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person · Reporting owner

Spignesi Robert G. Jr.

Disclosed activity across 1 company

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28800
SEC CIK
0001853904

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Reported relationships

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CompanyLast reported asReport datePublished
RAPID MICRO BIOSYSTEMS, INC.RPID · Entity 6966Director · PRESIDENT AND CEOJuly 22, 2026July 24, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

RAPID MICRO BIOSYSTEMS, INC.

Report date July 22, 2026 · Filed July 24, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Class A Common StockSEC Table I · non-derivativeDirect1,191,973 Reported balance After 2026-07-22 transaction · row 1
1 source row

Row 1 · 2026-07-22 · Exercise / conversion · Acquired 1,402 · Balance 1,191,973

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $0.75 · Expires 2026-08-11Direct0 Reported balance After 2026-07-22 transaction · row 2 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 2 · 2026-07-22 · Exercise / conversion · Disposed 1,402 · Balance 0

F1: The option is fully vested and exercisable.

Filing footnotes · ownership attribution and instrument terms

F1: The option is fully vested and exercisable.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
July 22, 2026 Filed Jul 24, 2026 22:29 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionStock Option (Right to Buy) · Derivative 1,402 $0.00 Strike: $0.75 $0.00
Disclosure

SEC source: 0001853904-26-000020 · wk-form4_1784932183.xml · derivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 1,402 shares

Expires 2026-08-11

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
July 22, 2026 Filed Jul 24, 2026 22:29 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 1,402 $0.75 $1,051.50
Disclosure

SEC source: 0001853904-26-000020 · wk-form4_1784932183.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,191,973

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
May 29, 2026 Filed Jun 2, 2026 23:40 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantSeries B Warrant (right to buy) · Derivative 12,787 $0.00 Strike: $2.34 $0.00
Disclosure

SEC source: 0001853904-26-000017 · wk-form4_1780443598.xml · derivative · entry 3

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,787

Underlying: Class A Common Stock · 12,787 shares

Expires 2031-05-29

F1 · kind: On May 29, 2026, the Reporting Person purchased, in a registered direct offering, 12,787 shares of the Issuer's Class A Common Stock, as well as an accompanying Series A Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof) and an accompanying Series B Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof). The purchase price of each share of Issuer Class A Common Stock and accompanying Series A and Series B Warrant was $1.955. The issuance of such securities was approved by the Issuer's compensation committee of the board of directors in accordance with Rule 16(b)-3 of the Securities Exchange Act of 1934, as amended.

F1 · price: On May 29, 2026, the Reporting Person purchased, in a registered direct offering, 12,787 shares of the Issuer's Class A Common Stock, as well as an accompanying Series A Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof) and an accompanying Series B Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof). The purchase price of each share of Issuer Class A Common Stock and accompanying Series A and Series B Warrant was $1.955. The issuance of such securities was approved by the Issuer's compensation committee of the board of directors in accordance with Rule 16(b)-3 of the Securities Exchange Act of 1934, as amended.

F3 · derivative.exercise_date: The Series A and Series B Warrants cannot be exercised for shares of the Issuer's Class A Common Stock if, as a result of such exercise, the holder, together with its affiliates and any other persons whose beneficial ownership would be aggregated for purposes of Section 13(d) of the Act, would beneficially own more than 9.99% of the total number of shares of the Issuer's Class A Common Stock then outstanding immediately following such exercise.

Read SEC document
May 29, 2026 Filed Jun 2, 2026 23:40 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantSeries A Warrant (right to buy) · Derivative 12,787 $0.00 Strike: $1.96 $0.00
Disclosure

SEC source: 0001853904-26-000017 · wk-form4_1780443598.xml · derivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,787

Underlying: Class A Common Stock · 12,787 shares

Expires 2027-05-29

F1 · kind: On May 29, 2026, the Reporting Person purchased, in a registered direct offering, 12,787 shares of the Issuer's Class A Common Stock, as well as an accompanying Series A Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof) and an accompanying Series B Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof). The purchase price of each share of Issuer Class A Common Stock and accompanying Series A and Series B Warrant was $1.955. The issuance of such securities was approved by the Issuer's compensation committee of the board of directors in accordance with Rule 16(b)-3 of the Securities Exchange Act of 1934, as amended.

