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NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON
WITH

SOLE VOTING POWER

0 shares

SHARED VOTING POWER

3,816,951 shares

SOLE DISPOSITIVE POWER

0 shares

SHARED DISPOSITIVE POWER

3,816,951 shares

Accession Number:: 0001193125-19-006218
Form Type:: 13D Filing
Publication Date:: 2019-01-10 18:18:03

Filed By:: Clarus Lifesciences Iii, L.p.
Company:: Forty Seven Inc. (NASDAQ:FTSV)
Filing Date:: 2019-01-11
SEC Url:: 13D Filing

Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Name	Sole Voting Power	Shared Voting Power	Sole Dispositive Power	Shared Dispositive Power	Aggregate Amount Owned Power	Percent of Class
Clarus Lifesciences III	0	3,816,951	0	3,816,951	3,816,951	12.3%
Clarus Ventures III GP	0	3,816,951	0	3,816,951	3,816,951	12.3%
Clarus Ventures III	0	0	0	0	0	0.0%
Blackstone Clarus III	0	3,816,951	0	3,816,951	3,816,951	12.3%
Blackstone Holdings II	0	3,816,951	0	3,816,951	3,816,951	12.3%
Blackstone Holdings I II GP Inc	0	3,816,951	0	3,816,951	3,816,951	12.3%
The Blackstone Group	0	3,816,951	0	3,816,951	3,816,951	12.3%
Blackstone Group Management	0	3,816,951	0	3,816,951	3,816,951	12.3%
Stephen A. Schwarzman	0	3,816,951	0	3,816,951	3,816,951	12.3%
Robert Liptak	0	0	0	0	0	0.0%
Nicholas Simon	0	0	0	0	0	0.0%
Nicholas Galakatos	0	0	0	0	0	0.0%
Dennis Henner	20,645	0	20,645	0	20,645	Less than 0.1%
Kurt Wheeler	0	0	0	0	0	0.0%
Scott Requadt	0	0	0	0	0	0.0%

Filing

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

Forty Seven, Inc.

(Name of Issuer)

Common Stock, $.0001 par value per share

(Title of Class of Securities)

34983P104

(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)

January 4, 2019

(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 §240.13d-7 for other parties to whom copies are to be sent.

*	The remainder of this cover page shall be filled out for a reporting persons 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. 34983P104		13D		Page 2 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). 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) WC
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. 34983P104		13D		Page 3 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). 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) AF
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. 34983P104		13D		Page 4 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Clarus Ventures III, LLC
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) AF
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. 34983P104		13D		Page 5 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). 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) AF
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. 34983P104		13D		Page 6 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). 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) AF
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. 34983P104		13D		Page 7 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Blackstone Holdings I/II GP 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) AF
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. 34983P104		13D		Page 8 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). The Blackstone Group 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) AF
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. 34983P104		13D		Page 9 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). 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) AF
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. 34983P104		13D		Page 10 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). 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) AF
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 citizen


CUSIP No. 34983P104		13D		Page 11 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Robert Liptak
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) AF
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 citizen


CUSIP No. 34983P104		13D		Page 12 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Nicholas Simon
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) AF
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 citizen


CUSIP No. 34983P104		13D		Page 13 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Nicholas Galakatos
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) AF
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 citizen


CUSIP No. 34983P104		13D		Page 14 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Dennis Henner
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) AF
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 citizen


CUSIP No. 34983P104		13D		Page 15 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Kurt Wheeler
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) AF
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 citizen


CUSIP No. 34983P104		13D		Page 16 of 24 Pages


1		NAMES OF REPORTING PERSONS. I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY). Scott Requadt
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) AF
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 citizen


CUSIP No. 34983P104		13D		Page 17 of 24 Pages

Schedule 13D

Item 1. Security and Issuer.

This Amendment No. 1 (Amendment No. 1) to the statement on Schedule 13D amends and supplements the statement on Schedule 13D originally filed on July 12, 2018 (the Original 13D) relating to the Common Stock, par value $0.0001 per share (the Common Stock), of Forty Seven, Inc. (the Issuer). The address of the principal executive offices of the Issuer is 1490 OBrien Drive, Suite A, Menlo Park, California 94025.

