INSMED Inc SEC Filing

INSM filing a Form 144 notice reporting proposed sales of Common Stock by an insider.

Accepted by SEC EDGAR 03/30/2026 - 05:31 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

INSM filing a Form 144 notice reporting proposed sales of Common Stock by an insider. The excerpt lists multiple disposition dates in Q1 2026 and specific lots attributed to Michael Smith, including 24,774 shares on 02/24/2026 and earlier smaller lots in January and February.

Insights

Securities Counsel

Routine Form 144 notice for planned insider dispositions; filings list multiple lot sizes.

The excerpt documents proposed sales under a stock plan or other disposition mechanism, naming Michael Smith with dated lots and numeric entries that appear to show shares and accompanying numbers. The filing type signals regulatory notice, not execution confirmation.

Timing and cash‑flow outcomes depend on actual transactions; subsequent Form 4 or broker records would show executed sales. Future filings may disclose executed amounts and final holdings.

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	0001870278
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	Michael Smith
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	19638	2964929	215551896	03/30/2026	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	03/30/2026	Stock Plan Activity	Issuer			19638	03/30/2026	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
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	02/24/2026	24774	3859153
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	02/03/2026	640	100012
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/08/2026	1053	183401
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/07/2026	709	124124
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/06/2026	1396	241968

144: Remarks and Signature

Remarks
Date of Notice	03/30/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/07/2025
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	Michael Smith
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)