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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1509190	Aratana Therapeutics Inc.	PETX	Pharmaceutical Preparations (2834)	383826477

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1473930	Todd Foley	C/O Mpm Asset Management 200 Clarendon Street, 54Th Floor Boston MA 02116		No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2014-03-07	12,539	$19.95	0	No	4	S	Indirect	By The Todd Foley Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By The Todd Foley Trust

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	3,351,048	Indirect	See Footnote

Footnotes

Form 4 filed on March 5, 2014 incorrectly reported the shares held by The Todd Foley Trust as 12,393. The actual number of shares acquired on March 3, 2014 was 12,539.
The price in Column 4 is a weighted average sale price. The prices actually received ranged from $19.94 to $19.95. The Reporting Person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range.
The shares are held as follows: 3,225,494 by MPM BioVentures V, L.P. ("BV V") and 125,554 by MPM Asset Management Investors BV5 LLC ("AM BV5"). MPM BioVentures V GP LLC and MPM BioVentures V LLC ("BV LLC") are the direct and indirect general partners of BV V and BV LLC is the manager of AM BV5. The Reporting Person is a member of BV LLC. The Reporting Person disclaims beneficial ownership of the securities except to the extent of his pecuniary interest therein.