Insmed (NASDAQ: INSM) insider files to sell 13396 common shares

Rhea-AI Filing Summary

William Lewis filed a Rule 144 notice to sell 13396 Insmed common shares. The filing lists Merrill Lynch as broker, with the shares to be sold on NASDAQ and an aggregate market value of 1979774. It notes 213273469 common shares outstanding.

The shares to be sold were acquired through stock plan activity, including 10699 shares on 02/09/2026 and 2697 shares on 02/01/2026. The notice also details several prior open-market sales over the past three months with disclosed share counts and gross proceeds.

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	13396	1979774	213273469	02/09/2026	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	02/09/2026	Stock Plan Activity	Issuer			10699	02/09/2026	n/a
Common	02/01/2026	Stock Plan Activity	Issuer			2697	02/01/2026	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
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	02/03/2026	3009	470412
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/20/2026	10699	1700420
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/12/2026	19215	3247325
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	01/08/2026	3223	561349
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

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 Insmed (INSM) Form 144 filing by William Lewis disclose?

The Form 144 filing discloses that William Lewis plans to sell 13396 Insmed common shares under Rule 144. It provides acquisition details, broker information, recent sale history, and confirms that Insmed has 213273469 common shares outstanding, giving context for the planned sale size.

How many Insmed (INSM) shares is William Lewis planning to sell and through which broker?

William Lewis plans to sell 13396 Insmed common shares, using Merrill Lynch as the broker. The transaction is to occur on NASDAQ, with the filing listing an aggregate market value of 1979774 for the proposed sale under Rule 144 requirements.

How were the Insmed (INSM) shares in the Form 144 acquired by William Lewis?

The shares in the Form 144 were acquired through stock plan activity from the issuer. The filing lists 10699 common shares acquired on 02/09/2026 and 2697 common shares acquired on 02/01/2026, both recorded with non-cash "n/a" payment descriptions.

What recent Insmed (INSM) share sales by William Lewis are reported in the Form 144?

The notice lists several prior sales over the past three months, including 19215 common shares sold on 01/12/2026 for gross proceeds of 3247325 and 10699 shares sold on 01/20/2026 for 1700420, along with additional transactions in December 2025 and early January 2026.

What does the Insmed (INSM) Form 144 say about shares outstanding?

The Form 144 states that 213273469 Insmed common shares are outstanding. This figure provides a baseline to understand the scale of the 13396-share planned sale relative to the company’s total common stock base listed in the notice.

On which exchange will the Insmed (INSM) shares in the Form 144 be sold?

The filing indicates that the Insmed common shares covered by the Form 144 notice are expected to be sold on NASDAQ. Merrill Lynch is listed as the broker, with the proposed sale having an aggregate market value of 1979774 according to the document.