INSM: Notice to Sell 7,854 Common Shares

INSM submitted a Form 144 notice listing 7,854 shares of Common Stock to be sold on 05/11/2026 under stock plan activity.

Rhea-AI Filing Summary

INSM submitted a Form 144 notice listing 7,854 shares of Common Stock to be sold on 05/11/2026 under stock plan activity. The filing also records that Martina Flammer sold 12,949 shares on 05/11/2026.

Key Figures

Shares listed to be sold: 7,854 shares Shares sold (past 3 months): 12,949 shares Form type: Form 144 +1 more

4 metrics

Shares listed to be sold 7,854 shares listed for sale on 05/11/2026 under stock plan activity

Shares sold (past 3 months) 12,949 shares sold by Martina Flammer on 05/11/2026

Form type Form 144 notice of proposed sale under Rule 144

Trading venue NASDAQ exchange listed in the filing lines

Key Terms

Form 144, Rule 144, Stock plan activity

3 terms

Form 144 regulatory

"Securities Sold During The Past 3 Months Martina Flammer"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Rule 144 regulatory

"Securities To Be Sold Common ... Stock plan activity"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Stock plan activity financial

"Securities To Be Sold Common | 05/11/2026 | Stock plan activity"

FAQ

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

What does INSM's Form 144 filing mean?

Form 144 is a notice of a proposed sale of restricted or control securities under Rule 144. This filing lists 7,854 shares proposed for sale on 05/11/2026 and records recent activity by a holder.

Who is the selling individual in the INSM filing?

The filing identifies Martina Flammer at the listed address and shows she sold 12,949 shares on 05/11/2026. The Form 144 supplies the seller name and the transaction date.

How many shares does the Form 144 list for sale for INSM?

The document lists 7,854 shares of Common Stock to be sold on 05/11/2026 under stock plan activity. The filing pairs that planned sale with the noted past transaction.

Does the filing state who receives proceeds from the sale?

The excerpt indicates the sale is related to stock plan activity and lists the issuer as the party in that line. Cash‑flow treatment or detailed use of proceeds is not specified in the provided lines.

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

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Accepted by SEC EDGAR 05/13/2026 - 05:17 PM EDT Learn about SEC filing dates

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	0001796960
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	INSMED INCORPORATED
SEC File Number	000-30739
Address of Issuer	700 US Highway 202/206 Bridgewater NEW JERSEY 08807
Phone	9089779900
Name of Person for Whose Account the Securities are To Be Sold	Martina Flammer
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
Common	Merrill Lynch 1800 K St NW Suite 800 Washington DC 20006	7854	897145	216752451	05/13/2026	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 *
Common	05/11/2026	Stock plan activity	Issuer			7854	05/11/2026	n/a

* 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
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/11/2026	12949	1300105

144: Remarks and Signature

Remarks
Date of Notice	05/13/2026
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	Martina Flammer
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)