This Amendment No. 1 is being filed in connection with the acquisition by The Blackstone Group L.P. and certain of its affiliates (Blackstone) of Clarus Ventures, LLC and certain of its affiliates (collectively, Clarus). On January 4, 2019, Blackstone integrated the Clarus business into Blackstone (the Clarus Integration). As a result of such integration, Blackstone may be deemed to have become the beneficial owner of the securities beneficially owned by Clarus, including the securities of the Issuer.

Certain terms used but not defined in this Amendment No. 1 have the meanings assigned thereto in the Original 13D. Except as specifically provided herein, this Amendment No. 1 does not modify any of the information previously reported on the Original 13D.

Item 2. Identity and Background.

This statement is being filed by:

(a) Clarus Lifesciences III, L.P. (the Fund);

(b) Clarus Ventures III GP, L.P. (Clarus GP), which is the sole general partner of the Fund;

(c) Blackstone Clarus III L.L.C., which is the sole general partner of Clarus GP, Blackstone Holdings II L.P., which is the sole member of Blackstone Clarus III L.L.C., Blackstone Holdings I/II GP Inc., which is the sole general partner of Blackstone Holdings II L.P., The Blackstone Group L.P., which is the controlling shareholder of Blackstone Holdings I/II GP Inc., and Blackstone Group Management L.L.C. (collectively, with Blackstone Clarus III L.L.C., Blackstone Holdings II L.P., Blackstone Holdings I/II GP Inc. and The Blackstone Group L.P., the Control Entities), which is the sole general partner of The Blackstone Group L.P. and which is wholly-owned by Blackstones senior managing directors and controlled by its founder, Stephen A. Schwarzman; and

(d) Clarus Ventures III, LLC (Clarus GP LLC) and Robert Liptak, Nicholas Simon, Nicholas Galakatos, Dennis Henner, Kurt Wheeler and Scott Requadt (together, the Managing Directors, and collectively with Clarus GP LLC, the Clarus Persons). The Managing Directors are the members of Clarus GP LLC. Clarus GP LLC is the former general partner of Clarus GP.

The persons named in this Item 2 are referred to individually herein as a Reporting Person and collectively as the Reporting Persons. The Reporting Persons have entered into a Joint Filing Agreement, dated as of the date hereof, a copy of which is filed with this Schedule 13D as Exhibit 99.1 (which is incorporated herein by reference), pursuant to which the Reporting Persons have agreed to file this statement jointly in accordance with the provisions of Rule 13d-1(k) under the Act.

The address of the principal business office of the Fund, Clarus GP and each of the Clarus Persons other than Mr. Requadt is Clarus Ventures, 101 Main Street, Suite 1210, Cambridge, MA 02142. The address of the principal business office of Mr. Requadt is 15 Lewis Path, Wayland, MA 01778. The address of the principal business office of each of the Control Entities and Mr. Schwarzman is c/o The Blackstone Group L.P., 345 Park Avenue, New York, NY 10154.


CUSIP No. 34983P104		13D		Page 18 of 24 Pages

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 sole general partner of the Fund. The principal business of Clarus GP LLC is to act as a general partner of investment vehicles. The principal business of each of the Managing Directors other than Mr. Requadt is serving as an employee of Blackstone or one of its affiliates with similar businesses. The principal business of Mr. Requadt is serving as an executive of life sciences companies.

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 Inc. 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 L.P. is performing the functions of, and serving as, the controlling shareholder of Blackstone Holdings I/II GP, Inc., 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 general partner of The Blackstone Group L.P. The principal occupation of Mr. Schwarzman is serving as an executive of Blackstone Group Management L.L.C.

During the five years prior to the date hereof, none of the Reporting Persons has been convicted in a criminal proceeding or has been a party to a civil proceeding ending in 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.

The Fund, Clarus GP, Blackstone Holdings II L.P. and The Blackstone Group L.P. are limited partnerships organized under the laws of the State of Delaware. Blackstone Clarus III L.L.C., Blackstone Group Management L.L.C. and Clarus GP LLC are limited liability companies organized under the laws of the State of Delaware. Blackstone Holdings I/II GP Inc. is a corporation organized under the laws of the State of Delaware. Each of Mr. Schwarzman and the Managing Directors is a United States citizen.

Item 3. Source and Amount of Funds or Other Consideration.

On January 4, 2019, Blackstone integrated the Clarus business into Blackstone. As a result of the Clarus Integration, the Control Entities and Mr. Schwarzman may be deemed to have become indirect beneficial owners of the shares of Common Stock beneficially owned by the Fund (the Clarus Shares).

