Brian Guan-Chyun Liu - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Brian Guan-Chyun Liu has filed 2 SEC Form 4 filings across 1 company in the last 90 days - buying. Lifetime open-market purchases: $74.81M.
Profile
Brian Guan-Chyun Liu is a corporate insider at CG Oncology, Inc. (CGON). Liu has reported 4 insider filings with the SEC since 2024. The most recent filing was in June 2026.
| Role | Insider |
|---|---|
| Notability | 20/100 |
Board memberships
- CG Oncology, Inc.
Trading Pattern
InsiderAlpha's records for Brian Guan-Chyun Liu go back to 2024: 4 primary Form 4 filings, an average of 1.3 per year. The typical open-market purchase is $37.41M (2 buys totaling $74.81M). The largest single buy on record is $50.00M of CGON in 2025. 1 recorded transaction carries a Rule 10b5-1 flag, meaning it was pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Brian Guan-Chyun Liu has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Insider at CG Oncology, Inc. (CGON) - 4 filings, 2024 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-06-29 | CGON | CG Oncology, Inc. | P - Open-market purchase [10b5-1] | 371.1K | $66.87 | $24.81M |
| 2025-09-15 | CGON | CG Oncology, Inc. | P - Open-market purchase | 1.52M | $33.00 | $50.00M |
Companies - Last 90 Days
- CG Oncology, Inc. (CGON) - 2 filings, last 2026-06-29
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies Brian Guan-Chyun Liu has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- James Mulay - $6.28M of CGON open-market activity in the last 12 months
- Hong Fang Song - $2.78M of CGON open-market activity in the last 12 months
- Leonard E. Post - $1.15M of CGON open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- BROADWOOD PARTNERS, L.P.
- Ronald W. Burkle
- BVF PARTNERS L P/IL
- de Retraite D'Hydro-Quebec Caisse
- Kevin T. Callahan
- Michael Cannon-Brookes
- CANTOR FITZGERALD & CO.
- Fitzgerald, L. P. Cantor
Frequently Asked Questions
Who is Brian Guan-Chyun Liu?
Brian Guan-Chyun Liu is a corporate insider at CG Oncology, Inc. (CGON). Liu has reported 4 insider filings with the SEC since 2024. The most recent filing was in June 2026.…
How many SEC Form 4 filings has Brian Guan-Chyun Liu submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Has Brian Guan-Chyun Liu been buying or selling stock?
Recorded transactions: 2 open-market purchases ($74.81M) and 0 open-market sales across all tracked filings.
Where can I see all of Brian Guan-Chyun Liu'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.
Learn More
Open the live Brian Guan-Chyun Liu profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.