William Lewis files Form 144 — Insmed (NASDAQ: INSM) reports recent share dispositions

Rhea-AI Filing Summary

Insmed Inc. insider William Lewis submitted a Form 144 reporting proposed dispositions of Common Stock. The filing lists multiple sale dates and share quantities reported under "Securities Sold During The Past 3 Months," including 6,515 shares on 06/08/2026, 7,605 shares on 06/03/2026, and earlier entries in May and April 2026.

Insights

Securities Attorney

Form 144 notifies the market of intended Rule 144 dispositions by an affiliate.

Form 144 is an administrative notice required when certain affiliates intend to sell restricted or control securities under Rule 144. It lists proposed sale dates and share quantities, which in this excerpt include multiple transactions in April–June 2026.

Filing does not itself report settlement or proceeds; subsequent trade reports or broker records show completed transactions. Future public filings may clarify actual sales and cash-flow outcomes.

Key Figures

Form type: Form 144 Shares reported 06/08/2026: 6,515 shares Shares reported 06/03/2026: 7,605 shares +5 more

8 metrics

Form type Form 144 Notice of proposed dispositions

Shares reported 06/08/2026 6,515 shares Securities Sold During The Past 3 Months

Shares reported 06/03/2026 7,605 shares Securities Sold During The Past 3 Months

Shares reported 05/18/2026 25,564 shares Securities Sold During The Past 3 Months

Shares reported 05/13/2026 13,283 shares Securities Sold During The Past 3 Months

Shares reported 05/04/2026 10,699 shares Securities Sold During The Past 3 Months

Shares reported 04/16/2026 10,699 shares Securities Sold During The Past 3 Months

Shares reported 04/06/2026 10,699 shares Securities Sold During The Past 3 Months

Key Terms

Securities Sold During The Past 3 Months, Stock Plan Activity, Issuer

3 terms

Securities Sold During The Past 3 Months regulatory

"Securities Sold During The Past 3 Months | William Lewis ..."

Stock Plan Activity financial

"06/25/2026 | Stock Plan Activity | Issuer"

Issuer regulatory

"06/25/2026 | Stock Plan Activity | Issuer"

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Available on EDGAR 06/25/2026 - 04:14 PM Accepted by SEC EDGAR 06/25/2026 - 04:14 PM 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
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	21398	2210653	216752451	06/25/2026	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	06/25/2026	Stock Plan Activity	Issuer			21398	06/25/2026	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	06/08/2026	6515	612576
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	06/03/2026	7605	777746
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/18/2026	25564	2718106
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/13/2026	13283	1543186
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/04/2026	10699	1469434
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	04/16/2026	10699	1540292
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	04/06/2026	10699	1746319

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

Who filed the Form 144 for INSM?

William Lewis filed the Form 144. The excerpt names William Lewis as the reporting person and includes his address. The filing identifies multiple reported dispositions of Common Stock across April through June 2026 under "Securities Sold During The Past 3 Months."

What share sales does the Form 144 list for INSM?

The filing lists multiple share amounts and dates. Examples include 6,515 shares on 06/08/2026, 7,605 shares on 06/03/2026, 25,564 shares on 05/18/2026, plus entries on 05/13, 05/04, 04/16, and 04/06/2026 as shown in the excerpt.

Does the Form 144 show the transaction method or proceeds?

The excerpt lists share amounts and dates but does not present proceeds or specific sale methods. It groups activity under "Securities Sold During The Past 3 Months" and notes "Stock Plan Activity" and "Issuer" in header fields without dollar-value disclosures.

What does a Form 144 filing signal to investors for INSM?

Form 144 signals an affiliate's intention to dispose of restricted or control securities under Rule 144. This excerpt documents reported proposed dispositions by William Lewis with dated share counts; it serves as a regulatory notice rather than proof of settlement.

Are the reported share counts cumulative or individual entries?

The filing presents individual sale entries by date and quantity. The excerpt shows separate lines for each transaction date (for example, 6,515 shares on 06/08/2026 and 7,605 shares on 06/03/2026), not an aggregated total in the visible text.