Reporting owner · CIK 0001518611

Sibold William John

Visual SEC Form 4 history across 1 companies, 29 transactions and 4 filings.

PRESPresident and CEOMADRIGAL PHARMACEUTICALS, INC.
Open-market mix
Latest filingSep 11, 2026, 08:57 PM
Filings4Form 4 records
Buying$00 purchases
Selling$6.8M25 sales
Net value−$6.8MBuys minus sells
Companies13 securities
Most recentSep 11, 2026sale

Open-market buy performance

90-day forward return on this insider's open-market purchases

90d forward
Forward return is not available yet

We compute this from each buy's stock performance 90 days after the transaction. The price history is still being populated for this insider's their open-market buys, so the average and median will appear here once the daily price refresh has covered the relevant trading days.

Monthly open-market activity

Reported purchase and sale transaction counts

Buys Sells
25130-13-251Jan 25Feb 25Mar 2524Sep 26

Net value flow

Buys minus sells

Jan 25
−$531K
Feb 25
$0
Mar 25
$0
Sep 26
−$6.2M

Transaction texture

Ownership and ticket size

Average P/S size$270.8K
Median P/S size$211.5K
Direct29
Indirect0
Sep 11, 2026sale

Filing-only signals

Deterministic matches in this insider's history

Cluster Sellingpattern1Derivative Transactionfiling-context2Direct Ownershipfiling-context5Large Holdings Increaseholdings2

Latest Form 4 facts

Quick context from source filings

Latest transaction

sale at MADRIGAL PHARMACEUTICALS, INC. on Sep 11, 2026 valued at $65,565.

Review SEC filing
Latest 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 filing

Associated companies

Visual map of known reporting history

MDGLMADRIGAL PHARMACEUTICALS, INC.29 transactions · latest Sep 11, 2026, 08:57 PM
TickerInsiderRoleTypeSharesValueCodeSignals90d returnFiledTrans date
MDGLSibold William John
PRES
sale10b5-1160-$8.68MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1362-$19.6MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1505-$27.2MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1215-$11.5MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1520-$27.9MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1640-$34.3MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-11.04k-$55.7MS
Direct Ownership Large Sale Repeat Seller+1
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1644-$34.4MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1396-$21.1MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09
MDGLSibold William John
PRES
sale10b5-1512-$27.2MS
Direct Ownership Repeat Seller 10b5-1 Detected
0.0%09/1109/09

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?

This version does not calculate win rates, forward returns, benchmark-adjusted returns, or high-conviction scores.