Stuart A. Arbuckle

Companies

• Praxis Precision Medicines, Inc.Board member Jan 12, 2026 to now¹
• Alnylam PharmaceuticalsBoard member Jan 7, 2026 to now²
• Vertex PharmaceuticalsChief operating officer Nov 16, 2021 to now³
• Rhythm (United states)Board member Jul 29, 2019 to now⁴
• ImmunoGen Inc.Board member Jan 24, 2018 to Feb 12, 2024⁵
• Vertex PharmaceuticalsEVP\Chief Commercial Officer Sep 6, 2012 to May 19, 2021⁶
• Dare Bioscience, Inc.Board member Jun 30, 2015 to Jan 5, 2017⁷

Holdings

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

Shares held

• Vertex Pharmaceuticals VRTX63,508 shares⁸$31.7M at $499.29Jul 2, 2025
• RURhythm (United states) RYTM11,712 shares⁹$1.0M at $88.66Jun 23, 2026
• PPPraxis Precision Medicines, Inc. PRAX2,537 shares¹⁰$629.8K at $248.24Jun 10, 2026
• Alnylam Pharmaceuticals ALNY671 shares¹¹$155.6K at $231.83May 20, 2026
• IImmunoGen Inc. IMGN0 shares¹²Feb 12, 2024

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

Recent filings

• Jun 23, 2026Exercised options 4,712 shares of Rhythm (United states)⁹
• Jun 10, 2026Granted 1,371 shares of Praxis Precision Medicines, Inc.¹⁰
• May 20, 2026Granted 671 shares of Alnylam Pharmaceuticals¹¹
• Feb 6, 2026Granted 478 shares of Praxis Precision Medicines, Inc.¹³
• Feb 6, 2026Granted 688 shares of Praxis Precision Medicines, Inc.¹³
• Jul 1, 2025Shares withheld for tax 37,243 shares at $450.23 of Vertex Pharmaceuticals⁸
• Jun 18, 2025Exercised options 4,000 shares of Rhythm (United states)¹⁴
• May 13, 2025Granted 37,622 shares of Vertex Pharmaceuticals¹⁵
• Feb 26, 2025Shares withheld for tax 7,071 shares at $479.61 of Vertex Pharmaceuticals¹⁶
• Feb 24, 2025Shares withheld for tax 4,716 shares at $483.28 of Vertex Pharmaceuticals¹⁷
• Feb 14, 2025Shares withheld for tax 2,724 shares at $463.46 of Vertex Pharmaceuticals¹⁸
• Feb 12, 2025Granted 7,903 shares of Vertex Pharmaceuticals¹⁹
• Feb 10, 2025Shares withheld for tax 3,220 shares at $467.98 of Vertex Pharmaceuticals²⁰
• Feb 4, 2025Granted 8,448 shares of Vertex Pharmaceuticals²¹
• Feb 4, 2025Granted 14,624 shares of Vertex Pharmaceuticals²¹
• Jun 21, 2024Exercised options 3,000 shares of Rhythm (United states)²²
• May 15, 2024Sold 69 shares at $430.93 of Vertex Pharmaceuticals²³
• Feb 26, 2024Sold 5,034 shares at $425.70 of Vertex Pharmaceuticals²⁴
• Feb 23, 2024Shares withheld for tax 4,714 shares at $431.79 of Vertex Pharmaceuticals²⁴
• Feb 21, 2024Sold 3,603 shares at $421.77 of Vertex Pharmaceuticals²⁵
• Feb 20, 2024Sold 4,804 shares at $420.79 of Vertex Pharmaceuticals²⁶
• Feb 20, 2024Shares withheld for tax 3,373 shares at $420.58 of Vertex Pharmaceuticals²⁶
• Feb 16, 2024Shares withheld for tax 4,499 shares at $424.01 of Vertex Pharmaceuticals²⁶
• Feb 12, 2024Sold 4,295 shares at $420.24 of Vertex Pharmaceuticals²⁷
• Feb 12, 2024Returned to company 5,381 shares of ImmunoGen Inc.¹²