13F Pro

SEC Form 4 reporting owner

Lewis William

Lewis William has filed 101 Form 4 transactions reported between December 18, 2025 and July 23, 2026, as Chair and CEO of INSMED Inc and a reporting owner of NewAmsterdam Pharma Co N.V..

Name as filed: Lewis William

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$30.5M
69 lines
Companies
2
with Form 4 filings
Latest transaction
Jul 23, 2026
transaction date

Roles and reported holdings

  • INSMINSMED Inc
    Dec 18, 2025 – Jul 23, 2026

    Chair and CEO

    Held directly259,058 sh as of Jul 23, 2026 · Form 4

    24 months: $30.5M sold

  • NAMSNewAmsterdam Pharma Co N.V.
    Jan 7, 2026

    Reporting owner

    No common-stock holding reported on a purchase, sale, gift or withholding line.

Transaction history

All 101 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Jul 23, 2026INSMChair and CEOOpen-market saleCode S · direct5,872$625K@ $106.43Form 4
Jul 23, 2026INSMChair and CEOOpen-market saleCode S · direct4,828$510K@ $105.62Form 4
Jul 23, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Jul 23, 2026INSMChair and CEOOption exerciseCode M · direct6,260$191K@ $30.46Form 4
Jul 9, 2026INSMChair and CEOOpen-market saleCode S · direct3,359$398K@ $118.52Form 4
Jul 9, 2026INSMChair and CEOOpen-market saleCode S · direct2,335$275K@ $117.62Form 4
Jul 9, 2026INSMChair and CEOOpen-market saleCode S · direct5,005$583K@ $116.55Form 4
Jul 9, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Jul 9, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Jun 25, 2026INSMChair and CEOOpen-market saleCode S · direct1,292$137K@ $106.27Form 4
Jun 25, 2026INSMChair and CEOOpen-market saleCode S · direct2,456$259K@ $105.27Form 4
Jun 25, 2026INSMChair and CEOOpen-market saleCode S · direct3,723$388K@ $104.28Form 4
Jun 25, 2026INSMChair and CEOOpen-market saleCode S · direct1,836$189K@ $103.10Form 4
Jun 25, 2026INSMChair and CEOOpen-market saleCode S · direct12,091$1.2M@ $102.34Form 4
Jun 25, 2026INSMChair and CEOOption exerciseCode M · direct8,880$152K@ $17.16Form 4
Jun 25, 2026INSMChair and CEOOption exerciseCode M · direct12,518$381K@ $30.46Form 4
Jun 8, 2026INSMChair and CEOOpen-market saleCode S · direct6,515$613K@ $94.03Form 4
Jun 3, 2026INSMChair and CEOOpen-market saleCode S · direct7,605$778K@ $102.27Form 4
May 18, 2026INSMChair and CEOOpen-market saleCode S · direct7,975$853K@ $106.97Form 4
May 18, 2026INSMChair and CEOOpen-market saleCode S · direct11,836$1.3M@ $106.39Form 4
May 18, 2026INSMChair and CEOOpen-market saleCode S · direct5,753$606K@ $105.32Form 4
May 18, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
May 18, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
May 13, 2026INSMChair and CEOOpen-market saleCode S · direct13,283$1.5M@ $116.18Form 4
May 4, 2026INSMChair and CEOOpen-market saleCode S · direct381$53K@ $139.60Form 4
May 4, 2026INSMChair and CEOOpen-market saleCode S · direct1,247$173K@ $139.09Form 4
May 4, 2026INSMChair and CEOOpen-market saleCode S · direct2,721$375K@ $137.86Form 4
May 4, 2026INSMChair and CEOOpen-market saleCode S · direct5,318$729K@ $137.01Form 4
May 4, 2026INSMChair and CEOOpen-market saleCode S · direct599$81K@ $135.18Form 4
May 4, 2026INSMChair and CEOOpen-market saleCode S · direct433$58K@ $134.18Form 4
May 4, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
May 4, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Apr 16, 2026INSMChair and CEOOpen-market saleCode S · direct825$120K@ $145.79Form 4
Apr 16, 2026INSMChair and CEOOpen-market saleCode S · direct2,255$326K@ $144.66Form 4
Apr 16, 2026INSMChair and CEOOpen-market saleCode S · direct5,373$773K@ $143.81Form 4
Apr 16, 2026INSMChair and CEOOpen-market saleCode S · direct2,246$321K@ $142.99Form 4
Apr 16, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Apr 16, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Apr 6, 2026INSMChair and CEOOpen-market saleCode S · direct1,434$235K@ $164.01Form 4
Apr 6, 2026INSMChair and CEOOpen-market saleCode S · direct8,478$1.4M@ $163.23Form 4
Apr 6, 2026INSMChair and CEOOpen-market saleCode S · direct787$127K@ $161.73Form 4
Apr 6, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Apr 6, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Mar 19, 2026INSMChair and CEOOpen-market saleCode S · direct4,533$653K@ $144.11Form 4
Mar 19, 2026INSMChair and CEOOpen-market saleCode S · direct4,537$651K@ $143.42Form 4
