David Tsung-Hung Chao
CIK 1726418 · View on SEC EDGAR ↗
Insider
First SEC filing: Jan. 9, 2018 · Latest: Jan. 9, 2018
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 11 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
11 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Nov. 29, 2024 | WLK | S | 1,750 | $129.08 | $225,890 | 7,784 Direct | -18.36% | Disposed | -38.8% (price as of 2026-08-21) |
| Nov. 22, 2024 | WLK | S | 1,750 | $130.00 | $227,500 | 9,534 Direct | -15.51% | Disposed | -39.2% (price as of 2026-08-21) |
| Aug. 23, 2023 | WLK | S | 1,000 | $131.00 | $131,000 | 10,148 Direct | -8.97% | Disposed | -39.7% (price as of 2026-08-21) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Aug. 14, 2026 | WLK | Restricted Stock Units | Common Stock (2,184) | — | — | 2,184 | Acquired |
| Aug. 8, 2026 | WLK | Restricted Stock Units | Common Stock (2,168) | — | — | 2,168 | Disposed |
| Aug. 11, 2024 | WLK | Restricted Stock Units | Common Stock (1,136) | — | — | 1,136 | Disposed |
| Aug. 9, 2024 | WLK | Restricted Stock Units | Common Stock (1,128) | — | — | 1,128 | Acquired |
| Aug. 12, 2023 | WLK | Restricted Stock Units | Common Stock (1,446) | — | — | 1,446 | Disposed |
| Aug. 11, 2023 | WLK | Restricted Stock Units | Common Stock (1,136) | — | — | 1,136 | Acquired |
| Jan. 5, 2018 | WLK | Restricted Stock Units | Common Stock (1,090) | — | — | 1,090 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 2 holdings
Securities held when first becoming an insider, per SEC Form 3.