SC 13D

NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

SOLE VOTING POWER

3,375,037

SHARED VOTING POWER

0

SOLE DISPOSITIVE POWER

3,375,037

SHARED DISPOSITIVE POWER

0

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. )*

Imago BioSciences, Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

45250K107

(CUSIP Number)

Robert Liptak

Clarus Ventures, LLC

101 Main Street, Suite 1210

Cambridge, MA 02142

(617) 949-2200

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

July 20, 2021

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

*	The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS Clarus Lifesciences III, L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS Clarus Ventures III GP, L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS Blackstone Clarus III L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS Blackstone Holdings II L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Quebec, Canada

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS Blackstone Holdings I/II GP L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS The Blackstone Group Inc.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS Blackstone Group Management L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 45250K107


1		NAMES OF REPORTING PERSONS Stephen A. Schwarzman
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION United States

Item 1.

Security and Issuer

This Schedule 13D relates to the common stock, par value $0.0001 per share (the “Common Stock”) of Imago BioSciences, Inc., a Delaware corporation (the “Issuer”). The address of the principal executive office of the Issuer is 329 Oyster Point Blvd., 3^rd Floor, South San Francisco, California 94080.

Item 2.

Identity and Background

(a)-(b) Each of the following is hereinafter individually referred to as a “Reporting Person” and collectively as the “Reporting Persons”. This statement is filed on behalf of:

•

Clarus Lifesciences III, L.P. (the “Fund”), a Delaware limited partnership;

•

Clarus Ventures III GP, L.P. (“Clarus GP”), a Delaware limited partnership;

•

Blackstone Clarus III L.L.C., a Delaware limited liability company, Blackstone Holdings II L.P., a Delaware limited partnership, Blackstone Holdings I/II GP L.L.C., a Delaware limited liability company, The Blackstone Group Inc., a Delaware limited partnership (“Blackstone”), Blackstone Group Management L.L.C. a Delaware limited liability company (collectively, with Blackstone Clarus III L.L.C., Blackstone Holdings II L.P., Blackstone Holdings I/II GP L.L.C. and The Blackstone Group Inc., the “Blackstone Entities”); and

•

Stephen A. Schwarzman, a United States citizen.

The address of the principal business office of the Fund and Clarus GP is 101 Main Street, Suite 1210, Cambridge, MA 02142. The address of the principal business office of each of the Blackstone Entities and Mr. Schwarzman is c/o The Blackstone Group Inc., 345 Park Avenue, New York, NY 10154.

Information regarding each director and executive officer of The Blackstone Group Inc. is set forth on Schedule I attached hereto.

(c) The principal business of the Fund is to invest in and assist early-stage and/or growth-oriented businesses in healthcare and life sciences. The principal business of Clarus GP is to act as the general partner of the Fund. The principal business of Blackstone Clarus III L.L.C. is performing the functions of, and serving as, the general partner of Clarus GP. The principal business of Blackstone Holdings II L.P. is performing the functions of, and serving as, a managing member (or similar position) of and member or equity holder in Blackstone Clarus III L.L.C. and other affiliated Blackstone entities. The principal business of Blackstone Holdings I/II GP L.L.C. is performing the functions of, and serving as, the general partner (or similar position) of Blackstone Holdings II L.P. and other affiliated Blackstone entities. The principal business of The Blackstone Group Inc. is performing the functions of, and serving as, the sole member of Blackstone Holdings I/II GP L.L.C., and in a similar capacity for other affiliated Blackstone entities. The principal business of Blackstone Group Management L.L.C. is performing the functions of, and serving as, the sole holder of the Series II preferred stock of The Blackstone Group Inc. The principal occupation of Mr. Schwarzman is serving as an executive of the Blackstone Group Inc. and Blackstone Group Management L.L.C.

(d) During the last five years, none of the Reporting Persons or, to the best knowledge of the Reporting Persons, any of the other persons set forth on Schedule I attached hereto, has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, none of the Reporting Persons or, to the best knowledge of the Reporting Persons, any of the other persons set forth on Schedule I attached hereto, has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) See Item 2(a)-(b) above for citizenship or place of organization, as applicable, of each of the Reporting Persons.

