Insider Trading & Ownership of Barbara Kosacz

Location: Emeryville, CA
Summary: The estimated net worth of Barbara Kosacz is at least $1,304,750 dollars as of 13 Apr 2026. Barbara Kosacz is the COO & General Counsel of Kronos Bio, Inc. and owns shares of Kronos Bio, Inc. stock worth about $1.1M. Barbara Kosacz is the Director of XOMA Royalty Corp and owns shares of XOMA Royalty Corp (XOMA) stock worth about $146.9K. Barbara Kosacz is the Director of PHOENIX BIOTECH ACQUISITION CORP. and owns shares of CERO THERAPEUTICS HOLDINGS, INC. (CERO) stock worth about $58.3K.
Signature: /s/ Mark Worthington, Attorney in fact for Barbara Kosacz
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Key facts

Barbara Kosacz has 4 issuer positions tracked on this page.
Estimated disclosed ownership value: $1,304,750.
Recent insider filing activity is available below.

Change

Largest disclosed position: Kronos Bio, Inc. ($1,099,524).
Past-year value change for that position: .

Research use

This page translates Forms 3/4/5 into a quick ownership context before you inspect each transaction row.
You can cross-check role, issuer, and filing chronology directly against the SEC source.