INSM insider plans sale of 7,982 common shares

Insmed (INSM) insider Martina Flammer has filed a Form 144 indicating an intention to sell 7,982 shares of the company’s common stock.

Accepted by SEC EDGAR 02/02/2026 - 05:30 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Insmed (INSM) insider Martina Flammer has filed a Form 144 indicating an intention to sell 7,982 shares of the company’s common stock. The planned sale, through Merrill Lynch in Washington, D.C., has an aggregate market value of 1,233,964 and is listed for execution on 02/02/2026 on the NASDAQ.

The shares were acquired on 02/02/2026 via stock plan activity from the issuer. The notice also shows prior sales over the past three months, including 31,226 common shares sold on 11/11/2025 for gross proceeds of 5,921,820.

FAQ

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

How many Insmed (INSM) shares is Martina Flammer planning to sell under this Form 144?

Martina Flammer plans to sell 7,982 Insmed common shares. The filing lists these shares with an aggregate market value of 1,233,964, to be sold through Merrill Lynch on NASDAQ with an approximate sale date of 02/02/2026.

What is the aggregate market value of the Insmed (INSM) shares to be sold?

The aggregate market value of the 7,982 shares is 1,233,964. This value is reported in the securities information section, alongside details of the broker, class of securities, and the approximate sale date of 02/02/2026 on the NASDAQ exchange.

How were the Insmed (INSM) shares in this Form 144 acquired?

The 7,982 Insmed common shares were acquired through stock plan activity. The filing states they were obtained from the issuer on 02/02/2026, with the nature of the acquisition described as “Stock Plan Activity” and the payment date also shown as 02/02/2026.

Which broker will handle Martina Flammer’s planned sale of Insmed (INSM) shares?

The sale will be handled by Merrill Lynch. The broker’s address is listed as 1800 K ST NW, Suite 800, Washington, DC 20006, and the transaction is designated for execution on the NASDAQ stock exchange.

What Insmed (INSM) share sales has Martina Flammer made in the past three months?

The filing lists several prior sales of Insmed common shares. Examples include 31,226 shares sold on 11/11/2025 for gross proceeds of 5,921,820 and 12,303 shares sold on 01/05/2026 for gross proceeds of 2,108,459.

How many Insmed (INSM) shares are reported as outstanding in this Form 144?

The filing reports 213,273,469 Insmed common shares outstanding. This figure appears in the securities information table alongside the number of shares to be sold, their aggregate market value, and the planned NASDAQ sale date of 02/02/2026.

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	7982	1233964	213273469	02/02/2026	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	02/02/2026	Stock Plan Activity	Issuer			7982	02/02/2026	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	01/09/2026	1887	351332
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/08/2026	4911	854817
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/07/2026	1434	252154
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	02/02/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/27/2025
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)