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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="right" style="font-size: 10pt; margin-top: 12pt">As filed
with the Securities and Exchange Commission on March 29, 2007<BR>
Registration
No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT<BR>
UNDER<BR>
THE SECURITIES ACT OF 1933</B>
</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>PDF SOLUTIONS, INC.</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact Name of Registrant as Specified in Its Charter)</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top">Delaware
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">25-1701361</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(State or Other Jurisdiction of
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(I.R.S. Employer</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">Incorporation or Organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Identification Number)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt">333 West San Carlos Street, Suite&nbsp;700<BR>
San Jose, California 95110<BR>
(Address of Principal Executive Offices) (Zip Code)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>2001 STOCK PLAN<BR>
2001 EMPLOYEE STOCK PURCHASE PLAN</B><BR>
(Full Title of the Plans)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>JOHN K. KIBARIAN<BR>
President and Chief Executive Officer<BR>
PDF Solutions, Inc.<BR>
333 West San Carlos Street, Suite&nbsp;700<BR>
San Jose, California 95110</B><BR>
(Name and Address of Agent for Service)</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>(408)&nbsp;280-7900</B><BR>
(Telephone Number, Including Area Code, of Agent for Service)

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>Copy to</B>:<BR>
<B>Peter Cohn, Esq.<BR>
Orrick, Herrington &#038; Sutcliffe LLP<BR>
1020 Marsh Road<BR>
Menlo Park, California 94025<BR>
(650)&nbsp;614-7400</B>

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>CALCULATION OF REGISTRATION FEE</B>

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="69%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="12%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD><!-- VRule -->
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Amount of</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>Title of Securities to be</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Amount To Be</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Aggregate Offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Registration</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>Registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Registered (1)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Price Per Share (2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Fee</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, $0.00015 par value (2001 Stock Plan)</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">1,397,392</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$10.21</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$14,267,372.32</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$438.01</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, $0.00015 par value (2001 Employee
Stock Purchase Plan)</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">558,956</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$10.21</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$5,706,940.76</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$175.20</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Total</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">1,956,348</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$10.21</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$19,974,313.08</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$613.21</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 3pt; width: 18%; border-top: 0px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>This Registration Statement shall also cover any additional shares of Common Stock which
become issuable under the Plan by reason of any stock dividend, stock split, recapitalization or
other similar transaction effected without the Registrant&#146;s receipt of consideration which
results in an increase in the number of the Registrant&#146;s outstanding shares of Common Stock.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>The Proposed Maximum Offering Price Per Share is calculated in accordance with Rule 457(h)
under the Securities Act of 1933, as amended (the &#147;Securities Act&#148;) solely for the purpose of
calculating the registration fee. With respect to an aggregate of 1,956,348 shares of Common
Stock available for future issuance under the 2001 Stock Plan and 2001 Employee Stock Purchase
Plan, the estimated Proposed Maximum Offering Price Per Share was calculated pursuant to Rules
457(c) and 457(h) under the Securities Act on the basis of
$10.21 per share, the average
of the high and low price of the Common Stock on the Nasdaq National
Market System on March 22, 2007.</TD>
</TR>

</TABLE>



<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>





<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<P><HR noshade><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- TOC -->
<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
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	<TD width="76%"></TD>
</TR>
<TR><TD colspan="9"><A HREF="#000">PART II</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#001">Item&nbsp;3. Incorporation of Documents by Reference</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#002">Item&nbsp;4. Description of Securities</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#003">Item&nbsp;5. Interests of Named Experts and Counsel</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;6. Indemnification of Directors and Officers</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;7. Exemption From Registration Claimed</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#006">Item&nbsp;8. Exhibits</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#007">Item&nbsp;9. Undertakings</A></TD></TR>
<TR><TD colspan="9"><A HREF="#008">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#009">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="f28574exv5w1.htm">EXHIBIT 5.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="f28574exv23w1.htm">EXHIBIT 23.1</A></TD></TR>
</TABLE>
</CENTER>
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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>




