Insmed insider plans Rule 144 sale of 1,517 shares

Insmed Inc. filed a notice of proposed insider sale under Rule 144.

Accepted by SEC EDGAR 01/06/2026 - 04:40 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Insmed Inc. filed a notice of proposed insider sale under Rule 144. The filing covers planned sales of 1,517 shares of common stock through Merrill Lynch, with an aggregate market value of $262,941. These shares are part of a class with 213,273,469 shares outstanding and are expected to be sold on or about 01/06/2026 on the NASDAQ exchange. The seller acquired the 1,517 common shares on 01/04/2026 through stock plan activity directly from the issuer, with the payment also dated 01/04/2026 and described as stock plan related ("n/a" for cash nature of payment).

FAQ

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

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

The filing discloses a proposed sale under Rule 144 of 1,517 shares of Insmed common stock, with an aggregate market value of $262,941, to be sold on NASDAQ.

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

The notice states that the class of common stock in which the sale is planned has 213,273,469 shares outstanding.

When were the Insmed (INSM) shares to be sold under Rule 144 acquired?

The 1,517 common shares were acquired on 01/04/2026 through stock plan activity from the issuer.

When is the proposed sale date for the Insmed (INSM) shares in this notice?

The approximate date of sale listed is 01/06/2026, with the transaction expected to occur on the NASDAQ exchange.

Which broker is handling the planned Insmed (INSM) share sale?

The broker named is Merrill Lynch, with an address at 1800 K St NW, Suite 800, Washington, DC 20006.

What is the source and nature of payment for the Insmed (INSM) shares being sold?

The shares were obtained via stock plan activity from the issuer, with the nature of payment noted as "n/a", indicating it is tied to the stock plan rather than a separate cash purchase.

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	0001604019
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	Sara Bonstein
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	1517	262941	213273469	01/06/2026	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			1517	01/04/2026	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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	01/06/2026
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	Sara Bonstein
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)