William P. Donnelly

Companies

• Quanterix (United States)Chair Nov 24, 2025 to now¹
• T. Rowe PriceBoard member Nov 3, 2023 to now²
• Quanterix (United States)Board member Aug 21, 2023 to now³
• Ingersoll RandBoard member May 11, 2017 to now⁴
• Mettler ToledoExecutive Vice President Jan 7, 2014 to Jan 31, 2019⁵
• Mettler ToledoChief financial officer Apr 21, 2006 to Nov 14, 2013⁶

Holdings

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

Shares held

• IRIngersoll Rand IR56,831 shares⁷$4.4M at $78.03Feb 26, 2026
• T. Rowe Price TROW13,348 shares⁸$1.3M at $100.74Sep 29, 2026
• Quanterix (United States) QTRX261,801 shares⁹$730.1K at $2.79Aug 17, 2026

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

Recent filings

• Sep 29, 2026Granted 164 shares at $104.51 of T. Rowe Price⁸
• Aug 17, 2026Exercised options 2,802 shares of Quanterix (United States)⁹
• Aug 13, 2026Bought 72,245 shares at $2.93 of Quanterix (United States)¹⁰
• Aug 12, 2026Bought 27,155 shares at $2.75 of Quanterix (United States)¹⁰
• Jul 1, 2026Granted 5,472 shares at $4.34 of Quanterix (United States)¹¹
• Jun 30, 2026Granted 576 shares of T. Rowe Price¹²
• Jun 29, 2026Granted 142 shares at $114.38 of T. Rowe Price¹²
• May 8, 2026Granted 1,899 shares of T. Rowe Price¹³
• Apr 1, 2026Granted 6,178 shares of Quanterix (United States)¹⁴
• Mar 30, 2026Granted 152 shares at $89.03 of T. Rowe Price¹⁵
• Feb 26, 2026Exercised options 3,029 shares of Ingersoll Rand⁷
• Jan 2, 2026Granted 2,377 shares of Quanterix (United States)¹⁶
• Dec 31, 2025Granted 621 shares of T. Rowe Price¹⁷
• Dec 30, 2025Granted 119 shares at $103.64 of T. Rowe Price¹⁷
• Oct 1, 2025Granted 5,076 shares at $5.54 of Quanterix (United States)¹⁸
• Sep 29, 2025Granted 117 shares at $103.52 of T. Rowe Price¹⁹
• Jul 1, 2025Granted 4,204 shares at $6.69 of Quanterix (United States)²⁰
• Jun 30, 2025Granted 670 shares of T. Rowe Price²¹
• Jun 27, 2025Granted 116 shares at $96.10 of T. Rowe Price²¹
• Jun 6, 2025Bought 93,113 shares at $5.44 of Quanterix (United States)²²
• May 9, 2025Granted 2,157 shares of T. Rowe Price²³
• Apr 1, 2025Granted 2,681 shares at $6.67 of Quanterix (United States)²⁴
• Mar 28, 2025Granted 90 shares at $91.57 of T. Rowe Price²⁵
• Feb 27, 2025Exercised options 2,793 shares of Ingersoll Rand²⁶
• Jan 2, 2025Granted 1,282 shares at $10.76 of Quanterix (United States)²⁷