Item 3.

Source and Amount of Funds or Other Consideration

Prior to the Issuer’s initial public offering (the “IPO”), the Fund purchased the following shares of preferred stock (with numbers reflecting the 8.4-for-1 reverse stock split effective July 13, 2021): (a) 1,872,217 shares of Series A Convertible Preferred Stock of the Issuer for an aggregate of $13,367,644, (b) 148,267 shares of Series B Convertible Preferred Stock of the Issuer in repayment of a previously outstanding note in the amount of $846,905 principal plus accrued interest, (c) 1,007,422 shares of Series B Convertible Preferred Stock of the Issuer for an aggregate of $5,754,401 and (d) 197,131 shares of Series C Convertible Preferred Stock of the Issuer for an aggregate of $2,000,000. Immediately prior to the closing of the IPO, each shares of Issuer preferred stock described above automatically converted on a 1-for-1 basis into Common Stock for no additional consideration.

On July 20, 2021, at the closing of the IPO, the Fund purchased 150,000 shares of Common Stock for $16.00 per share.

The Fund’s payment of the aggregate purchase price described above was funded by capital contributions by the Fund’s partners.

Item 4.

Purpose of Transaction

The Reporting Persons acquired the securities reported herein for investment purposes, subject to the following:

The information in Item 6 of this Schedule 13D is incorporated herein by reference.

The Reporting Persons intend to review their investment in the Issuer on an ongoing basis and, in the course of their review, may take actions (including through their affiliates) with respect to their investment or the Issuer, including communicating with the board of directors of the Issuer (the “Board”), members of management or other security-holders of the Issuer, or other third parties from time to time, taking steps to implement a course of action, including, without limitation, engaging advisors, including legal, financial, regulatory, technical and/or industry advisors, to assist in any review, and evaluating strategic alternatives as they may become available. Such discussions and other actions may relate to various alternative courses of action, including, without limitation, those related to an extraordinary corporate transaction (including, but not limited to a merger, reorganization or liquidation) involving the Issuer or any of its subsidiaries; business combinations involving the Issuer or any of its subsidiaries, a sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries; material asset purchases; the formation of joint ventures with the Issuer or any of its subsidiaries or the entry into other material projects; changes in the present business, operations, strategy, future plans or prospects of the Issuer, financial or governance matters; changes to the Board (including board composition) or management of the Issuer; acting as a participant in debt financings of the Issuer or any of its subsidiaries, changes to the capitalization, ownership structure, dividend policy, business or corporate structure or governance documents of the Issuer; de-listing or de-registration of the Issuer’s securities, or any action similar to those enumerated above.

Such discussions and actions may be preliminary and exploratory in nature, and not rise to the level of a plan or proposal. Subject to the terms and conditions of the documents described herein to which the Reporting Persons are a party, the the Reporting Persons or their affiliates may seek to acquire securities of the Issuer, including Common Stock and/or other equity, debt, notes or other financial instruments related to the Issuer or the Common Stock (which may include rights or securities exercisable or convertible into securities of the Issuer), and/or sell or otherwise dispose of some or all of such Issuer securities or financial instruments (which may include distributing some or all of such securities to such Reporting Person’s respective partners or beneficiaries, as applicable) from time to time, in each case, in open market or private transactions, block sales or otherwise. Any transaction that any of the Reporting Persons or their affiliates may pursue, subject to the terms and conditions of the documents described herein to which the Reporting Persons are a party, may be made at any time and from time to time without prior notice and will depend on a variety of factors, including, without limitation, the price and availability of the Issuer’s securities or other financial instruments, the Reporting Persons’ or such affiliates’ trading and investment strategies, subsequent developments affecting the Issuer, the Issuer’s business and the Issuer’s prospects, other investment and business opportunities available to such Reporting Persons and their affiliates, general industry and economic conditions, the securities markets in general, tax considerations and other factors deemed relevant by such Reporting Persons and such affiliates.

