RPID

Rapid Micro Biosystems, INC.

Insider trading activity for Rapid Micro Biosystems, INC., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Past 6 months

net buying

Bought(0 · 0 insiders): $0
Sold(0 · 0 insiders): $0

Past 12 months

-$1.1M

net selling

Bought(0 · 0 insiders): $0
Sold(14 · 4 insiders): $1.1M

Transaction history

The 87 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Jul 24	Kollender Richard S	Director	MEXER◆	1,827	—	—	—	Open the original filing on SEC.gov
Jul 24	Kollender Richard S	Director	MEXER◆	1,681	—	—	—	Open the original filing on SEC.gov
Jul 24	Kollender Richard S	Director	MEXER	1,827	$0.75	$1.4K	+1.4%	Open the original filing on SEC.gov
Jul 24	Kollender Richard S	Director	MEXER	1,681	$0.75	$1.3K	+1.3%	Open the original filing on SEC.gov
Jul 22	Spignesi Robert G. Jr.	President and CEO	MEXER◆	1,402	—	—	—	Open the original filing on SEC.gov
Jul 22	Spignesi Robert G. Jr.	President and CEO	MEXER	1,402	$0.75	$1.1K	+0.1%	Open the original filing on SEC.gov
May 29	Spignesi Robert G. Jr.	President and CEO	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Spignesi Robert G. Jr.	President and CEO	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Spignesi Robert G. Jr.	President and CEO	AGRANT	12,787	$1.96	$25K	+1.1%	Open the original filing on SEC.gov
May 29	Wirtjes Sean M	Chief Financial Officer	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Wirtjes Sean M	Chief Financial Officer	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Wirtjes Sean M	Chief Financial Officer	AGRANT	12,787	$1.96	$25K	+2.3%	Open the original filing on SEC.gov
May 29	Pei Melinda Litherland	Director	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Pei Melinda Litherland	Director	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Pei Melinda Litherland	Director	AGRANT	12,787	$1.96	$25K	+14.5%	Open the original filing on SEC.gov
May 29	Malloy Kirk	Director	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Malloy Kirk	Director	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Malloy Kirk	Director	AGRANT	12,787	$1.96	$25K	+26.7%	Open the original filing on SEC.gov
May 29	Lowenstein Inese	Director	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Lowenstein Inese	Director	AGRANT◆	12,787	—	—	—	Open the original filing on SEC.gov
May 29	Lowenstein Inese	Director	AGRANT	12,787	$1.96	$25K	+22.1%	Open the original filing on SEC.gov
May 21	Pei Melinda Litherland	Director	AGRANT◆	38,700	—	—	—	Open the original filing on SEC.gov
May 21	Pei Melinda Litherland	Director	AGRANT	19,300	—	—	+28.1%	Open the original filing on SEC.gov
May 21	Malloy Kirk	Director	AGRANT◆	38,700	—	—	—	Open the original filing on SEC.gov
May 21	Malloy Kirk	Director	AGRANT	19,300	—	—	+67.5%	Open the original filing on SEC.gov
May 21	Lowenstein Inese	Director	AGRANT◆	38,700	—	—	—	Open the original filing on SEC.gov
May 21	Lowenstein Inese	Director	AGRANT	19,300	—	—	+50.0%	Open the original filing on SEC.gov
May 21	Kollender Richard S	Director	AGRANT◆	38,700	—	—	—	Open the original filing on SEC.gov
May 21	Kollender Richard S	Director	AGRANT	19,300	—	—	+17.4%	Open the original filing on SEC.gov
