INSM (NASDAQ: INSM) Form 144: 2,370-share plan sale; prior Adsett trades listed

Rhea-AI Filing Summary

INSM submitted a Form 144 notice reporting a proposed sale of 2,370 shares of Common Stock as Stock Plan Activity dated 06/01/2026.

The excerpt also lists sales by Roger Adsett: 5,837 shares on 05/13/2026 and 88,060 shares on 04/01/2026. Shares outstanding are shown as 216,752,451 as of 06/03/2026.

Insights

Securities Compliance Analyst

Form 144 notice lists a small issuer-side sale and recent affiliate dispositions.

The filing excerpt shows a proposed sale of 2,370 shares under a stock plan dated 06/01/2026, and two prior dispositions by Roger Adsett of 5,837 and 88,060 shares on 05/13/2026 and 04/01/2026 respectively. The excerpt also records 216,752,451 shares outstanding as of 06/03/2026.

These entries are routine Rule 144 notices reflecting proposed or recent affiliate sales. Cash‑flow treatment and whether sales were effected under a trading plan are not stated in the excerpt; subsequent filings or broker confirmations would show execution details.

Key Figures

Proposed sale: 2,370 shares Prior disposition: 5,837 shares Prior disposition: 88,060 shares +1 more

4 metrics

Proposed sale 2,370 shares Stock Plan Activity dated 06/01/2026

Prior disposition 5,837 shares Sale by Roger Adsett on 05/13/2026

Prior disposition 88,060 shares Sale by Roger Adsett on 04/01/2026

Shares outstanding 216,752,451 as of 06/03/2026

Key Terms

Form 144, Stock Plan Activity, Securities Sold During The Past 3 Months

3 terms

Form 144 regulatory

"Filer Information | 144: Filer Information"

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

"Securities To Be Sold | Common | 06/01/2026 | Stock Plan Activity"

Securities Sold During The Past 3 Months regulatory

"Securities Sold During The Past 3 Months | Roger Adsett"

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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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	2370	242379	216752451	06/03/2026	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			2370	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
Roger Adsett 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/13/2026	5837	678128
Roger Adsett 700 US Highway 202/206 Bridgewater NJ 08807	Common	04/01/2026	88060	14497473

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does INSM's Form 144 disclose?

It discloses a proposed sale of 2,370 shares dated 06/01/2026. The notice is labeled as Stock Plan Activity and is a regulatory filing that signals an intended affiliate sale.

Who recently sold shares according to the excerpt for INSM?

The excerpt lists sales by Roger Adsett: 88,060 shares on 04/01/2026 and 5,837 shares on 05/13/2026. These are reported dispositions in the past three months.

How many INSM shares are outstanding per the excerpt?

The excerpt shows 216,752,451 shares outstanding as of 06/03/2026. This figure appears as a baseline context number in the filing excerpt.

Does the Form 144 confirm these shares were sold?

No. The Form 144 entry reports a proposed sale notice of 2,370 shares dated 06/01/2026. Execution and settlement details are not provided in the excerpt.