INSM Form 144: Michael Smith reports multiple share dispositions

INSM filed Form 144 disclosing proposed sales of Common Stock by an insider and issuer stock plan activity.

Rhea-AI Filing Summary

INSM filed Form 144 disclosing proposed sales of Common Stock by an insider and issuer stock plan activity. The filing lists multiple proposed dispositions by Michael Smith: 1,959 (appears as 1,959?), sorry—must use exact counts from the excerpt: the excerpt shows sale entries of 2,159 on 06/03/2026, 6,149 on 05/22/2026, 4,109 on 05/13/2026, and 19,638 on 03/30/2026. The filing also records stock plan activity dated 06/01/2026. These entries are disclosures of planned or reported dispositions; cash‑flow treatment and prices are not included in the excerpt.

Insights

Securities Compliance Analyst

Form 144 entries show multiple planned insider dispositions by Michael Smith and a separate issuer stock plan entry.

The filing lists discrete sale notices for Common Stock on 03/30/2026, 05/13/2026, 05/22/2026, and 06/03/2026, with share counts stated for each notice. The excerpt also shows a Stock Plan Activity line dated 06/01/2026.

These filings are routine regulatory notices of intended dispositions; the excerpt does not disclose prices, proceeds, or whether sales occurred in the open market. Subsequent public filings or transaction confirmations would show completion and cash‑flow details.

Key Figures

Proposed sale (03/30/2026): 19,638 shares Proposed sale (05/13/2026): 4,109 shares Proposed sale (05/22/2026): 6,149 shares +2 more

5 metrics

Proposed sale (03/30/2026) 19,638 shares listed on Form 144 dated 03/30/2026

Proposed sale (05/13/2026) 4,109 shares listed on Form 144 dated 05/13/2026

Proposed sale (05/22/2026) 6,149 shares listed on Form 144 dated 05/22/2026

Proposed sale (06/03/2026) 2,159 shares listed on Form 144 dated 06/03/2026

Stock plan activity activity dated 06/01/2026 Issuer stock plan activity line in excerpt

Key Terms

Form 144, Stock Plan Activity, Issuer

3 terms

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

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

"06/01/2026 | Stock Plan Activity | Issuer"

Issuer regulatory

"Stock Plan Activity | Issuer"

FAQ

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

What does INSM's Form 144 disclose about insider transactions?

The Form 144 lists proposed dispositions of Common Stock by Michael Smith on specific dates. It shows share counts of 19,638; 4,109; 6,149; and 2,159 tied to dates in March–June 2026 and a separate stock plan activity entry dated 06/01/2026.

Does the Form 144 excerpt state sale prices or proceeds for INSM shares?

No, the excerpt does not provide sale prices or proceeds. It lists proposed share dispositions and a stock plan activity date but contains no pricing or cash‑flow details; trade confirmations would show final prices and proceeds.

Who is the reporting insider named in the INSM excerpt?

The reporting person shown is Michael Smith at the Bridgewater, NJ address. The excerpt attributes multiple Common Stock disposition entries to that individual on March through June 2026.

What is the meaning of the 'Stock Plan Activity' line dated 06/01/2026 in the INSM excerpt?

The line labels a Stock Plan Activity event for the issuer dated 06/01/2026. The excerpt does not detail shares issued, withheld, or exercised; it only records the activity type and date in the filing extract.

Are the listed share counts in the Form 144 the same as holdings after the transactions?

The excerpt shows share counts tied to each proposed disposition but does not state post‑transaction holdings. It does not show 'shares following' or remaining positions, so post‑transaction holdings cannot be determined from this text.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 06/22/2026 - 04:20 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 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	1806	173039	216752451	06/22/2026	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	06/01/2026	Stock Plan Activity	Issuer			1806	06/01/2026	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	06/03/2026	2159	220795
Michael Smith 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/22/2026	6149	666951
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

144: Remarks and Signature

Remarks
Date of Notice	06/22/2026
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)