INSM insider plans sale of 795 common shares

INSM insider Martina Flammer filed a notice to sell 795 shares of common stock through Merrill Lynch on or about 02/03/2026 on NASDAQ, with an aggregate market value of 123,837 and 213,273,469 shares outstanding.

Accepted by SEC EDGAR 02/03/2026 - 04:56 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

INSM insider Martina Flammer filed a notice to sell 795 shares of common stock through Merrill Lynch on or about 02/03/2026 on NASDAQ, with an aggregate market value of 123,837 and 213,273,469 shares outstanding. The 795 shares were acquired on 02/01/2026 via stock plan activity from the issuer.

Over the prior three months, Flammer has sold multiple blocks of INSM common stock, including 31,226 shares on 11/11/2025 for gross proceeds of 5,921,820 and 12,303 shares on 01/05/2026 for gross proceeds of 2,108,459.

FAQ

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What does the INSM Form 144 filing by Martina Flammer disclose?

The Form 144 discloses that insider Martina Flammer intends to sell 795 INSM common shares through Merrill Lynch on or about 02/03/2026 on NASDAQ. These shares were acquired via stock plan activity on 02/01/2026 directly from the issuer.

How many INSM shares is the insider currently planning to sell?

The filing shows a planned sale of 795 INSM common shares. The notice lists an aggregate market value of 123,837 for this block, with trades to be executed through Merrill Lynch and the shares listed on NASDAQ.

How many INSM shares are outstanding according to this Form 144?

The Form 144 lists 213,273,469 INSM common shares as outstanding. This figure provides context for the planned 795-share sale, indicating the sale is small relative to the total share count referenced in the notice.

How were the 795 INSM shares to be sold acquired by the insider?

The 795 INSM common shares were acquired on 02/01/2026 through a stock plan activity transaction directly from the issuer. The form identifies the issuer as the source and classifies the acquisition as stock plan related, with payment dated the same day.

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

The filing lists several prior INSM common stock sales, including 31,226 shares on 11/11/2025 for gross proceeds of 5,921,820 and 12,303 shares on 01/05/2026 for gross proceeds of 2,108,459, among other transactions.

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

The Form 144 identifies Merrill Lynch, located at 1800 K St NW, Suite 800, Washington DC 20006, as the broker handling the planned sale of 795 INSM common shares. The shares are listed for trading on the NASDAQ exchange.

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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 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	795	123837	213273469	02/03/2026	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	02/01/2026	Stock Plan Activity	Issuer			795	02/01/2026	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	02/02/2026	7982	1233964
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	02/03/2026
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)