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

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>As filed with the Securities and Exchange Commission on June 30, 2009</B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Registration No.&nbsp;333-</B></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<BR>
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: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


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

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>F5 NETWORKS, 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"><B>Washington</B><BR>
(State or other jurisdiction of incorporation or organization)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>91-1714307</B><BR>
(I.R.S. Employer Identification No.)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt">4<B>01 Elliott Avenue West, Seattle, Washington 98119</B><BR>
(Address of Principal Executive Offices)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>F5 NETWORKS, INC. 2005 EQUITY INCENTIVE PLAN<BR>
F5 NETWORKS, INC. 1999 EMPLOYEE STOCK PURCHASE PLAN</B><BR>
(Full Title of the Plans)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Jeffrey A. Christianson<BR>
F5 Networks, Inc.<BR>
401 Elliott Avenue West<BR>
Seattle, WA 98119</B><BR>
(Name and Address of Agent for Service)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>(206)&nbsp;272-5555</B><BR>
(Telephone Number, Including Area Code, of Agent for Service)</DIV>

 <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Indicate by check mark whether the registrant is a large
 accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions
 of &#147;large accelerated filer,&#148; &#147;accelerated filer&#148; and &#147;smaller reporting
 company&#148; in Rule&nbsp;12b-2 of the
 Exchange Act. (Check one):</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="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="22%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="left" valign="top">Large accelerated filer <FONT face="Wingdings">&#254;</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Accelerated filer <FONT face="Wingdings">&#111;</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Non-accelerated filer <FONT face="Wingdings">&#111;</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Smaller reporting company <FONT face="Wingdings">&#111;</FONT></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="5" valign="top" align="center">(Do not check if
smaller reporting company)<BR></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><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="35%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="38%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&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">Proposed maximum</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Proposed maximum</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 nowrap align="center">Title of each class of securities to be</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Amount to be</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">offering price per</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">aggregate offering</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Amount of</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center">registered</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">registered (1)</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">share (2)</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">price</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">registration fee</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, no
par value, reserved
for  issuance
under the F5
Networks, Inc. 2005
Equity Incentive
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">5,000,000 shares</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">$33.41</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">$167,050,000</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">$9,321.39</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, no
par value, reserved
for issuance under
the F5 Networks,
Inc. 1999 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">2,000,000 shares</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">$28.40</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">$56,800,000</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">$3,169.44</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">7,000,000 shares</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">&nbsp;</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">$223,850,000</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">$12,490.83</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>Pursuant to Rule&nbsp;416(a), this Registration Statement shall also cover
any additional shares of common stock, no par value of the registrant
(&#147;Common Stock&#148;) that become issuable under the F5 Networks, Inc. 2005
Equity Incentive Plan or the F5 Networks, Inc. 1999 Employee Stock
Purchase Plan by reason of any stock dividend, stock split,
recapitalization or other similar transaction effected without receipt
of consideration that increases the number of 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>Computed in accordance with Rule 457(h) and Rule&nbsp;457(c), solely for
the purpose of calculating the registration fee. For shares of the
Common Stock that may be issued pursuant to the F5 Networks, Inc. 2005
Equity Incentive Plan, the maximum aggregate offering price was
computed based on the average of the high and low prices of the Common
Stock as reported by The Nasdaq Global Market on June 24, 2009. For
shares of the Common Stock that may be issued pursuant to the F5
Networks, Inc. 1999 Employee Stock Purchase Plan, the maximum
aggregate offering price was computed based on 85% of the average of
the high and low prices of the Common Stock of the registrant as
reported by The Nasdaq Global Market on June 24, 2009. Pursuant to the
F5 Networks, Inc. 1999 Employee Stock Purchase Plan, the purchase
price per share at which shares are sold under the F5 Networks, Inc.
1999 Employee Stock Purchase Plan is the lower of (i)&nbsp;85% of the fair
market value per share at the time the option is granted at the
commencement of the offering period, and (ii)&nbsp;85% of the fair market
value per share at the time the option is exercised on the applicable
purchase date.</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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<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>


