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.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
UMB Financial Corporation April 28, 202698.0%
-
UMB Financial Corporation April 29, 202595.8%
-
UMB Financial Corporation April 30, 202497.8%
-
UMB Financial Corporation April 25, 202396.2%
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 |
|---|---|---|---|---|---|
| Nov 2, 2026 | UMB Financial Corporation | Gift | −15,062 | — | — |
| Nov 2, 2026 | UMB Financial Corporation | Gift | +15,062 | — | — |
| Oct 31, 2026 | UMB Financial Corporation | Shares withheld for tax | −815 | $134.47 | $109,593 |
| 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 |
Questions about J. Mariner Kemper
What boards is J. Mariner Kemper on?
J. Mariner Kemper sits on the board of UMB Financial Corporation.
What company is J. Mariner Kemper the CEO of?
J. Mariner Kemper is Chairman and CEO of UMB Financial Corporation.
How long has J. Mariner Kemper served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
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