Robert G. Spignesi Jr. - 17 Oct 2025 Form 4 Insider Report for RAPID MICRO BIOSYSTEMS, INC. (RPID)

Role
PRESIDENT AND CEO, Director
Signature
/s/ Sean M. Wirtjes, Attorney-in-Fact for Robert G. Spignesi, Jr.
Issuer symbol
RPID
Transactions as of
17 Oct 2025
Net transactions value
-$12,661
Form type
4
Filing time
21 Oct 2025, 17:46:26 UTC
Previous filing
15 Jul 2025
Next filing
10 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Spignesi Robert G. Jr. PRESIDENT AND CEO, Director C/O RAPID MICRO BIOSYSTEMS, INC., 25 HARTWELL AVENUE, LEXINGTON /s/ Sean M. Wirtjes, Attorney-in-Fact for Robert G. Spignesi, Jr. 21 Oct 2025 0001853904

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction RPID Class A Common Stock Options Exercise $2,550 +3,400 +0.35% $0.7500 973,950 17 Oct 2025 Direct
transaction RPID Class A Common Stock Tax liability $6,382 -2,072 -0.21% $3.08 971,878 17 Oct 2025 Direct F1
transaction RPID Class A Common Stock Options Exercise $5,875 +7,833 +0.81% $0.7500 979,711 17 Oct 2025 Direct
transaction RPID Class A Common Stock Tax liability $14,704 -4,774 -0.49% $3.08 974,937 17 Oct 2025 Direct F2

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) Options Exercise $0 -3,400 -100% $0.000000 0 17 Oct 2025 Class A Common Stock 3,400 $0.7500 Direct F3
transaction RPID Stock Option (Right to Buy) Options Exercise $0 -7,833 -100% $0.000000 0 17 Oct 2025 Class A Common Stock 7,833 $0.7500 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents a "net exercise" of outstanding stock options. The reporting person received 1,328 shares of common stock on net exercise of option to purchase 3,400 shares of common stock. The Company withheld 2,072 shares of common stock underlying the option for payment of the exercise price and tax withholdings, using the closing stock price on October 17, 2025 of $3.08, pursuant to the terms of the 2010 Stock Option and Grant Plan.
F2 Represents a "net exercise" of outstanding stock options. The reporting person received 3,059 shares of common stock on net exercise of option to purchase 7,833 shares of common stock. The Company withheld 4,774 shares of common stock underlying the option for payment of the exercise price and tax withholdings, using the closing stock price on October 17, 2025 of $3.08, pursuant to the terms of the 2010 Stock Option and Grant Plan.
F3 The option is fully vested and exercisable.