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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
1184592	C Beth Seidenberg	C/O Tesaro, Inc. 1000 Winter Street, Suite 3300 Waltham MA 02451		Yes	No	No	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	1,816,748	$0.00	1,816,748	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2012-07-03	153,695	$0.00	153,695	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2012-07-03	204,889	$13.50	2,021,637	No	4	P	Indirect	See footnote
Common Stock	Acquisiton	2012-07-03	17,333	$13.50	171,028	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See footnote
No	4	C	Indirect	See footnote
No	4	P	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	6,358,619	$0.00	1,816,748	$0.00
Common Stock	Series B Preferred Stock	Disposition	2012-07-03	537,932	$0.00	153,695	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect
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 directly by Kleiner Perkins Caufield & Byers XIV, LLC ("KPCB XIV"). The managing member of KPCB XIV is KPCB XIV Associates, LLC ("KPCB XIV Associates"), of which the Reporting Person is a member. The voting and dispositive control over the shares is shares by the members of KPCB XIV Associates. The shares are held for convenience in the name of "KPCB Holdings, Inc. as nominee."
The Reporting Person disclaims beneficial ownership over all Issuer shares held for convenience in the name of "KPCB Holdings, Inc. as nominee," except to the extent of her pecuniary interest therein and this filing is not an admission that the Reporting Person is the beneficial owner of these shares for the purposes of Section 16 or for any other purpose.
The shares are held directly by KPCB XIV Founders Fund, LLC ("KPCB XIV Founders"). The managing member of KPCB XIV Founders is KPCB XIV Associates, LLC ("KPCB XIV Associates"), of which the Reporting Person is a member. The voting and dispositive control over the shares is shares by the members of KPCB XIV Associates. The shares are held for convenience in the name of "KPCB Holdings, Inc. as nominee."