ARTHUR TZIANABOS
CIK 1586226 · Interim Executive Chair · last filed 2026-07-21
"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
$1.28M
Companies
6
Total Filings
50
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 |
|---|---|---|---|---|---|---|---|
| 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 · Page 2 of 5
50 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 |
|---|---|---|---|---|---|
| 2024-03-27 | QTTB | Grant (A) | — | $0 | EDGAR |
| 2024-02-15 | STOK | Exer (M) | +31,739 | $69.5K | EDGAR |
| 2024-02-15 | Q32 Bio Inc. (FIXX) Delisted | Mixed | +20,383 | -$7.4K | EDGAR |
| 2023-06-15 | STOK | Grant (A) | — | $0 | EDGAR |
| 2023-06-15 | Q32 Bio Inc. (FIXX) Delisted | Grant (A) | — | $0 | EDGAR |
| 2023-01-11 | Q32 Bio Inc. (FIXX) Delisted | Sell (S) | −10,616 | -$14.8K | EDGAR |
| 2023-01-04 | Q32 Bio Inc. (FIXX) Delisted | Exer (M) | +33,000 | $0 | EDGAR |
| 2022-12-02 | Akouos, Inc. (AKUS) Delisted | Mixed | −26,930 | $0 | EDGAR |
| 2022-06-27 | Akouos, Inc. (AKUS) Delisted | Grant (A) | — | $0 | EDGAR |
| 2022-06-08 | STOK | 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.