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

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


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;F5 Networks, Inc. (the &#147;Registrant&#148; or the &#147;Company&#148;) has amended (a)&nbsp;the F5 Networks, Inc.
2005 Equity Incentive Plan (as amended, the &#147;2005 Plan&#148;) to increase, by 5,000,000 shares, the
number of shares of the Company&#146;s common stock, no par value (&#147;Common Stock&#148;), available for
issuance under the 2005 Plan and (b)&nbsp;the F5 Networks, Inc. 1999 Employee Stock Purchase Plan (as
amended, the &#147;ESPP&#148;) to increase, by 2,000,000 shares, the number of shares of Common Stock
available for issuance under the ESPP (the additional shares available for issuance under the 2005
Plan and the ESPP, collectively, the &#147;Additional Shares&#148;). This Registration Statement is being
filed to register the Additional Shares.
</DIV>

<!-- link1 "PART II" -->

<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" 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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents filed by the Company with the Securities and Exchange Commission are
incorporated by reference into this Registration Statement:
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Annual Report on Form 10-K for the year ended September&nbsp;30, 2008;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Quarterly Report on Form 10-Q for the quarters ended December&nbsp;31, 2008 and March&nbsp;31,
2009;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Current Reports on Form 8-K filed January&nbsp;7, 2009 and May&nbsp;4, 2009; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 2%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) the description of the Company&#146;s Common Stock contained in the Company&#146;s Registration
Statement on  Form 8-A, filed May&nbsp;11, 1999, including any amendments or reports filed for the
purposes of updating such description.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents subsequently filed by the Company pursuant to Sections&nbsp;13(a), 13(c), 14 or 15(d)
of the Securities Exchange Act of 1934, 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 herein and to be part hereof from
the date of filing of such documents. Unless specifically stated to the contrary, none of the
information that the Company discloses under Items 2.02 or 7.01 of any current report on Form 8-K
that the Company may from time to time furnish to the Securities and Exchange Commission will be
incorporated by reference into, or otherwise included in, this Registration Statement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A statement contained herein or in a document incorporated or deemed to be incorporated by
reference herein, shall be deemed to be modified or superseded for purposes of this Registration
Statement to the extent that a statement contained in any subsequently filed document which is
incorporated by reference herein, modifies or supersedes the statement. Any statements so modified
or superseded shall not be deemed, except as so modified or superseded, to constitute a part of
this Registration Statement.
</DIV>

<!-- link2 "Item&nbsp;4. Description of Securities" -->

<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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable
</DIV>
<!-- link2 "Item&nbsp;5. Interests of Named Experts and Counsel" -->

<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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable
</DIV>
<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers" -->

<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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sections&nbsp;23B.08.500 through 23.B.08.600 of the Washington Business Corporation Act (the
&#147;WBCA&#148;) authorize a court to award, or a corporation&#146;s board of directors to grant, indemnification
to directors and officers on terms sufficiently broad to permit indemnification under certain
circumstances for liabilities arising under the Securities Act of 1933, as amended (the &#147;Securities
Act&#148;). Section&nbsp;23B.08.320 of the WBCA authorizes a corporation to limit a director&#146;s liability to
the corporation or its shareholders for monetary damages for acts or omissions as a director,
except in certain circumstances involving intentional misconduct, knowing violations of law
</DIV>

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

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

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


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">or illegal corporate loans or distributions, or any transaction from which the director
personally receives a benefit in money, property or services to which the director is not legally
entitled.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Company&#146;s Second Amended and Restated Articles of Incorporation and Third Amended and
Restated Bylaws contain provisions permitting the Company to indemnify its directors and officers
to the full extent permitted by Washington law. In addition, the Company&#146;s Second Amended and
Restated Articles of Incorporation contain a provision implementing, to the fullest extent
permitted by Washington law, the above limitations on a director&#146;s liability to the Company and its
shareholders. The Company has entered into certain indemnification agreements with its directors
and certain of its officers, the form of which is attached as Exhibit&nbsp;10.1 to its Registration
Statement on Form S-1 (File No.&nbsp;333-75817). The indemnification agreements provide the Company&#146;s
directors and certain of its officers with indemnification to the maximum extent permitted by the
WBCA. The directors and officers of the Company also may be indemnified against liability they may
incur for serving in that capacity pursuant to a liability insurance policy maintained by the
Company for this purpose.
</DIV>

<!-- link2 "Item&nbsp;7. Exemption from Registration Claimed" -->

<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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable
</DIV>
<!-- link2 "Item&nbsp;8. Exhibits" -->

