Summary
Updated Aug 31, 2026
Jonathan Brassington is Director of SEI INVESTMENTS CO (SEIC). 2 SEC Form 4 filings on record going back to 2024, most recently on 16 December 2025.
Recent Transactions
2Every recent SEC Form 4 transaction Jonathan Brassington has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Jonathan Brassington go back to 2024: 2 primary Form 4 filings, an average of 0.7 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.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Jonathan Brassington 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.
- Alfred P. West Jr. - $12.01M of SEIC open-market activity in the last 12 months
- Ryan Hicke - $6.99M of SEIC open-market activity in the last 12 months
- Michael Peterson - $5.56M of SEIC open-market activity in the last 12 months
- Philip McCabe - $4.53M of SEIC open-market activity in the last 12 months
- Sanjay Sharma - $4.24M of SEIC open-market activity in the last 12 months
- Kathryn McCarthy - $2.80M of SEIC 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 Jonathan Brassington?
Jonathan Brassington is a corporate insider, tracked as Director of SEI INVESTMENTS CO (SEIC). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Jonathan Brassington last file a Form 4?
The most recent primary Form 4 on record is dated 16 December 2025, one of 2 filings going back to 2024.
Where can I see all of Jonathan Brassington'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
Follow Jonathan Brassington and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial