Filed Pursuant to Rule 424(b)(5)
Registration No. 333-217034
Prospectus supplement
(to prospectus dated March 30, 2017)
2,767,356 Common Units, Each Consisting of One Share of Common Stock and a Warrant to Purchase One Share
of Common Stock
1,862,274
Pre-funded
Units, Each Consisting of a
Pre-funded
Warrant to Purchase One Share of Common Stock and a Warrant to Purchase One Share of Common Stock
We are offering 2,767,356 common
units (each a Common Unit), each Common Unit consisting of one share of our common stock and a warrant to purchase one share of our common stock at an exercise price of $5.40 per share of common stock (each a Warrant). Each
Warrant will be exercisable immediately and will expire five years from the date of issuance.
We are also offering 1,862,274
Pre-funded
Units to those purchasers whose purchase of Common Units in this offering would otherwise result in the purchaser, together with its affiliates and certain related parties, beneficially owning more
than 4.99% (or, at the election of the purchaser, 9.99%) of our outstanding common stock immediately following the consummation of this offering, the opportunity to purchase, if the purchaser so chooses,
pre-funded
units (each a
Pre-funded
Unit) in lieu of Common Units that would otherwise result in the purchasers beneficial ownership exceeding 4.99%
(or, at the election of the purchaser, 9.99%) of our outstanding common stock. Each
Pre-funded
Unit will consist of a prefunded warrant to purchase one share of our common stock at an exercise price of $0.01
per share (each a
Pre-funded
Warrant) and a Warrant. The purchase price of each
Pre-funded
Unit is equal to the price per Common Unit being sold to the
public in this offering, minus $0.01. The
Pre-funded
Warrants will be immediately exercisable and may be exercised at any time until all of the
Pre-funded
Warrants are
exercised in full.
Common Units and
Pre-funded
Units will not be issued or certificated. The shares of common stock
or
Pre-funded
Warrants, as the case may be, and the Warrants included in the Common Units or the
Pre-funded
Units, can only be purchased together in this offering, but
the securities contained in the Common Units or
Pre-funded
Units will be issued separately and will be immediately separable upon issuance.
Our common stock is listed on The Nasdaq Global Market under the symbol ALT. On October 5, 2018, the last reported sale price of our common
stock on The Nasdaq Global Market was $7.24 per share.
There is no established public trading market for the Warrants or the
Pre-funded
Warrants, and we do not expect a market to develop. In addition, we do not intend to apply to list the Warrants or the
Pre-funded
Warrants on any national
securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of the Warrants and the
Pre-funded
Warrants will be limited.
We have retained Roth Capital Partners, LLC (Roth) to act as placement agent in connection with this offering. We have agreed to pay the placement
agent the placement agent fees set forth in the table below, which assumes that we sell all of the units we are offering.
Investing in our securities
involves a high degree of risk, including that the trading price of our common stock has been subject to extreme volatility and investors in this offering may not be able to sell their common stock above the actual offering price or at all. Before
making an investment decision, please read the information under the heading
Risk Factors
beginning on page
S-9
of this prospectus supplement and in the documents
incorporated by reference into this prospectus supplement and the accompanying prospectus.
Neither the Securities and Exchange Commission nor any
state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
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Per
Common
Unit
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Per Pre-
funded Unit
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Total
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Public offering price
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$
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5.40
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$
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5.39
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$
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24,981,379
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Placement agent fees(1)
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$
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0.3780
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$
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0.3773
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$
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1,748,697
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Proceeds to us, before expenses
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$
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5.0220
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$
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5.0127
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$
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23,232,683
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(1)
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See Plan of Distribution beginning on page
S-17
of this
prospectus supplement for additional information regarding the compensation payable to the placement agent.
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Delivery of the securities
offered hereby is expected to be made on or about October 10, 2018, subject to the satisfaction of certain conditions.
Placement
Agent
Roth Capital Partners
Prospectus Supplement dated October 8, 2018.