<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="3%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="94%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Exhibit Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Exhibit</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Second Amended and Restated Articles of Incorporation (Incorporated by reference to
Exhibit&nbsp;3.2 to the Registrant&#146;s Registration Statement on Form&nbsp;S-1, File No.
333-75817).</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">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Third Amended and Restated Bylaws (Incorporated by reference to Exhibit&nbsp;3.2 to the
Registrant&#146;s Quarterly Report on Form&nbsp;10-Q for the period ended December&nbsp;31, 2008).</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">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Specimen Stock Certificate (Incorporated by reference to Exhibit&nbsp;4.1 to the
Registrant&#146;s Registration Statement on Form&nbsp;S-1, File No.&nbsp;333-75817).</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">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of K&#038;L Gates 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">10.17
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">F5 Networks, Inc. 1999 Employee
Stock Purchase Plan.</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">10.21
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">F5 Networks, Inc. 2005 Equity Incentive Plan (Incorporated by reference to Exhibit
10.21 to the Registrant&#146;s Quarterly Report on Form&nbsp;10-Q for the period ended March
31, 2009).</TD>
</TR>
<TR><TD style="font-size: 10pt">&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 PricewaterhouseCoopers LLP, 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 K&#038;L Gates LLP (Included in its opinion filed as Exhibit&nbsp;5.1).</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">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (Included on the signature page of this Registration Statement).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<!-- link2 "Item&nbsp;9. Undertakings" -->

<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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;To include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act of 1933;
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;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;
</DIV>

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

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

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

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;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"><I>Provided, however, </I>that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information
required to be included in a post-effective amendment by those paragraphs is contained in periodic
reports filed by the Registrant pursuant to Section&nbsp;13 or Section 15(d) of the Securities Exchange
Act of 1934 that are incorporated by reference in this Registration Statement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;That, for the purpose of determining any liability under the Securities Act of 1933,
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 <I>bona fide </I>offering thereof.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;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 of 1933, each filing of the Registrant&#146;s annual report pursuant
to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is incorporated by
reference in the Registration Statement 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 <I>bona fide </I>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 of 1933
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
Securities and Exchange Commission such indemnification is against public policy as expressed in
the Securities Act of 1933 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 of whether such indemnification by it is against public
policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of
such issue.
</DIV>

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

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>



<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "Signatures" -->

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


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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 Seattle, State of
Washington, on June 29, 2009.
</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="44%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="25%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left"><B>F5 NETWORKS, INC.</B></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By:
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ John McAdam
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
John McAdam, Chief Executive
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Officer and President</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each person whose signature appears below constitutes and appoints John McAdam or Jeffrey
Christianson, or either of them, his or her, as applicable, true and lawful attorney-in-fact, with
the power of substitution and resubstitution, for him or her, as applicable, in his or her name,
place or stead, in any and all capacities, to sign any or all amendments to this Registration
Statement, and to file the same, with exhibits thereto and other documents in connection therewith,
with the Securities and Exchange Commission, hereby ratifying and confirming all that said
attorneys-in-fact and their agents or substitutes, may lawfully do or lawfully cause to be done by
virtue hereof.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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="25%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="50%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" 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 valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ John McAdam
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Chief Executive Officer,&nbsp;President, and Director

</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">June 29, 2009</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">John McAdam
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(principal executive officer)</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ John Rodriquez
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Senior Vice President, Chief&nbsp;Accounting Officer

</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">June 29, 2009</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">John Rodriquez
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(principal financial officer)</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ A. Gary Ames
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">June 29, 2009</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">A. Gary Ames</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Deborah L. Bevier
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">June 29, 2009</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Deborah L. Bevier</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Karl D. Guelich
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">June 29, 2009</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Karl D. Guelich</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Alan J. Higginson
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">June 29, 2009</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Alan J. Higginson</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Scott Thompson
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Director&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">June 29, 2009</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Scott Thompson</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" 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 -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "EXHIBIT INDEX" -->