May 21	Bika Dafni	Director	AGRANT◆	38,700	—	—	—	Open the original filing on SEC.gov
May 21	Bika Dafni	Director	AGRANT	19,300	—	—	—	Open the original filing on SEC.gov
May 20	Bain Capital Life…	10% Owner	PDBUY◆	1.5M	—	—	—	Open the original filing on SEC.gov
May 20	Bain Capital Life…	10% Owner	PDBUY◆	1.5M	—	—	—	Open the original filing on SEC.gov
May 20	Bain Capital Life…	10% Owner	PDBUY◆	1.5M	—	—	—	Open the original filing on SEC.gov
Mar 11	Wilson John J. Addington	Chief Operating Officer	SSELL	9,603	$4.32	$41.5K	-2.9%	Open the original filing on SEC.gov
Mar 11	Wirtjes Sean M	Chief Financial Officer	SSELL	7,480	$4.32	$32.3K	-1.3%	Open the original filing on SEC.gov
Mar 10	Spignesi Robert G. Jr.	President and CEO	SSELL	17,922	$4.11	$73.7K	-1.5%	Open the original filing on SEC.gov
Feb 27	Ricciardi Natale S	Director	MEXER◆	842	$0.75	$632	—	Open the original filing on SEC.gov
Feb 27	Ricciardi Natale S	Director	MEXER	842	$0.75	$632	+2.9%	Open the original filing on SEC.gov
Feb 20	Wilson John J. Addington	Chief Operating Officer	SSELL	5,403	$3.92	$21.2K	-1.6%	Open the original filing on SEC.gov
Feb 20	Wirtjes Sean M	Chief Financial Officer	SSELL	17,254	$3.92	$67.7K	-3.0%	Open the original filing on SEC.gov
Feb 19	Spignesi Robert G. Jr.	President and CEO	SSELL	38,327	$3.89	$148.9K	-3.1%	Open the original filing on SEC.gov
Feb 11	Wilson John J. Addington	Chief Operating Officer	AGRANT◆	147,000	—	—	—	Open the original filing on SEC.gov
Feb 11	Wilson John J. Addington	Chief Operating Officer	AGRANT	74,000	—	—	+28.7%	Open the original filing on SEC.gov
Feb 11	Wirtjes Sean M	Chief Financial Officer	AGRANT◆	193,000	—	—	—	Open the original filing on SEC.gov
Feb 11	Wirtjes Sean M	Chief Financial Officer	AGRANT	97,000	—	—	+20.0%	Open the original filing on SEC.gov
Feb 11	Spignesi Robert G. Jr.	President and CEO	AGRANT◆	528,000	—	—	—	Open the original filing on SEC.gov
Feb 11	Spignesi Robert G. Jr.	President and CEO	AGRANT	264,000	—	—	+27.4%	Open the original filing on SEC.gov
Feb 9	Wilson John J. Addington	Chief Operating Officer	SSELL	4,610	$3.78	$17.4K	-1.8%	Open the original filing on SEC.gov
Feb 9	Spignesi Robert G. Jr.	President and CEO	SSELL	12,840	$3.78	$48.6K	-1.3%	Open the original filing on SEC.gov
Feb 9	Wirtjes Sean M	Chief Financial Officer	SSELL	6,027	$3.78	$22.8K	-1.2%	Open the original filing on SEC.gov
Feb 4	Longitude Capital…	10% Owner	SSELL	49,000	$3.88	$190.1K	-100.0%	Open the original filing on SEC.gov
Feb 3	Longitude Capital…	10% Owner	SSELL	27,500	$4.24	$116.6K	-35.9%	Open the original filing on SEC.gov
Feb 2	Longitude Capital…	10% Owner	SSELL	27,500	$4.25	$116.8K	-26.4%	Open the original filing on SEC.gov
Jan 30	Longitude Capital…	10% Owner	SSELL	46,000	$4.54	$209K	-30.7%	Open the original filing on SEC.gov
Jan 23	Longitude Capital…	10% Owner	XXITM◆	129,032	—	—	—	Open the original filing on SEC.gov
Jan 23	Longitude Capital…	10% Owner	XXITM◆	500,000	—	—	—	Open the original filing on SEC.gov
Jan 23	Longitude Capital…	10% Owner	SSELL	7,739	$4.06	$31.5K	-0.2%	Open the original filing on SEC.gov
