Martina Flammer reports multiple INSM (NASDAQ: INSM) share dispositions in Form 144

Rhea-AI Filing Summary

Insmed Inc. reported Form 144 filings reporting insider sales. The filing lists sales by Martina Flammer of Common stock on 05/11/2026 (12,949 shares), 05/13/2026 (7,854 shares), 05/14/2026 (10,479 shares), 06/03/2026 (2,566 shares), and 06/05/2026 (1,858 shares).

The filing identifies these as sales under Stock Plan Activity and lists the transactions as Issuer-related on 07/06/2026. The document provides transaction dates and share counts; it does not state proceeds, prices, or remaining beneficial ownership in the excerpt provided.

Insights

Securities Compliance Lawyer

Form 144 reports multiple insider dispositions by Martina Flammer; filings show dates and share counts.

These entries list five dispositions dated between 05/11/2026 and 06/05/2026, each with an exact share count. The filing labels the activity as Stock Plan Activity and records the filer role as Issuer.

Court or enforcement outcomes are not present. Subsequent filings may disclose transaction prices, net proceeds, or post-transaction holdings if required under applicable rules.

Key Figures

Sale on 05/11/2026: 12,949 shares Sale on 05/13/2026: 7,854 shares Sale on 05/14/2026: 10,479 shares +2 more

5 metrics

Sale on 05/11/2026 12,949 shares Disposition by Martina Flammer

Sale on 05/13/2026 7,854 shares Disposition by Martina Flammer

Sale on 05/14/2026 10,479 shares Disposition by Martina Flammer

Sale on 06/03/2026 2,566 shares Disposition by Martina Flammer

Sale on 06/05/2026 1,858 shares Disposition by Martina Flammer

Key Terms

Form 144, Stock Plan Activity, Issuer

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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 | 07/06/2026 | Stock Plan Activity"

Issuer regulatory

"Stock Plan Activity | Issuer"

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Available on EDGAR 07/06/2026 - 04:21 PM Accepted by SEC EDGAR 07/06/2026 - 04:20 PM Learn about SEC filing dates

FAQ

What does the INSM Form 144 filing report?

The filing reports insider dispositions by Martina Flammer, listing five sale dates and share counts. It shows transactions on 05/11/2026, 05/13/2026, 05/14/2026, 06/03/2026, and 06/05/2026 totaling the disclosed per‑date share amounts.

How many shares did Martina Flammer sell in the June 2026 transactions?

In June 2026 the filing lists two dispositions: 2,566 shares on 06/03/2026 and 1,858 shares on 06/05/2026. The filing shows the share counts and dates but does not state sale prices or proceeds.

Are these sales labeled as plan-related or open-market in the filing?

The entries are labeled Stock Plan Activity in the excerpt and the filer role is indicated as Issuer. The filing text does not specify whether sales were open-market versus plan-directed in the provided excerpt.

Does the Form 144 excerpt disclose proceeds or post-transaction holdings for INSM?

The excerpt provides transaction dates and share counts but does not disclose sale prices, gross or net proceeds, or remaining beneficial ownership. Additional SEC filings may contain those financial details if reported.

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	12302	1352864	216752451	07/06/2026	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	07/06/2026	Stock Plan Activity	Issuer			12302	07/06/2026	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	06/05/2026	1858	192811
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	06/03/2026	2566	262418
Martina Flammer 700 US Highway 202/206 Bridgewater NJ 08807	Common	05/14/2026	10479	1231599
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)