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><U><B>EXHIBIT INDEX</B></U>
</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="3%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="94%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Exhibit Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Exhibit</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Second Amended and Restated Articles of Incorporation (Incorporated by reference to
Exhibit&nbsp;3.2 to the Registrant&#146;s Registration Statement on Form&nbsp;S-1, File No.
333-75817).</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">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Third Amended and Restated Bylaws (Incorporated by reference to Exhibit&nbsp;3.2 to the
Registrant&#146;s Quarterly Report on Form&nbsp;10-Q for the period ended December&nbsp;31, 2008).</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">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Specimen Stock Certificate (Incorporated by reference to Exhibit&nbsp;4.1 to the
Registrant&#146;s Registration Statement on Form&nbsp;S-1, File No.&nbsp;333-75817).</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">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of K&#038;L Gates 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">10.17
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">F5 Networks, Inc. 1999 Employee
Stock Purchase Plan.</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">10.21
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">F5 Networks, Inc. 2005 Equity Incentive Plan (Incorporated by reference to Exhibit
10.21 to the Registrant&#146;s Quarterly Report on Form&nbsp;10-Q for the period ended March
31, 2009).</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 PricewaterhouseCoopers LLP, 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 K&#038;L Gates LLP (Included in its opinion filed as Exhibit&nbsp;5.1).</TD>
</TR>
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    <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">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (Included on the signature page of this Registration Statement).</TD>
</TR>
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[{"type": "S-8", "sequence": "1", "filename": "v52821sv8.htm", "description": "FORM S-8", "secsgml_size_bytes": 48054}]
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sv8
As filed with the Securities and Exchange Commission on June 30, 2009
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
F5 NETWORKS, INC.
(Exact name of registrant as specified in its charter)
Washington
(State or other jurisdiction of incorporation or organization)
91-1714307
(I.R.S. Employer Identification No.)
4
01 Elliott Avenue West, Seattle, Washington 98119
(Address of Principal Executive Offices)
F5 NETWORKS, INC. 2005 EQUITY INCENTIVE PLAN
F5 NETWORKS, INC. 1999 EMPLOYEE STOCK PURCHASE PLAN
(Full Title of the Plans)
Jeffrey A. Christianson
F5 Networks, Inc.
401 Elliott Avenue West
Seattle, WA 98119
(Name and Address of Agent for Service)
(206) 272-5555
(Telephone Number, Including Area Code, of Agent for Service)
Indicate by check mark whether the registrant is a large
 accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions
 of "large accelerated filer," "accelerated filer" and "smaller reporting
 company" in Rule 12b-2 of the
 Exchange Act. (Check one):
Large accelerated filer
þ
Accelerated filer
o
Non-accelerated filer
o
Smaller reporting company
o
(Do not check if
smaller reporting company)
CALCULATION OF REGISTRATION FEE
Proposed maximum
Proposed maximum
Title of each class of securities to be
Amount to be
offering price per
aggregate offering
Amount of
registered
registered (1)
share (2)
price
registration fee
Common Stock, no
par value, reserved
for  issuance
under the F5
Networks, Inc. 2005
Equity Incentive
Plan
5,000,000 shares
$33.41
$167,050,000
$9,321.39
Common Stock, no
par value, reserved
for issuance under
the F5 Networks,
Inc. 1999 Employee
Stock Purchase Plan
2,000,000 shares
$28.40
$56,800,000
$3,169.44
Total:
7,000,000 shares
$223,850,000
$12,490.83
(1)
Pursuant to Rule 416(a), this Registration Statement shall also cover
any additional shares of common stock, no par value of the registrant
("Common Stock") that become issuable under the F5 Networks, Inc. 2005
Equity Incentive Plan or the F5 Networks, Inc. 1999 Employee Stock
Purchase Plan by reason of any stock dividend, stock split,
recapitalization or other similar transaction effected without receipt
of consideration that increases the number of outstanding shares of
Common Stock.
(2)
Computed in accordance with Rule 457(h) and Rule 457(c), solely for
the purpose of calculating the registration fee. For shares of the
Common Stock that may be issued pursuant to the F5 Networks, Inc. 2005
Equity Incentive Plan, the maximum aggregate offering price was
computed based on the average of the high and low prices of the Common
Stock as reported by The Nasdaq Global Market on June 24, 2009. For
shares of the Common Stock that may be issued pursuant to the F5
Networks, Inc. 1999 Employee Stock Purchase Plan, the maximum
aggregate offering price was computed based on 85% of the average of
the high and low prices of the Common Stock of the registrant as
reported by The Nasdaq Global Market on June 24, 2009. Pursuant to the