Jan 23	Longitude Capital…	10% Owner	XXITM	629,032	$0.05	$31.5K	+18.5%	Open the original filing on SEC.gov
Nov 14, 2025	Malloy Kirk	Director	GGIFT	40,000	—	—	-58.3%	Open the original filing on SEC.gov
Oct 17, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER◆	7,833	—	—	—	Open the original filing on SEC.gov
Oct 17, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER◆	3,400	—	—	—	Open the original filing on SEC.gov
Oct 17, 2025	Spignesi Robert G. Jr.	President and CEO	FTAX	4,774	$3.08	$14.7K	-0.5%	Open the original filing on SEC.gov
Oct 17, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER	7,833	$0.75	$5.9K	+0.8%	Open the original filing on SEC.gov
Oct 17, 2025	Spignesi Robert G. Jr.	President and CEO	FTAX	2,072	$3.08	$6.4K	-0.2%	Open the original filing on SEC.gov
Oct 17, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER	3,400	$0.75	$2.6K	+0.4%	Open the original filing on SEC.gov
Jul 14, 2025	Spignesi Robert G. Jr.	President and CEO	SSELL	11,881	$3.32	$39.5K	-1.2%	Open the original filing on SEC.gov
Jul 14, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER	25,145	—	—	+2.6%	Open the original filing on SEC.gov
Jul 11, 2025	Spignesi Robert G. Jr.	President and CEO	SSELL	11,874	$3.33	$39.5K	-1.2%	Open the original filing on SEC.gov
Jul 11, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER	25,145	—	—	+2.7%	Open the original filing on SEC.gov
Jul 10, 2025	Spignesi Robert G. Jr.	President and CEO	SSELL	11,617	$3.40	$39.5K	-1.2%	Open the original filing on SEC.gov
Jul 10, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER	25,145	—	—	+2.8%	Open the original filing on SEC.gov
Jul 9, 2025	Spignesi Robert G. Jr.	President and CEO	SSELL	11,247	$3.51	$39.5K	-1.2%	Open the original filing on SEC.gov
Jul 9, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER	25,144	—	—	+2.8%	Open the original filing on SEC.gov
Jul 8, 2025	Spignesi Robert G. Jr.	President and CEO	SSELL	10,824	$3.51	$38K	-1.2%	Open the original filing on SEC.gov
Jul 8, 2025	Spignesi Robert G. Jr.	President and CEO	MEXER	25,144	—	—	+2.9%	Open the original filing on SEC.gov
May 22, 2025	Ricciardi Natale S	Director	AGRANT◆	28,650	—	—	—	Open the original filing on SEC.gov
May 22, 2025	Ricciardi Natale S	Director	AGRANT	14,300	—	—	+100.0%	Open the original filing on SEC.gov
May 22, 2025	Pei Melinda Litherland	Director	AGRANT◆	28,650	—	—	—	Open the original filing on SEC.gov
May 22, 2025	Pei Melinda Litherland	Director	AGRANT	14,300	—	—	+26.3%	Open the original filing on SEC.gov
May 22, 2025	Malloy Kirk	Director	AGRANT◆	28,650	—	—	—	Open the original filing on SEC.gov
May 22, 2025	Malloy Kirk	Director	AGRANT	14,300	—	—	+22.2%	Open the original filing on SEC.gov
May 22, 2025	Lowenstein Inese	Director	AGRANT◆	28,650	—	—	—	Open the original filing on SEC.gov
May 22, 2025	Lowenstein Inese	Director	AGRANT	14,300	—	—	+58.9%	Open the original filing on SEC.gov
May 22, 2025	Kollender Richard S	Director	AGRANT◆	28,650	—	—	—	Open the original filing on SEC.gov
May 22, 2025	Kollender Richard S	Director	AGRANT	14,300	—	—	+14.8%	Open the original filing on SEC.gov
May 22, 2025	Bika Dafni	Director	AGRANT◆	50,000	—	—	—	Open the original filing on SEC.gov

