<PAGE>
Filed Pursuant to Rule 424(b)(3)
Registration No. 333-44347
SONIC SOLUTIONS
PROSPECTUS SUPPLEMENT NO. 6
On September 4, 1998, the Company issued to the Selling Stockholder 208,261
shares of Common Stock from the Company (the "Shares) in connection with a
Private Equity Line of Credit Agreement dated as of December 31, 1997 among
the Company and the Selling Stockholder (the "Investment Agreement"). The
attached Prospectus dated January 30, 1998 (the "Prospectus"), relates to the
resale of the Shares. Also attached are the previous prospectus supplements to
the Prospectus, dated February 9, 1998, February 26, 1998, March 19, 1998,
June 23, 1998 and August 10, 1998, respectively. See "Selling Stockholders" in
the Prospectus which is hereby updated by this Prospectus Supplement, as
follows:
SELLING STOCKHOLDERS
The following table sets forth certain information regarding beneficial
ownership of the Company's Common Stock by the Selling Stockholder as of
September 4, 1998. Because a Selling Stockholder may sell some or all of the
Shares offered hereby, and because there are currently no agreements,
arrangements or understandings with respect to the sale of any of the Shares,
no estimate can be given as to the actual amount of Shares that will be held
by the Selling Stockholder after completion of such distribution. See "Plan of
Distribution" in the Prospectus.
<TABLE>
<CAPTION>
COMMON STOCK COMMON STOCK
BENEFICIALLY OWNED BENEFICIALLY
PRIOR TO OWNED
OFFERING COMMON AFTER OFFERING
------------------- STOCK --------------
NUMBER PERCENT (1) TO BE SOLD NUMBER PERCENT
------- ----------- ---------- ------ -------
<S> <C> <C> <C> <C> <C>
Kingsbridge Capital Limited... 208,261 2.3% 208,261 -- --
c/o Kingsbridge Capital
Limited
Main Street, Kilcullen,
County
Kildare, Republic of Ireland
TOTAL:.................... 208,261 2.3% 208,261 -- --
</TABLE>
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(1) Applicable percentage of ownership is based on 8,865,211 shares of Common
Stock outstanding as of September 4, 1998.
The Shares offered hereby by the Selling Stockholder have been acquired
pursuant to the Investment Agreement. Pursuant to the Investment Agreement,
the Selling Stockholder represented to the Company that it was acquiring the
Shares from the Company without any present intention of effecting a
distribution of those shares. However, in connection with the Investment
Agreement, the Company agreed to register the Shares for resale by the Selling
Stockholder to permit such resales from time to time in the market or in
privately-negotiated transactions. The Company will prepare and file such
amendments and supplements to the registration statement as may be necessary
in accordance with the rules and regulations of the Securities Act to keep it
effective for a period of approximately two years.
The Company has agreed to bear certain expenses (other than broker discounts
and commissions, if any) in connection with the registration statement.
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THE DATE OF THIS PROSPECTUS SUPPLEMENT IS SEPTEMBER 4, 1998
