Form 4: UMBFP Chairman/CEO Kemper Mariner reports insider sale

Rhea-AI Filing Summary

UMB Financial Corp insider sale by Chairman & CEO: The Form 4 shows Kemper J. Mariner, who is Chairman and CEO and a director, sold 15,523 shares of UMB Financial common stock on 08/13/2025 at a weighted-average price of $116.3269 per share. After the reported sales, the filing lists total beneficial ownership of 1,536,781 shares across direct and multiple indirect holdings (trusts, family custodial accounts, ESOP, and affiliated entities). The price represents a weighted average from multiple transactions between $116.20 and $116.75. The form was signed by Megan Mercer as attorney-in-fact for Mr. Mariner.

Positive

• Substantial ongoing ownership: Reporting person retains 1,536,781 shares after the sale, indicating continued significant alignment with shareholders
• Full disclosure: Filing includes weighted-average price range ($116.20–$116.75) and offers to provide further breakdown on request

Negative

• Insider sale disclosed: Chairman and CEO disposed of 15,523 shares, which could be perceived negatively by some investors despite its small size relative to total holdings

Insights

Financial Analyst

TL;DR: CEO sold a small portion of a very large, primarily indirect stake; transaction size is modest relative to total holdings.

The sale of 15,523 shares at a weighted-average $116.3269 is a routine insider disposition rather than a change of control or major divestiture. With reported beneficial ownership of 1,536,781 shares across direct and indirect vehicles, the sold amount represents a small fraction of total holdings (roughly 1%). No derivative transactions or additional compensatory grants are reported. For investors, this is a disclosure of liquidity action by management but not an explicitly material reduction in ownership.

Corporate Governance Expert

TL;DR: Transaction appears procedural and properly disclosed under Section 16; multiple indirect holdings indicate estate and affiliated structures.

The Form 4 lists numerous indirect ownership vehicles (irrevocable trust, custodial accounts, ESOP, affiliated corporations) which is typical for senior executives and reduces single-party concentration risks. The seller used an attorney-in-fact to execute the filing, and the footnote discloses the weighted-average pricing across several trades. There is no indication of trading pursuant to a Rule 10b5-1 plan in this filing, and no amendments or other governance actions are reported.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KEMPER J MARINER

(Last) (First) (Middle)

1010 GRAND BLVD.

(Street)

KANSAS CITY MO 64106

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
UMB FINANCIAL CORP [ UMBF ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman and CEO

3. Date of Earliest Transaction (Month/Day/Year)
08/13/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/13/2025		S		15,523	D	$116.3269(1)	1,536,781	I	By Trust - RC Kemper Irrevocable Trust
Common Stock								336,366.2177	D
Common Stock								1,000	I	By Daughter - Custodial Brokerage Account
Common Stock								2,309.08	I	By Esop
Common Stock								1,000	I	By Son - Custodial Brokerage Account
Common Stock								21,460	I	By Trust - TUW RC Kemper For John Mariner
Common Stock								12,558	I	By Trust: Mary S Hunt Trust
Common Stock								288,945	I	Held by Kemper Realty
Common Stock								392,029	I	Held by Pioneer Service Corporation

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from 116.20 to 116.75, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, additional information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4.

	/s/ Megan Mercer, attorney-in-fact for Mr. Kemper	08/14/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Kemper J. Mariner report on Form 4 for UMBFP?

The Form 4 reports that Kemper J. Mariner sold 15,523 shares of UMB Financial common stock on 08/13/2025 at a weighted-average price of $116.3269 per share.

How many shares does the reporting person beneficially own after the transaction?

The filing lists total beneficial ownership of 1,536,781 shares across direct and multiple indirect holdings after the reported sale.

Was the sale part of a Rule 10b5-1 trading plan?

The Form 4 does not indicate that the transaction was made pursuant to a Rule 10b5-1(c) plan; no such box or plan language is checked or disclosed.

What price range were the sold shares executed at?

The filer discloses a weighted-average price and states the shares were sold at prices ranging from $116.20 to $116.75 per share.

Who signed the Form 4 filing?

The Form 4 was signed by Megan Mercer, attorney-in-fact for Mr. Kemper, dated 08/14/2025.