<!-- link1 "PART II" -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>

</DIV>
<!-- link2 "Item&nbsp;3. Incorporation of Documents by Reference" -->
<DIV align="left"><A NAME="001"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. Incorporation of Documents by Reference.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">PDF Solutions, Inc. (the &#147;Registrant&#148;) hereby incorporates by reference into this Registration
Statement the following documents previously filed with the Securities and Exchange Commission (the
&#147;Commission&#148;):
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The Registrant&#146;s Annual Report on Form 10-K, as amended, for the fiscal
year ended December&nbsp;31, 2006, filed with the SEC on March&nbsp;16, 2007 (File No.
000-31311);
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) All other reports filed pursuant to Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 (the &#147;Exchange Act&#148;) since the end of the fiscal
year covered by the Registrant document referred to in (a)&nbsp;above; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) The Registrant&#146;s Registration Statement on Form 8-A12G, as amended, filed
with the SEC on August&nbsp;10, 2000 (File No.&nbsp;000-31311), in which are described the
terms, rights and provisions applicable to the Registrant&#146;s Common Stock.
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">All documents subsequently filed by the Registrant pursuant to Sections&nbsp;13(a), 13(c), 14, and 15(d)
of the Exchange Act, prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then remaining unsold, shall
be deemed to be incorporated by reference in this Registration Statement and to be a part hereof
from the date of filing of such documents.
</DIV>

<!-- link2 "Item&nbsp;4. Description of Securities" -->
<DIV align="left"><A NAME="002"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. Description of Securities.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Not applicable.
</DIV>

<!-- link2 "Item&nbsp;5. Interests of Named Experts and Counsel" -->
<DIV align="left"><A NAME="003"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5. Interests of Named Experts and Counsel.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The validity of the common stock being registered hereby will be passed upon for the Registrant by
Orrick, Herrington &#038; Sutcliffe LLP, Menlo Park, California. As of the date of this Registration
Statement, Peter Cohn, a partner of Orrick, Herrington &#038; Sutcliffe LLP, is the Secretary of PDF
Solutions, Inc.
</DIV>

<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers" -->
<DIV align="left"><A NAME="004"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. Indemnification of Directors and Officers.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Section&nbsp;145 of the Delaware General Corporation Law provides that a corporation may indemnify
directors and officers, as well as other employees and individuals, against expenses (including
attorneys&#146; fees), judgments, fines and amounts paid in settlement actually and reasonably incurred
by any such person in connection with any threatened, pending or completed actions, suits or
proceedings in which such person is made a party by reason of such person being or having been a
director, officer, employee or agent of the Registrant. The Delaware General Corporation Law
provides that Section&nbsp;145 is not exclusive of other rights to which those seeking indemnification
may be entitled under any bylaw, agreement, vote of stockholders or disinterested directors or
otherwise. Article&nbsp;XII of the Registrant&#146;s Amended and Restated Certificate of Incorporation and
Article&nbsp;VI of the Registrant&#146;s Bylaws provide for indemnification by the Registrant of its
directors and officers to the fullest extent permitted by the Delaware General Corporation Law.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Section&nbsp;102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in its
certificate of incorporation that a director of the corporation shall not be personally liable to
the corporation or its stockholders for monetary damages for breach of fiduciary duty as a
director, except for liability (i)&nbsp;for any breach of the director&#146;s duty of loyalty to the
corporation or its stockholders, (ii)&nbsp;for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii)&nbsp;for unlawful payments of dividends or
unlawful stock repurchases, redemptions or other distributions, or (iv)&nbsp;for any transaction from
which the director derived an improper personal benefit. The Registrant&#146;s Amended and Restated
Certificate of Incorporation provides for such limitation of liability.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Registrant has obtained directors&#146; and officers&#146; insurance providing indemnification for
certain of the Registrant&#146;s directors, officers and employees for certain liabilities.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->2<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Registrant has entered into indemnification agreements with each director and executive officer
which provide indemnification under certain circumstances for acts and omissions which may not be
covered by any directors&#146; and officers&#146; liability insurance.
</DIV>

<!-- link2 "Item&nbsp;7. Exemption From Registration Claimed" -->
<DIV align="left"><A NAME="005"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7. Exemption From Registration Claimed.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Not applicable.
</DIV>

