INSM insider files Form 144 to sell shares

INSM notice of proposed sale under Form 144 reporting planned dispositions of Common Stock by Michael Smith.

Rhea-AI Filing Summary

INSM notice of proposed sale under Form 144 reporting planned dispositions of Common Stock by Michael Smith. The filing lists three recent sale entries dated 05/13/2026, 03/30/2026, and 02/24/2026

Key Figures

Form type: Form 144 Sale on 05/13/2026: 4,109 shares Sale on 03/30/2026: 19,638 shares +3 more

6 metrics

Form type Form 144 Notice of proposed sale

Sale on 05/13/2026 4,109 shares Michael Smith reported disposition

Sale on 03/30/2026 19,638 shares Michael Smith reported disposition

Sale on 02/24/2026 24,774 shares Michael Smith reported disposition

Broker listed Merrill Lynch Address: 1800 K St NW Suite 800 Washington DC 20006

Exchange NASDAQ Listed market in header

Key Terms

Form 144, Stock plan activity, Issuer

3 terms

Form 144 regulatory

"notice of proposed sale under Form 144 reporting planned dispositions"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Stock plan activity financial

"listed method: Stock plan activity on 05/11/2026"

Issuer regulatory

"method/mode column shows 'Issuer' for the sales row"

FAQ

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

What does the INSM Form 144 filing disclose?

The filing discloses proposed dispositions of Common Stock by Michael Smith. It lists three sale dates: 05/13/2026, 03/30/2026, and 02/24/2026 with share counts shown in the table.

How many shares did Michael Smith report selling recently on INSM Form 144?

The excerpt lists three transactions with share counts of 4,109, 19,638, and 24,774 respectively. Each line pairs a sale date with a numeric value in the provided table.

Does the Form 144 specify where the INSM shares were sold?

The filing identifies the activity as Stock plan activity and lists the method as Issuer on 05/11/2026. The excerpt does not include detailed venue or broker execution specifics beyond the address and broker name.

Who is the reporting person on the INSM Form 144?

The reporting person named is Michael Smith with an address listed at 700 US Highway 202/206, Bridgewater, NJ 08807. His name appears beside each reported Common Stock disposition in the excerpt.

Does the Form 144 show remaining holdings after the sales?

The table includes numeric values adjacent to each sale row (for example 477,373, 2,964,929, 3,859,153), but the excerpt does not label those figures explicitly as post-sale holdings in clear text.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/22/2026 - 04:55 PM EDT Learn about SEC filing dates

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
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	6149	666951	216752451	05/22/2026	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	05/11/2026	Stock plan activity	Issuer			6149	05/11/2026	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	05/13/2026	4109	477373
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	03/30/2026	19638	2964929
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	02/24/2026	24774	3859153

144: Remarks and Signature

Remarks
Date of Notice	05/22/2026
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)