Insmed (NASDAQ: INSM) insider files Form 144 to sell 5,138 shares

Rhea-AI Filing Summary

Insmed submitted a notice of proposed sale under Rule 144 for 5,138 common shares, to be sold through Merrill Lynch on the NASDAQ around 01/08/2026. The filing lists an aggregate market value of 894,885 for these shares and notes that common shares outstanding total 213,273,469.

The securities to be sold were acquired from the issuer through stock plan activity on 01/04/2026, 01/05/2026, and 01/06/2026 in amounts of 1,603, 1,648, and 1,887 common shares, respectively. The person for whose account the shares are to be sold, identified as Martina Flammer, previously sold common shares over the past three months, 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.

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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	5138	894885	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	01/04/2026	Stock Plan Activity	Issuer			1603	01/04/2026	n/a
Common	01/05/2026	Stock Plan Activity	Issuer			1648	01/05/2026	n/a
Common	01/06/2026	Stock Plan Activity	Issuer			1887	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

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Insmed (INSM) disclose in this Form 144 filing?

The filing discloses a planned sale under Rule 144 of 5,138 common shares of Insmed, to be sold through Merrill Lynch on the NASDAQ around 01/08/2026, with an aggregate market value of 894,885.

Who is the seller in the Insmed (INSM) Form 144 notice?

The Form 144 lists Martina Flammer, with an address in Bridgewater, New Jersey, as the seller of common shares in the table of securities sold during the past three months and as the person for whose account the securities are to be sold.

How many Insmed (INSM) shares are outstanding according to the Form 144?

The securities information section reports that the number of common shares outstanding is 213,273,469.

How were the Insmed (INSM) shares being sold under Form 144 acquired?

The notice states that the common shares were obtained via Stock Plan Activity from the issuer on 01/04/2026, 01/05/2026, and 01/06/2026, in amounts of 1,603, 1,648, and 1,887 shares, respectively.

What prior sales of Insmed (INSM) shares are reported in the past three months?

The document lists several past sales of Insmed common shares by Martina Flammer, including 31,226 shares on 11/11/2025 for gross proceeds of 5,921,820 and 8,895 shares on 12/01/2025 for gross proceeds of 1,840,841, along with additional sales on 01/05/2026, 01/06/2026, and 01/07/2026.

What representation does the seller make in this Insmed (INSM) Form 144?

By signing the notice, the person for whose account the securities are to be sold represents that they do not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed, and acknowledges that intentional misstatements or omissions can constitute Federal Criminal Violations.