Summary
Updated Aug 31, 2026
J. Mariner Kemper is Chairman and CEO, Director of UMB FINANCIAL CORP (UMBF). 17 SEC Form 4 filings on record going back to 2024, most recently on 6 August 2026. Most recent open-market trade: sold $2.24M of UMBF on 6 August 2026. Lifetime open-market sales: $16.34M.
Recent Transactions
20Every recent SEC Form 4 transaction J. Mariner Kemper has reported, most recent first.
Trading Pattern
InsiderAlpha's records for J. Mariner Kemper go back to 2024: 17 primary Form 4 filings, an average of 5.7 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 J. Mariner Kemper 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.
- James D. Rine - $1.09M of UMBF open-market activity in the last 12 months
- Thomas S. Terry - $867K of UMBF open-market activity in the last 12 months
- Uma Wilson - $771K of UMBF open-market activity in the last 12 months
- Nikki Farentino Newton - $435K of UMBF open-market activity in the last 12 months
- Ram Shankar - $303K of UMBF open-market activity in the last 12 months
- Robert Brian Beaird - $231K of UMBF 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 J. Mariner Kemper?
J. Mariner Kemper is a corporate insider, tracked as Chairman and CEO, Director of UMB FINANCIAL CORP (UMBF). InsiderAlpha holds 17 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has J. Mariner Kemper submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Has J. Mariner Kemper been buying or selling stock?
Recorded transactions: 0 open-market purchases and 23 open-market sales ($16.34M) across all tracked filings.
Where can I see all of J. Mariner Kemper'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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