INSM Form 144: Insider Resales and Plan Issuances

INSM filed a Form 144 disclosing recent resale notices and issuer stock plan activity.

Accepted by SEC EDGAR 02/24/2026 - 04:33 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

INSM filed a Form 144 disclosing recent resale notices and issuer stock plan activity. The filing lists multiple issuer plan issuances on 01/04/2026, 01/05/2026, 01/06/2026, 02/01/2026, and 02/24/2026 with amounts of 1,554, 874, 1,312, 786, and 20,248 shares respectively.

The filing also shows sales by Michael Smith on 01/06/2026 (1,396 shares), 01/07/2026 (709 shares), 01/08/2026 (1,053 shares), and 02/04/2026 (640 shares). The excerpt lists 215,551,896 shares outstanding as of 02/24/2026.

Insights

Securities Counsel

Routine resale notices and issuer plan issuances; no pricing or proceeds disclosed.

The Form 144 lists multiple issuer stock plan issuances and several small sales by Michael Smith, each with explicit share counts and dates. The filing gives transaction-level detail but does not state sale prices or proceeds.

Timing and cash‑flow treatment are not shown in the excerpt; subsequent filings or broker records would show execution details if relevant.

FAQ

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

What does INSM's Form 144 disclose?

It discloses resale notices and issuer stock plan activity with specific share counts and dates. The filing lists issuer plan issuances on 01/04/2026, 01/05/2026, 01/06/2026, 02/01/2026, and 02/24/2026 and multiple sales by Michael Smith.

How many shares did Michael Smith sell according to INSM's filing?

Michael Smith sold four tranches totaling listed share amounts on specific dates. The excerpt shows sales of 1,396, 709, 1,053, and 640 shares on 01/06/2026, 01/07/2026, 01/08/2026, and 02/04/2026 respectively.

Are proceeds or prices disclosed in the INSM Form 144 excerpt?

No; the excerpt provides share counts and dates but does not disclose sale prices or aggregate proceeds. The filing lists transaction quantities and dates without price or cash‑flow details.

What issuer stock plan activity is listed in the filing?

The filing lists issuer stock plan issuances on several dates with explicit share counts. Examples include 1,554 shares on 01/04/2026 and 20,248 shares on 02/24/2026 as shown in the excerpt.

How many shares outstanding does the excerpt show for INSM?

The excerpt shows 215,551,896 shares outstanding as of 02/24/2026. This figure appears in the securities information block of the provided content.

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 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	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	24774	3859153	215551896	02/24/2026	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	02/24/2026	Stock Plan Activity	Issuer			20248	02/24/2026	n/a
Common	01/04/2026	Stock Plan Activity	Issuer			1554	01/04/2026	n/a
Common	01/05/2026	Stock Plan Activity	Issuer			874	01/05/2026	n/a
Common	01/06/2026	Stock Plan Activity	Issuer			1312	01/06/2026	n/a
Common	02/01/2026	Stock Plan Activity	Issuer			786	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
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	02/04/2026	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	02/24/2026
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)