MEXER◆—

Kollender Richard S · DirectorJul 24

1,827 sh

MEXER◆—

Kollender Richard S · DirectorJul 24

1,681 sh

MEXER$1.4K

Kollender Richard S · DirectorJul 24

1,827 sh @ $0.75 · +1.4% own

MEXER$1.3K

Kollender Richard S · DirectorJul 24

1,681 sh @ $0.75 · +1.3% own

MEXER◆—

Spignesi Robert G. Jr. · President and CEOJul 22

1,402 sh

MEXER$1.1K

Spignesi Robert G. Jr. · President and CEOJul 22

1,402 sh @ $0.75 · +0.1% own

AGRANT◆—

Spignesi Robert G. Jr. · President and CEOMay 29

12,787 sh

AGRANT◆—

Spignesi Robert G. Jr. · President and CEOMay 29

12,787 sh

AGRANT$25K

Spignesi Robert G. Jr. · President and CEOMay 29

12,787 sh @ $1.96 · +1.1% own

AGRANT◆—

Wirtjes Sean M · Chief Financial…May 29

12,787 sh

AGRANT◆—

Wirtjes Sean M · Chief Financial…May 29

12,787 sh

AGRANT$25K

Wirtjes Sean M · Chief Financial…May 29

12,787 sh @ $1.96 · +2.3% own

AGRANT◆—

Pei Melinda Litherland · DirectorMay 29

12,787 sh

AGRANT◆—

Pei Melinda Litherland · DirectorMay 29

12,787 sh

AGRANT$25K

Pei Melinda Litherland · DirectorMay 29

12,787 sh @ $1.96 · +14.5% own

AGRANT◆—

Malloy Kirk · DirectorMay 29

12,787 sh

AGRANT◆—

Malloy Kirk · DirectorMay 29

12,787 sh

AGRANT$25K

Malloy Kirk · DirectorMay 29

12,787 sh @ $1.96 · +26.7% own

AGRANT◆—

Lowenstein Inese · DirectorMay 29

12,787 sh

AGRANT◆—

Lowenstein Inese · DirectorMay 29

12,787 sh

AGRANT$25K

Lowenstein Inese · DirectorMay 29

12,787 sh @ $1.96 · +22.1% own

AGRANT◆—

Pei Melinda Litherland · DirectorMay 21

38,700 sh

AGRANT—

Pei Melinda Litherland · DirectorMay 21

19,300 sh · +28.1% own

AGRANT◆—

Malloy Kirk · DirectorMay 21

38,700 sh

AGRANT—

Malloy Kirk · DirectorMay 21

19,300 sh · +67.5% own

AGRANT◆—

Lowenstein Inese · DirectorMay 21

38,700 sh

AGRANT—

Lowenstein Inese · DirectorMay 21

19,300 sh · +50.0% own

AGRANT◆—

Kollender Richard S · DirectorMay 21

38,700 sh

AGRANT—

Kollender Richard S · DirectorMay 21

19,300 sh · +17.4% own

AGRANT◆—

Bika Dafni · DirectorMay 21

38,700 sh

AGRANT—

Bika Dafni · DirectorMay 21

19,300 sh

PDBUY◆—

Bain Capital Life… · 10% OwnerMay 20

1.5M sh

PDBUY◆—

Bain Capital Life… · 10% OwnerMay 20

1.5M sh

PDBUY◆—

Bain Capital Life… · 10% OwnerMay 20

1.5M sh

SSELL$41.5K

Wilson John J. Addington · Chief Operating…Mar 11

9,603 sh @ $4.32 · -2.9% own

SSELL$32.3K

Wirtjes Sean M · Chief Financial…Mar 11

7,480 sh @ $4.32 · -1.3% own

SSELL$73.7K

Spignesi Robert G. Jr. · President and CEOMar 10

17,922 sh @ $4.11 · -1.5% own

MEXER◆$632

Ricciardi Natale S · DirectorFeb 27

842 sh @ $0.75

MEXER$632

Ricciardi Natale S · DirectorFeb 27

842 sh @ $0.75 · +2.9% own

SSELL$21.2K

Wilson John J. Addington · Chief Operating…Feb 20

5,403 sh @ $3.92 · -1.6% own

SSELL$67.7K

Wirtjes Sean M · Chief Financial…Feb 20

17,254 sh @ $3.92 · -3.0% own

SSELL$148.9K

Spignesi Robert G. Jr. · President and CEOFeb 19

38,327 sh @ $3.89 · -3.1% own

AGRANT◆—

Wilson John J. Addington · Chief Operating…Feb 11

147,000 sh

AGRANT—

Wilson John J. Addington · Chief Operating…Feb 11

74,000 sh · +28.7% own

AGRANT◆—

Wirtjes Sean M · Chief Financial…Feb 11

193,000 sh

AGRANT—

Wirtjes Sean M · Chief Financial…Feb 11

97,000 sh · +20.0% own

AGRANT◆—

Spignesi Robert G. Jr. · President and CEOFeb 11

528,000 sh

AGRANT—

Spignesi Robert G. Jr. · President and CEOFeb 11

264,000 sh · +27.4% own

SSELL$17.4K

Wilson John J. Addington · Chief Operating…Feb 9

4,610 sh @ $3.78 · -1.8% own

SSELL$48.6K

