Madrigal Pharmaceuticals Inc
Ownership
Ownership Structure
Who owns Madrigal Pharmaceuticals Inc (MDGL)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 59.4% of the shares are freely tradable; institutional investors hold 106.5%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Baker Bros Advisors LP | 9.27 | 2,141,701 | +0.0 | 03/31/2026 |
| HHG PLC | 8.74 | 2,018,647 | +27.4 | 03/31/2026 |
| RTW INVESTMENTS, LLC | 8.63 | 1,993,687 | +0.0 | 03/31/2026 |
| venBio Select Advisor LLC | 7.87 | 1,818,181 | +0.6 | 03/31/2026 |
| BlackRock Inc | 6.75 | 1,559,965 | -5.2 | 03/31/2026 |
| Paulson & Company Inc | 5.80 | 1,340,020 | -3.7 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.64 | 841,145 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.58 | 827,144 | +0.0 | 03/31/2026 |
| Wellington Management Company LLP | 3.57 | 825,714 | +18.8 | 06/30/2026 |
| State Street Corp | 2.64 | 609,525 | +4.5 | 03/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Sibold William John | President and CEO | 197,746 | 105,675,462 $ | Sep 11, 2026 | direct |
| Kelley Shannon T | General Counsel | 11,474 | 6,131,706 $ | Aug 17, 2026 | direct |
| Reed John C | Director | 647 | 345,757 $ | Aug 15, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 120 | 546.38 | 65,565 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 761 | 544.83 | 414,616 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 1,539 | 544.02 | 837,253 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 1,202 | 542.60 | 652,209 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 368 | 541.64 | 199,324 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 687 | 540.59 | 371,382 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 160 | 537.62 | 86,019 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 218 | 535.94 | 116,836 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 106 | 534.06 | 56,611 |
| Sep 11, 2026 | Sibold William John | President and CEO | Sell | 60 | 533.09 | 31,985 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 160 | 542.55 | 86,808 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 362 | 541.65 | 196,079 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 505 | 540.19 | 272,796 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 215 | 539.03 | 115,891 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 520 | 538.30 | 279,914 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 640 | 537.17 | 343,791 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 1,040 | 536.11 | 557,557 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 644 | 535.27 | 344,715 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 396 | 534.20 | 211,542 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 512 | 533.09 | 272,944 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 368 | 531.99 | 195,772 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 522 | 530.23 | 276,781 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 347 | 529.27 | 183,656 |
| Sep 9, 2026 | Sibold William John | President and CEO | Sell | 131 | 527.88 | 69,152 |
| Aug 17, 2026 | Kelley Shannon T | General Counsel | Sell | 664 | 514.97 | 341,940 |
| Aug 15, 2026 | Reed John C | Director | Other | 647 | 0.00 | – |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 280 | 555.05 | 155,414 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 1 | 550.72 | 551 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 153 | 550.01 | 84,152 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 47 | 548.87 | 25,797 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 680 | 547.70 | 372,435 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 269 | 547.08 | 147,164 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 275 | 545.71 | 150,070 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 545 | 544.71 | 296,869 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 110 | 543.79 | 59,817 |
| Jul 20, 2026 | Sibold William John | President and CEO | Sell | 140 | 542.75 | 75,984 |
| Jul 17, 2026 | Sibold William John | President and CEO | Other | 50,000 | – | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.