J. Mariner Kemper
Chairman and CEO at UMB Financial Corporation
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: UMB Financial Corporation, 3 years.
UMB Financial Corporation
Director · Chairman and CEO
Chief executive roles
UMB Financial Corporation
· Chairman and CEO
Dates unknown
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 4, 2026 | UMB Financial Corporation | Open-market sale | −15,062 | $148.55 | $2,237,460 |
| Aug 3, 2026 | UMB Financial Corporation | Gift | +9,761 | — | — |
| Aug 3, 2026 | UMB Financial Corporation | Open-market sale | −4,200 | $147.27 | $618,534 |
| Feb 11, 2026 | UMB Financial Corporation | Shares withheld for tax | −1,090 | $132.16 | $144,054 |
| Feb 10, 2026 | UMB Financial Corporation | Shares withheld for tax | −1,721 | $132.87 | $228,669 |
| Feb 9, 2026 | UMB Financial Corporation | Shares withheld for tax | −1,904 | $134.29 | $255,688 |
| Feb 9, 2026 | UMB Financial Corporation | Grant or award | +16,510 | — | — |
| Feb 7, 2026 | UMB Financial Corporation | Shares withheld for tax | −2,043 | $134.32 | $274,416 |
| Feb 2, 2026 | UMB Financial Corporation | Open-market sale | −3,500 | $129.06 | $451,710 |
| Feb 2, 2026 | UMB Financial Corporation | Open-market sale | −7,972 | $128.04 | $1,020,735 |
| Feb 2, 2026 | UMB Financial Corporation | Open-market sale | −7,242 | $129.19 | $935,594 |
| Dec 31, 2025 | UMB Financial Corporation | Shares withheld for tax | −7,629 | $115.04 | $877,640 |
| Dec 8, 2025 | UMB Financial Corporation | Open-market sale | −15,367 | $114.58 | $1,760,751 |
| Oct 31, 2025 | UMB Financial Corporation | Grant or award | +5,613 | — | — |
| Sep 10, 2025 | UMB Financial Corporation | Open-market sale | −800 | $122.66 | $98,128 |
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