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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. ________)*

VERSARTIS, INC.
(Name of Issuer)

Common Stock, par value $0.0001 per share
(Title of Class of Securities)

92529L102
(CUSIP Number)

December 31, 2014
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

[_] Rule 13d-1(b)
[_] Rule 13d-1(c)
[X] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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.

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ITEM 1.

            (a) Name of Issuer: Versartis, Inc. (the "Issuer")

            (b) Address of Issuer's Principal Executive Offices: 4200 Bohannon Drive, Suite 250, Menlo Park, California 94025

ITEM 2.

            (a) Name of Person Filing: This Schedule 13G is being filed jointly by each of the following persons pursuant to Rule 13d-1(k) promulgated by the Securities and Exchange Commission pursuant to Section 13 of the Act: Advent Life Sciences LLP ("Advent"), Advent Life Sciences Fund I LP (the "Advent Fund"), and Shahzad Malik, who was as of December 31, 2014 a general partner of Advent and is a member of the Issuer's board of directors. The foregoing entities and Dr. Malik are individually and collectively referred to herein as the "Reporting Person" or the "Reporting Persons." The Reporting Persons have entered into a Joint Filing Agreement, dated February 13, 2015, a copy of which is attached as Exhibit 1 to this Statement, pursuant to which the Reporting Persons agreed to file this Schedule 13G and any amendments thereto jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act.

            (b) Address of Principal Business Office, or if None, Residence: The principal business office of each of the Reporting Persons is located at 158 North Gower Street, London NW1 2ND, United Kingdom.

            (c) Citizenship: Advent is a limited liability partnership organized under the laws of the United Kingdom. The Advent Fund is a limited partnership organized under the laws of the United Kingdom. Dr. Malik is a citizen of the United Kingdom.

            (d) Title of Class of Securities: Common Stock, $0.0001 par value per share ("Common Stock")

            (e) CUSIP Number: 92529L102

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SS.240.13d -1(b) OR 240.13d -2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:

	(a)	[_]	Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o).
	(b)	[_]	Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).
	(c)	[_]	Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).
	(d)	[_]	Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a- 8).
	(e)	[_]	An investment adviser in accordance with ss.240.13d-1(b)(1)(ii)(E);
	(f)	[_]	An employee benefit plan or endowment fund in accordance with ss.240.13d-1(b)(1)(ii)(F);
	(g)	[_]	A parent holding company or control person in accordance with ss.240.13d-1(b)(1)(ii)(G);
	(h)	[_]	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
	(i)	[_]	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
	(j)	[_]	Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).

ITEM 4. OWNERSHIP.

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

            (a) Amount beneficially owned: As of December 31, 2014, each of the Reporting Persons may be deemed to beneficially own 2,216,558 shares of Common Stock.

            As of December 31, 2014, Advent was the beneficial owner of 89,718 shares of Common Stock, the Advent Fund was the beneficial owner of 2,126,840 shares of Common Stock, and Dr. Malik was the beneficial owner of 0 shares of Common Stock. By virtue of the affiliate relationships among the Reporting Persons, each Reporting Person may be deemed to beneficially own in the aggregate 2,216,558 shares of Common Stock as of December 31, 2014.

            Following December 31, 2014 and prior to the date hereof, Advent purchased 2,226 shares of Common Stock and the Advent Fund purchased 52,774 shares of Common Stock. Dr. Malik, who is a general partner of Advent and a member of the Issuer's board of directors, holds options to purchase a total of 35,000 shares of Common Stock at a price per share of $21.00, none of which are vested on or will vest within 60 days of December 31, 2014 and thus none of the shares of Common Stock underlying those options are deemed owned for beneficial reporting purposes as of December 31, 2014 (however, 8,750 of the options are vested on or will vest within 60 days of February 13, 2015). As a result of the foregoing transactions and occurrences, as of February 13, 2015, Advent and the Advent Fund may be deemed to beneficially own 2,271,558 shares of Common Stock, and Dr. Malik may be deemed to beneficially own 2,280,308 shares of Common Stock.

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            Each Reporting Person disclaims beneficial ownership of the shares of Common Stock except to the extent of any pecuniary interest therein.

            (b) Percent of class: As of December 31, 2014, each of the Reporting Persons may be deemed to beneficially own approximately 9.1% of the outstanding shares of Common Stock.

            All percentages of ownership of Common Stock by the Reporting Persons presented in this Statement are based upon an aggregate of 24,238,337 shares of Common Stock issued and outstanding as of December 15, 2014 as disclosed in the Issuer's prospectus filed pursuant to Rule 424(b)(4) with the Securities and Exchange Commission by the Issuer on January 22, 2015.

            (c) Number of shares as to which such person has:

                   (i) Sole power to vote or to direct the vote See Item 5 on the cover pages hereto.

                   (ii) Shared power to vote or to direct the vote

            See Item 6 on the cover pages hereto.

                   (iii) Sole power to dispose or to direct the disposition of

            See Item 7 on the cover pages hereto.

                   (iv) Shared power to dispose or to direct the disposition of

            See Item 8 on the cover pages hereto.

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [   ].

Not applicable.

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

Not applicable.

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

Not applicable.

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

Not applicable.

ITEM 9. NOTICE OF DISSOLUTION OF GROUP.

Not applicable.

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ITEM 10. CERTIFICATIONS.

Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 13, 2015

	ADVENT LIFE SCIENCES LLP
	By:	/s/ Shahzad Malik
	General Partner of Advent Life Sciences LLP
	ADVENT LIFE SCIENCES FUND I LP
	By:	/s/ Shahzad Malik
	General Partner of Advent Life Sciences LLP
	acting in its capacity as General Partner of
	Advent Life Sciences Fund I LP
	/s/ Shahzad Malik
	SHAHZAD MALIK

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Exhibit 1
AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G

          Each of the undersigned hereby acknowledges and agrees, in compliance with the provisions of Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, that the Schedule 13G to which this Agreement is attached as an Exhibit, and any amendments thereto, will be filed with the Securities and Exchange Commission jointly on behalf of the undersigned. This Agreement may be executed in one or more counterparts. Notwithstanding the foregoing, each of the undersigned disclaim beneficial ownership of the shares of the other, except to the extent of his or its pecuniary interest therein.

Date: February 13, 2015

	ADVENT LIFE SCIENCES LLP
	By:	/s/ Shahzad Malik
	General Partner of Advent Life Sciences LLP
	ADVENT LIFE SCIENCES FUND I LP
	By:	/s/ Shahzad Malik
	General Partner of Advent Life Sciences LLP
	acting in its capacity as General Partner of
	Advent Life Sciences Fund I LP
	/s/ Shahzad Malik
	SHAHZAD MALIK

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