Insider plans sale of 1,678 common shares

An insider has filed a notice to sell 1,678 common shares of the issuer through Merrill Lynch on or about 01/07/2026 on the NASDAQ.

Accepted by SEC EDGAR 01/07/2026 - 04:42 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

An insider has filed a notice to sell 1,678 common shares of the issuer through Merrill Lynch on or about 01/07/2026 on the NASDAQ. The filing lists an aggregate market value of 293,935 for these planned sales, compared with 213,273,469 shares outstanding for the issuer.

The shares to be sold were acquired on 01/05/2026 as stock plan activity from the issuer. The notice also discloses that Sara Bonstein sold 1,517 common shares on 01/06/2026, generating gross proceeds of 262,941 over the past three months.

FAQ

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

How many INSM shares are planned to be sold under this Form 144 notice?

The notice covers a planned sale of 1,678 common shares of the issuer’s stock, to be sold through Merrill Lynch on the NASDAQ, with an aggregate market value of 293,935.

When and how were the INSM shares being sold acquired?

The 1,678 common shares are reported as acquired on 01/05/2026 via stock plan activity from the issuer, with the amount of securities acquired matching the planned sale amount.

What is the approximate sale date and trading venue for these INSM shares?

The approximate sale date stated is 01/07/2026, and the securities are expected to be sold on the NASDAQ through Merrill Lynch, 1800 K St NW, Suite 800, Washington, DC 20006.

How many INSM shares are outstanding according to this notice?

The filing states that the number of shares or other units outstanding for the issuer is 213,273,469 common shares at the time referenced.

What INSM stock sales by the same person occurred in the past three months?

The document reports that Sara Bonstein, at an address in Bridgewater, NJ, sold 1,517 common shares on 01/06/2026, with gross proceeds of 262,941 during the past three months.

What representation does the seller make about non-public information on INSM?

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.

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	1678	293935	213273469	01/07/2026	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	01/05/2026	Stock Plan Activity	Issuer			1678	01/05/2026	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	01/06/2026	1517	262941

144: Remarks and Signature

Remarks
Date of Notice	01/07/2026
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)