<!-- link2 "Item&nbsp;8. Exhibits" -->
<DIV align="left"><A NAME="006"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="8%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="87%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Name</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;&nbsp;5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Orrick, Herrington &#038; Sutcliffe LLP</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Independent Registered Public Accounting Firm</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Orrick, Herrington &#038; Sutcliffe LLP (included in Exhibit
5.1 to this Registration Statement)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">24
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (See signature page to this Registration Statement)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<!-- link2 "Item&nbsp;9. Undertakings" -->
<DIV align="left"><A NAME="007"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9. Undertakings.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The undersigned Registrant hereby undertakes:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) To include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) To reflect in the prospectus any facts or events arising after the effective date
of the Registration Statement (or the most recent post-effective amendment thereof) which,
individually or in the aggregate, represent a fundamental change in the information set
forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease
in volume of securities offered (if the dollar value of securities offered would not exceed
that which was registered) and any deviation from the low or high end of the estimated
maximum offering range may be reflected in the form of prospectus filed with the Commission
pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no
more than a 20&nbsp;percent change in the maximum aggregate offering price set forth in the
&#147;Calculation of Registration Fee&#148; table in the effective Registration Statement;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) To include any material information with respect to the plan of distribution not
previously disclosed in the Registration Statement or any material change to such
information in the Registration Statement;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%"><I>provided</I>, <I>however</I>, that paragraphs (1)(i) and (1)(ii) do not apply if the information
required to be included in the post-effective amendment by those paragraphs is contained in
periodic reports filed with or furnished to the Commission by the Registrant pursuant to
Section&nbsp;13 or 15(d) of the Exchange Act that are incorporated by reference in this
Registration Statement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) That, for the purpose of determining any liability under the Securities Act, each
such post-effective amendment shall be deemed to be a new registration statement relating to
the securities offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) To remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;The undersigned Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Registrant&#146;s annual report pursuant to
Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an
employee benefit plan&#146;s annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement shall be deemed
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->3<!-- /Folio -->
</DIV>

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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">to be a new Registration Statement relating to the securities offered therein, and the offering of
such securities at that time shall be deemed to be the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;Insofar as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers and controlling persons of the Registrant pursuant to the
foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the
Commission such indemnification is against public policy as expressed in the Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such liabilities (other than
the payment by the Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or proceeding) is asserted
by such director, officer or controlling person in connection with the securities being registered,
the Registrant will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->4<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "SIGNATURES" -->
<DIV align="left"><A NAME="008"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has
duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of San Jose, State of California, on the
29<SUP>th</SUP> day of March, 2007.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left"><B>PDF SOLUTIONS, INC.</B><BR>
(Registrant)<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ John K. Kibarian
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;John K. Kibarian&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;President and Chief Executive Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POWER OF ATTORNEY</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Each of the undersigned directors of PDF Solutions, Inc., a Delaware
corporation (the
&#147;Company&#148;), hereby constitutes and appoints John K. Kibarian and Keith A. Jones, and each of them,
his true and lawful attorneys-in-fact, with full power of substitution, for him or her and in his
or her name, place and stead, in his or her capacity as a director, to execute a Registration
Statement or Registration Statements on Form S-8 under the Securities Act of 1933, as amended,
 relating to 1,956,348 shares of Common Stock that are issuable under
the PDF Solutions, Inc. 2001 Stock Plan  and 2001 Employee Stock Purchase
Plan (the &#147;Plans&#148;) and any and all amendments (including post-effective amendments) to such
Registration Statements, and to file such Registration Statements and any and all amendments
thereto, with exhibits thereto, and other documents in connection therewith, with the Securities
and Exchange Commission, granting unto such attorneys-in-fact full power and authority to do and
perform each and every act and thing necessary or desirable to be done in and about the premises,
as fully to all intents and purposes, as he or she might or could do in person, and ratify and
confirm all that such attorneys-in-fact or their substitutes may lawfully do or cause to be done by
virtue hereof, and hereby consents to such registration of the Shares and the issuance thereof
pursuant to the terms of the Plans. Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the capacities and on the dates
indicated.
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="32%">&nbsp;</TD>
    <TD width="10%">&nbsp;</TD>
    <TD width="33%">&nbsp;</TD>
    <TD width="10%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Signature</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Title</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Date</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ John K. Kibarian
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Executive Officer,
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
John K. Kibarian
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;President
and Director</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Keith A. Jones
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Financial Officer,
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Keith A. Jones
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;Vice
President, Finance</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Kimon Michaels
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Vice President, Field Operations
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Kimon Michaels
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;<FONT style="white-space: nowrap">and
Director</FONT></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Tom Caulfield
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Tom Caulfield
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Lucio L. Lanza
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Lucio L. Lanza
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Sue Billat
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Sue Billat
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Dr.&nbsp;Albert Y. C. Yu
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Dr.&nbsp;Albert Y. C. Yu
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ R. Stephen Heinrichs
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">March 29, 2007</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px"><DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
R. Stephen Heinrichs
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->5<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "EXHIBIT INDEX" -->
<DIV align="left"><A NAME="009"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="8%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="87%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Name</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR><TD>&nbsp;</TD></TR>

