Barbara Kosacz

Companies

• LeonaBio, Inc.Board member Mar 8, 2021 to now¹
• Kronos Bio, Inc.Chief operating officer Oct 8, 2020 to now²
• Kronos Bio, Inc.General counsel Oct 8, 2020 to now²
• XOMA Royalty CorpBoard member Jan 3, 2019 to now³
• CERO THERAPEUTICS HOLDINGS, INC.Board member Oct 5, 2021 to Feb 16, 2024⁴
• eFFECTOR Therapeutics, Inc.Board member Jan 7, 2021 to Jan 14, 2021⁵

Holdings

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

Shares held

• CTCERO THERAPEUTICS HOLDINGS, INC. CERO5,828 shares⁶$35 at $0.01Feb 14, 2024
• XRXOMA Royalty Corp0 shares⁷Jul 14, 2026
• KBKronos Bio, Inc.928,966 shares⁸Jan 4, 2024

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

Recent filings

• Jul 14, 2026Other 6,269 shares of XOMA Royalty Corp⁷
• May 21, 2026Granted 3,586 shares of XOMA Royalty Corp⁹
• May 21, 2025Granted 5,971 shares of XOMA Royalty Corp¹⁰
• May 21, 2025Granted 5,971 shares of XOMA Royalty Corp¹¹
• Feb 14, 2024Other 5,828 shares of CERO THERAPEUTICS HOLDINGS, INC.⁶
• Jan 4, 2024Sold 10,676 shares at $1.18 of Kronos Bio, Inc.⁸
• Feb 15, 2023Granted 138,911 shares of Kronos Bio, Inc.¹²
• Jul 25, 2022Granted 53,600 shares of Kronos Bio, Inc.¹³
• Feb 15, 2022Granted 53,600 shares of Kronos Bio, Inc.¹⁴