RPID SEC Filing News — Rapid Micro Biosystems, Inc.

Latest SEC filings for Rapid Micro Biosystems, Inc. (RPID) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-08-07.

Rapid Micro Biosystems, Inc., a life sciences technology company, provides products for the detection of microbial contamination in the manufacture of pharmaceutical, biologics, medical devices, and personal care products in the United States, Switzerland, Germany, Japan, and internationally. The company offers Growth Direct platform, which includes growth direct system, proprietary consumables, lab information management system connection software, and customer support and validation services. …
Sector: Healthcare Industry: Medical Devices Market Cap: $38.8M
12
Total Filings
0
Bullish Classifications
0
Bearish Classifications
6
Insider Transactions
1
Material Events (8-K)
1
Periodic Reports
What you're looking at: Each item below is parsed from an actual SEC filing submitted by Rapid Micro Biosystems, Inc.. Form 4 = confirmed insider transaction · Form 144 = proposed sale notice · 8-K = material event (earnings, M&A, leadership change, etc.) · 10-Q / 10-K = quarterly / annual report.
RPID Filing Activity Snapshot 2026-06-02 — 2026-08-07
Insider Transactions (Form 4)
0 buys vs 0 sells
Insider buying and selling activity is balanced in this period.
Largest Form 144 Filing
$17.0K
Wilson John J. Addington · 2026-07-08
10,000 shares · Form 144
Form 144 Notices
4
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 6 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 6 filings in this group are Form 4s for Rapid Micro Biosystems, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 6 insider filings shown, the breakdown is 4 compensation award and 2 option exercise. None of the classified filings involved a discretionary open-market trade, so this period says nothing about what insiders think of the price.

What each transaction type means

Compensation award ×4
Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Option exercise ×2
The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.
Form 4 Option exercise Tax / Compensation Filing 2026-07-24

RPID insider Form 4 filed for equity award, exercise, or tax withholding

Kollender Richard S (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 1,681 $0.75 $1.3K
M Option exercise 1,827 $0.75 $1.4K
M Option exercise derivative · Stock Option (Right to Buy) 1,681 — —
M Option exercise derivative · Stock Option (Right to Buy) 1,827 — —
Filing: Form 4 (Insider Transaction) Insider: Kollender Richard S (Director) Shares: 3,508
View on SEC EDGAR → Open Filing Document →
Form 4 Option exercise Tax / Compensation Filing 2026-07-24

RPID insider Form 4 filed for equity award, exercise, or tax withholding

Spignesi Robert G. Jr. (Director, PRESIDENT AND CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 1,402 $0.75 $1.1K
M Option exercise derivative · Stock Option (Right to Buy) 1,402 — —
Filing: Form 4 (Insider Transaction) Insider: Spignesi Robert G. Jr. (Director, PRESIDENT AND CEO) Shares: 1,402
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-02

RPID insider Form 4 filed for equity award, exercise, or tax withholding

LOWENSTEIN INESE (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 12,787 $1.96 $25.0K
A Compensation award derivative · Series A Warrant (right to buy) 12,787 — —
A Compensation award derivative · Series B Warrant (right to buy) 12,787 — —
Filing: Form 4 (Insider Transaction) Insider: LOWENSTEIN INESE (Director) Shares: 12,787
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-02

RPID insider Form 4 filed for equity award, exercise, or tax withholding

PEI MELINDA LITHERLAND (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 12,787 $1.96 $25.0K
A Compensation award derivative · Series A Warrant (right to buy) 12,787 — —
A Compensation award derivative · Series B Warrant (right to buy) 12,787 — —
Filing: Form 4 (Insider Transaction) Insider: PEI MELINDA LITHERLAND (Director) Shares: 12,787
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-02

RPID insider Form 4 filed for equity award, exercise, or tax withholding

Malloy Kirk (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 12,787 $1.96 $25.0K
A Compensation award derivative · Series A Warrant (right to buy) 12,787 — —
A Compensation award derivative · Series B Warrant (right to buy) 12,787 — —
Filing: Form 4 (Insider Transaction) Insider: Malloy Kirk (Director) Shares: 12,787
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-06-02

RPID insider Form 4 filed for equity award, exercise, or tax withholding

WIRTJES SEAN M (CHIEF FINANCIAL OFFICER) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 12,787 $1.96 $25.0K
A Compensation award derivative · Series A Warrant (right to buy) 12,787 — —
A Compensation award derivative · Series B Warrant (right to buy) 12,787 — —
Filing: Form 4 (Insider Transaction) Insider: WIRTJES SEAN M (CHIEF FINANCIAL OFFICER) Shares: 12,787
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 4 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Rapid Micro Biosystems, Inc. has 4 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-07-08

RPID Form 144 filed for proposed insider sale by Wilson John J. Addington (10,000 shares) ~$17.0K

Wilson John J. Addington filed a Form 144 with the SEC indicating intent to sell RPID (RAPID MICRO BIOSYSTEMS, INC.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Wilson John J. Addington Shares: 10,000 Est. Value: $17.0K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-07-01

RPID Form 144 filed for proposed insider sale by Wilson John J. Addington (6,312 shares) ~$11.0K

Wilson John J. Addington filed a Form 144 with the SEC indicating intent to sell RPID (RAPID MICRO BIOSYSTEMS, INC.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Wilson John J. Addington Shares: 6,312 Est. Value: $11.0K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-06-22

RPID Form 144 filed for proposed insider sale by Wilson John J. Addington (3,688 shares) ~$6.5K

Wilson John J. Addington filed a Form 144 with the SEC indicating intent to sell RPID (RAPID MICRO BIOSYSTEMS, INC.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Wilson John J. Addington Shares: 3,688 Est. Value: $6.5K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-06-10

RPID Form 144 filed for proposed insider sale by Wilson John J. Addington (5,000 shares) ~$9.3K

Wilson John J. Addington filed a Form 144 with the SEC indicating intent to sell RPID (RAPID MICRO BIOSYSTEMS, INC.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Wilson John J. Addington Shares: 5,000 Est. Value: $9.3K
View on SEC EDGAR → Open Filing Document →
Material Events 1 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There is 1 in this period for Rapid Micro Biosystems, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-07

RPID filed 8-K — material company event

RAPID MICRO BIOSYSTEMS, INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for Rapid Micro Biosystems, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-07

RPID filed Quarterly Report (10-Q)

RAPID MICRO BIOSYSTEMS, INC. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →

How we classify Rapid Micro Biosystems, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on RPID. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — RPID SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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