Insmed insider plans sale of 10,700 shares

Insmed Inc. (symbol INSM) insider William Lewis has filed to sell 10,700 shares of common stock, to be handled through Merrill Lynch from its Washington, DC office, with the transaction dated July 23, 2026 and categorized as Stock Plan Activity by the issuer.

Rhea-AI Filing Summary

Insmed Inc. (symbol INSM) insider William Lewis has filed to sell 10,700 shares of common stock, to be handled through Merrill Lynch from its Washington, DC office, with the transaction dated July 23, 2026 and categorized as Stock Plan Activity by the issuer.

The filing also lists prior sales of Insmed common shares by William Lewis over the preceding three months, including transactions on May 4, May 13, May 18, June 3, June 8, June 25, and July 9, 2026, with individual sale sizes ranging from 6,515 to 25,564 shares.

Key Figures

Planned shares to be sold: 10,700 shares Shares sold on May 4, 2026: 10,699 shares Shares sold on May 13, 2026: 13,283 shares +5 more

8 metrics

Planned shares to be sold 10,700 shares Common stock transaction dated July 23, 2026 categorized as Stock Plan Activity

Shares sold on May 4, 2026 10,699 shares Common stock sale by William Lewis during past 3 months

Shares sold on May 13, 2026 13,283 shares Common stock sale by William Lewis during past 3 months

Shares sold on May 18, 2026 25,564 shares Common stock sale by William Lewis during past 3 months

Shares sold on June 3, 2026 7,605 shares Common stock sale by William Lewis during past 3 months

Shares sold on June 8, 2026 6,515 shares Common stock sale by William Lewis during past 3 months

Shares sold on June 25, 2026 21,398 shares Common stock sale by William Lewis during past 3 months

Shares sold on July 9, 2026 10,699 shares Common stock sale by William Lewis during past 3 months

Key Terms

Stock Plan Activity, Securities To Be Sold, Securities Sold During The Past 3 Months

3 terms

Stock Plan Activity financial

"Common | 07/23/2026 | Stock Plan Activity | Issuer"

Securities To Be Sold regulatory

"144: Securities To Be Sold"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

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

What does the INSM insider William Lewis plan to sell under this filing?

William Lewis plans to sell 10,700 shares of Insmed common stock. The transaction is dated July 23, 2026 and is categorized as Stock Plan Activity handled through Merrill Lynch.

How is the planned INSM share sale by William Lewis being executed?

The planned sale of 10,700 Insmed common shares is to be executed through Merrill Lynch, from its Washington, DC office, with the transaction dated July 23, 2026 as Stock Plan Activity.

What prior INSM stock sales by William Lewis are disclosed in the last three months?

The filing lists multiple prior Insmed sales by William Lewis from May 4 to July 9, 2026, with individual transactions of 6,515 to 25,564 common shares on seven separate dates.

On which recent dates did William Lewis sell INSM shares before this new planned sale?

Recent sales of Insmed shares by William Lewis occurred on May 4, May 13, May 18, June 3, June 8, June 25, and July 9, 2026, each involving blocks of common stock.

What type of transaction is the July 23, 2026 INSM sale by William Lewis?

The July 23, 2026 transaction for 10,700 Insmed common shares is described as Stock Plan Activity by the issuer, indicating it relates to an equity compensation or stock plan.

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

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Available on EDGAR 07/23/2026 - 04:39 PM Accepted by SEC EDGAR 07/23/2026 - 04:38 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	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
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	10700	1134867	216752451	07/23/2026	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	07/23/2026	Stock Plan Activity	Issuer			10700	07/23/2026	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	07/09/2026	10699	1256029
William Lewis 700 US Highway 202/206 Bridgewater NJ 08807	Common	06/25/2026	21398	2210653
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

144: Remarks and Signature

Remarks
Date of Notice	07/23/2026
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)