Spignesi Robert G. Jr. · President and CEOFeb 9

12,840 sh @ $3.78 · -1.3% own

SSELL$22.8K

Wirtjes Sean M · Chief Financial…Feb 9

6,027 sh @ $3.78 · -1.2% own

SSELL$190.1K

Longitude Capital… · 10% OwnerFeb 4

49,000 sh @ $3.88 · -100.0% own

SSELL$116.6K

Longitude Capital… · 10% OwnerFeb 3

27,500 sh @ $4.24 · -35.9% own

SSELL$116.8K

Longitude Capital… · 10% OwnerFeb 2

27,500 sh @ $4.25 · -26.4% own

SSELL$209K

Longitude Capital… · 10% OwnerJan 30

46,000 sh @ $4.54 · -30.7% own

XXITM◆—

Longitude Capital… · 10% OwnerJan 23

129,032 sh

XXITM◆—

Longitude Capital… · 10% OwnerJan 23

500,000 sh

SSELL$31.5K

Longitude Capital… · 10% OwnerJan 23

7,739 sh @ $4.06 · -0.2% own

XXITM$31.5K

Longitude Capital… · 10% OwnerJan 23

629,032 sh @ $0.05 · +18.5% own

GGIFT—

Malloy Kirk · DirectorNov 14, 2025

40,000 sh · -58.3% own

MEXER◆—

Spignesi Robert G. Jr. · President and CEOOct 17, 2025

7,833 sh

MEXER◆—

Spignesi Robert G. Jr. · President and CEOOct 17, 2025

3,400 sh

FTAX$14.7K

Spignesi Robert G. Jr. · President and CEOOct 17, 2025

4,774 sh @ $3.08 · -0.5% own

MEXER$5.9K

Spignesi Robert G. Jr. · President and CEOOct 17, 2025

7,833 sh @ $0.75 · +0.8% own

FTAX$6.4K

Spignesi Robert G. Jr. · President and CEOOct 17, 2025

2,072 sh @ $3.08 · -0.2% own

MEXER$2.6K

Spignesi Robert G. Jr. · President and CEOOct 17, 2025

3,400 sh @ $0.75 · +0.4% own

SSELL$39.5K

Spignesi Robert G. Jr. · President and CEOJul 14, 2025

11,881 sh @ $3.32 · -1.2% own

MEXER—

Spignesi Robert G. Jr. · President and CEOJul 14, 2025

25,145 sh · +2.6% own

SSELL$39.5K

Spignesi Robert G. Jr. · President and CEOJul 11, 2025

11,874 sh @ $3.33 · -1.2% own

MEXER—

Spignesi Robert G. Jr. · President and CEOJul 11, 2025

25,145 sh · +2.7% own

SSELL$39.5K

Spignesi Robert G. Jr. · President and CEOJul 10, 2025

11,617 sh @ $3.40 · -1.2% own

MEXER—

Spignesi Robert G. Jr. · President and CEOJul 10, 2025

25,145 sh · +2.8% own

SSELL$39.5K

Spignesi Robert G. Jr. · President and CEOJul 9, 2025

11,247 sh @ $3.51 · -1.2% own

MEXER—

Spignesi Robert G. Jr. · President and CEOJul 9, 2025

25,144 sh · +2.8% own

SSELL$38K

Spignesi Robert G. Jr. · President and CEOJul 8, 2025

10,824 sh @ $3.51 · -1.2% own

MEXER—

Spignesi Robert G. Jr. · President and CEOJul 8, 2025

25,144 sh · +2.9% own

AGRANT◆—

Ricciardi Natale S · DirectorMay 22, 2025

28,650 sh

AGRANT—

Ricciardi Natale S · DirectorMay 22, 2025

14,300 sh · +100.0% own

AGRANT◆—

Pei Melinda Litherland · DirectorMay 22, 2025

28,650 sh

AGRANT—

Pei Melinda Litherland · DirectorMay 22, 2025

14,300 sh · +26.3% own

AGRANT◆—

Malloy Kirk · DirectorMay 22, 2025

28,650 sh

AGRANT—

Malloy Kirk · DirectorMay 22, 2025

14,300 sh · +22.2% own

AGRANT◆—

Lowenstein Inese · DirectorMay 22, 2025

28,650 sh

AGRANT—

Lowenstein Inese · DirectorMay 22, 2025

14,300 sh · +58.9% own

AGRANT◆—

Kollender Richard S · DirectorMay 22, 2025

28,650 sh

AGRANT—

Kollender Richard S · DirectorMay 22, 2025

14,300 sh · +14.8% own

AGRANT◆—

Bika Dafni · DirectorMay 22, 2025

50,000 sh

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

1 of 35 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 4 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
Jan 23	Feb 2	Enright Patrick G +410% Owner	4days	$209K	Filing ↗

Enright Patrick G +410% Owner

4days

Traded Jan 23 · filed Feb 2Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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