Michael G. Grey

Companies

• OnKure Therapeutics, Inc.Board member Oct 8, 2024 to now¹
• SPRUCE BIOSCIENCES, INC.Chair Oct 8, 2020 to now²
• Mirum PharmaceuticalsBoard member Jan 2, 2020 to now³
• Horizon Therapeutics Public Ltd CoBoard member Oct 3, 2011 to Oct 6, 2023⁴
• OnKure Therapeutics, Inc.Chair Apr 8, 2021 to Jul 27, 2023⁵
• BioMarin PharmaceuticalBoard member Dec 18, 2006 to Mar 9, 2021⁶
• Mirati Therapeutics, Inc.Board member Nov 6, 2014 to Jan 20, 2021⁷
• Mirum PharmaceuticalsChair Jul 17, 2019 to Jul 24, 2019⁸

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• MPMirum Pharmaceuticals MIRM93,750 shares⁹$7.7M at $82.39Dec 23, 2025
• OTOnKure Therapeutics, Inc. OKUR134,084 shares¹⁰$285.6K at $2.13Jul 27, 2023
• HTHorizon Therapeutics Public Ltd Co0 shares¹¹Oct 6, 2023

As of each latest filing. The line shows shares held over time.

Recent filings

• Dec 19, 2025Sold 50,000 shares at $78.00 of Mirum Pharmaceuticals⁹
• Dec 19, 2025Exercised options 50,000 shares at $2.94 of Mirum Pharmaceuticals⁹
• Dec 1, 2025Sold 50,000 shares at $74.00 of Mirum Pharmaceuticals¹²
• Dec 1, 2025Exercised options 50,000 shares at $2.94 of Mirum Pharmaceuticals¹²
• Nov 21, 2025Sold 50,000 shares at $70.00 of Mirum Pharmaceuticals¹³
• Nov 21, 2025Exercised options 50,000 shares at $2.94 of Mirum Pharmaceuticals¹³
• Sep 27, 2024Gift 102,788 shares of Mirum Pharmaceuticals¹⁴
• Oct 6, 2023Returned to company 10,000 shares at $116.50 of Horizon Therapeutics Public Ltd Co¹¹
• Oct 6, 2023Returned to company 48,031 shares at $116.50 of Horizon Therapeutics Public Ltd Co¹¹
• Oct 6, 2023Returned to company 39,361 shares at $116.50 of Horizon Therapeutics Public Ltd Co¹¹
• Sep 28, 2023Exercised options 20,000 shares at $15.96 of Horizon Therapeutics Public Ltd Co¹⁵
• Sep 14, 2023Sold 14,216 shares at $32.00 of Mirum Pharmaceuticals¹⁶
• Sep 14, 2023Exercised options 14,216 shares at $2.94 of Mirum Pharmaceuticals¹⁶
• Sep 13, 2023Sold 392 shares at $32.00 of Mirum Pharmaceuticals¹⁶
• Sep 13, 2023Exercised options 392 shares at $2.94 of Mirum Pharmaceuticals¹⁶
• Jul 26, 2023Gift 50,000 shares of OnKure Therapeutics, Inc.¹⁰
• Jun 8, 2023Sold 14,608 shares at $29.00 of Mirum Pharmaceuticals¹⁷
• Jun 8, 2023Exercised options 14,608 shares at $2.94 of Mirum Pharmaceuticals¹⁷
• May 3, 2023Sold 14,608 shares at $28.00 of Mirum Pharmaceuticals¹⁸
• May 3, 2023Exercised options 14,608 shares at $2.94 of Mirum Pharmaceuticals¹⁸
• Apr 28, 2023Exercised options 3,913 shares of Horizon Therapeutics Public Ltd Co¹⁹
• Aug 31, 2022Exercised options 50,000 shares at $1.97 of OnKure Therapeutics, Inc.²⁰
• Apr 29, 2022Shares withheld for tax 1,139 shares at $98.56 of Horizon Therapeutics Public Ltd Co²¹
• Apr 29, 2022Exercised options 4,223 shares of Horizon Therapeutics Public Ltd Co²¹