13G Filing: Perceptive Advisors and Versartis Inc. (VSAR)

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Item 1(a).

Name of Issuer:

Versartis, Inc. (the Issuer)

Item 1(b).

Address of Issuers Principal Executive Offices:

1020 Marsh Road, Menlo
Park, CA 94025

Item 2(a).

Names of Persons Filing:

The names of the persons filing this report
(collectively, the Reporting Persons) are:

Perceptive Advisors LLC (Perceptive Advisors)

Joseph Edelman (Mr. Edelman)

Perceptive Life Sciences Master Fund, Ltd. (the Master Fund)

Item 2(b).

Address of Principal Business Office or, if None, Residence:

The address of the
principal business office of each of the Reporting Persons is:

51 Astor Place, 10th Floor

New York, NY 10003

Item 2(c).

Citizenship:

Perceptive Advisors is a Delaware limited liability company

Mr. Edelman is a United States citizen

The Master Fund is a Cayman Islands corporation

Item 2(d).

Title of Class of Securities:

Common Stock, Par Value $0.0001 Per Share
(Common Stock)

Item 2(e).

CUSIP Number:

92529L 10 2

Item 3.

If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

Not applicable.

Item 4.

Ownership.

The information required by this item with respect to each Reporting
Person is set forth in Rows 5 through 9 and 11 of the cover page to this Schedule 13G. The ownership percentages reported are based on 35,578,470 outstanding shares of Common Stock as of July 31, 2017, as reported in the Issuers Form 10-Q
filed on August 7, 2017.

The Master Fund directly holds 2,099,563 shares of Common Stock. Perceptive Advisors serves as the
investment manager to the Master Fund and may be deemed to beneficially own such shares. Mr. Edelman is the managing member of Perceptive Advisors and may be deemed to beneficially own such shares.