Quick Takeaways
- Barbara Kosacz has 4 issuer positions tracked on this page.
- Estimated disclosed ownership value: $1,304,750.
- Recent insider filing activity is available below.
- Info
- Insider Ownership
Insider Trading & Ownership of Barbara Kosacz
- Location
- Palo Alto, CA
- Summary
- The estimated net worth of Barbara Kosacz is at least $1,304,750 dollars as of 03 Jun 2025. 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
- All Insider Reports
- All Insider Reports
Follow Filing Activity
Follow Barbara Kosacz and return when a new Insider Trading filing appears.
This tracks SEC filing changes for this page using existing product update flows.
What Changed
- Largest disclosed position: Kronos Bio, Inc. ($1,099,524).
- Past-year value change for that position: .
Why This Matters
- 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.
Official SEC Source
Filed on Form 4
Insider ownership context is sourced from SEC Forms 3, 4, and 5.
See Original FilingOwnership of Barbara Kosacz
| Symbol | Company | Relationship | Holdings Value | Past Year Net Change | Change % | Report Period |
|---|---|---|---|---|---|---|
| KRON | Kronos Bio, Inc. | COO & General Counsel | $1,099,524 | 04 Jan 2024 | ||
| XOMA, XOMAO | XOMA Royalty Corp | Director | $146,946 | 21 May 2025 | ||
| CERO, CEROW | PHOENIX BIOTECH ACQUISITION CORP. | Director | $58,280 | 14 Feb 2024 | ||
| LONA | Athira Pharma, Inc. | Director | 30 May 2025 |
Insider Transactions Reported by Barbara Kosacz:
| Sym | Company | Class | Transaction | % | Value $ | * Price $ | Shares | Shares After | Date | Ownership |
|---|
* An asterisk sign (*) next to the price indicates that the price is likely invalid.