Rapid Micro Biosystems (RPID) director receives RSU and option grants

Rhea-AI Filing Summary

Rapid Micro Biosystems, Inc. director Richard S. Kollender reported equity awards under the company’s compensation program. He received 19,300 shares of Class A common stock as restricted stock units that were granted at no cash cost.

He was also granted stock options for 38,700 shares of Class A common stock at an exercise price of $2.07 per share, expiring on May 20, 2036. Both the RSUs and the options vest in full on the earlier of the first anniversary of the grant date or immediately before the next annual stockholders’ meeting, assuming continuous service. Following the RSU grant, he directly holds 130,318 shares of Class A common stock.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Kollender Richard S

Role null

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

Holdings After Transaction: Stock Option (Right to Buy) — 38,700 shares (Direct, null); Class A Common Stock — 130,318 shares (Direct, null)

Footnotes (1)

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. 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 size: 38,700 options Option exercise price: $2.07 per share +2 more

5 metrics

RSU grant 19,300 shares Restricted stock units of Class A common stock granted to director

Option grant size 38,700 options Stock options for Class A common stock granted to director

Option exercise price $2.07 per share Exercise price of granted stock options

Option expiration May 20, 2036 Expiration date of the granted stock options

Shares held after grant 130,318 shares Director’s direct Class A common stock holdings following RSU grant

Key Terms

restricted stock units ("RSUs"), Stock Option (Right to Buy), exercise price, Grant Date, +1 more

5 terms

restricted stock units ("RSUs") financial

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

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)","

exercise price financial

"conversion_or_exercise_price": "2.0700""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

Grant Date financial

"the first anniversary of the Grant Date, or (ii) the day immediately"

The grant date is the day a company formally gives an employee or contractor the right to receive stock-based compensation, such as stock options or restricted shares. It matters to investors because it fixes key terms—like the price, the start of the ownership clock, and when the award will affect the company’s financial statements and share count—so it can influence dilution, reported expenses, and potential future selling pressure.

annual meeting of the stockholders financial

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

Form 4 Insider Transactions: What Each Field Means →

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^*

Kollender Richard S

(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	130,318	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 Richard S. Kollender	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)

FAQ

What insider transaction did Rapid Micro Biosystems (RPID) report for Richard S. Kollender?

Rapid Micro Biosystems reported that director Richard S. Kollender received equity awards. The Form 4 shows a grant of restricted stock units and a separate grant of stock options, both as compensation rather than open-market purchases or sales.

How many Rapid Micro Biosystems (RPID) shares were granted to Richard Kollender as RSUs?

Richard S. Kollender was granted 19,300 shares of Class A common stock as restricted stock units. These RSUs vest in full on the earlier of the first anniversary of the grant date or immediately before the next annual stockholders’ meeting, subject to continuous service.

What stock options did Richard Kollender receive from Rapid Micro Biosystems (RPID)?

He received stock options covering 38,700 shares of Class A common stock. The options have an exercise price of $2.07 per share and expire on May 20, 2036, and they vest in full on the same schedule as the restricted stock units.

What is Richard Kollender’s Rapid Micro Biosystems (RPID) shareholding after this Form 4?

After the reported RSU grant, Richard S. Kollender directly holds 130,318 shares of Rapid Micro Biosystems Class A common stock. This figure reflects his position following the non-derivative acquisition reported in the Form 4 filing.

When do Richard Kollender’s Rapid Micro Biosystems (RPID) RSUs and options vest?

Both the RSUs and the options vest in full on the earlier of the first anniversary of the grant date or the day immediately before the next annual stockholders’ meeting, provided Richard S. Kollender remains in continuous service with the company until that vesting date.

Are Richard Kollender’s Rapid Micro Biosystems (RPID) transactions open-market buys or sales?

The transactions are compensation-related grants, not open-market trades. The Form 4 lists them as awards of restricted stock units and stock options, both with a transaction code indicating grant or other acquisition rather than a market purchase or sale.