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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1491576	Tesaro Inc.	TSRO	()	4

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	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	2016-03-18	142,085	$35.19	2,013,786	No	4	P	Indirect	By partnership

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By partnership

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	6,614	Indirect	By partnership
Common Stock	1,003	Indirect	By corporation
Common Stock	2,479	Direct

Footnotes

The shares were acquired upon the closing of a private placement that was publicly disclosed by the Issuer on February 25, 2016.
The shares are owned by InterWest Partners X, LP ("IW10"). The Reporting Person is a managing director of InterWest Management Partners X, LLC ("IMP10"), the general partner of IW10, and disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
This number reflects that 6,614 shares previously reported as being owned directly were assigned to IMP10.
The shares are beneficially owned by IMP10. The Reporting Person is a managing director of IMP10, and disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.
This number reflects that 1,003 shares previously reported as being owned directly were assigned to InterWest Venture Management Company ("IVMC").
The shares are beneficially owned by IVMC. The Reporting Person is an officer and director of IVMC and may be deemed to own beneficially the shares held by IVMC.