RPID insider reports sales of 23,281 Class A shares

Sean M. Wirtjes reported sales of Class A shares and a planned sale tied to restricted stock vesting.

Accepted by SEC EDGAR 03/11/2026 - 03:15 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Sean M. Wirtjes reported sales of Class A shares and a planned sale tied to restricted stock vesting. The filing shows sale of 6,027 Class A shares on 02/09/2026 for $22,798.33 and 17,254 Class A shares on 02/20/2026 for $67,687.44. It also lists 7,480 Class A shares to be sold on 03/10/2026 related to Restricted Stock Vesting.

Insights

Corporate Governance Analyst

Insider transactions are routine sales around vesting dates and secondary market activity.

The filing documents two completed dispositions: 6,027 shares on 02/09/2026 and 17,254 shares on 02/20/2026, with dollar amounts shown as $22,798.33 and $67,687.44.

The excerpt also lists 7,480 shares associated with Restricted Stock Vesting on 03/10/2026; timing and cash‑flow details beyond the listed gross amounts are not provided in the excerpt.

Securities Compliance Counsel

Form 144 disclosures record intended and completed sales under Rule 144 mechanics.

The entry naming Fidelity Brokerage Services LLC suggests a broker relationship; the filing separately lists the selling person Sean M. Wirtjes and specific sale dates and amounts. The document ties the 03/10/2026 entry to compensation vesting.

Cash‑flow beneficiaries and any trading plan references are not shown in the provided excerpt; subsequent filings may disclose additional mechanics.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Sean M. Wirtjes report in the Form 144 for RPID?

He reported two completed sales and a planned sale tied to vesting of restricted stock. The filing lists 6,027 shares sold on 02/09/2026 and 17,254 shares sold on 02/20/2026, plus 7,480 shares to be sold on 03/10/2026.

How much gross value is shown for the reported sales in the RPID Form 144?

The filing shows gross amounts of $22,798.33 and $67,687.44 tied to two sales. Those dollar figures appear next to the 02/09/2026 and 02/20/2026 transactions in the excerpt.

Are the 7,480 Class A shares in the filing already sold for RPID?

No; the 7,480 Class A shares are listed as to be sold on 03/10/2026 and are tied to Restricted Stock Vesting. The excerpt treats that line as a planned sale rather than a completed disposition.

Does the Form 144 excerpt identify the broker used for these transactions?

Yes; the excerpt names Fidelity Brokerage Services LLC with an address in Smithfield, RI. The broker listing appears in the securities and filer information lines of the excerpt.

Does the filing disclose whether proceeds go to the issuer or the selling holder?

The excerpt does not state the proceeds recipient explicitly. The listed transactions are tied to the selling person Sean M. Wirtjes and a vesting event; cash‑flow treatment is not detailed in the provided lines.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001289733
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	RAPID MICRO BIOSYSTEMS, INC.
SEC File Number	001-40592
Address of Issuer	25 HARTWELL AVENUE LEXINGTON MASSACHUSETTS 02421
Phone	978-349-3200
Name of Person for Whose Account the Securities are To Be Sold	WIRTJES SEAN M
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	7480	32299.39	39823026	03/11/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A	03/10/2026	Restricted Stock Vesting	Issuer			7480	03/10/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Sean M. Wirtjes 25 Hartwell Avenue Lexington MA 02421	Class A	02/09/2026	6027	22798.33
Sean M. Wirtjes 25 Hartwell Avenue Lexington MA 02421	Class A	02/20/2026	17254	67687.44

144: Remarks and Signature

Remarks	Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.
Date of Notice	03/11/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Joshua Schmitt, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Sean M. Wirtjes.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)