Prospectus Filed Pursuant to Rule 424(b)(3) (424b3)
March 16 2017 - 7:06AM
Edgar (US Regulatory)
Filed
pursuant to Rule 424(b)(3) Registration No. 333-207965
PROSPECTUS SUPPLEMENT
(To Prospectus dated January 12, 2016)
Up to $6,799,771.30 of Shares
Common Stock
This prospectus supplement updates and amends certain
information contained on the cover page of the prospectus, dated January 12, 2016 (the “2016 prospectus”) relating
to the offer and sale of shares of our common stock through Cowen and Company, LLC (“Cowen”), as our exclusive sales
agent for an “at the market offering” program (“ATM Program”). In accordance with the terms of the sales
agreement, dated November 12, 2015, we may offer and sell up to a maximum of $40,000,000 of shares of our common stock from time
to time through Cowen as our sales agent. Of this amount, at March 16, 2017, $40,000,000 remains available for issuance under the
ATM Program. This prospectus supplement should be read in conjunction with the 2016 prospectus, and is qualified by reference to
the 2016 prospectus, except to the extent that the information presented herein supersedes the information contained in the 2016
prospectus. This prospectus supplement is not complete without, and may only be delivered or utilized in connection with, the 2016
prospectus, including any amendments or supplements thereto.
Through March 15, 2017, we have
not sold shares of our common stock through Cowen under the sales agreement. We are filing this prospectus supplement to amend
the 2016 prospectus because we are now subject to General Instruction I.B.6 of Form S-3, which limits the amounts that we may sell
under the registration statement of which this prospectus supplement and the 2016 prospectus are a part. As a result of these limitations
and the current public float of our common stock, and in accordance with the terms of the sales agreement, we may offer and sell
shares of our common stock having an aggregate offering price of up to $6,799,771.30 from time to time through Cowen. If our public
float increases such that we may sell additional amounts under the sales agreement and the registration statement of which this
prospectus supplement and the 2016 prospectus are a part, we will file another prospectus supplement prior to making additional
sales.
Our common stock is listed on The NASDAQ Capital Market
under the symbol “PRTO.” On March 15, 2017, the last reported sale price of our common stock on The NASDAQ Global Market
was $1.70 per share. The aggregate market value of our common stock held by non-affiliates pursuant to General Instruction I.B.6
of Form S-3 is $20,399,313.90, which was calculated based on 9,713,959 shares of our common stock outstanding held by non-affiliates
and at a price of $2.10 per share, the closing price of our common stock on January 25, 2017, a date that is within 60 days of
filing this prospectus supplement. As of the date hereof, we have not offered or sold any securities pursuant to General Instruction
I.B.6 of Form S-3 during the prior 12 calendar month period that ends on and includes the date hereof.
Investing in our common stock involves significant risks.
See “Risk Factors” beginning page 4 of the 2016 prospectus and under the heading “Risk Factors” included
in our most recent annual report on Form 10-K and in our most recent quarterly report on Form 10-Q, and any amendments thereto,
which are incorporated by reference into the 2016 prospectus.
Neither the Securities and Exchange Commission nor any
other regulatory body has approved or disapproved of these securities, or passed upon the accuracy or adequacy of this prospectus
supplement or the 2016 prospectus. Any representation to the contrary is a criminal offense.
Cowen and Company
March 16, 2017
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