Mar 19, 2026INSMChair and CEOOpen-market saleCode S · direct1,629$232K@ $142.17Form 4
Mar 19, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Mar 19, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Mar 5, 2026INSMChair and CEOOpen-market saleCode S · direct2,128$314K@ $147.54Form 4
Mar 5, 2026INSMChair and CEOOpen-market saleCode S · direct3,899$572K@ $146.66Form 4
Mar 5, 2026INSMChair and CEOOpen-market saleCode S · direct2,589$376K@ $145.27Form 4
Mar 5, 2026INSMChair and CEOOpen-market saleCode S · direct2,083$300K@ $144.23Form 4
Mar 5, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Mar 5, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Feb 19, 2026INSMChair and CEOOpen-market saleCode S · direct1,030$158K@ $153.38Form 4
Feb 19, 2026INSMChair and CEOOpen-market saleCode S · direct2,377$361K@ $151.92Form 4
Feb 19, 2026INSMChair and CEOOpen-market saleCode S · direct3,413$516K@ $151.12Form 4
Feb 19, 2026INSMChair and CEOOpen-market saleCode S · direct1,891$284K@ $150.10Form 4
Feb 19, 2026INSMChair and CEOOpen-market saleCode S · direct1,988$297K@ $149.17Form 4
Feb 19, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Feb 19, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Feb 9, 2026INSMChair and CEOOpen-market saleCode S · direct1,287$192K@ $148.83Form 4
Feb 9, 2026INSMChair and CEOOpen-market saleCode S · direct7,221$1.1M@ $148.02Form 4
Feb 9, 2026INSMChair and CEOOpen-market saleCode S · direct4,888$719K@ $147.17Form 4
Feb 9, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Feb 9, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Feb 3, 2026INSMChair and CEOOpen-market saleCode S · direct3,009$470K@ $156.34Form 4
Jan 20, 2026INSMChair and CEOOpen-market saleCode S · direct254$41K@ $160.70Form 4
Jan 20, 2026INSMChair and CEOOpen-market saleCode S · direct2,229$356K@ $159.85Form 4
Jan 20, 2026INSMChair and CEOOpen-market saleCode S · direct5,967$949K@ $158.99Form 4
Jan 20, 2026INSMChair and CEOOpen-market saleCode S · direct1,243$197K@ $158.37Form 4
Jan 20, 2026INSMChair and CEOOpen-market saleCode S · direct1,006$158K@ $156.80Form 4
Jan 20, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Jan 20, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Jan 12, 2026INSMChair and CEOOpen-market saleCode S · direct315$55K@ $174.86Form 4
Jan 12, 2026INSMChair and CEOOpen-market saleCode S · direct297$51K@ $171.31Form 4
Jan 12, 2026INSMChair and CEOOpen-market saleCode S · direct160$27K@ $170.24Form 4
Jan 12, 2026INSMChair and CEOOpen-market saleCode S · direct6,996$1.2M@ $169.57Form 4
Jan 12, 2026INSMChair and CEOOpen-market saleCode S · direct7,176$1.2M@ $168.63Form 4
Jan 12, 2026INSMChair and CEOOpen-market saleCode S · direct3,974$667K@ $167.73Form 4
Jan 12, 2026INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4
Jan 12, 2026INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Jan 8, 2026INSMChair and CEOOpen-market saleCode S · direct3,223$561K@ $174.17Form 4
Jan 7, 2026INSMChair and CEOOpen-market saleCode S · direct2,357$413K@ $175.07Form 4
Jan 7, 2026NAMSGrant or awardCode A · direct15,300—Form 4
Jan 7, 2026NAMSGrant or awardCode A · direct3,400—Form 4
Jan 6, 2026INSMChair and CEOOpen-market saleCode S · direct4,096$710K@ $173.33Form 4
Jan 2, 2026INSMChair and CEOGrant or awardCode A · direct110,400—Form 4
Jan 2, 2026INSMChair and CEOGrant or awardCode A · direct21,172—Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct51$9K@ $171.20Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct362$62K@ $170.26Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct1,938$329K@ $169.58Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct2,175$367K@ $168.54Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct1,431$239K@ $167.29Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct1,783$297K@ $166.60Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct697$115K@ $165.21Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct447$73K@ $164.24Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct1,465$239K@ $163.19Form 4
Dec 18, 2025INSMChair and CEOOpen-market saleCode S · direct350$57K@ $162.26Form 4
Dec 18, 2025INSMChair and CEOOption exerciseCode M · direct6,259$191K@ $30.46Form 4
Dec 18, 2025INSMChair and CEOOption exerciseCode M · direct4,440$76K@ $17.16Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.