<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;&nbsp;5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Orrick, Herrington &#038; Sutcliffe LLP</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Independent Registered Public Accounting Firm</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Orrick, Herrington &#038; Sutcliffe LLP is included in Exhibit
5.1 to this Registration Statement</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">24
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (See signature page to this Registration Statement)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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sv8
Table of Contents
As filed
with the Securities and Exchange Commission on March 29, 2007
Registration
No. 333-
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
PDF SOLUTIONS, INC.
(Exact Name of Registrant as Specified in Its Charter)
Delaware
25-1701361
(State or Other Jurisdiction of
(I.R.S. Employer
Incorporation or Organization)
Identification Number)
333 West San Carlos Street, Suite 700
San Jose, California 95110
(Address of Principal Executive Offices) (Zip Code)
2001 STOCK PLAN
2001 EMPLOYEE STOCK PURCHASE PLAN
(Full Title of the Plans)
JOHN K. KIBARIAN
President and Chief Executive Officer
PDF Solutions, Inc.
333 West San Carlos Street, Suite 700
San Jose, California 95110
(Name and Address of Agent for Service)
(408) 280-7900
(Telephone Number, Including Area Code, of Agent for Service)
Copy to
:
Peter Cohn, Esq.
Orrick, Herrington & Sutcliffe LLP
1020 Marsh Road
Menlo Park, California 94025
(650) 614-7400
CALCULATION OF REGISTRATION FEE
Proposed
Proposed
Maximum
Maximum
Amount of
Title of Securities to be
Amount To Be
Offering
Aggregate Offering
Registration
Registered
Registered (1)
Price Per Share (2)
Price
Fee
Common Stock, $0.00015 par value (2001 Stock Plan)
1,397,392
$10.21
$14,267,372.32
$438.01
Common Stock, $0.00015 par value (2001 Employee
Stock Purchase Plan)
558,956
$10.21
$5,706,940.76
$175.20
Total
1,956,348
$10.21
$19,974,313.08
$613.21
(1)
This Registration Statement shall also cover any additional shares of Common Stock which
become issuable under the Plan by reason of any stock dividend, stock split, recapitalization or
other similar transaction effected without the Registrant's receipt of consideration which
results in an increase in the number of the Registrant's outstanding shares of Common Stock.
(2)
The Proposed Maximum Offering Price Per Share is calculated in accordance with Rule 457(h)
under the Securities Act of 1933, as amended (the "Securities Act") solely for the purpose of
calculating the registration fee. With respect to an aggregate of 1,956,348 shares of Common
Stock available for future issuance under the 2001 Stock Plan and 2001 Employee Stock Purchase
Plan, the estimated Proposed Maximum Offering Price Per Share was calculated pursuant to Rules
457(c) and 457(h) under the Securities Act on the basis of
$10.21 per share, the average
of the high and low price of the Common Stock on the Nasdaq National
Market System on March 22, 2007.
TABLE OF CONTENTS
PART II
Item 3. Incorporation of Documents by Reference
Item 4. Description of Securities
Item 5. Interests of Named Experts and Counsel
Item 6. Indemnification of Directors and Officers
Item 7. Exemption From Registration Claimed
Item 8. Exhibits
Item 9. Undertakings
SIGNATURES
EXHIBIT INDEX
EXHIBIT 5.1
EXHIBIT 23.1
Table of Contents
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
PDF Solutions, Inc. (the "Registrant") hereby incorporates by reference into this Registration
Statement the following documents previously filed with the Securities and Exchange Commission (the
"Commission"):
(a) The Registrant's Annual Report on Form 10-K, as amended, for the fiscal
year ended December 31, 2006, filed with the SEC on March 16, 2007 (File No.
000-31311);
(b) All other reports filed pursuant to Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 (the "Exchange Act") since the end of the fiscal
year covered by the Registrant document referred to in (a) above; and
(c) The Registrant's Registration Statement on Form 8-A12G, as amended, filed
with the SEC on August 10, 2000 (File No. 000-31311), in which are described the
terms, rights and provisions applicable to the Registrant's Common Stock.
All documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14, and 15(d)
of the Exchange Act, prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then remaining unsold, shall