F1 · price: On May 29, 2026, the Reporting Person purchased, in a registered direct offering, 12,787 shares of the Issuer's Class A Common Stock, as well as an accompanying Series A Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof) and an accompanying Series B Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof). The purchase price of each share of Issuer Class A Common Stock and accompanying Series A and Series B Warrant was $1.955. The issuance of such securities was approved by the Issuer's compensation committee of the board of directors in accordance with Rule 16(b)-3 of the Securities Exchange Act of 1934, as amended.

F3 · derivative.exercise_date: The Series A and Series B Warrants cannot be exercised for shares of the Issuer's Class A Common Stock if, as a result of such exercise, the holder, together with its affiliates and any other persons whose beneficial ownership would be aggregated for purposes of Section 13(d) of the Act, would beneficially own more than 9.99% of the total number of shares of the Issuer's Class A Common Stock then outstanding immediately following such exercise.

Read SEC document
May 29, 2026 Filed Jun 2, 2026 23:40 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantClass A Common Stock 12,787 $1.96 $24,998.59
Disclosure

SEC source: 0001853904-26-000017 · wk-form4_1780443598.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,190,571

F1 · kind: On May 29, 2026, the Reporting Person purchased, in a registered direct offering, 12,787 shares of the Issuer's Class A Common Stock, as well as an accompanying Series A Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof) and an accompanying Series B Warrant to purchase 12,787 shares of the Issuer's Class A Common Stock (or pre-funded warrants in lieu thereof). The purchase price of each share of Issuer Class A Common Stock and accompanying Series A and Series B Warrant was $1.955. The issuance of such securities was approved by the Issuer's compensation committee of the board of directors in accordance with Rule 16(b)-3 of the Securities Exchange Act of 1934, as amended.

F2 · balance_after: Includes 7,936 shares acquired under the Rapid Micro Biosystems, Inc. employee stock purchase plan on March 13, 2026.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 23:52 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 17,922 $4.11 $73,686.30
Disclosure

SEC source: 0001853904-26-000013 · wk-form4_1773359540.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,169,848

F1 · shares: Represents the automatic sale of stock to cover the associated tax obligations with the vesting of restricted stock units.

Read SEC document
February 19, 2026 Filed Feb 21, 2026 00:17 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 38,327 $3.89 $148,911.89
Disclosure

SEC source: 0001853904-26-000010 · wk-form4_1771633029.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,187,770

F1 · shares: Represents the automatic sale of stock to cover the associated tax obligations with the vesting of restricted stock units.

Read SEC document
February 11, 2026 Filed Feb 14, 2026 00:33 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantStock Option (Right to Buy) · Derivative 528,000 $0.00 Strike: $4.20 $0.00
Disclosure

SEC source: 0001380106-26-000013 · wk-form4_1771029199.xml · derivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 528,000

Underlying: Class A Common Stock · 528,000 shares

Expires 2036-02-10

F2 · derivative.exercise_date: The option vests and becomes exercisable in 48 substantially equal monthly installments with the first installment vesting on March 11, 2026.

Read SEC document
February 11, 2026 Filed Feb 14, 2026 00:33 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantClass A Common Stock 264,000 $0.00 $0.00
Disclosure

SEC source: 0001380106-26-000013 · wk-form4_1771029199.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,226,097

F1 · shares: Grant of restricted stock units ("RSUs") that vest in three annual installments with 33.4% vesting on the first anniversary of February 11, 2026 (the "grant date") and 33.3% vesting on each of the second and third anniversaries of the grant date provided that the Reporting Person remains in continuous service on each vesting date.

Read SEC document
February 09, 2026 Filed Feb 10, 2026 23:52 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 12,840 $3.78 $48,569.87
Disclosure

SEC source: 0001853904-26-000004 · wk-form4_1770767569.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 962,097

F1 · shares: Represents the automatic sale of stock to cover the associated tax obligations with the vesting of restricted stock units.

