Summary
Updated Aug 31, 2026
Yu Xia is Director of Summit Therapeutics Inc. (SMMT). 1 SEC Form 4 filing on record, dated 23 October 2025. Most recent open-market trade: bought $10.00M of SMMT on 23 October 2025. Lifetime open-market purchases: $10.00M.
Recent Transactions
1Every recent SEC Form 4 transaction Yu Xia has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Yu Xia go back to 2025: 1 primary Form 4 filing, an average of 0.5 per year. The typical open-market purchase is $10.00M (1 buy totaling $10.00M). The largest single buy on record is $10.00M of SMMT in 2025. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Yu Xia 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.
- Robert W. Duggan - $57.93M of SMMT open-market activity in the last 12 months
- Mahkam Zanganeh - $57.93M of SMMT open-market activity in the last 12 months
- Manmeet Singh Soni - $722K of SMMT 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 Yu Xia?
Yu Xia is a corporate insider, tracked as Director of Summit Therapeutics Inc. (SMMT). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Yu Xia last file a Form 4?
The only primary Form 4 on record is dated 23 October 2025.
Has Yu Xia been buying or selling stock?
Recorded transactions: 1 open-market purchase ($10.00M) and 0 open-market sales across all tracked filings.
Where can I see all of Yu Xia'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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