Insider plans sale of 4,096 company shares

A shareholder filed a Form 144 indicating an intent to sell 4,096 shares of common stock through Merrill Lynch on or about 01/06/2026, with the stock listed on NASDAQ.

Accepted by SEC EDGAR 01/06/2026 - 04:20 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

A shareholder filed a Form 144 indicating an intent to sell 4,096 shares of common stock through Merrill Lynch on or about 01/06/2026, with the stock listed on NASDAQ. These shares were acquired on 01/04/2026 through stock plan activity from the issuer, with the same date listed as the payment date. The filing notes that common shares outstanding were 213,273,469, providing a baseline for the company’s share count.

Over the prior three months, the same seller, William Lewis, reported two additional sales of common stock: 10,699 shares on 12/18/2025 for gross proceeds of 1,786,437, and another 10,699 shares on 12/04/2025 for gross proceeds of 2,199,583. By signing the notice, the seller represents that they do not know of any material adverse information about the issuer’s current or prospective operations that has not been publicly disclosed.

FAQ

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

What does this Form 144 filing for INSM report?

The filing reports a planned sale of 4,096 shares of common stock on or about 01/06/2026 through Merrill Lynch, with the shares listed on NASDAQ.

How many INSM shares has William Lewis sold recently?

Over the past three months, William Lewis reported two sales of common stock: 10,699 shares on 12/18/2025 and 10,699 shares on 12/04/2025.

What were the gross proceeds from William Lewis’s recent INSM share sales?

The filing shows gross proceeds of 1,786,437 from the 12/18/2025 sale and 2,199,583 from the 12/04/2025 sale of common stock.

How were the 4,096 INSM shares to be sold acquired?

The 4,096 common shares were acquired on 01/04/2026 via stock plan activity from the issuer, with the same date listed as the payment date.

How many INSM common shares are outstanding according to the filing?

The Form 144 indicates that 213,273,469 common shares were outstanding, giving context for the company’s overall share count.

What representation does the seller make about inside information in this Form 144?

By signing, 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.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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	4096	709959	213273469	01/06/2026	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	01/04/2026	Stock Plan Activity	Issuer			4096	01/04/2026	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	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	01/06/2026
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)