Summary
Updated Aug 31, 2026
Arthur Tzianabos files SEC Form 4 reports at Q32 Bio Inc. (QTTB). 5 SEC Form 4 filings on record going back to 2025, most recently on 22 July 2026. Most recent open-market trade: sold $174K of STOK on 12 March 2026. Lifetime open-market sales: $174K.
Recent Transactions
2Every recent SEC Form 4 transaction Arthur Tzianabos has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Arthur Tzianabos go back to 2025: 5 primary Form 4 filings, an average of 2.5 per year. 3 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Arthur Tzianabos files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- ORBIMED ADVISORS LLC - $15.00M of QTTB open-market activity in the last 12 months
- Diyong Xu - $15.00M of QTTB open-market activity in the last 12 months
- Edward M. Md Kaye - $3.99M of STOK open-market activity in the last 12 months
- Adrian R. Krainer - $3.90M of STOK open-market activity in the last 12 months
- Barry Ticho - $1.92M of STOK open-market activity in the last 12 months
- Jonathan Allan - $1.87M of STOK open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Arthur Tzianabos?
Arthur Tzianabos is a corporate insider of Q32 Bio Inc. (QTTB). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Arthur Tzianabos submitted recently?
3 primary Form 4 filings in the last 90 days, covering 2 companies.
Has Arthur Tzianabos been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($174K) across all tracked filings.
Where can I see all of Arthur Tzianabos's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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