INSM (NASDAQ: INSM) insider schedules Rule 144 common share sale

Rhea-AI Filing Summary

INSM insider William Lewis has filed a notice to sell additional common shares under Rule 144. The filing covers 3223 common shares to be sold through Merrill Lynch at an aggregate market value of 561349, with 213273469 shares of the issuer’s common stock outstanding and the shares listed on NASDAQ.

These 3223 shares were acquired on 01/06/2026 via stock plan activity from the issuer, with payment completed the same day. Over the past three months, Lewis has also sold common shares of the issuer in several transactions, including 10699 shares for gross proceeds of 1786437 on 12/18/2025 and 10699 shares for 2199583 on 12/04/2025. By signing the notice, he represents that he is not aware of any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed.

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	3223	561349	213273469	01/08/2026	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	01/06/2026	Stock Plan Activity	Issuer			3223	01/06/2026	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
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/07/2026	2357	412639
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/06/2026	4096	709959
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	12/18/2025	10699	1786437
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	12/04/2025	10699	2199583

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 the INSM Form 144 filing disclose about planned share sales?

The filing discloses that 3223 common shares are planned to be sold through Merrill Lynch, with an aggregate market value of 561349, and the shares are listed on NASDAQ.

Who is selling INSM shares in this Form 144 and how were they acquired?

The seller is William Lewis. The 3223 common shares to be sold were acquired on 01/06/2026 via Stock Plan Activity from the issuer.

What does the Form 144 say about recent INSM share sales by this insider?

Over the past three months, William Lewis sold INSM common shares in several transactions, including 10699 shares for 1786437 on 12/18/2025 and 10699 shares for 2199583 on 12/04/2025.

How many INSM shares are outstanding according to this Form 144?

The notice reports that the issuer has 213273469 common shares outstanding at the time of the planned sale.

What representation does the INSM insider make about non-public information?

By signing the notice, the seller represents that they do not know any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed.

On which exchange are the INSM shares in this Form 144 listed?

The common shares referenced in the filing are listed on the NASDAQ exchange.