Read SEC document
October 17, 2025 Filed Oct 21, 2025 21:46 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionStock Option (Right to Buy) · Derivative 7,833 $0.00 Strike: $0.75 $0.00
Disclosure

SEC source: 0001380106-25-000190 · wk-form4_1761083184.xml · derivative · entry 6

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 7,833 shares

Expires 2025-10-22

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
October 17, 2025 Filed Oct 21, 2025 21:46 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionStock Option (Right to Buy) · Derivative 3,400 $0.00 Strike: $0.75 $0.00
Disclosure

SEC source: 0001380106-25-000190 · wk-form4_1761083184.xml · derivative · entry 5

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,400 shares

Expires 2025-10-22

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: The option is fully vested and exercisable.

Read SEC document
October 17, 2025 Filed Oct 21, 2025 21:46 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 4,774 $3.08 $14,703.92
Disclosure

SEC source: 0001380106-25-000190 · wk-form4_1761083184.xml · nonDerivative · entry 4

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 974,937

F2 · shares: 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.

Read SEC document
October 17, 2025 Filed Oct 21, 2025 21:46 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 7,833 $0.75 $5,874.75
Disclosure

SEC source: 0001380106-25-000190 · wk-form4_1761083184.xml · nonDerivative · entry 3

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 979,711

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
October 17, 2025 Filed Oct 21, 2025 21:46 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 2,072 $3.08 $6,381.76
Disclosure

SEC source: 0001380106-25-000190 · wk-form4_1761083184.xml · nonDerivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 971,878

F1 · shares: 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.

Read SEC document
October 17, 2025 Filed Oct 21, 2025 21:46 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 3,400 $0.75 $2,550.00
Disclosure

SEC source: 0001380106-25-000190 · wk-form4_1761083184.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 973,950

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
July 14, 2025 Filed Jul 15, 2025 20:37 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 11,881 $3.32 $39,480.56
Disclosure

SEC source: 0001380106-25-000162 · wk-form4_1752611829.xml · nonDerivative · entry 4

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 970,550

F2 · shares: The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of performance restricted stock units.

Read SEC document
July 14, 2025 Filed Jul 15, 2025 20:37 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 25,145 $0.00 $0.00
Disclosure

SEC source: 0001380106-25-000162 · wk-form4_1752611829.xml · nonDerivative · entry 3

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 982,431

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares were acquired upon satisfaction of performance criteria underlying previously granted performance restricted stock units.

Read SEC document
July 11, 2025 Filed Jul 15, 2025 20:37 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 11,874 $3.33 $39,498.86
Disclosure

SEC source: 0001380106-25-000162 · wk-form4_1752611829.xml · nonDerivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 957,286

F2 · shares: The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of performance restricted stock units.

Read SEC document
July 11, 2025 Filed Jul 15, 2025 20:37 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 25,145 $0.00 $0.00
Disclosure

SEC source: 0001380106-25-000162 · wk-form4_1752611829.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 969,160

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares were acquired upon satisfaction of performance criteria underlying previously granted performance restricted stock units.

Read SEC document
July 10, 2025 Filed Jul 10, 2025 23:43 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 11,617 $3.40 $39,474.57
Disclosure

SEC source: 0001380106-25-000157 · wk-form4_1752190995.xml · nonDerivative · entry 6

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 944,015

F2 · shares: The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of performance restricted stock units.

F3 · balance_after: Includes 29,904 shares acquired under the Rapid Micro Biosystems, Inc. employee stock purchase plan on March 14, 2025.

Read SEC document
July 10, 2025 Filed Jul 10, 2025 23:43 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 25,145 $0.00 $0.00
Disclosure

SEC source: 0001380106-25-000157 · wk-form4_1752190995.xml · nonDerivative · entry 5

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 925,728

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares were acquired upon satisfaction of performance criteria underlying previously granted performance restricted stock units.

Read SEC document
July 09, 2025 Filed Jul 10, 2025 23:43 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 11,247 $3.51 $39,480.34
Disclosure

SEC source: 0001380106-25-000157 · wk-form4_1752190995.xml · nonDerivative · entry 4

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 900,583

F2 · shares: The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of performance restricted stock units.

Read SEC document
July 09, 2025 Filed Jul 10, 2025 23:43 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 25,144 $0.00 $0.00
Disclosure

SEC source: 0001380106-25-000157 · wk-form4_1752190995.xml · nonDerivative · entry 3

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 911,830

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares were acquired upon satisfaction of performance criteria underlying previously granted performance restricted stock units.

