Rapid Micro Biosystems, Inc. Insider Trading

RPID

Last 12 months

Insiders sold 474K and bought nothing on the open market.

None of the selling was scheduled in advance under a 10b5-1 plan. The last open-market buy by an executive or director was in Dec 2024.

Net open-market

−474K

0 buys · 9 sales

Under a 10b5-1 plan

of the value sold

Insiders who bought / sold

0 / 3

executives and directors

Last open-market buy

Dec 2024

Dec 5, 2024

Get an email when RPID's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Mar 11	John J. Addington Wilson Chief Operating Officer	SoldNo plan	9,603	$4.32	41K	2.9%	Form 4
Mar 11	Sean M Wirtjes Chief Financial Officer	SoldNo plan	7,480	$4.32	32K	1.3%	Form 4
Mar 10	Robert G. Spignesi Jr. President and CEO	SoldNo plan	17,922	$4.11	74K	1.5%	Form 4
Feb 20	John J. Addington Wilson Chief Operating Officer	SoldNo plan	5,403	$3.92	21K	1.6%	Form 4
Feb 20	Sean M Wirtjes Chief Financial Officer	SoldNo plan	17,254	$3.92	68K	3.0%	Form 4
Feb 19	Robert G. Spignesi Jr. President and CEO	SoldNo plan	38,327	$3.89	149K	3.1%	Form 4
Feb 9	John J. Addington Wilson Chief Operating Officer	SoldNo plan	4,610	$3.78	17K	1.8%	Form 4
Feb 9	Robert G. Spignesi Jr. President and CEO	SoldNo plan	12,840	$3.78	49K	1.3%	Form 4
Feb 9	Sean M Wirtjes Chief Financial Officer	SoldNo plan	6,027	$3.78	23K	1.2%	Form 4
Feb 4	Longitude Venture Partners II, L.p. Large holder	SoldNo plan	49,000	$3.88	190K	1.2%	Form 4
Jan 23 – Feb 3	Longitude Prime Partners, LLC Large holder	SoldNo plan 4 parts	108,739	$4.36 average	474K	2.6%	Form 4
Jul 11, 2025 – Jul 14, 2025	Robert G. Spignesi Jr. President and CEO	SoldNo plan 2 parts	23,755	$3.32 average	79K	2.4%	Form 4
Jul 8, 2025 – Jul 10, 2025	Robert G. Spignesi Jr. President and CEO	SoldNo plan 3 parts	33,688	$3.47 average	117K	3.4%	Form 4
Dec 3, 2024 – Dec 5, 2024	Melinda Litherland Pei Director	Bought 2 parts	20,000	$1.02 average	20K	58%	Form 4
Nov 26, 2024 – Nov 27, 2024	Melinda Litherland Pei Director	Bought 2 parts	20,000	$1.05 average	21K	140%	Form 4

Mar 11No plan
John J. Addington Wilson
Chief Operating Officer · sold 9,603 at $4.32
41K
2.9% of stake
Mar 11No plan
Sean M Wirtjes
Chief Financial Officer · sold 7,480 at $4.32
32K
1.3% of stake
Mar 10No plan
Robert G. Spignesi Jr.
President and CEO · sold 17,922 at $4.11
74K
1.5% of stake
Feb 20No plan
John J. Addington Wilson
Chief Operating Officer · sold 5,403 at $3.92
21K
1.6% of stake
Feb 20No plan
Sean M Wirtjes
Chief Financial Officer · sold 17,254 at $3.92
68K
3.0% of stake
Feb 19No plan
Robert G. Spignesi Jr.
President and CEO · sold 38,327 at $3.89
149K
3.1% of stake
Feb 9No plan
John J. Addington Wilson
Chief Operating Officer · sold 4,610 at $3.78
17K
1.8% of stake
Feb 9No plan
Robert G. Spignesi Jr.
President and CEO · sold 12,840 at $3.78
49K
1.3% of stake
Feb 9No plan
Sean M Wirtjes
Chief Financial Officer · sold 6,027 at $3.78
23K
1.2% of stake
Feb 4No plan
Longitude Venture Partners II, L.p.
Large holder · sold 49,000 at $3.88
190K
1.2% of stake
Jan 23 – Feb 3No plan
Longitude Prime Partners, LLC
Large holder · sold 108,739 at avg $4.36
474K
2.6% of stake
Jul 11, 2025 – Jul 14, 2025No plan
Robert G. Spignesi Jr.
President and CEO · sold 23,755 at avg $3.32
79K
2.4% of stake
Jul 8, 2025 – Jul 10, 2025No plan
Robert G. Spignesi Jr.
President and CEO · sold 33,688 at avg $3.47
117K
3.4% of stake
Dec 3, 2024 – Dec 5, 2024
Melinda Litherland Pei
Director · bought 20,000 at avg $1.02
20K
58% of stake
Nov 26, 2024 – Nov 27, 2024
Melinda Litherland Pei
Director · bought 20,000 at avg $1.05
21K
140% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch RPID, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in RPID's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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