INSM (NASDAQ: INSM) insider lists proposed Common share sales in Form 144

Rhea-AI Filing Summary

INSM Section 144 notice reports proposed sales of Common stock by Roger Adsett. The filing lists four sales dates and share counts: 02/03/2026: 791 shares; 01/08/2026: 2,059 shares; 01/07/2026: 802 shares; 01/06/2026: 1,429 shares. The entries appear under "Securities Sold During The Past 3 Months" and are labeled as Stock Plan Activity.

Insights

Securities Compliance Analyst

Routine Section 144 notices document proposed insider sales under a stock plan.

The filing lists multiple proposed disposals by Roger Adsett totaling specific share counts on discrete dates in early 2026. Section 144/Rule 144 notices are procedural and inform potential broker/dealers of the reporting person's intent to sell restricted or control securities.

These entries are administrative disclosure of planned sales; cash‑flow treatment and whether transactions completed are not stated in the excerpt. Subsequent trade confirmations or Form 4/Form 5 filings would show executed activity and final holdings.

Key Figures

02/03/2026 sale: 791 shares 01/08/2026 sale: 2,059 shares 01/07/2026 sale: 802 shares +1 more

4 metrics

02/03/2026 sale 791 shares Securities Sold During The Past 3 Months

01/08/2026 sale 2,059 shares Securities Sold During The Past 3 Months

01/07/2026 sale 802 shares Securities Sold During The Past 3 Months

01/06/2026 sale 1,429 shares Securities Sold During The Past 3 Months

Key Terms

Form 144, Stock Plan Activity, Issuer

3 terms

Form 144 regulatory

"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

"04/01/2026 | Stock Plan Activity"

Issuer regulatory

"04/01/2026 | Stock Plan Activity | Issuer"

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	88060	14465616	215551896	04/01/2026	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	04/01/2026	Stock Plan Activity	Issuer			88060	04/01/2026	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	02/03/2026	791	123526
Roger Adsett 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/08/2026	2059	358616
Roger Adsett 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/07/2026	802	140406
Roger Adsett 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/06/2026	1429	247688

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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 the INSM Form 144 filing show?

It shows proposed sales of Common stock by Roger Adsett on specific early‑2026 dates. The filing lists four sales with exact share counts and dates for Section 144 notification purposes.

How many shares did Roger Adsett list for sale on 01/08/2026 in the INSM filing?

Roger Adsett listed 2,059 shares for the 01/08/2026 entry. The line appears under "Securities Sold During The Past 3 Months" as stock plan activity in the excerpt.

Do these Form 144 entries confirm completed trades for INSM?

No. Form 144 entries document proposed or intended sales under Rule 144 and do not by themselves confirm execution. Completion would appear in broker records or subsequent Forms 4/5 where applicable.

What is the role of "Stock Plan Activity" in this Form 144 for INSM?

The term indicates the listed sales relate to stock plan transactions (vesting, exercise, or plan distributions). The excerpt labels the entries as "Stock Plan Activity" but does not detail the underlying plan mechanics.

Who is the reporting person named in the INSM Form 144 excerpt?

The reporting person shown is Roger Adsett with an address in Bridgewater, NJ. His name appears alongside each dated sale entry in the provided excerpt.