Summary
Updated Aug 31, 2026
Derek Brummer is President, Mortgage Insurance of RADIAN GROUP INC (RDN). 1 SEC Form 4 filing on record, dated 6 December 2024. Most recent open-market trade: sold $499K of RDN on 6 December 2024. Lifetime open-market sales: $1.01M.
Recent Transactions
2Every recent SEC Form 4 transaction Derek Brummer has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Derek Brummer go back to 2024: 1 primary Form 4 filing, an average of 0.3 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 Derek Brummer 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.
- Michael S. Weinbach - $5.77M of RDN open-market activity in the last 12 months
- Edward J. Hoffman - $2.79M of RDN open-market activity in the last 12 months
- Richard G. Thornberry - $1.39M of RDN open-market activity in the last 12 months
- Eric Ray - $497K of RDN open-market activity in the last 12 months
- Howard Bernard Culang - $311K of RDN open-market activity in the last 12 months
- Noel Joseph Spiegel - $175K of RDN 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 Derek Brummer?
Derek Brummer is a corporate insider, tracked as President, Mortgage Insurance of RADIAN GROUP INC (RDN). InsiderAlpha holds 1 primary Form 4 filing for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Derek Brummer last file a Form 4?
The only primary Form 4 on record is dated 6 December 2024.
Has Derek Brummer been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($1.01M) across all tracked filings.
Where can I see all of Derek Brummer'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 Derek Brummer 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