<PAGE>
Prospectus Supplement No. 4 Filed Pursuant to Rule 424(b)(3)
dated May 23, 2000 Registration No. 333-30540
(to Prospectus dated April 24, 2000) Cusip No. 501242AE1
$175,000,000
KULICKE AND SOFFA INDUSTRIES, INC.
4 3/4% Convertible Subordinated Notes due 2006 and
The Common Stock issuable upon conversion of the Notes
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The following table supplements and amends the information set forth on
pages 30 to 33 in the prospectus under Selling Securityholders with respect to
the selling securityholders and the principal amount of notes beneficially owned
by such selling securityholders that may be offered and sold pursuant to the
prospectus dated April 24, 2000. This prospectus supplement is not complete
without, and may not be delivered or utilized except in connection with, the
prospectus.
<TABLE>
<CAPTION>
Principal Amount Number of Number of Percentage of
at Maturity of Shares of Shares of Common Stock
Notes Beneficially Percentage Common Stock Common Stock Outstanding
Owned that May of Notes Owned Prior that May (2)
Name Be Sold Outstanding to the Offering Be Sold (1)
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<S> <C> <C> <C> <C> <C>
Morgan Stanley Dean
Witter $10,100,000 5.8% 220,527 220,527 *
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</TABLE>
* Less than 1%
(1) Assumes conversion of all of the holder's notes at a conversion price
of $45.7993 per share of common stock. However, this conversion price
will be subject to adjustment as described under "Description of
Notes-Conversion of Notes." As a result, the amount of common stock
issuable upon conversion of the notes may increase or decrease in the
future.
(2) Calculated based on Rule 13d-3(d)(i) of the Exchange Act using
24,020,358 shares of common stock outstanding as of April 14, 2000. In
calculating this amount, we treated as outstanding the number of
shares of common stock issuable upon conversion of all of that
particular holder's notes. However, we did not assume the conversion
of any other holder's notes.
Because the selling securityholders listed above and in the prospectus
under the caption Selling Securityholders may, pursuant to the prospectus, as
supplemented, offer all or some portion of the notes, no estimate can be given
as to the amount of notes that will be held by the selling securityholders upon
termination of any such sales.
Furthermore, the selling securityholders identified in the table set forth
in the prospectus under the caption Selling Securityholders may have sold,
transferred or otherwise disposed of all or a portion of their notes or common
stock since the date on which they provided us with information regarding their
notes or common stock, and we have not made any independent inquiries as to the
foregoing.
Unless otherwise noted, all information provided in this prospectus
supplement is as of May 23, 2000.
