Barbara Kosacz
CIK 1763316 · COO & General Counsel · last filed 2026-07-14
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$238.7K
Companies
8
Total Filings
27
Lifetime Open-Market Net
$87.1K
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| XOMA | Director | 0 | $40.17 | $0 | $0 | 4 | 2026-07-14 |
| LONA | Director | — | $6.97 | — | $0 | 2 | 2026-06-24 |
| XOMAP | Director | 9,557 | $24.98 | $238.7K | $0 | 7 | 2026-05-26 |
| LeonaBio, Inc. (ATHA) Delisted | Director | — | $6.92 | — | $0 | 5 | 2025-06-03 |
| CERO THERAPEUTICS HOLDINGS, INC. (PBAXW) Delisted | Director | 5,828 | $0.05 | $292 | $0 | 1 | 2024-02-16 |
| Kronos Bio, Inc. (KRON) Delisted | COO & General Counsel | 928,966 | $0.88 | $817.5K | $87.1K | 6 | 2024-01-05 |
| CERO THERAPEUTICS HOLDINGS, INC. (PBAXU) Delisted | Director | — | $10.37 | — | $0 | 1 | 2021-10-12 |
| LWACU | Director | — | $10.32 | — | $0 | 1 | 2021-01-14 |
Recent Filings · Page 2 of 3
27 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-01-05 | Kronos Bio, Inc. (KRON) Delisted | Sell (S) | −10,676 | -$12.6K | EDGAR |
| 2023-05-22 | LeonaBio, Inc. (ATHA) Delisted | Grant (A) | — | $0 | EDGAR |
| 2023-05-19 | XOMAP | Grant (A) | — | $0 | EDGAR |
| 2023-02-17 | Kronos Bio, Inc. (KRON) Delisted | Grant (A) | +138,911 | $0 | EDGAR |
| 2022-07-27 | Kronos Bio, Inc. (KRON) Delisted | Grant (A) | +53,600 | $0 | EDGAR |
| 2022-05-27 | LeonaBio, Inc. (ATHA) Delisted | Grant (A) | — | $0 | EDGAR |
| 2022-05-20 | XOMAP | Grant (A) | — | $0 | EDGAR |
| 2022-02-17 | Kronos Bio, Inc. (KRON) Delisted | Grant (A) | +53,600 | $0 | EDGAR |
| 2021-10-12 | CERO THERAPEUTICS HOLDINGS, INC. (PBAXU) Delisted | Other (J) | — | $0 | EDGAR |
| 2021-05-21 | XOMAP | Grant (A) | — | $0 | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.