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INSMINSMED Inc

William Lewis

Chair and CEO, Director at INSMED Inc, as of Jul 24, 2026Sold $32.8M of stock in the past 12 months: 86% under a disclosed plan and 14% to cover taxes.

Updated Oct 15, 2026 from SEC filings · covers Oct 16, 2025 to Oct 15, 2026
1.06M
shares held after the latest filing, INSMED Inc
Vested shares reported on Forms 3, 4 and 5 only. Not the insider's whole wealth.
237K
shares sold, past 12 months
22
days with sales
$3.2M
largest single day, Jan 12, 2026
2
companies filed for

Share of stake sold at INSMED Inc is not shown: most of their shares vested during the period, so a percentage would mislead. Why

Selling by month

Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.

Disclosed planTo cover taxesOne dollar scale for every month; the tallest bar is labeled
OctNovDec 2025: $4.0M under a disclosed planDecJan 2026: $4.9M under a disclosed planJan 2026: $1.7M to cover taxes$6.6MJanFeb 2026: $3.6M under a disclosed planFeb 2026: $470K to cover taxesFebMar 2026: $3.1M under a disclosed planMarApr 2026: $3.3M under a disclosed planAprMay 2026: $4.2M under a disclosed planMay 2026: $1.5M to cover taxesMayJun 2026: $2.8M under a disclosed planJun 2026: $778K to cover taxesJunJul 2026: $2.4M under a disclosed planJulAugSepOct

Pattern

What the filings show, past 12 months. Nothing here rates or predicts.

Roles from filings

Every company we track where this person has filed, newest filing first.

CompanyTitleFirst filingLatest filing
INSMED Inc (INSM)Chair and CEO, DirectorSep 12, 2012Jul 24, 2026
NewAmsterdam Pharma Co N.V. (NAMS)DirectorJan 8, 2024Jan 9, 2026

Also a director at

NewAmsterdam Pharma Co N.V. (NAMS)

Recent filings

The last 5 days with transactions, newest first, one line per trade date. Each number links to an SEC filing.

This page shows only what this person reported on SEC ownership filings. See the methodology. Spotted something wrong? Report an error.