Insmed insider plans sale of 1,434 shares

Insmed investor Martina Flammer filed a Form 144 notice indicating an intention to sell 1,434 shares of common stock through Merrill Lynch on the NASDAQ, with an aggregate market value of 252154.

Accepted by SEC EDGAR 01/07/2026 - 04:42 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Insmed investor Martina Flammer filed a Form 144 notice indicating an intention to sell 1,434 shares of common stock through Merrill Lynch on the NASDAQ, with an aggregate market value of 252154. The shares to be sold were acquired on 01/05/2026 through stock plan activity with the issuer.

As context, the same seller reported prior sales of Insmed common stock over the past three months, including 10,185 shares on 01/06/2026 for gross proceeds of 1770153 and 12,303 shares on 01/05/2026 for gross proceeds of 2108459. Additional sales were disclosed on 12/01/2025 and 11/11/2025. The filing also notes that the issuer had 213,273,469 shares of common stock outstanding.

FAQ

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

What does the Insmed (INSM) Form 144 filing disclose?

The Form 144 discloses that investor Martina Flammer intends to sell 1,434 shares of Insmed common stock through Merrill Lynch on the NASDAQ, with an aggregate market value of 252154.

How many Insmed (INSM) shares is the insider planning to sell?

The notice states that 1,434 shares of Insmed common stock are planned for sale, with an aggregate market value of 252154.

When and how were the Insmed (INSM) shares to be sold acquired?

The shares to be sold are common stock acquired on 01/05/2026 via stock plan activity from the issuer, with the amount acquired listed as 1,434 shares.

What recent Insmed (INSM) share sales has the same seller reported?

The filing lists prior sales by Martina Flammer over the past three months, including 10,185 shares on 01/06/2026 for gross proceeds of 1770153 and 12,303 shares on 01/05/2026 for gross proceeds of 2108459, plus additional transactions on 12/01/2025 and 11/11/2025.

How many Insmed (INSM) shares are outstanding according to this notice?

The securities information section reports that 213,273,469 shares of Insmed common stock were outstanding.

Which broker and exchange are involved in the planned Insmed (INSM) share sale?

The planned sale of 1,434 Insmed common shares is indicated to be through Merrill Lynch, with the securities to be sold on the NASDAQ stock exchange.

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	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 INC
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	1434	252154	213273469	01/07/2026	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	01/05/2026	Stock Plan Activity	Issuer			1434	01/05/2026	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	01/06/2026	10185	1770153
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/05/2026	12303	2108459
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	12/01/2025	8895	1840841
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	11/11/2025	31226	5921820

144: Remarks and Signature

Remarks
Date of Notice	01/07/2026
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)