13G Filing: Broadfin Capital and Aratana Therapeutics Inc. (PETX)

CUSIP No

03874P101

Item 1.

(a).

Name of Issuer:

Aratana Therapeutics, Inc.

(b).

Address of Issuer’s Principal Executive Offices:

11400 Tomahawk Creek Parkway, Suite 340

Leawood, Kansas 66211

Item 2.

(a).

Name of Person Filing:

Broadfin Capital, LLC

Broadfin Healthcare Master Fund, Ltd.

Kevin Kotler

(b).

Address of Principal Business Office, or if None, Residence:

Broadfin Capital, LLC

300 Park Avenue, 25^th Floor

New York, New York 10022

United States of America

Broadfin Healthcare Master Fund, Ltd.

20 Genesis Close

Ansbacher House, Second Floor

P.O. Box 1344

Grand Cayman KY1-1108

Cayman Islands

Kevin Kotler

c/o Broadfin Capital, LLC

300 Park Avenue, 25^th Floor

New York, New York 10022

United States of America

(c)

Citizenship:

Broadfin Capital, LLC – Delaware

Broadfin Healthcare Master Fund, Ltd. – Cayman Islands

Kevin Kotler – United States of America

(d).

Title of Class of Securities:

Common Stock, $0.001 par value

(e).

CUSIP Number:

03874P101

Item 3.

This Statement is filed pursuant to ss.240.13d-1(b) or 240.13d-2(b), or (c), check whether the person filing is a

(a)

[_]

Broker or dealer registered under Section 15 of the Exchange Act (15 U.S.C. 78c).

(b)

[_]

Bank as defined in Section 3(a)(6) of the Exchange Act (15 U.S.C. 78c).

(c)

[_]

Insurance company as defined in Section 3(a)(19) of the Exchange Act (15 U.S.C. 78c).

(d)

[_]

Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e)

[_]

An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f)

[_]

An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g)

[_]

A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);

(h)

[_]

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C.1813);

(i)

[_]

A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

[_]

Group, in accordance with s.240.13d-1(b)(1)(ii)(J).