Joseph S Zakrzewski
CIK 1331852 · Chief Executive Officer · last filed 2026-03-23
Joseph S Zakrzewski is a Chief Executive Officer who has filed 107 SEC Form 4 insider transactions across 6 companies since 2008. The most recent filing, for ANTX, was dated Mar 23, 2026. Across all open-market trades the lifetime net is −$51.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $10.2M across reported positions.
"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.
$10.18M
6
107
-$51.93M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ANTX | Director | 551,418 | $4.74 | $2.61M | -$1.88M | 12 | 2026-03-23 |
| Cyteir Therapeutics, Inc. (CYT) Delisted | Director | 376,490 | $3.02 | $1.14M | $176.6K | 11 | 2024-02-08 |
| SANGAMO THERAPEUTICS, INC (SGMO) Delisted | Director | 60,700 | $0.18 | $10.8K | $147.9K | 9 | 2022-03-01 |
| AMRN | Director | 196,547 | $15.24 | $3.00M | -$45.96M | 38 | 2021-12-16 |
| ACCELERON PHARMA INC (XLRN) Delisted | Director | 0 | $178.75 | $0 | -$2.46M | 15 | 2021-11-22 |
| PODD | Director | 30,558 | $149.70 | $4.57M | -$1.95M | 12 | 2017-05-18 |
Recent Filings
107 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-23 | ANTX | Mixed | — | $0 | EDGAR |
| 2026-02-23 | ANTX | Grant (A) | — | $0 | EDGAR |
| 2025-05-23 | ANTX | Grant (A) | — | $0 | EDGAR |
| 2025-04-11 | ANTX | Grant (A) | +10,523 | $0 | EDGAR |
| 2024-12-23 | ANTX | Grant (A) | +9,816 | $0 | EDGAR |
| 2024-11-27 | ANTX | Buy (P) | +2,000 | $2.8K | EDGAR |
| 2024-11-20 | ANTX | Buy (P) | +25,000 | $25.0K | EDGAR |
| 2024-06-21 | ANTX | Grant (A) | — | $0 | EDGAR |
| 2024-02-08 | Cyteir Therapeutics, Inc. (CYT) Delisted | Exer (M) | +14,150 | $23.9K | EDGAR |
| 2024-01-19 | ANTX | Sell (S) | −100,000 | -$1.91M | EDGAR |