Summary
Updated Aug 30, 2026
David Spencer Soffer files SEC Form 4 reports at XBiotech Inc. (XBIT). 1 SEC Form 4 filing on record, dated 12 November 2025.
Trading Pattern
InsiderAlpha's records for David Spencer Soffer go back to 2025: 1 primary Form 4 filing, an average of 0.5 per year. 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.
Most Active Insiders Right Now
David Spencer Soffer has no co-filers on record, so these are insiders with the largest open-market activity across the market in the last 90 days.
- J. Scott Sitra - $100.00M of SCTH open-market activity in the last 90 days
- Patrick Sean Neville - $99.65M of CRCL open-market activity in the last 90 days
- Jason P. Rhodes - $99.40M of DYN open-market activity in the last 90 days
- Catalyst4, Inc. - $98.71M of MPLT open-market activity in the last 90 days
- Sanjay Mehrotra - $96.58M of MU open-market activity in the last 90 days
- David N. Capobianco - $93.81M of LB open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is David Spencer Soffer?
David Spencer Soffer is a corporate insider of XBiotech Inc. (XBIT). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did David Spencer Soffer last file a Form 4?
The only primary Form 4 on record is dated 12 November 2025.
Where can I see all of David Spencer Soffer'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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