Charles N. York Ii.

Companies

• Day One Biopharmaceuticals, Inc.Chief financial officer May 26, 2021 to now¹
• Day One Biopharmaceuticals, Inc.Chief operating officer May 26, 2021 to now¹
• Aeglea BioTherapeuticsChief financial officer Apr 6, 2016 to Feb 19, 2020²

Holdings

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

Shares held

• DODay One Biopharmaceuticals, Inc.0 shares³Apr 23, 2026

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

Recent filings

• Apr 23, 2026Returned to company 312,025 shares of Day One Biopharmaceuticals, Inc.³
• Feb 17, 2026Sold 6,065 shares at $11.60 of Day One Biopharmaceuticals, Inc.⁴
• Feb 15, 2026Exercised options 7,875 shares of Day One Biopharmaceuticals, Inc.⁴
• Feb 15, 2026Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁴
• Feb 15, 2026Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁴
• Feb 15, 2026Exercised options 2,250 shares of Day One Biopharmaceuticals, Inc.⁴
• Nov 17, 2025Sold 4,062 shares at $8.91 of Day One Biopharmaceuticals, Inc.⁵
• Nov 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁵
• Nov 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁵
• Nov 15, 2025Exercised options 2,250 shares of Day One Biopharmaceuticals, Inc.⁵
• Nov 15, 2025Exercised options 1,375 shares of Day One Biopharmaceuticals, Inc.⁵
• Aug 18, 2025Sold 4,106 shares at $6.77 of Day One Biopharmaceuticals, Inc.⁶
• Aug 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁶
• Aug 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁶
• Aug 15, 2025Exercised options 2,250 shares of Day One Biopharmaceuticals, Inc.⁶
• Aug 15, 2025Exercised options 1,375 shares of Day One Biopharmaceuticals, Inc.⁶
• May 16, 2025Sold 4,282 shares at $6.26 of Day One Biopharmaceuticals, Inc.⁷
• May 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁷
• May 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁷
• May 15, 2025Exercised options 2,250 shares of Day One Biopharmaceuticals, Inc.⁷
• May 15, 2025Exercised options 1,375 shares of Day One Biopharmaceuticals, Inc.⁷
• Feb 18, 2025Sold 4,370 shares at $11.96 of Day One Biopharmaceuticals, Inc.⁸
• Feb 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁸
• Feb 15, 2025Exercised options 6,625 shares of Day One Biopharmaceuticals, Inc.⁸
• Feb 15, 2025Exercised options 2,250 shares of Day One Biopharmaceuticals, Inc.⁸