be deemed to be incorporated by reference in this Registration Statement and to be a part hereof
from the date of filing of such documents.
Item 4. Description of Securities.
Not applicable.
Item 5. Interests of Named Experts and Counsel.
The validity of the common stock being registered hereby will be passed upon for the Registrant by
Orrick, Herrington & Sutcliffe LLP, Menlo Park, California. As of the date of this Registration
Statement, Peter Cohn, a partner of Orrick, Herrington & Sutcliffe LLP, is the Secretary of PDF
Solutions, Inc.
Item 6. Indemnification of Directors and Officers.
Section 145 of the Delaware General Corporation Law provides that a corporation may indemnify
directors and officers, as well as other employees and individuals, against expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred
by any such person in connection with any threatened, pending or completed actions, suits or
proceedings in which such person is made a party by reason of such person being or having been a
director, officer, employee or agent of the Registrant. The Delaware General Corporation Law
provides that Section 145 is not exclusive of other rights to which those seeking indemnification
may be entitled under any bylaw, agreement, vote of stockholders or disinterested directors or
otherwise. Article XII of the Registrant's Amended and Restated Certificate of Incorporation and
Article VI of the Registrant's Bylaws provide for indemnification by the Registrant of its
directors and officers to the fullest extent permitted by the Delaware General Corporation Law.
Section 102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in its
certificate of incorporation that a director of the corporation shall not be personally liable to
the corporation or its stockholders for monetary damages for breach of fiduciary duty as a
director, except for liability (i) for any breach of the director's duty of loyalty to the
corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) for unlawful payments of dividends or
unlawful stock repurchases, redemptions or other distributions, or (iv) for any transaction from
which the director derived an improper personal benefit. The Registrant's Amended and Restated
Certificate of Incorporation provides for such limitation of liability.
The Registrant has obtained directors' and officers' insurance providing indemnification for
certain of the Registrant's directors, officers and employees for certain liabilities.
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The Registrant has entered into indemnification agreements with each director and executive officer
which provide indemnification under certain circumstances for acts and omissions which may not be
covered by any directors' and officers' liability insurance.
Item 7. Exemption From Registration Claimed.
Not applicable.
Item 8. Exhibits.
Exhibit
Number
Name
5.1
Opinion of Orrick, Herrington & Sutcliffe LLP
23.1
Consent of Independent Registered Public Accounting Firm
23.2
Consent of Orrick, Herrington & Sutcliffe LLP (included in Exhibit
5.1 to this Registration Statement)
24
Power of Attorney (See signature page to this Registration Statement)
Item 9. Undertakings.
(a) The undersigned Registrant hereby undertakes:
(1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:
(i) To include any prospectus required by Section 10(a)(3) of the Securities Act;
(ii) To reflect in the prospectus any facts or events arising after the effective date
of the Registration Statement (or the most recent post-effective amendment thereof) which,
individually or in the aggregate, represent a fundamental change in the information set
forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease
in volume of securities offered (if the dollar value of securities offered would not exceed
that which was registered) and any deviation from the low or high end of the estimated
maximum offering range may be reflected in the form of prospectus filed with the Commission
pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no
more than a 20 percent change in the maximum aggregate offering price set forth in the
"Calculation of Registration Fee" table in the effective Registration Statement;
(iii) To include any material information with respect to the plan of distribution not
previously disclosed in the Registration Statement or any material change to such
information in the Registration Statement;
provided
,
however
, that paragraphs (1)(i) and (1)(ii) do not apply if the information
required to be included in the post-effective amendment by those paragraphs is contained in
