ROBERT L CLARK
CIK 1479324 · last filed 2026-05-21
"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
$31.2K
Companies
1
Total Filings
141
Lifetime Open-Market Net
$24.6K
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 |
|---|---|---|---|---|---|---|---|
| MTX | Director | 400 | $78.12 | $31.2K | $24.6K | 141 | 2026-05-21 |
Recent Filings · Page 4 of 15
141 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-12-10 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-10-05 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-09-13 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-07-06 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-06-21 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-05-21 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-04-05 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-03-15 | MTX | Grant (A) | — | $0 | EDGAR |
| 2021-01-05 | MTX | Grant (A) | — | $0 | EDGAR |
| 2020-12-14 | MTX | Grant (A) | — | $0 | EDGAR |
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.