Read SEC document
July 08, 2025 Filed Jul 10, 2025 23:43 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 SaleClass A Common Stock 10,824 $3.51 $38,021.46
Disclosure

SEC source: 0001380106-25-000157 · wk-form4_1752190995.xml · nonDerivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 886,686

F2 · shares: The sales reported on this Form 4 represent shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting and settlement of performance restricted stock units.

Read SEC document
July 08, 2025 Filed Jul 10, 2025 23:43 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Exercise / conversionClass A Common Stock 25,144 $0.00 $0.00
Disclosure

SEC source: 0001380106-25-000157 · wk-form4_1752190995.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 897,510

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Shares were acquired upon satisfaction of performance criteria underlying previously granted performance restricted stock units.

Read SEC document
March 09, 2025 Filed Mar 11, 2025 23:19 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 10,650 $2.39 $25,453.50
Disclosure

SEC source: 0001380106-25-000075 · wk-form4_1741735172.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 872,366

F1 · shares: Represents the withholding of shares received upon the vesting of restricted stock units to cover the associated tax obligation.

Read SEC document
February 18, 2025 Filed Feb 20, 2025 23:58 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantStock Option (Right to Buy) · Derivative 290,000 $0.00 Strike: $3.90 $0.00
Disclosure

SEC source: 0001380106-25-000036 · wk-form4_1740095891.xml · derivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 290,000

Underlying: Class A Common Stock · 290,000 shares

Expires 2035-02-17

F3 · derivative.exercise_date: The option vests and becomes exercisable in 48 substantially equal monthly installments with the first installment vesting on March 18, 2025.

Read SEC document
February 18, 2025 Filed Feb 20, 2025 23:58 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantClass A Common Stock 365,000 $0.00 $0.00
Disclosure

SEC source: 0001380106-25-000036 · wk-form4_1740095891.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 883,016

F1 · shares: Grant of restricted stock units ("RSUs") that vest in three annual installments with 33.4% vesting on the first anniversary of February 18, 2025 (the "grant date") and 33.3% vesting on each of the second and third anniversaries of the grant date provided that the Reporting Person remains in continuous service on each vesting date.

F2 · balance_after: The amount reported under Item 5. reflects a correction due to immaterial errors in previously reported withholding amounts.

Read SEC document
February 11, 2025 Filed Feb 14, 2025 01:01 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 10,755 $2.68 $28,823.40
Disclosure

SEC source: 0001380106-25-000027 · wk-form4_1739494856.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 516,205

F1 · shares: Represents the withholding of shares received upon the vesting of restricted stock units to cover the associated tax obligations.

Read SEC document
February 06, 2025 Filed Feb 8, 2025 01:11 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 13,052 $3.10 $40,461.20
Disclosure

SEC source: 0001380106-25-000021 · wk-form4_1738977079.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 526,960

F1 · shares: Represents the withholding of shares received upon the vesting of restricted stock units to cover the associated tax obligations.

Read SEC document
August 06, 2024 Filed Aug 7, 2024 20:31 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 50,000 $0.77 $38,400.00
Disclosure

SEC source: 0001380106-24-000173 · wk-form4_1723062694.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 540,012

F1 · balance_after: Includes 21,188 shares acquired under the Rapid Micro Biosystems, Inc. employee stock purchase plan on March 14, 2024.

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March 11, 2024 Filed Mar 13, 2024 01:18 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 10,323 $0.98 $10,126.86
Disclosure

SEC source: 0001380106-24-000082 · wk-form4_1710292725.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 468,824

F1 · shares: Represents the withholding of shares received upon the vesting of restricted stock units to cover the associated tax obligations.

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February 12, 2024 Filed Feb 14, 2024 22:23 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 9,365 $0.96 $8,990.40
Disclosure

SEC source: 0001380106-24-000042 · wk-form4_1707949407.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 479,147

F1 · shares: Represents the withholding of shares received upon the vesting of restricted stock units to cover the associated tax obligations.

