SANTA CLARA, Calif.–(BUSINESS WIRE)–Mar. 4, 2015–
MoSys, Inc. (NASDAQ: MOSY) today announced the closing of an
underwritten public offering of 14,375,000 shares of its common stock at
a price of $1.60 per share, less underwriting discounts and commissions.
The shares sold in the offering reflected the underwriters’ exercise in
full of their over-allotment option to purchase an additional 1,875,000
shares of common stock. After the underwriting discounts and estimated
offering expenses payable by the company, the company expects to receive
net proceeds of approximately $21,300,000. The company’s chief executive
officer and chief operating officer purchased 406,250 shares in the
offering.

Roth Capital Partners acted as the sole book-running manager of the
offering and The Benchmark Company acted as co-manager.

The company intends to use the net proceeds from the offering for
general corporate purposes, including working capital.

The shares of common stock were sold pursuant to the company’s effective
shelf registration statement.

This press release is for informational purposes only and does not
constitute an offer to sell, or a solicitation of an offer to buy these
securities, nor shall there be any sale of these securities in any state
or jurisdiction in which such an offer, solicitation or sale would be
unlawful prior to registration or qualification under the securities
laws of any such state or jurisdiction.

The offering of these securities was made only by means of a prospectus
and related prospectus supplement. Copies of the prospectus supplement
and accompanying base prospectus relating to this offering may be
obtained from Roth Capital Partners, LLC, 888 San Clemente, Newport
Beach, CA
92660, (800) 678-9147.

About MoSys, Inc.

MoSys, Inc. (NASDAQ: MOSY) is a fabless semiconductor company enabling
leading equipment manufacturers in the networking and communications
systems markets to address the continual increase in Internet users,
data and services. More information is available at www.mosys.com.

MoSys is a registered trademark of MoSys, Inc. in the US and/or other
countries. The MoSys logo is a trademark of MoSys, Inc. All other marks
mentioned herein are the property of their respective owners.

Source: MoSys, Inc.

MoSys, Inc.
Jim Sullivan, CFO, +1-408-418-7500
jsullivan@mosys.com
or
Shelton
Group, Investor Relations
Beverly Twing, +1-214-272-0089
Sr.
Acct. Manager
btwing@sheltongroup.com