ARTHUR TZIANABOS
CIK 1586226 · Interim Executive Chair · last filed 2026-07-21
ARTHUR TZIANABOS is an Interim Executive Chair who has filed 50 SEC Form 4 insider transactions across 6 companies since 2013. The most recent filing, for QTTB, was dated Jul 21, 2026. Across all open-market trades the lifetime net is −$3.7M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.3M 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.
$1.28M
6
50
-$3.74M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| QTTB | Director | 7,983 | $15.67 | $125.1K | -$6.4K | 6 | 2026-07-21 |
| STOK | Interim Executive Chair | 35,694 | $32.23 | $1.15M | -$1.70M | 12 | 2026-06-05 |
| Q32 Bio Inc. (FIXX) Delisted | President & CEO | 875 | $16.82 | $14.7K | -$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 | 1,760 | — | — | $21.7K | 7 | 2015-12-07 |
Recent Filings
50 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-07-21 | QTTB | Grant (A) | — | $0 | EDGAR |
| 2026-06-16 | QTTB | Grant (A) | — | $0 | EDGAR |
| 2026-06-05 | STOK | Grant (A) | — | $0 | EDGAR |
| 2026-03-12 | STOK | Mixed | −400 | -$141.3K | EDGAR |
| 2026-03-10 | STOK | Notice (144) | −90,508 | -$3.47M | EDGAR |
| 2025-10-27 | QTTB | Grant (A) | — | $0 | EDGAR |
| 2025-03-20 | STOK | Grant (A) | — | $0 | EDGAR |
| 2025-02-27 | QTTB | Mixed | — | $0 | EDGAR |
| 2024-08-14 | QTTB | Mixed | +830 | -$6.4K | EDGAR |
| 2024-06-07 | STOK | Grant (A) | — | $0 | EDGAR |
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.