Insmed officer William Lewis proposes $2.21M sale

The reported sale carries an aggregate market value of $2,210,653, with September 4, 2025 listed as the Rule 10b5-1 plan adoption or instruction date.

Accepted by SEC EDGAR 06/25/2026 - 04:14 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

INSMED Inc officer William Lewis reported a proposed sale of 21,398 common shares, with an aggregate market value of $2,210,653 and an approximate sale date of June 25, 2026. The listed Rule 10b5-1 plan adoption or instruction date is September 4, 2025.

Key Figures

Shares proposed for sale: 21,398 common shares Aggregate market value: $2,210,653 Shares outstanding: 216,752,451 shares

3 metrics

Shares proposed for sale 21,398 common shares Approximate sale date: June 25, 2026

Aggregate market value $2,210,653 Proposed sale of common shares

Shares outstanding 216,752,451 shares Issuer shares outstanding shown in the securities information

Key Terms

Rule 10b5-1, Aggregate Market Value, Stock Plan Activity

3 terms

Rule 10b5-1 regulatory

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

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

Aggregate Market Value financial

"Number of Shares or Other Units To Be Sold | Aggregate Market Value"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Stock Plan Activity technical

"Nature of Acquisition Transaction: Stock Plan Activity"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many INSM shares is William Lewis proposing to sell?

William Lewis, an officer of INSMED Inc, reported a proposed sale of 21,398 common shares with an aggregate market value of $2,210,653, at an approximate sale date of June 25, 2026. The listed Rule 10b5-1 plan adoption or instruction date is September 4, 2025.

What recent INSM share sales by William Lewis are listed?

The prior sales listed for William Lewis, an officer of INSMED Inc, were: 6,515 shares for gross proceeds of $612,576 on June 8, 2026; 7,605 shares for $777,746 on June 3, 2026; 25,564 shares for $2,718,106 on May 18, 2026; 13,283 shares for $1,543,186 on May 13, 2026; 10,699 shares for $1,469,434 on May 4, 2026; 10,699 shares for $1,540,292 on April 16, 2026; and 10,699 shares for $1,746,319 on April 6, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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	0001402051
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	INSMED INC
SEC File Number	000-30739
Address of Issuer	700 US Highway 202/206 Bridgewater NEW JERSEY 08807
Phone	9089779900
Name of Person for Whose Account the Securities are To Be Sold	William Lewis
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	Officer

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	06/25/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/04/2025
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	William Lewis
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)