A Common Stock

Option exercise price $2.07/share Conversion or exercise price for stock option grant

Shares owned after grant 87,900 shares Total Class A Common Stock directly owned following reported transactions

Option expiration date May 20, 2036 Expiration date of stock option grant

Key Terms

restricted stock units ("RSUs"), Stock Option (Right to Buy), continuous service, annual meeting of the stockholders

4 terms

restricted stock units ("RSUs") financial

"Grant of restricted stock units ("RSUs") that vests in full on the earlier of"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

Stock Option (Right to Buy) financial

"security_title": "Stock Option (Right to Buy)""

continuous service financial

"provided that the Reporting Person remains in continuous service on such vesting date"

annual meeting of the stockholders financial

"immediately prior to the date of the next annual meeting of the stockholders of the Company"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did RPID director Melinda Litherland report?

Melinda Litherland reported receiving equity compensation, not open-market trades. She was granted 19,300 restricted stock units and stock options on 38,700 shares, both tied to Class A Common Stock, as part of her role with Rapid Micro Biosystems (RPID).

How many RPID shares does Melinda Litherland hold after these grants?

After the equity awards, Melinda Litherland directly holds 87,900 shares of Class A Common Stock. This figure reflects her updated ownership position in Rapid Micro Biosystems (RPID) following the grant of 19,300 restricted stock units reported in the Form 4 filing.

What are the key terms of Melinda Litherland’s RPID stock option grant?

Her stock option grant covers 38,700 shares of Class A Common Stock at an exercise price of $2.07 per share and expires on May 20, 2036. The option vests in full based on a service-based schedule tied to time and the next annual meeting.

When do Melinda Litherland’s RPID restricted stock units vest?

The 19,300 restricted stock units vest in full on the earlier of the first anniversary of the grant date or the day immediately before the next annual meeting. Vesting requires that she remain in continuous service with Rapid Micro Biosystems (RPID) through that vesting date.

Are Melinda Litherland’s RPID grants open-market purchases or compensation awards?

These transactions are compensation-related awards, not open-market purchases. The Form 4 uses transaction code “A” for both the restricted stock units and stock options, indicating grants or awards provided by Rapid Micro Biosystems (RPID) as part of her director compensation package.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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
Estimated average burden
hours per response:			0.5

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^*

PEI MELINDA LITHERLAND

(Last) (First) (Middle)

C/O RAPID MICRO BIOSYSTEMS, INC.

25 HARTWELL AVENUE

(Street)

LEXINGTON MASSACHUSETTS 02421

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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

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

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

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	05/21/2026		A		19,300(1)	A	$0	87,900	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
Stock Option (Right to Buy)	$2.07	05/21/2026		A		38,700		(2)	05/20/2036	Class A Common Stock	38,700	$0	38,700	D

Explanation of Responses:

1. 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.

2. 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.

Remarks:

	/s/ Robert Spignesi, Attorney-in-Fact for Melinda Litherland Pei	05/26/2026
	** 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).
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.
* Form 4: SEC 1474 (03-26)