13D Filing: Black Horse Capital LP and Humanigen Inc (HGEN)

1.

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

Black Horse Capital Master Fund Ltd.

2.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a)    [ ]

(b)    [ ]

3.

SEC USE ONLY

4.

SOURCE OF FUNDS

WC

5.

CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)      [ ]

6.

CITIZENSHIP OR PLACE OF ORGANIZATION

Cayman Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7.

SOLE VOTING POWER

0

8.

SHARED VOTING POWER

13,997,832

9.

SOLE DISPOSITIVE POWER

0

10.

SHARED DISPOSITIVE POWER

13,997,832

11.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

13,997,832

12.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
EXCLUDES CERTAIN SHARES    [ ]

13.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

13.1%

14.

TYPE OF REPORTING PERSON

CO