periodic reports filed with or furnished to the Commission by the Registrant pursuant to
Section 13 or 15(d) of the Exchange Act that are incorporated by reference in this
Registration Statement.
(2) That, for the purpose of determining any liability under the Securities Act, each
such post-effective amendment shall be deemed to be a new registration statement relating to
the securities offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.
(3) To remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.
(b) The undersigned Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Registrant's annual report pursuant to
Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement shall be deemed
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to be a new Registration Statement relating to the securities offered therein, and the offering of
such securities at that time shall be deemed to be the initial bona fide offering thereof.
(c) Insofar as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers and controlling persons of the Registrant pursuant to the
foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the
Commission such indemnification is against public policy as expressed in the Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such liabilities (other than
the payment by the Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or proceeding) is asserted
by such director, officer or controlling person in connection with the securities being registered,
the Registrant will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.
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SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has
reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has
duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of San Jose, State of California, on the
29
th
day of March, 2007.
PDF SOLUTIONS, INC.
(Registrant)
By:
/s/ John K. Kibarian
John K. Kibarian
President and Chief Executive Officer
POWER OF ATTORNEY
Each of the undersigned directors of PDF Solutions, Inc., a Delaware
corporation (the
"Company"), hereby constitutes and appoints John K. Kibarian and Keith A. Jones, and each of them,
his true and lawful attorneys-in-fact, with full power of substitution, for him or her and in his
or her name, place and stead, in his or her capacity as a director, to execute a Registration
Statement or Registration Statements on Form S-8 under the Securities Act of 1933, as amended,
 relating to 1,956,348 shares of Common Stock that are issuable under
the PDF Solutions, Inc. 2001 Stock Plan  and 2001 Employee Stock Purchase
Plan (the "Plans") and any and all amendments (including post-effective amendments) to such
Registration Statements, and to file such Registration Statements and any and all amendments
thereto, with exhibits thereto, and other documents in connection therewith, with the Securities
and Exchange Commission, granting unto such attorneys-in-fact full power and authority to do and
perform each and every act and thing necessary or desirable to be done in and about the premises,
as fully to all intents and purposes, as he or she might or could do in person, and ratify and
confirm all that such attorneys-in-fact or their substitutes may lawfully do or cause to be done by
virtue hereof, and hereby consents to such registration of the Shares and the issuance thereof
pursuant to the terms of the Plans. Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the capacities and on the dates
indicated.
Signature
Title
Date
/s/ John K. Kibarian
Chief Executive Officer,
March 29, 2007
John K. Kibarian
President
and Director
/s/ Keith A. Jones
Chief Financial Officer,
March 29, 2007
Keith A. Jones
Vice
President, Finance
/s/ Kimon Michaels
Vice President, Field Operations
March 29, 2007
Kimon Michaels
and
Director
/s/ Tom Caulfield
Director
March 29, 2007
Tom Caulfield
/s/ Lucio L. Lanza
Director
March 29, 2007
Lucio L. Lanza
/s/ Sue Billat
Director
March 29, 2007
Sue Billat
/s/ Dr. Albert Y. C. Yu
Director
March 29, 2007
Dr. Albert Y. C. Yu
/s/ R. Stephen Heinrichs
Director
March 29, 2007
R. Stephen Heinrichs
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EXHIBIT INDEX
Exhibit
Number
Name
5.1
Opinion of Orrick, Herrington & Sutcliffe LLP
23.1
Consent of Independent Registered Public Accounting Firm
23.2
Consent of Orrick, Herrington & Sutcliffe LLP is included in Exhibit
5.1 to this Registration Statement
24
Power of Attorney (See signature page to this Registration Statement)