Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

ADAGE CAPITAL PARTNERS GP, L.L.C.

2. Date of Event Requiring Statement (MM/DD/YYYY) 11/17/2020

3. Issuer Name and Ticker or Trading Symbol

GCM Grosvenor Inc. [GCMG]

(Last) (First) (Middle)

200 CLARENDON STREET, 52ND FLOOR,

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

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

(Street)

BOSTON, MA 02116

(City) (State) (Zip)

5. If Amendment, Date Original Filed(MM/DD/YYYY)

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

___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock, $0.0001 par value	5938510	I	See footnote ⁽¹⁾

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)

Explanation of Responses:

(1)

The securities to which this filing relates are held directly by Adage Capital Partners, L.P., a Delaware limited partnership (the "Fund"). Adage Capital Partners GP, L.L.C., a Delaware limited liability company ("ACPGP"), serves as the general partner of the Fund and as such has discretion over the portfolio securities beneficially owned by the Fund. Adage Capital Advisors, L.L.C., a Delaware limited liability company ("ACA"), is the managing member of ACPGP and directs ACPGP's operations. Robert Atchinson and Phillip Gross are the managing members of ACPGP and ACA and general partners of the Fund. Each of the reporting persons disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities and Exchange Act of 1934, as amended, except as to such extent of such reporting person's pecuniary interest in the securities.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
ADAGE CAPITAL PARTNERS GP, L.L.C. 200 CLARENDON STREET, 52ND FLOOR BOSTON, MA 02116		X
Adage Capital Partners, L.P. 200 CLARENDON STREET, 52ND FLOOR BOSTON, MA 02116		X
Adage Capital Advisors, L.L.C. 200 CLARENDON STREET 52ND FLOOR BOSTON, MA 02116		X
Atchinson Robert 200 CLARENDON STREET 52ND FLOOR BOSTON, MA 02116		X
Gross Phillip 200 CLARENDON STREET 52ND FLOOR BOSTON, MA 02116		X

Signatures
/s/ Robert Atchinson		7/13/2021
^**Signature of Reporting Person		Date
/s/ Adage Capital Partners, L.P.; By its general partner Adage Capital Partners GP, L.L.C.; By its managing member Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson		7/13/2021
^**Signature of Reporting Person		Date
/s/ Adage Capital Partners GP, L.L.C.; By its managing member Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson		7/13/2021
^**Signature of Reporting Person		Date
/s/ Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson		7/13/2021
^**Signature of Reporting Person		Date
/s/ Phillip Gross		7/13/2021
^**Signature of Reporting Person		Date