Lewis T Williams
CIK 1475714 · Executive Chairman · last filed 2026-02-18
Lewis T Williams is an Executive Chairman who has filed 69 SEC Form 4 insider transactions across 6 companies since 2009. The most recent filing, for PTGX, was dated Feb 18, 2026. Across all open-market trades the lifetime net is −$16.5M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.8M 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.
$2.84M
6
69
-$16.49M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| PTGX | Director | 25,825 | $109.78 | $2.84M | -$1.48M | 11 | 2026-02-18 |
| Arcellx, Inc. (ACLX) Delisted | Director | 2,095,114 | $115.07 | $241.08M | $0 | 1 | 2022-02-09 |
| Neurogene Inc. (NLTX) Delisted | Director | — | $13.96 | — | $0 | 3 | 2021-05-13 |
| FIVE PRIME THERAPEUTICS, INC. (XLRN) Delisted | Director | 455,336 | $178.75 | $81.39M | -$1.51M | 19 | 2019-09-04 |
| FIVE PRIME THERAPEUTICS, INC. (FPRX) Delisted | President, CEO and Chairman | 421,828 | $38.00 | $16.03M | -$13.49M | 20 | 2016-05-13 |
| BECKMAN COULTER INC (BEC) Delisted | Director | 1,372 | — | — | $0 | 14 | 2011-06-22 |
Recent Filings
69 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-02-18 | PTGX | Mixed | — | -$1.29M | EDGAR |
| 2026-01-06 | PTGX | Grant (A) | +2,695 | $0 | EDGAR |
| 2025-01-06 | PTGX | Grant (A) | +5,130 | $0 | EDGAR |
| 2024-01-04 | PTGX | Grant (A) | — | $0 | EDGAR |
| 2023-01-18 | PTGX | Grant (A) | — | $0 | EDGAR |
| 2022-05-27 | PTGX | Grant (A) | — | $0 | EDGAR |
| 2022-02-09 | Arcellx, Inc. (ACLX) Delisted | Conv (C) | +2,095,114 | $0 | EDGAR |
| 2021-05-28 | PTGX | Grant (A) | — | $0 | EDGAR |
| 2021-05-13 | Neurogene Inc. (NLTX) Delisted | Grant (A) | — | $0 | EDGAR |
| 2020-05-29 | PTGX | Grant (A) | — | $0 | EDGAR |