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William John Sibold

Insider · President and CEO · MDGL

William John Sibold files insider transactions with the SEC as a president and ceo of Madrigal Pharmaceuticals. We hold 5 disclosed purchases and sales filed since 5 May 2011, 3 of them in the last 90 days.

  • Files for 2 companiesMDGL, AVNR
  • Disclosed buys and sells5 in all, 3 in the last 90 days
  • Last disclosure11 September 2026

Positions held

2 posts we hold — a term names its own dates; a run of filings only says when they filed
  • Filed 11 September 2023 — 11 September 2026President and CEO · Madrigal Pharmaceuticals 61 Form 4 lines · source: SEC Form 4
  • Filed 3 May 2011 — 3 May 2011Other role · Avanir Pharmaceuticals 2 Form 4 lines · source: SEC Form 4

Every transaction

63 transactions from SEC Form 4 — one row each, sort any column, open a row for the filing
63 of 63 shown
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals60 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals106 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals218 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals160 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals687 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals368 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1,202 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1,539 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals761 sharesup +0.0%up +0.0%
11 Sep 202611 Sep 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals120 sharesup +0.0%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals131 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals520 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals215 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals505 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals362 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals160 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals347 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals522 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals368 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals512 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals396 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals644 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals1,040 sharesdown −2.2%up +0.0%
9 Sep 202611 Sep 2026SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals640 sharesdown −2.2%up +0.0%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1 sharedown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals280 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals140 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals110 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals545 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals275 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals269 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals680 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals47 sharesdown −0.2%down −0.2%
20 Jul 202620 Jul 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals153 sharesdown −0.2%down −0.2%
17 Jul 202620 Jul 2026SEC Form 43 dexercised options overnot a tradeMadrigal Pharmaceuticals50,000 sharesdown −3.4%down −0.2%
17 Jul 202620 Jul 2026SEC Form 43 dexercised options overnot a tradeMadrigal Pharmaceuticalsderivative50,000 sharesdown −3.4%down −0.2%
6 Mar 20266 Mar 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1,663 sharesup +23.5%up +23.5%
6 Mar 20266 Mar 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1,663 sharesup +23.5%up +23.5%
4 Mar 20266 Mar 2026SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticals14,995 sharesup +22.9%up +23.5%
4 Mar 20266 Mar 2026SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticalsderivative18,743 sharesup +22.9%up +23.5%
4 Mar 20266 Mar 2026SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticalsderivative18,743 sharesup +22.9%up +23.5%
4 Mar 20266 Mar 2026SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticals14,995 sharesup +22.9%up +23.5%
26 Jan 202626 Jan 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1,577 sharesup +7.1%up +7.1%
26 Jan 202626 Jan 2026SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1,577 sharesup +7.1%up +7.1%
4 Dec 20254 Dec 2025SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals2,400 sharesdown −8.8%down −8.8%
3 Dec 20254 Dec 2025SEC Form 41 dexercised options overnot a tradeMadrigal Pharmaceuticalsderivative50,000 sharesdown −7.8%down −8.8%
3 Dec 20254 Dec 2025SEC Form 41 dexercised options overnot a tradeMadrigal Pharmaceuticals50,000 sharesdown −7.8%down −8.8%
9 Sep 20259 Sep 2025SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals7,279 sharesup +19.1%up +19.1%
21 Aug 202521 Aug 2025SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals6,485 sharesup +31.3%up +31.3%
21 Aug 202521 Aug 2025SEC Form 40 dsold on the open marketMadrigal Pharmaceuticals1,131 sharesup +31.3%up +31.3%
5 Mar 20257 Mar 2025SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticalsderivative22,009 sharesup +53.9%up +61.3%
5 Mar 20257 Mar 2025SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticals13,066 sharesup +53.9%up +61.3%
27 Feb 202528 Feb 2025SEC Form 41 dexercised options overnot a tradeMadrigal Pharmaceuticalsderivative50,000 sharesup +59.2%up +56.6%
27 Feb 202528 Feb 2025SEC Form 41 dexercised options overnot a tradeMadrigal Pharmaceuticals50,000 sharesup +59.2%up +56.6%
24 Jan 202527 Jan 2025SEC Form 43 dsold on the open marketMadrigal Pharmaceuticals1,584 sharesup +62.9%up +71.9%
9 Sep 202411 Sep 2024SEC Form 42 dsold on the open marketMadrigal Pharmaceuticals6,363 sharesup +123.9%up +129.4%
23 Jan 202425 Jan 2024SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticalsderivative18,459 sharesup +133.4%up +132.2%
23 Jan 202425 Jan 2024SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticalsderivative12,250 sharesup +133.4%up +132.2%
23 Jan 202425 Jan 2024SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticals12,250 sharesup +133.4%up +132.2%
11 Sep 202313 Sep 2023SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticalsderivative50,000 sharesup +188.9%up +180.7%
11 Sep 202313 Sep 2023SEC Form 42 dwas grantednot a tradeMadrigal Pharmaceuticals50,000 sharesup +188.9%up +180.7%
3 May 20115 May 2011SEC Form 42 dwas grantednot a tradeAvanir Pharmaceuticalsderivative250,000 shares——
3 May 20115 May 2011SEC Form 42 dwas grantednot a tradeAvanir Pharmaceuticals20,000 shares——

Both percentages are the stock’s move, not William John Sibold’s return: a disclosure gives a band, never an amount, so nobody can say how much was bought or what it made. They run to the last close we hold — 11 Sep 2026, except where a name has since delisted, when the row names its own last session. We publish no close, no volume and no dollar figure behind them. 61 of the 63 rows shown carry a percentage; the rest are dashes with the reason on the row.

Positions come from the unitedstates/congress-legislators roster, the Office of Government Ethics and the SEC’s Form 4 index. Every disclosed line names its own source and links the document the government published; we print what the filing says and never a price we did not read from it. Headlines and links come from the GDELT Global Knowledge Graph — the story stays with the publisher. The portrait, where we have one, is the public-domain Congressional Bioguide photograph.

Some filings reach us as photographs of paper rather than as a form we can read as text. Those are shown here only once they have been read and checked, so this page can hold fewer lines than the filings behind it contain. The link on every row opens the original document, which is always the full record.