Dennis Henner, Ph.D, an Executive Advisor of Blackstone and/or one of its affiliates, serves as a member of the Board and, in such capacity, may have influence over the corporate activities of the Issuer, including activities which may relate to items described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

Except as described in this Schedule 13D, the Reporting Persons do not have any present plans or proposals that relate to or would result in any of the actions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D, although, subject to the agreements described herein, the Reporting Persons, at any time and from time to time, may review, reconsider and change their position and/or change their purpose and/or develop such plans and may seek to influence management or the Board of the Issuer with respect to the business and affairs of the Issuer and may from time to time consider pursuing or proposing such matters with advisors, the Issuer or other persons.

Item 5.

Interest in Securities of the Issuer

(a) and (b) Calculations of the percentage of the shares of Common Stock beneficially owned assumes that there were 32,155,655 shares of Common Stock outstanding immediately following the closing of the Issuer’s initial public offering on July 20, 2021, based on information set forth in the prospectus on Form 424B4 filed by the Issuer on July 16, 2021.

The aggregate number and percentage of the Common Stock beneficially owned by each Reporting Person and, for each Reporting Person, the number of shares as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or to direct the disposition are set forth on rows 7 through 11 and row 13 of the cover pages of this Schedule 13D and are incorporated herein by reference.

As of the date hereof, the Fund directly holds 3,375,037 shares of Common Stock.

Clarus GP is the general partner of the Fund. Blackstone Clarus III L.L.C. is the general partner of Clarus GP. The sole member of Blackstone Clarus III L.L.C. is Blackstone Holdings II L.P. The general partner of Blackstone Holdings II L.P. is Blackstone Holdings I/II GP L.L.C. The sole member of Blackstone Holdings I/II GP L.L.C. is The Blackstone Group Inc. The sole holder of the Series II preferred stock of The Blackstone Group Inc. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly-owned by Blackstone’s senior managing directors and controlled by its founder, Stephen A. Schwarzman.

Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that any Reporting Person is the beneficial owner of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose and each of the Reporting Persons expressly disclaims beneficial ownership of such shares of Common Stock.

Any beneficial ownership of Common Stock by any of the persons listed on Schedule I is set forth on Schedule I attached hereto.

(c) Except as set forth in this Schedule 13D, none of the Reporting Persons or, to the best knowledge of the Reporting Persons, any other person named in Schedule I, has effected any transaction in Common Stock in the past 60 days.

(d) To the best knowledge of the Reporting Persons, no one other than the Reporting Persons, or the partners, members, affiliates or shareholders of the Reporting Persons, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Stock reported herein as beneficially owned by the Reporting Persons.

(e) Not applicable.

Item 6.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

Investors’ Rights Agreement

On November 12, 2020, the Fund, the Issuer and other parties thereto entered into an Amended and Restated Investor Rights Agreement (the “Investors’ Rights Agreement”), pursuant to which certain shareholders of the Issuer are entitled to certain demand registration rights, piggyback registration rights and S-3 registration rights. The Investors’ Rights Agreement also provides that the Issuer will pay certain expenses relating to such registrations and indemnify the registration rights holders against certain liabilities which may arise under the Securities Act of 1933, as amended.

Lock-Up Agreement

In connection with the IPO, on July 2, 2021, the Fund entered into a lock-up agreement (the “Lock-Up Agreement”) with Jeffries LLC, Cowen and Company, LLC, Stifel, Nicolaus & Company, Incorporated, and Guggenheim Securities LLC (collectively, the “Underwriters”), pursuant to which the Fund agreed that for a period of 180 days after the date of the prospectus used to sell the shares of Common Stock in the IPO, without the prior written consent of the Underwriters and subject to limited exceptions, it will not offer, pledge or sell any of the shares of Common Stock or securities convertible into or exchangeable for shares of Common Stock or enter into any hedging, swap, or other agreement or transaction that transfers any of the economic consequences of ownership of the Common Stock.

The description of the Investors’ Rights Agreement and Lock-up Agreement contained in this Item 6 are not intended to be complete and are qualified in their entirety by reference to such agreements, which are filed as exhibits hereto and incorporated by reference herein.

Item 7.

