[144] INSMED Inc SEC Filing

Rhea-AI Filing Summary

INSM filed a Form 144 notice of proposed sale of Common Stock by an affiliate. The filing lists two proposed sale dates: 05/11/2026 and 05/13/2026, showing proposed sale quantities of 12,949 shares and 7,854 shares, respectively. The record lists Martina Flammer as the selling person and shows holdings figures of 1,300,105 and 897,137 adjacent to those entries. The securities are Common Stock noted for trading on NASDAQ.

Insights

Corporate Governance Analyst

Routine Form 144 notice showing affiliate-proposed share dispositions.

The filing names Martina Flammer and records proposed sale dates 05/11/2026 and 05/13/2026

These entries appear as procedural disclosure of intended sales under resale rules; cash‑flow treatment and method of sale are not stated in the excerpt. Subsequent filings or transaction reports will show completion details.

Key Figures

Proposed sale (05/11/2026): 12,949 shares Proposed sale (05/13/2026): 7,854 shares Reported holdings adjacent to entries: 1,300,105 and 897,137

3 metrics

Proposed sale (05/11/2026) 12,949 shares listed for proposed sale on <date>05/11/2026</date>

Proposed sale (05/13/2026) 7,854 shares listed for proposed sale on <date>05/13/2026</date>

Reported holdings adjacent to entries 1,300,105 and 897,137 figures shown next to the selling-person lines in the excerpt

Key Terms

Form 144, Stock Plan Activity, Issuer

3 terms

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Stock Plan Activity financial

"Common | 05/11/2026 | Stock Plan Activity"

Issuer regulatory

"Stock Plan Activity | Issuer | | | 10479"

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	10479	1231599	216752451	05/14/2026	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	05/11/2026	Stock Plan Activity	Issuer			10479	05/11/2026	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
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/13/2026	7854	897137
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/11/2026	12949	1300105

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)