Edgar Filing: NASR KHALED

Ownership Submission

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:

3235-0104

Expires:

January 31, 2005

Estimated average burden hours per response...

0.5

(Print or Type Responses)

1. Name and Address of Reporting Person ^*

Â InterWest Management Partners X, LLC

2. Date of Event Requiring Statement (Month/Day/Year)
06/27/2012

3. Issuer Name and Ticker or Trading Symbol
TESARO, Inc. [TSRO]

(Last)

(First)

(Middle)

2710 SAND HILL ROAD, SUITE 200

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

_____ Director	__X__ 10% Owner
_____ Officer (give title below)	_____ Other (specify below)

5. If Amendment, Date Original Filed(Month/Day/Year)

(Street)

MENLO PARK,Â CAÂ 94025

6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person

(City)

(State)

(Zip)

Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security
(Instr. 4)

2. Amount of Securities Beneficially Owned
(Instr. 4)

3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)

4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series B Preferred Stock	Â ⁽¹⁾	Â ⁽¹⁾	Common Stock	2,627,257	$ ⁽¹⁾	D ⁽²⁾	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
InterWest Management Partners X, LLC 2710 SAND HILL ROAD, SUITE 200 MENLO PARK,Â CAÂ 94025	Â	Â X	Â	Â
Rosch Thomas L 2710 SAND HILL ROAD, SUITE 200 MENLO PARK,Â CAÂ 94025	Â	Â X	Â	Â
Desai Keval 2710 SAND HILL ROAD, SUITE 200 MENLO PARK,Â CAÂ 94025	Â	Â X	Â	Â
NASR KHALED 2710 SAND HILL ROAD, SUITE 200 MENLO PARK,Â CAÂ 94025	Â	Â X	Â	Â

Signatures

/s/ W. Stephen Holmes, Managing Director		06/27/2012
^**Signature of Reporting Person		Date
/s/ Thomas L. Rosch by Karen A. Wilson Power of Attorney		06/27/2012
^**Signature of Reporting Person		Date
/s/ Keval Desai by Karen A. Wilson Power of Attorney		06/27/2012
^**Signature of Reporting Person		Date
/s/ Khaled A. Nasr by Karen A. Wilson Power of Attorney		06/27/2012
^**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The reported securities are convertible at any time, in whole or in part, at the option of the holder, have no expiration date, and will convert into shares of common stock immediately prior to the closing of the Issuer's initial public offering.
(2)	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.
Â Remarks: DueÂ toÂ limitationsÂ ofÂ theÂ EDGARÂ software,Â thisÂ FormÂ 3Â isÂ filedÂ onÂ behalfÂ ofÂ InterWestÂ ManagementÂ PartnersÂ X,Â LLCÂ andÂ certainÂ otherÂ ReportingÂ Persons,Â andÂ isÂ beingÂ filedÂ onÂ twoÂ FormsÂ 3Â (PartÂ IÂ andÂ PartÂ II)Â (collectively,Â theÂ ''InterWestÂ FormÂ 3'').Â ThisÂ filingÂ representsÂ PartÂ IIÂ ofÂ theÂ InterWestÂ FormÂ 3Â andÂ shouldÂ beÂ readÂ togetherÂ withÂ PartÂ I.Â PartÂ IÂ andÂ PartÂ IIÂ ofÂ theÂ InterWestÂ FormÂ 3Â shallÂ constituteÂ oneÂ filing.Â ExhibitÂ ListÂ ExhibitÂ 24.1-Â PowerÂ ofÂ AttorneyÂ ofÂ ThomasÂ L.Â RoschÂ ExhibitÂ 24.2-Â PowerÂ ofÂ AttorneyÂ ofÂ KevalÂ DesaiÂ ExhibitÂ 24.3-Â PowerÂ ofÂ AttorneyÂ ofÂ KhaledÂ A.Â NasrÂ ExhibitÂ 99Â -Â FormÂ 3Â JointÂ FilerÂ Information

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.