LYTIR

Company · INSM

Insmed Incorporated

Name as listed on its exchange; filed with the SEC as INSMED Inc.

Nasdaq's symbol directory lists INSM on Nasdaq as “Insmed Incorporated - Common Stock”.

In the 12 months to Nov 8, 2026: insiders sold on 10 occasions ($45.9M); 10 planned-sale notices; 2 filings by holders of 5% or more; 1 congressional trade disclosure; 5 company reports (Form 8-K, since May 26, 2026).

All insider filings at the SEC · Appeared in No. 11

Insider purchases and sales, by month (last 12 months)Insider purchases: $0 in total; Insider sales: $45.9M in total.Jun: Insider sales $3.0MJul: Insider sales $3.7MAug: Insider sales $36.1MSep: Insider sales $3.1MDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $0Insider sales below: $45.9M
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Roger Adsett, Chief Operating Officer sold on 1 day latest Aug 10, 2026 sold $32.0M
  2. William Lewis, Chair and CEO sold on 4 days all under a 10b5-1 plan latest Jul 23, 2026 sold $5.2M
  3. Martina M. D. Flammer, Chief Medical Officer sold on 2 days all under a 10b5-1 plan latest Aug 6, 2026 sold $4.8M
  4. David R. Brennan sold on 1 day latest Sep 9, 2026 sold $3.1M
  5. SHAROKY MELVIN MD sold on 1 day latest Aug 17, 2026 sold $638K
  6. Smith Michael Alexander, Chief Legal Officer sold on 1 day all under a 10b5-1 plan latest Jun 22, 2026 sold $173K
Every trade (10)
  1. SELLDavid R. Brennan sold Sep 9, 2026 25,000 shares filing $3.1M
  2. SELLSHAROKY MELVIN MD sold Aug 17, 2026 5,000 shares filing $638K
  3. SELLRoger Adsett, Chief Operating Officer sold Aug 10, 2026 239,850 shares filing $32.0M
  4. SELLMartina M. D. Flammer, Chief Medical Officer sold Aug 6, 2026 27,173 shares 2 legs combined 10b5-1 plan (scheduled) filing $3.5M
  5. SELLWilliam Lewis, Chair and CEO sold Jul 23, 2026 10,700 shares 2 legs combined 10b5-1 plan (scheduled) filing $1.1M
  6. SELLWilliam Lewis, Chair and CEO sold Jul 9, 2026 10,699 shares 3 legs combined 10b5-1 plan (scheduled) filing $1.3M
  7. SELLMartina M. D. Flammer, Chief Medical Officer sold Jul 6, 2026 12,302 shares 2 legs combined 10b5-1 plan (scheduled) filing $1.4M
  8. SELLWilliam Lewis, Chair and CEO sold Jun 25, 2026 21,398 shares 5 legs combined 10b5-1 plan (scheduled) filing $2.2M
  9. SELLSmith Michael Alexander, Chief Legal Officer sold Jun 22, 2026 1,806 shares 10b5-1 plan (scheduled) filing $173K
  10. SELLWilliam Lewis, Chair and CEO sold Jun 8, 2026 6,515 shares 10b5-1 plan (scheduled) filing $613K

Planned sales · SEC Form 144

Notice given

A Form 144 is filed before an insider sells restricted stock. It states an intent; the sale, if it happens, appears later on a Form 4. Every recent notice

  1. Sara Bonstein filed Nov 3, 2026 Former Officer 10,261 shares planned sale date 11/03/2026 filing $1.1M
  2. Brennan David R filed Sep 10, 2026 Director 25,000 shares planned sale date 09/09/2026 filing $3.1M
  3. MELVIN SHAROKY filed Aug 17, 2026 Director 5,000 shares planned sale date 08/17/2026 filing $638K
  4. Roger Adsett filed Aug 10, 2026 Officer 239,850 shares planned sale date 08/10/2026 filing $32.0M
  5. Martina Flammer filed Aug 6, 2026 Officer 27,173 shares planned sale date 08/06/2026 filing $3.5M
  6. William Lewis filed Jul 23, 2026 Officer 10,700 shares planned sale date 07/23/2026 filing $1.1M
  7. William Lewis filed Jul 9, 2026 Officer 10,699 shares planned sale date 07/09/2026 filing $1.3M
  8. Martina Flammer filed Jul 6, 2026 Officer 12,302 shares planned sale date 07/06/2026 filing $1.4M
  9. William Lewis filed Jun 25, 2026 Officer 21,398 shares planned sale date 06/25/2026 filing $2.2M
  10. Michael Smith filed Jun 22, 2026 Officer 1,806 shares planned sale date 06/22/2026 filing $173K

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. Darwin Global Management, Ltd. filed Aug 14, 2026 Schedule 13G/A passive filing 3%
  2. FMR LLC filed Aug 6, 2026 Schedule 13G/A passive 16,127,583 shares filing 7.4%

Congress · STOCK Act

The Althing

Periodic transaction reports. Amounts are the ranges members report; the trade date is when it happened, the report can come up to 45 days later.

  1. Josh Gottheimer (D-NJ05): Sale Jun 10, 2026 reported Jul 7, 2026 one of 7 trades the member reported that day House Stocks (including ADRs) owner: joint $1,001 - $15,000

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Results of operations and financial condition filing Oct 29, 2026
  2. Departure or appointment of directors or officers; Regulation FD disclosure filing Oct 20, 2026
  3. Departure or appointment of directors or officers; Regulation FD disclosure filing Oct 5, 2026
  4. Results of operations and financial condition filing Aug 6, 2026
  5. Regulation FD disclosure filing Jul 16, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.