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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1491576	Tesaro Inc.	TSRO	Pharmaceutical Preparations (2834)	272249687

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1207833	L Arnold Oronsky	C/O Tesaro, Inc. 1000 Winter Street, Suite 3300 Waltham MA 02451		Yes	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	Acquisiton	2012-07-03	2,627,257	$0.00	2,627,257	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2012-07-03	444,444	$13.50	3,071,701	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See footnote
No	4	P	Indirect	See footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Preferred Stock	Disposition	2012-07-03	9,195,402	$0.00	2,627,257	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect

Footnotes

The Series B Preferred Stock converted into shares of TESARO, Inc. common stock on a 3.5 for 1 basis immediately prior to the closing of the Issuer's initial public offering and had no expiration date.
Reflects a 1-for-3.5 reverse stock split which became effective prior to the closing of the Issuer's initial public offering.
The shares are held by InterWest Partners X, LP ("IW10"). InterWest Management Partners X, LLC ("IMP10") is the general partner of IW10. The Reporting Person is a managing director of IMP10. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.