Insider plans sale of 1,660 INSM shares

A shareholder associated with symbol INSM has filed a Form 144 indicating an intention to sell 1,660 shares of common stock through Merrill Lynch on or about 01/08/2026 on the NASDAQ market.

Accepted by SEC EDGAR 01/08/2026 - 05:28 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

A shareholder associated with symbol INSM has filed a Form 144 indicating an intention to sell 1,660 shares of common stock through Merrill Lynch on or about 01/08/2026 on the NASDAQ market. The filing notes that 213,273,469 shares of this class of stock were outstanding at the time.

The 1,660 shares to be sold were acquired on 01/06/2026 through stock plan activity from the issuer. The filer, Martina Flammer, also reported several recent sales in the past three months, including 31,226 shares sold on 11/11/2025 for gross proceeds of 5,921,820 and other transactions such as 12,303 shares on 01/05/2026 for gross proceeds of 2,108,459. The signer represents that they are not aware of undisclosed material adverse information about the issuer.

FAQ

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

What does the Form 144 filing for INSM report?

The Form 144 reports an intended sale of 1,660 shares of INSM common stock on or about 01/08/2026 through Merrill Lynch on the NASDAQ exchange.

How many INSM shares are planned to be sold under this notice?

The notice covers a planned sale of 1,660 common shares of the issuer’s stock.

How many INSM shares were outstanding when this Form 144 was filed?

The filing states that there were 213,273,469 shares of the relevant class of common stock outstanding.

How were the INSM shares to be sold under Form 144 acquired?

The 1,660 shares to be sold were acquired on 01/06/2026 via stock plan activity from the issuer.

What prior INSM share sales by the filer are disclosed in the last 3 months?

The filing lists several past sales by Martina Flammer, including 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, among other transactions.

What representation does the Form 144 signer make about INSM?

The signer represents that they do not know of any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed.

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	1660	288674	213273469	01/08/2026	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	01/06/2026	Stock Plan Activity	Issuer			1660	01/06/2026	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	01/07/2026	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	01/08/2026
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)