ARTHUR TZIANABOS
CIK 1586226 · Interim Executive Chair · last filed 2026-06-05
"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.
Loading insider history…
Disclosed Exposure
$1.17M
Companies
6
Total Filings
47
Lifetime Open-Market Net
-$3.74M
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 |
|---|---|---|---|---|---|---|---|
| STOK | Interim Executive Chair | 35,694 | $29.82 | $1.06M | -$1.70M | 12 | 2026-06-05 |
| QTTB | Director | 7,983 | $12.64 | $100.9K | -$6.4K | 4 | 2025-10-27 |
| Q32 Bio Inc. (FIXX) Delisted | President & CEO | 141,815 | $16.82 | $2.39M | -$2.06M | 18 | 2024-02-15 |
| Akouos, Inc. (AKUS) Delisted | Director | 0 | $13.29 | $0 | $0 | 3 | 2022-12-02 |
| DNIB UNWIND, INC. (BIND) Delisted | Director | — | — | — | $0 | 2 | 2016-06-22 |
| Tempest Therapeutics, Inc. (OVAS) Delisted | President and CSO | 26,400 | — | — | $21.7K | 7 | 2015-12-07 |
Recent Filings · Page 3 of 5
47 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2021-06-25 | STOK | Grant (A) | — | $0 | EDGAR |
| 2021-02-23 | STOK | Mixed | — | -$584.8K | EDGAR |
| 2021-02-09 | Q32 Bio Inc. (FIXX) Delisted | Grant (A) | — | $0 | EDGAR |
| 2020-11-25 | STOK | Mixed | — | -$876.8K | EDGAR |
| 2020-06-05 | STOK | Grant (A) | — | $0 | EDGAR |
| 2020-02-05 | Q32 Bio Inc. (FIXX) Delisted | Sell (S) | −12,500 | -$202.0K | EDGAR |
| 2020-01-03 | Q32 Bio Inc. (FIXX) Delisted | Sell (S) | −12,500 | -$256.2K | EDGAR |
| 2019-12-13 | Q32 Bio Inc. (FIXX) Delisted | Grant (A) | — | $0 | EDGAR |
| 2019-12-03 | Q32 Bio Inc. (FIXX) Delisted | Sell (S) | −25,000 | -$403.7K | EDGAR |
| 2019-10-02 | Q32 Bio Inc. (FIXX) Delisted | Sell (S) | −12,500 | -$217.5K | 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.