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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	Director	Officer	Large Shareholder	Other
1276600	Khaled Nasr	2710 Sand Hill Road Suite 200 Menlo Park CA 94025	No	No	Yes	No
1460207	Interwest Management Partners X, Llc	2710 Sand Hill Road Suite 200 Menlo Park CA 94025	No	No	Yes	No
1553019	Keval Desai	2710 Sand Hill Road Suite 200 Menlo Park CA 94025	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	Acquisiton	2012-07-03	2,627,257	$0.00	2,627,257	No	4	C	Direct
Common Stock	Acquisiton	2012-07-03	444,444	$13.50	3,071,701	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Direct
No	4	P	Direct

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	Direct

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 beame effective on June 18, 2012
The shares are owned by InterWest Partners X, LP ("IW10"). InterWest Management Partners X, LLC ("IMP10") is the general partner of IW10. Harvey B. Cash, Bruce A. Cleveland, Christopher B. Ehrlich, Philip T. Gianos, W. Stephen Holmes, Nina S. Kjellson, Gilbert H. Kliman, Arnold L. Oronsky, Douglas A. Pepper and Thomas L. Rosch are managing directors of IMP10. Keval Desai and Khaled A. Nasr are venture members of IMP10. Each managing director and venture member of IMP10 disclaims beneficial ownership of such shares, except to the extent of their pecuniary interest therein.