Reporting owner · CIK 0001518611
Sibold William John
SEC Form 4 history across 1 companies, 24 transactions and 1 filings.
PRESPresident and CEOMADRIGAL PHARMACEUTICALS, INC.
Open-market transaction mix0% buys0 buys · 24 sales
Available history · Sep 09, 2026 – Sep 11, 2026
Latest insider transactions
Form 4 filings from available history.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$65.5kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$414kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$837kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$652kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$199kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$371kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$86.0kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$116kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$56.6kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$31.9kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$86.8kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$196kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$272kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$115kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$279kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$343kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$557kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$344kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$211kView disclosure → | |
MDGLMADRIGAL PHARMACEUTICALS, INC. | Sibold William JohnPRES | S · sale10b5-1 detectedSEC filing ↗ | -$272kView disclosure → |
Latest Form 4 facts
Quick context from source filings
Latest open-market transaction
sale at MADRIGAL PHARMACEUTICALS, INC. on Sep 11, 2026 valued at $65,565.
Review SEC filingLatest buy
No open-market insider purchase is available.
Latest sale
sale at MADRIGAL PHARMACEUTICALS, INC. on Sep 11, 2026 valued at $65,565.
Review SEC filingMonthly open-market activity
Last 1 reported months · purchases and sales
View exact monthly values
| Month | Purchases | Sales | Buy value | Sale value | Net value |
|---|---|---|---|---|---|
| Sep 2026 | 0 | 24 | $0.00 | $6,239,198.14 | -$6,239,198.14 |
Net value is disclosed purchases minus sales, not profit. A dash means the value is unavailable.
Ownership and transaction size
Ownership and ticket size
Average P/S size$260K
Median P/S size$205.4K
Direct24
Indirect0
Sep 11, 2026sale
Filing-only signals
Deterministic matches in this insider's history
No filing-only signal badges matched this history.
Associated companies
Companies in the disclosed reporting history
Open-market buy performance
90-day forward return on this insider's open-market purchases
No open-market purchases in available history
A 90-day purchase return requires an open-market buy. No eligible purchases are recorded in this history.
Disclosed ownership
How reported shareholdings evolved
Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.
24 observations · Sep 9, 2026 – Sep 11, 2026. Window ends at the latest available report, not today.
Selected observation · Sep 11, 2026197,746 shares reported
Inspect transaction View exact observations and source transactions
| Transaction date | Shares held after | Filed | Source |
|---|---|---|---|
| Sep 9, 2026 | 209,198 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 208,851 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 208,329 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 207,961 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 207,449 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 207,053 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 206,409 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 205,369 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 204,729 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 204,209 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 203,994 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 203,489 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 203,127 | Sep 11, 2026 | View transaction |
| Sep 9, 2026 | 202,967 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 202,907 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 202,801 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 202,583 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 202,423 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 201,736 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 201,368 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 200,166 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 198,627 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 197,866 | Sep 11, 2026 | View transaction |
| Sep 11, 2026 | 197,746 | Sep 11, 2026 | View transaction |
Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.
Sibold William John Insider Activity FAQ
SEC Form 4 context
Who is Sibold William John?
Sibold William John is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001518611.
Which companies has Sibold William John reported transactions for?
MADRIGAL PHARMACEUTICALS, INC.
When was Sibold William John's latest insider buy?
No open-market insider purchase is available for this period.
When was Sibold William John's latest insider sale?
sale at MADRIGAL PHARMACEUTICALS, INC. on Sep 11, 2026 valued at $65,565.
Where can I see the original SEC filings?
Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.
Are performance metrics included?
The profile shows average and median 90-day stock returns after open-market purchases when price coverage is available. These are unadjusted stock returns, not realized trading gains. Win rates, benchmark-adjusted returns and conviction scores are not calculated.