GCM Grosvenor accounting officer sells 40K shares

GCM Grosvenor Inc. (GCMG) reports that Principal Accounting Officer Kathleen Patricia Sullivan sold a total of 40,000 shares of Class A common stock in two open-market or private transactions.

Rhea-AI Filing Summary

GCM Grosvenor Inc. (GCMG) reports that Principal Accounting Officer Kathleen Patricia Sullivan sold a total of 40,000 shares of Class A common stock in two open-market or private transactions. On September 2, 2026 she sold 24,963 shares at a weighted average price of $13.1538 per share, in trades ranging from $13.0500 to $13.4500. On September 3, 2026 she sold 15,037 shares at a weighted average price of $13.1648 per share, in trades ranging from $13.0200 to $13.3500. No Rule 10b5-1 trading plan is reported for these sales.

Insider Trade Summary

Net Seller: 40,000 shares

Net Sell 2 txns

Insider SULLIVAN KATHLEEN PATRICIA

Role Principal Accounting Officer

Sold 40,000 shs ($526K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F2	15,037	$13.1648	$198K
Sale	Class A Common Stock F1	24,963	$13.1538	$328K

Holdings After Transaction: Class A Common Stock — 44,795 shares (Direct)

Footnotes (2)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.0500 to $13.4500, inclusive.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.0200 to $13.3500, inclusive.

Key Figures

Shares sold September 2, 2026: 24,963 shares Weighted average price September 2, 2026: $13.1538 per share Shares sold September 3, 2026: 15,037 shares +2 more

5 metrics

Shares sold September 2, 2026 24,963 shares Class A common stock sold in open-market or private transactions

Weighted average price September 2, 2026 $13.1538 per share Sales ranged from $13.0500 to $13.4500 per share

Shares sold September 3, 2026 15,037 shares Class A common stock sold in open-market or private transactions

Weighted average price September 3, 2026 $13.1648 per share Sales ranged from $13.0200 to $13.3500 per share

Total shares sold 40,000 shares Combined Class A common stock sales on September 2 and 3, 2026

Key Terms

weighted average price, open market or private transaction, Rule 10b5-1

3 terms

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open market or private transaction financial

"Sale in open market or private transaction for Class A common stock."

Rule 10b5-1 regulatory

"No Rule 10b5-1 trading plan is reported for these sales."

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

What insider transaction in GCMG stock did Kathleen Patricia Sullivan report?

She reported selling 40,000 shares of GCM Grosvenor Inc. Class A common stock in open-market or private transactions on September 2 and 3, 2026, according to the Form 4.

How many GCMG shares were sold on each date?

On September 2, 2026, she sold 24,963 shares. On September 3, 2026, she sold 15,037 shares, for a combined total of 40,000 shares of Class A common stock.

What prices were received for the GCMG share sales?

The September 2, 2026 sales had a weighted average price of $13.1538 per share, with individual trades between $13.0500 and $13.4500. The September 3, 2026 sales had a weighted average price of $13.1648, with trades between $13.0200 and $13.3500.

Were the GCMG insider sales made under a Rule 10b5-1 trading plan?

No. The Form 4 indicates that no Rule 10b5-1 trading plan is reported for these transactions, meaning the sales are not affirmatively disclosed as being made under a pre-arranged trading plan.

What position does the insider hold at GCM Grosvenor Inc. (GCMG)?

The reporting person, Kathleen Patricia Sullivan, is identified as the company’s Principal Accounting Officer, making her an executive officer of GCM Grosvenor Inc.

Can investors get more detail on the exact trade prices for the GCMG insider sales?

Yes. The insider undertakes to provide full information on the number of shares sold at each separate price within the reported ranges to the issuer, any security holder, or SEC staff upon request.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/03/2026 - 05:01 PM Accepted by SEC EDGAR 09/03/2026 - 04:45 PM Learn about SEC filing dates

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^*

SULLIVAN KATHLEEN PATRICIA

(Last) (First) (Middle)

C/O GCM GROSVENOR INC.

900 NORTH MICHIGAN AVENUE, SUITE 1100

(Street)

CHICAGO ILLINOIS 60611

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
GCM Grosvenor Inc. [ GCMG ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/02/2026

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
Class A Common Stock	09/02/2026		S		24,963	D	$13.1538(1)	59,832	D
Class A Common Stock	09/03/2026		S		15,037	D	$13.1648(2)	44,795	D

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 $13.0500 to $13.4500, inclusive.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.0200 to $13.3500, inclusive.

Remarks:

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, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4.

	/s/ Burke Montgomery, Attorney-in-Fact	09/03/2026
	** 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)