Material to be Filed as Exhibits


Exhibit A		Joint Filing Agreement, dated as of July 30, 2021, by and among the Reporting Persons (filed herewith).

Exhibit B		Investors’ Rights Agreement, dated as of November 12, 2021, by and among the Fund, the Issuer and certain other parties thereto (incorporated by reference to Exhibit 10.1 to the Issuer’s Registration Statement on Form S-1 filed on June 25, 2021).

Exhibit C		Lock-up Agreement (filed herewith).

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: July 30 2021


CLARUS LIFESCIENCES III, L.P.
By:		Clarus Ventures III GP, L.P., its general partner
By:		Blackstone Clarus III, L.L.C., its general partner
By:		Blackstone Holdings II L.P., its managing member
By:		Blackstone Holdings I/II GP L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

CLARUS VENTURES III GP, L.P.
By:		Blackstone Clarus III, L.L.C., its general partner
By:		Blackstone Holdings II L.P., its managing member
By:		Blackstone Holdings I/II GP L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE CLARUS III L.L.C.
By:		Blackstone Holdings II L.P., its managing member
By:		Blackstone Holdings I/II GP L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE HOLDINGS II L.P.
By:		Blackstone Holdings I/II GP L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director


BLACKSTONE HOLDINGS I/II GP L.L.C.

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

THE BLACKSTONE GROUP INC.

By:		/s/ Tabea Hsi
Name:		Tabea Hsi
Title:		Senior Managing Director

BLACKSTONE GROUP MANAGEMENT L.L.C.

By:		/s/ Tabea Hsi
Name:		Tabea Hsi
Title:		Senior Managing Director

/s/ Stephen A. Schwarzman
Stephen A. Schwarzman

[Imago BioSciences, Inc. – Schedule 13D]

SCHEDULE I

Executive Officers and Directors of The Blackstone Group Inc.

The name and principal occupation of each director and executive officer of The Blackstone Group Inc. are set forth below. The address for each person listed below is c/o The Blackstone Group Inc., 345 Park Avenue, New York, New York 10154. All executive officers and directors listed are United States citizens other than The Honorable Brian Mulroney, who is a citizen of Canada, and Sir John Antony Hood, who is a citizen of New Zealand.

OFFICERS:


Name		Present Principal Occupation or Employment
Stephen A. Schwarzman		Founder, Chairman and Chief Executive Officer of The Blackstone Group Inc.

Jonathan D. Gray		President, Chief Operating Officer of The Blackstone Group Inc.

Hamilton E. James		Executive Vice Chairman of The Blackstone Group Inc.

Michael S. Chae		Chief Financial Officer of The Blackstone Group Inc.

John G. Finley		Chief Legal Officer of The Blackstone Group Inc.

DIRECTORS:


Name		Present Principal Occupation or Employment
Stephen A. Schwarzman		Founder, Chairman and Chief Executive Officer of The Blackstone Group Inc.

Jonathan D. Gray		President, Chief Operating Officer of The Blackstone Group Inc.

Hamilton E. James		Executive Vice Chairman of The Blackstone Group Inc.

Kelly A. Ayotte		Former United States Senator from New Hampshire

Joseph P. Baratta		Global Head of Private Equity at The Blackstone Group Inc.

James W. Breyer		Founder and Chief Executive Officer of Breyer Capital

Reginald J. Brown		Partner for the law firm, WilmerHale

Sir John Antony Hood		President and Chief Executive Officer of the Robertson Foundation and Chair of the Rhodes Trust

Rochelle B. Lazarus		Chairman Emeritus & Former Chief Executive Officer, Ogilvy & Mather Worldwide


Jay O. Light		Dean Emeritus, Harvard Business School

The Right Honorable Brian Mulroney		Senior Partner and International Business Consultant for the Montreal law firm, Norton Rose Canada LLP

William G. Parrett		Retired CEO and Senior Partner, Deloitte (Deloitte Touche Tohmatsu)

Ruth Porat		Chief Financial Officer of Alphabet Inc. and Google Inc.

Except as set forth in this Schedule 13D, to the best knowledge of the Reporting Persons, none of the individuals listed above beneficially owns any shares of Common Stock.