Sara Bonstein plans sale of 748 INSM shares

Insmed insider Sara Bonstein has filed a Form 144 notice to sell 748 shares of common stock.

Accepted by SEC EDGAR 02/03/2026 - 04:55 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Insmed insider Sara Bonstein has filed a Form 144 notice to sell 748 shares of common stock. The shares are to be sold through Merrill Lynch on the NASDAQ around 02/03/2026, with an aggregate market value of 116,938 based on the figure reported.

The 748 shares were acquired on 02/01/2026 through stock plan activity directly from the issuer. Over the prior three months, Bonstein reported additional sales of common stock, including 1,447 shares on 01/08/2026, 1,678 shares on 01/07/2026, and 1,517 shares on 01/06/2026, with gross proceeds of 252,023, 293,766, and 262,941, respectively.

FAQ

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

How many INSM shares is Sara Bonstein planning to sell in this Form 144?

Sara Bonstein plans to sell 748 shares of Insmed common stock. The shares are to be sold through Merrill Lynch on NASDAQ around 02/03/2026, following acquisition via stock plan activity on 02/01/2026.

What type of Insmed securities are covered in this Form 144 filing?

The Form 144 covers Insmed common stock. It shows 748 common shares to be sold through Merrill Lynch on NASDAQ, acquired on 02/01/2026 via stock plan activity directly from the issuer.

When were the INSM shares in this Form 144 acquired and how?

The 748 Insmed shares were acquired on 02/01/2026 through stock plan activity. The filing lists the issuer as the source of the shares, reflecting equity compensation rather than an open-market purchase.

Which broker and exchange will handle Sara Bonsteins planned INSM share sale?

The planned sale of 748 Insmed common shares will be handled by Merrill Lynch at its Washington, DC office. The filing lists NASDAQ as the securities exchange where the shares are expected to be sold.

What INSM share sales has Sara Bonstein reported in the past three months?

The filing lists three prior Insmed share sales: 1,447 shares on 01/08/2026, 1,678 shares on 01/07/2026, and 1,517 shares on 01/06/2026. Reported gross proceeds were 252,023, 293,766, and 262,941, respectively.

What gross proceeds were reported from recent INSM stock sales by Sara Bonstein?

Recent reported gross proceeds include 252,023 from a 1,447-share sale on 01/08/2026, 293,766 from 1,678 shares on 01/07/2026, and 262,941 from 1,517 shares on 01/06/2026, all involving Insmed common stock.

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 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	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	748	116938	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			748	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
Sara Bonstein 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/08/2026	1447	252023
Sara Bonstein 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/07/2026	1678	293766
Sara Bonstein 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/06/2026	1517	262941

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