Item 5. Interest in Securities of the Issuer.

(a)

The Fund is the record owner of the Clarus Shares. Mr. Henner is the record owner of options exercisable for 20,645 shares of Common Stock.

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


CUSIP No. 34983P104		13D		Page 19 of 24 Pages

Each such Reporting Person may (other than the Clarus Persons) be deemed to beneficially own the Common Stock beneficially owned by the Fund, but neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that any Reporting Person (other than the Fund and Mr. Henner to the extent they directly hold the Issuer securities reported herein) 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 (the Exchange Act), or for any other purpose, and each of the Reporting Persons expressly disclaims beneficial ownership of such Common Stock.

The percentage of outstanding Common Stock of the Issuer which may be deemed to be beneficially owned by each Reporting Person is set forth on Line 13 of such Reporting Persons cover sheet and was calculated based on the 31,064,600 shares of Common Stock reported to be outstanding as of November 2, 2018 in the Issuers Form 10-Q filed with the Securities and Exchange Commission on November 13, 2018.

(b)

Regarding the number of shares as to which such person has:

(i)

sole power to vote or to direct the vote: See line 7 of cover sheets

(ii)

shared power to vote or to direct the vote: See line 8 of cover sheets

(iii)

sole power to dispose or to direct the disposition: See line 9 of cover sheets

(iv)

shared power to dispose or to direct the disposition: See line 10 of cover sheets

(c)

Except as set forth in this Amendment No. 1, none of the Reporting Persons has effected any transaction in the Common Stock during the last 60 days.

(d)

To the best knowledge of the Reporting Persons, no person 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 securities beneficially owned by the Reporting Persons identified in this Item 5.

(e)

As of the date of the Clarus Integration, the Clarus Persons were not the beneficial owners of more than five percent of the outstanding shares of Common Stock.

Item 6. Contracts, Arrangements, Undertakings or Relationships with Respect to Securities of the Issuer.

Pursuant to Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the Reporting Persons have entered into an agreement with respect to the joint filing of this statement, and any amendment or amendments thereto.

Item 7. Material to be Filed as Exhibits.


CUSIP No. 34983P104		13D		Page 20 of 24 Pages

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.

Date: January 10, 2019

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 Inc., its general partner


By:		/s/ John G. Finley


Name:		John G. Finley
Title:		Chief Legal Officer

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 Inc., its general partner


By:		/s/ John G. Finley


Name:		John G. Finley
Title:		Chief Legal Officer

BLACKSTONE CLARUS III L.L.C.

By: Blackstone Holdings II L.P., its managing member

By: Blackstone Holdings I/II GP Inc., its general partner


By:		/s/ John G. Finley


Name:		John G. Finley
Title:		Chief Legal Officer

BLACKSTONE HOLDINGS II L.P.

By: Blackstone Holdings I/II GP Inc., its general partner


By:		/s/ John G. Finley


Name:		John G. Finley
Title:		Chief Legal Officer

BLACKSTONE HOLDINGS I/II GP INC.


By:		/s/ John G. Finley


Name:		John G. Finley
Title:		Chief Legal Officer

[Forty Seven, Inc. - Schedule 13D/A]


CUSIP No. 34983P104		13D		Page 21 of 24 Pages

THE BLACKSTONE GROUP L.P.

By: Blackstone Group Management L.L.C., its general partner


By:		/s/ John G. Finley


Name:		John G. Finley
Title:		Chief Legal Officer


BLACKSTONE GROUP MANAGEMENT L.L.C.



By:		/s/ John G. Finley


Name:		John G. Finley
Title:		Chief Legal Officer

/s/ Stephen A. Schwarzman

Stephen A. Schwarzman


CLARUS VENTURES III, LLC

By:		/s/ Robert Liptak

Name:

Robert Liptak

Title:

Manager

Nicholas Galakatos

Dennis Henner

/s/ Robert Liptak

Robert Liptak

Nicholas Simon

Kurt Wheeler

Scott Requadt


*By:		/s/ Robert Liptak
		Robert Liptak, as Attorney-in-Fact

This Amendment No. 1 to Schedule 13D was executed by Robert Liptak on behalf of the individuals listed above pursuant to a Power of Attorney a copy of which is attached as Exhibit 99.2.

[Forty Seven, Inc. - Schedule 13D/A]