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Steven S. Williamson

CIK 1478582 · PRESIDENT AND CEO · last filed 2025-09-03

Steven S. Williamson is a PRESIDENT AND CEO who has filed 42 SEC Form 4 insider transactions across 3 companies since 2009. The most recent filing, for LUNG, was dated Jan 22, 2026. Across all open-market trades the lifetime net is −$1.5M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $741.0K 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.

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Disclosed Exposure

$741.0K

Companies

3

Total Filings

42

Lifetime Open-Market Net

-$1.52M

Filer Profile

Reported Address
C/O PULMONX CORPORATION
700 CHESAPEAKE DRIVE
REDWOOD CITY, CA 01730
Formerly Known As
Williamson Steve S (2009–2012)
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
LUNG PRESIDENT AND CEO 363,497 $1.85 $672.5K -$146.8K 5 2025-09-03
OM Chief Commercial Officer 21,356 $3.21 $68.6K -$671.3K 15 2024-02-16
HOLOGIC INC (HOLX) Delisted SVP, GYN Surgical 41,721 $76.01 $3.17M -$701.5K 12 2012-03-08

Recent Filings

42 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-01-22 LUNG Notice (144) −48,892 -$95.3K EDGAR
2026-01-15 LUNG Notice (144) −15,892 -$31.0K EDGAR
2026-01-14 LUNG Notice (144) −31,082 -$62.1K EDGAR
2025-09-03 LUNG Sell (S) −9,648 -$15.4K EDGAR
2025-06-04 LUNG Sell (S) −9,923 -$31.1K EDGAR
2025-03-05 LUNG Mixed +154,007 -$197.7K EDGAR
2024-08-22 LUNG Buy (P) +14,245 $97.4K EDGAR
2024-03-19 LUNG Grant (A) +205,286 $0 EDGAR
2024-02-16 OM Sell (S) −2,500 -$8.9K EDGAR
2024-02-15 OM Notice (144) −2,500 -$8.9K EDGAR
Showing 1–10 of 42
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.