David Tsung-Hung Chao
CIK 1726418 · last filed 2026-08-17
"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
$2.26M
Companies
1
Total Filings
19
Lifetime Open-Market Net
-$584.4K
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 |
|---|---|---|---|---|---|---|---|
| WLK | Director | 30,503 | $74.23 | $2.26M | -$584.4K | 16 | 2026-08-17 |
Recent Filings · Page 2 of 2
19 filingsInsider 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 |
|---|---|---|---|---|---|
| 2023-08-23 | WLK | Notice (144) | −1,000 | -$131.0K | EDGAR |
| 2023-08-14 | WLK | Mixed | +1,446 | $0 | EDGAR |
| 2022-08-15 | WLK | Mixed | +1,763 | $0 | EDGAR |
| 2021-08-16 | WLK | Mixed | +2,400 | $0 | EDGAR |
| 2020-08-17 | WLK | Mixed | +2,387 | $0 | EDGAR |
| 2019-08-19 | WLK | Mixed | +1,409 | $0 | EDGAR |
| 2019-01-07 | WLK | Exer (M) | +1,090 | $0 | EDGAR |
| 2018-08-20 | WLK | Grant (A) | — | $0 | EDGAR |
| 2018-01-09 | WLK | Grant (A) | — | $0 | EDGAR |
Showing 11–19 of 19
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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.
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.