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February 06, 2024 Filed Feb 8, 2024 22:01 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantStock Option (Right to Buy) · Derivative 225,000 $0.00 Strike: $0.94 $0.00
Disclosure

SEC source: 0001380106-24-000027 · wk-form4_1707429692.xml · derivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 225,000

Underlying: Class A Common Stock · 225,000 shares

Expires 2034-02-05

F2 · derivative.exercise_date: The option vests and becomes exercisable in 48 substantially equal monthly installments with the first installment vesting on March 6, 2024.

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February 06, 2024 Filed Feb 8, 2024 22:01 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantClass A Common Stock 113,000 $0.00 $0.00
Disclosure

SEC source: 0001380106-24-000027 · wk-form4_1707429692.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 488,512

F1 · shares: Grant of restricted stock units ("RSUs") that vest in three annual installments with 33.4% vesting on the first anniversary of February 6, 2024 (the "grant date") and 33.3% vesting on each of the second and third anniversaries of the grant date provided that the Reporting Person remains in continuous service on each vesting date.

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August 15, 2023 Filed Aug 16, 2023 23:13 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 20,000 $0.97 $19,488.00
Disclosure

SEC source: 0001380106-23-000154 · wf-form4_169222757955521.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 375,512

F1 · price: The reported price in Column 4 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $0.920 to $1.000 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

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August 08, 2023 Filed Aug 10, 2023 20:15 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 34,000 $0.92 $31,446.60
Disclosure

SEC source: 0001380106-23-000151 · wf-form4_169169853177850.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 355,512

F1 · shares: The reported price in Column 4 is a weighted average purchase price. These shares were purchased in multiple transactions at prices ranging from $0.09038 to $0.94000 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 300 $0.93 $279.00
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 9

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 321,512

F1 · balance_after: Includes 6,739 shares acquired under the Rapid Micro Biosystems, Inc. employee stock purchase plan on March 14, 2023.

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 100 $0.93 $92.50
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 8

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 314,473

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 100 $0.92 $92.40
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 7

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 314,373

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 100 $0.92 $92.30
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 6

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 314,273

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 1,400 $0.92 $1,288.00
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 5

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 314,173

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 14,700 $0.91 $13,377.00
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 4

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 312,773

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 3,000 $0.91 $2,715.00
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 3

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 298,073

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May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 100 $0.90 $90.10
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 295,073

Read SEC document
May 17, 2023 Filed May 18, 2023 20:12 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 PurchaseClass A Common Stock 200 $0.89 $178.00
Disclosure

SEC source: 0001380106-23-000121 · wf-form4_168444073277211.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 294,973

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March 09, 2023 Filed Mar 14, 2023 01:29 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantStock Option (Right to Buy) · Derivative 217,700 $0.00 Strike: $1.24 $0.00
Disclosure

SEC source: 0001853904-23-000002 · wf-form4_167875738403056.xml · derivative · entry 2

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 217,700

Underlying: Class A Common Stock · 217,700 shares

Expires 2033-03-08

F2 · derivative.exercise_date: The option vests and becomes exercisable in 48 substantially equal monthly installments with the first installment vesting on April 9, 2023.

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March 09, 2023 Filed Mar 14, 2023 01:29 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 GrantClass A Common Stock 108,850 $0.00 $0.00
Disclosure

SEC source: 0001853904-23-000002 · wf-form4_167875738403056.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · PRESIDENT AND CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 294,773

F1 · shares: Grant of restricted stock units ("RSUs") that vest in three annual installments with 33.4% vesting on the first anniversary of March 9, 2023 (the "grant date") and 33.3% vesting on each of the second and third anniversaries of the grant date provided that the Reporting Person remains in continuous service on each vesting date.

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February 13, 2023 Filed Feb 16, 2023 02:48 UTC RAPID MICRO BIOSYSTEMS, INC. RPID · Entity 6966 Tax withholdingClass A Common Stock 11,406 $1.30 $14,827.80
Disclosure

SEC source: 0001127602-23-005435 · form4.xml · nonDerivative · entry 1

Spignesi Robert G. Jr. · CIK 0001853904 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 185,923

F1 · shares: Represents the withholding of shares received upon the vesting of restricted stock units to cover the associated tax obligations.

F2 · balance_after: Includes 3,302 shares acquired under the Rapid Micro Biosystems, Inc. employee stock purchase plan on September 14, 2022.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.