WILLIAM HORNBUCKLE
CIK 1183302 · CEO AND PRESIDENT · last filed 2026-08-05
"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
$7.07M
Companies
4
Total Filings
153
Lifetime Open-Market Net
-$29.18M
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 |
|---|---|---|---|---|---|---|---|
| MTN | Director | — | $147.66 | — | $0 | 1 | 2026-08-05 |
| GBFH | Director | 328,269 | $21.55 | $7.07M | $0 | 6 | 2026-07-09 |
| MGM.WD | CEO AND PRESIDENT | 777,854 | — | — | -$29.85M | 138 | 2026-02-25 |
| MGM Growth Properties LLC (MGP) Delisted | Director | 39,212 | $41.64 | $1.63M | $673.7K | 8 | 2017-04-21 |
Recent Filings · Page 4 of 16
153 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 |
|---|---|---|---|---|---|
| 2022-10-21 | MGM.WD | Mixed | +6,497 | -$136.9K | EDGAR |
| 2022-10-11 | MGM.WD | Mixed | +37,055 | -$785.7K | EDGAR |
| 2022-10-05 | MGM.WD | Mixed | +10,903 | -$232.6K | EDGAR |
| 2022-09-19 | MGM.WD | Grant (A) | — | $0 | EDGAR |
| 2022-08-22 | MGM.WD | Mixed | +23,172 | -$535.6K | EDGAR |
| 2022-06-17 | MGM.WD | Grant (A) | — | $0 | EDGAR |
| 2022-04-22 | MGM.WD | Sell (S) | −10,000 | -$430.0K | EDGAR |
| 2022-04-22 | MGM.WD | Mixed | +142,820 | -$6.65M | EDGAR |
| 2022-04-05 | MGM.WD | Mixed | +182,820 | -$4.97M | EDGAR |
| 2022-03-17 | MGM.WD | Grant (A) | — | $0 | EDGAR |
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.