[Form 4] MARSH & MCLENNAN COMPANIES, INC. Insider Trading Activity

Rhea-AI Filing Summary

Marsh & McLennan director Jan Siegmund reported an internal equity adjustment involving 5.29 restricted stock units credited as dividend equivalents under the Directors Stock Compensation Plan. These units convert to common stock on a 1‑for‑1 basis, increasing his restricted stock unit holdings to 948.42.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Siegmund Jan

Role null

Type	Security	Shares	Price	Value
Other	Restricted Stk. Units-Dir. Stk. Plan	5.29	$160.60	$849.57

Holdings After Transaction: Restricted Stk. Units-Dir. Stk. Plan — 948.42 shares (Direct, null)

Footnotes (1)

1. The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis. Acquired with dividend equivalents credited to the reporting person's account under the Marsh & McLennan Companies Directors Stock Compensation Plan. Not applicable.

Key Figures

Restricted stock units credited: 5.29 units Reference price per unit: $160.60 per unit RSU holdings after transaction: 948.42 units +1 more

4 metrics

Restricted stock units credited 5.29 units Dividend equivalents under Directors Stock Compensation Plan on 2026-05-15

Reference price per unit $160.60 per unit Transaction price per share field for RSU credit

RSU holdings after transaction 948.42 units Total restricted stock units following the reported transaction

Conversion ratio 1 RSU : 1 common share Security converts to Marsh & McLennan common stock on a 1‑for‑1 basis

Key Terms

Restricted stock units, Dividend equivalents, Directors Stock Compensation Plan, Other acquisition or disposition

4 terms

Restricted stock units financial

"The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Dividend equivalents financial

"Acquired with dividend equivalents credited to the reporting person's account"

Payments tied to employee or contractor equity awards that mirror the cash dividends paid on the company’s stock; they give the holder the same economic benefit as owning the shares without transferring actual shares—often paid in cash or additional award units when the award becomes payable. Investors care because these payments affect a company’s compensation costs, cash flow and potential share dilution, and they signal how management is being rewarded and aligned with shareholders.

Directors Stock Compensation Plan financial

"under the Marsh & McLennan Companies Directors Stock Compensation Plan."

Other acquisition or disposition regulatory

"transaction code J with description "Other acquisition or disposition""

Form 4 Insider Transactions: What Each Field Means →

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^*

Siegmund Jan

(Last) (First) (Middle)

1166 AVENUE OF THE AMERICAS

(Street)

NEW YORK NEW YORK 10036

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MARSH & MCLENNAN COMPANIES, INC. [ MRSH ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/15/2026

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

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

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

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

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
Restricted Stk. Units-Dir. Stk. Plan	(1)	05/15/2026		J(2)	V	5.29		(3)	(3)	Common Stock	5.29	$160.6	948.42	D

Explanation of Responses:

1. The security converts to Marsh & McLennan Companies common stock on a 1-for-1 basis.

2. Acquired with dividend equivalents credited to the reporting person's account under the Marsh & McLennan Companies Directors Stock Compensation Plan.

3. Not applicable.

	/s/ Tessa Patti, Attorney-in-fact	05/18/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Marsh & McLennan (MMC) director Jan Siegmund report?

Director Jan Siegmund reported an internal equity adjustment involving 5.29 restricted stock units. These units were credited as dividend equivalents under Marsh & McLennan’s Directors Stock Compensation Plan, rather than through any open-market purchase or sale of common stock.

How many restricted stock units did MMC director Jan Siegmund receive in this filing?

Jan Siegmund received 5.29 restricted stock units in this transaction. The units were credited as dividend equivalents to his account under the Marsh & McLennan Directors Stock Compensation Plan, reflecting additional compensation rather than a traditional stock market trade.

Do Jan Siegmund’s reported restricted stock units convert into Marsh & McLennan (MMC) common stock?

Yes. The filing states the security converts to Marsh & McLennan Companies common stock on a 1‑for‑1 basis. Each restricted stock unit therefore represents one potential share of common stock when the units ultimately settle or vest according to plan terms.

What are Jan Siegmund’s total restricted stock unit holdings after this MMC transaction?

After this transaction, Jan Siegmund holds 948.42 restricted stock units. This figure reflects his updated balance under the Marsh & McLennan Companies Directors Stock Compensation Plan, including the 5.29 units credited as dividend equivalents in the reported event.

Was this MMC insider event an open-market buy or sell of shares by Jan Siegmund?

No. The transaction used code J, described as another type of acquisition or disposition, and involved dividend equivalent credits. It did not represent an open-market buy or sell, but rather an internal adjustment within the director stock compensation program.