Sibold William John
Director · Officer · MDGL
As of 2026-09-27, Sibold William John has 57 Form 4 transactions on record across 1 company — 46 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in September in multiple years since 2024 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
- Direct $102.1M
- Indirect $0
| MDGL | direct | 197,746 sh | $102.1M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-11 | MDGL | Sale | 1,539 @ $544.02 | $837K | −0.8% of holding | 198,627 | Form 4 |
| 2026-09-11 | MDGL | Sale | 1,202 @ $542.60 | $652K | −0.6% of holding | 200,166 | Form 4 |
| 2026-09-11 | MDGL | Sale | 761 @ $544.83 | $415K | −0.4% of holding | 197,866 | Form 4 |
| 2026-09-11 | MDGL | Sale | 687 @ $540.59 | $371K | −0.3% of holding | 201,736 | Form 4 |
| 2026-09-11 | MDGL | Sale | 368 @ $541.64 | $199K | −0.2% of holding | 201,368 | Form 4 |
| 2026-09-11 | MDGL | Sale | 218 @ $535.94 | $117K | −0.1% of holding | 202,583 | Form 4 |
| 2026-09-11 | MDGL | Sale | 160 @ $537.62 | $86K | −0.1% of holding | 202,423 | Form 4 |
| 2026-09-11 | MDGL | Sale | 120 @ $546.38 | $66K | −0.1% of holding | 197,746 | Form 4 |
| 2026-09-11 | MDGL | Sale | 106 @ $534.06 | $57K | −0.1% of holding | 202,801 | Form 4 |
| 2026-09-11 | MDGL | Sale | 60 @ $533.09 | $32K | −0.0% of holding | 202,907 | Form 4 |
| 2026-09-09 | MDGL | Sale | 1,040 @ $536.11 | $558K | −0.5% of holding | 205,369 | Form 4 |
| 2026-09-09 | MDGL | Sale | 644 @ $535.27 | $345K | −0.3% of holding | 206,409 | Form 4 |
| 2026-09-09 | MDGL | Sale | 640 @ $537.17 | $344K | −0.3% of holding | 204,729 | Form 4 |
| 2026-09-09 | MDGL | Sale | 520 @ $538.30 | $280K | −0.3% of holding | 204,209 | Form 4 |
| 2026-09-09 | MDGL | Sale | 522 @ $530.23 | $277K | −0.2% of holding | 208,329 | Form 4 |
| 2026-09-09 | MDGL | Sale | 512 @ $533.09 | $273K | −0.2% of holding | 207,449 | Form 4 |
| 2026-09-09 | MDGL | Sale | 505 @ $540.19 | $273K | −0.2% of holding | 203,489 | Form 4 |
| 2026-09-09 | MDGL | Sale | 396 @ $534.20 | $212K | −0.2% of holding | 207,053 | Form 4 |
| 2026-09-09 | MDGL | Sale | 362 @ $541.65 | $196K | −0.2% of holding | 203,127 | Form 4 |
| 2026-09-09 | MDGL | Sale | 368 @ $531.99 | $196K | −0.2% of holding | 207,961 | Form 4 |
| 2026-09-09 | MDGL | Sale | 347 @ $529.27 | $184K | −0.2% of holding | 208,851 | Form 4 |
| 2026-09-09 | MDGL | Sale | 215 @ $539.03 | $116K | −0.1% of holding | 203,994 | Form 4 |
| 2026-09-09 | MDGL | Sale | 160 @ $542.55 | $87K | −0.1% of holding | 202,967 | Form 4 |
| 2026-09-09 | MDGL | Sale | 131 @ $527.88 | $69K | −0.1% of holding | 209,198 | Form 4 |
| 2026-07-20 | MDGL | Sale | 680 @ $547.70 | $372K | −0.3% of holding | 209,810 | Form 4 |
