13G Filing: Sabby Capital and Arca Biopharma Inc. (ABIO)

Not applicable

Item 7.
Identification and Classification of the Subsidiary Which Acquired the
Security Being Reported on by the Parent Holding Company or Control
Person.Not applicable

Item 8.
Identification and Classification of Members of the Group.Not applicable

Item 9.
Notice of Dissolution of Group.Not applicable

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Item 10.
Certification.By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing the control
of the issuer of the securities and were not acquired and are not held in
connection with or as a participant in any transaction having that
purpose or effect.

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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.

January 4, 2018

(Date)Sabby Healthcare Master Fund, Ltd.

By: /s/ Harry Thompson
Name: Harry Thompson
Title: Authorized Person of TDF Management Ltd.,
a Director

Sabby Volatility Warrant Master Fund, Ltd.

By: /s/ Harry Thompson
Name: Harry Thompson
Title: Authorized Person of TDF Management Ltd.,
a Director

Sabby Management, LLC*

By: /s/ Robert Grundstein
Name: Robert Grundstein
Title: Chief Operating Officer