Joseph S Zakrzewski
CIK 1331852 · Chief Executive Officer · last filed 2026-03-23
"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
$10.18M
Companies
6
Total Filings
107
Lifetime Open-Market Net
-$51.93M
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 |
|---|---|---|---|---|---|---|---|
| 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 · Page 3 of 11
107 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-12-28 | Cyteir Therapeutics, Inc. (CYT) Delisted | Buy (P) | +1,100 | $10.9K | EDGAR |
| 2021-12-21 | Cyteir Therapeutics, Inc. (CYT) Delisted | Buy (P) | +200 | $2.0K | EDGAR |
| 2021-12-16 | AMRN | Buy (P) | +12,000 | $39.0K | EDGAR |
| 2021-12-15 | Cyteir Therapeutics, Inc. (CYT) Delisted | Buy (P) | +3,700 | $39.8K | EDGAR |
| 2021-11-22 | ACCELERON PHARMA INC (XLRN) Delisted | Mixed | −34,499 | $0 | EDGAR |
| 2021-06-24 | Cyteir Therapeutics, Inc. (CYT) Delisted | Conv (C) | +58,671 | $0 | EDGAR |
| 2021-06-16 | AMRN | Grant (A) | — | $0 | EDGAR |
| 2021-04-05 | ACCELERON PHARMA INC (XLRN) Delisted | Mixed | — | -$1.17M | EDGAR |
| 2021-04-02 | ACCELERON PHARMA INC (XLRN) Delisted | Mixed | — | -$1.11M | EDGAR |
| 2021-03-01 | SANGAMO THERAPEUTICS, INC (SGMO) Delisted | Grant (A) | +8,200 | $0 | EDGAR |
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.