| 2026-07-20 | MDGL | Sale | 545 @ $544.71 | $297K | −0.3% of holding | 211,034 | Form 4 |
| 2026-07-20 | MDGL | Sale | 280 @ $555.05 | $155K | −0.1% of holding | 209,329 | Form 4 |
| 2026-07-20 | MDGL | Sale | 275 @ $545.71 | $150K | −0.1% of holding | 210,759 | Form 4 |
| 2026-07-20 | MDGL | Sale | 269 @ $547.08 | $147K | −0.1% of holding | 210,490 | Form 4 |
| 2026-07-20 | MDGL | Sale | 153 @ $550.01 | $84K | −0.1% of holding | 209,610 | Form 4 |
| 2026-07-20 | MDGL | Sale | 140 @ $542.75 | $76K | −0.1% of holding | 211,689 | Form 4 |
| 2026-07-20 | MDGL | Sale | 110 @ $543.79 | $60K | −0.1% of holding | 211,579 | Form 4 |
| 2026-07-20 | MDGL | Sale | 47 @ $548.87 | $26K | −0.0% of holding | 209,763 | Form 4 |
| 2026-07-20 | MDGL | Sale | 1 @ $550.72 | $551 | −0.0% of holding | 209,609 | Form 4 |
| 2026-03-06 | MDGL | Sale | 1,663 @ $431.94 | $718K | −1.0% of holding | 161,829 | Form 4 |
| 2026-01-26 | MDGL | Sale | 1,577 @ $492.42 | $777K | −1.1% of holding | 148,497 | Form 4 |
| 2025-12-04 | MDGL | Sale | 2,400 @ $575.34 | $1.4M | −1.6% of holding | 150,074 | Form 4 |
| 2025-09-09 | MDGL | Sale | 7,279 @ $445.63 | $3.2M | −6.6% of holding | 102,474 | Form 4 |
| 2025-08-21 | MDGL | Sale | 6,485 @ $400.03 | $2.6M | −5.5% of holding | 110,884 | Form 4 |
| 2025-08-21 | MDGL | Sale | 1,131 @ $401.00 | $454K | −1.0% of holding | 109,753 | Form 4 |
| 2025-01-24 | MDGL | Sale | 1,584 @ $335.24 | $531K | −2.8% of holding | 54,303 | Form 4 |
| 2024-09-09 | MDGL | Sale | 6,363 @ $243.83 | $1.6M | −10.2% of holding | 55,887 | Form 4 |
15 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-07-17 | MDGL | Option exercise | 50,000 | 0 | Form 4 |
| 2026-07-17 | MDGL | Option exercise | 50,000 | 211,829 | Form 4 |
| 2026-07-17 | MDGL | Option exercise | 50,000 | 211,829 | Form 4 |
| 2026-03-04 | MDGL | Award / grant | 18,743 | 18,743 | Form 4 |
| 2026-03-04 | MDGL | Award / grant | 14,995 | 163,492 | Form 4 |
| 2025-12-03 | MDGL | Option exercise | 50,000 | 0 | Form 4 |
| 2025-12-03 | MDGL | Option exercise | 50,000 | 152,474 | Form 4 |
| 2025-12-03 | MDGL | Option exercise | 50,000 | 152,474 | Form 4 |
| 2025-12-03 | MDGL | Option exercise | 50,000 | 0 | Form 4 |
| 2025-03-05 | MDGL | Award / grant | 22,009 | 22,009 | Form 4 |
| 2025-03-05 | MDGL | Award / grant | 13,066 | 117,369 | Form 4 |
| 2025-02-27 | MDGL | Option exercise | 50,000 | 0 | Form 4 |
| 2025-02-27 | MDGL | Option exercise | 50,000 | 0 | Form 4 |
| 2025-02-27 | MDGL | Option exercise | 50,000 | 104,303 | Form 4 |
| 2025-02-27 | MDGL | Option exercise | 50,000 | 104,303 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.