William Lewis
CIK 1402051 · Chair and CEO · last filed 2026-07-24
William Lewis is a Chair and CEO who has filed 151 SEC Form 4 insider transactions across 4 companies since 2010. The most recent filing, for INSM, was dated Jul 24, 2026. Across all open-market trades the lifetime net is −$120.2M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $52.6M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$52.65M
4
151
-$120.22M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| INSM | Chair and CEO | 503,682 | $104.13 | $52.45M | -$120.22M | 94 | 2026-07-24 |
| NAMSW | Director | 10,360 | $19.38 | $200.8K | $0 | 3 | 2026-01-09 |
| QURE | Director | — | $36.66 | — | $0 | 1 | 2017-01-31 |
| Aegerion Pharmaceuticals, Inc. (AEGR) Delisted | President, PFO and Treasurer | 73,960 | — | — | $0 | 1 | 2010-10-27 |
Recent Filings
151 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-07-24 | INSM | Mixed | — | -$868.0K | EDGAR |
| 2026-07-23 | INSM | Notice (144) | −10,700 | -$1.13M | EDGAR |
| 2026-07-10 | INSM | Mixed | — | -$989.2K | EDGAR |
| 2026-07-09 | INSM | Notice (144) | −10,699 | -$1.26M | EDGAR |
| 2026-06-26 | INSM | Mixed | — | -$1.68M | EDGAR |
| 2026-06-25 | INSM | Notice (144) | −21,398 | -$2.21M | EDGAR |
| 2026-06-10 | INSM | Sell (S) | −6,515 | -$612.6K | EDGAR |
| 2026-06-08 | INSM | Notice (144) | −6,515 | -$612.6K | EDGAR |
| 2026-06-05 | INSM | Sell (S) | −7,605 | -$777.8K | EDGAR |
| 2026-06-03 | INSM | Notice (144) | −7,605 | -$777.8K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.