Lewis William, Chair and CEO of INSM, has demonstrated a consistent pattern of selling shares in the company over recent months, with no recent purchases recorded in SEC filings. Since January 2026, William has executed 17 sales of INSM stock totaling over $5.8 million, with transactions clustered in February and March 2026. The largest single sale occurred on February 9, 2026, when he disposed of shares worth $1.07 million, followed by multiple sales on March 19, 2026, including two transactions valued at $653,250 and $650,696. Smaller but repeated sales occurred throughout the period, often accompanied by smaller "M"-coded transactions (likely option exercises or other non-open-market dispositions) consistently valued at $76,190 and $190,649.
William's trading history shows a pronounced selling bias, with total lifetime sales exceeding $20.7 million across 81 transactions compared to just $2.4 million in buys—all prior to 2026. The recent activity suggests an acceleration in dispositions, with March 2026 alone accounting for over $1.5 million in sales. All transactions involve INSM, indicating concentrated exposure to this single holding. The pattern aligns with routine executive stock liquidation, though the frequency and size of recent sales—particularly the multi-million-dollar dispositions in February and March—merit attention given William's leadership role. No purchases have accompanied these sales, reinforcing the directional trend.
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