F5 Networks, Inc. 1999 Employee Stock Purchase Plan, the purchase
price per share at which shares are sold under the F5 Networks, Inc.
1999 Employee Stock Purchase Plan is the lower of (i) 85% of the fair
market value per share at the time the option is granted at the
commencement of the offering period, and (ii) 85% of the fair market
value per share at the time the option is exercised on the applicable
purchase date.
EXPLANATORY NOTE
F5 Networks, Inc. (the "Registrant" or the "Company") has amended (a) the F5 Networks, Inc.
2005 Equity Incentive Plan (as amended, the "2005 Plan") to increase, by 5,000,000 shares, the
number of shares of the Company's common stock, no par value ("Common Stock"), available for
issuance under the 2005 Plan and (b) the F5 Networks, Inc. 1999 Employee Stock Purchase Plan (as
amended, the "ESPP") to increase, by 2,000,000 shares, the number of shares of Common Stock
available for issuance under the ESPP (the additional shares available for issuance under the 2005
Plan and the ESPP, collectively, the "Additional Shares"). This Registration Statement is being
filed to register the Additional Shares.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The following documents filed by the Company with the Securities and Exchange Commission are
incorporated by reference into this Registration Statement:
(a) Annual Report on Form 10-K for the year ended September 30, 2008;
(b) Quarterly Report on Form 10-Q for the quarters ended December 31, 2008 and March 31,
2009;
(c) Current Reports on Form 8-K filed January 7, 2009 and May 4, 2009; and
(d) the description of the Company's Common Stock contained in the Company's Registration
Statement on  Form 8-A, filed May 11, 1999, including any amendments or reports filed for the
purposes of updating such description.
All documents subsequently filed by the Company pursuant to Sections 13(a), 13(c), 14 or 15(d)
of the Securities Exchange Act of 1934, 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 herein and to be part hereof from
the date of filing of such documents. Unless specifically stated to the contrary, none of the
information that the Company discloses under Items 2.02 or 7.01 of any current report on Form 8-K
that the Company may from time to time furnish to the Securities and Exchange Commission will be
incorporated by reference into, or otherwise included in, this Registration Statement.
A statement contained herein or in a document incorporated or deemed to be incorporated by
reference herein, shall be deemed to be modified or superseded for purposes of this Registration
Statement to the extent that a statement contained in any subsequently filed document which is
incorporated by reference herein, modifies or supersedes the statement. Any statements so modified
or superseded shall not be deemed, except as so modified or superseded, to constitute a part of
this Registration Statement.
Item 4. Description of Securities.
Not Applicable
Item 5. Interests of Named Experts and Counsel.
Not Applicable
Item 6. Indemnification of Directors and Officers.
Sections 23B.08.500 through 23.B.08.600 of the Washington Business Corporation Act (the
"WBCA") authorize a court to award, or a corporation's board of directors to grant, indemnification
to directors and officers on terms sufficiently broad to permit indemnification under certain
circumstances for liabilities arising under the Securities Act of 1933, as amended (the "Securities
Act"). Section 23B.08.320 of the WBCA authorizes a corporation to limit a director's liability to
the corporation or its shareholders for monetary damages for acts or omissions as a director,
except in certain circumstances involving intentional misconduct, knowing violations of law
or illegal corporate loans or distributions, or any transaction from which the director
personally receives a benefit in money, property or services to which the director is not legally
entitled.
The Company's Second Amended and Restated Articles of Incorporation and Third Amended and
Restated Bylaws contain provisions permitting the Company to indemnify its directors and officers
to the full extent permitted by Washington law. In addition, the Company's Second Amended and
Restated Articles of Incorporation contain a provision implementing, to the fullest extent
permitted by Washington law, the above limitations on a director's liability to the Company and its
shareholders. The Company has entered into certain indemnification agreements with its directors
and certain of its officers, the form of which is attached as Exhibit 10.1 to its Registration
Statement on Form S-1 (File No. 333-75817). The indemnification agreements provide the Company's
directors and certain of its officers with indemnification to the maximum extent permitted by the
WBCA. The directors and officers of the Company also may be indemnified against liability they may
incur for serving in that capacity pursuant to a liability insurance policy maintained by the
Company for this purpose.
Item 7. Exemption from Registration Claimed.
Not Applicable
Item 8. Exhibits.
Exhibit Number
Exhibit
4.1
Second Amended and Restated Articles of Incorporation (Incorporated by reference to
Exhibit 3.2 to the Registrant's Registration Statement on Form S-1, File No.
333-75817).
4.2
Third Amended and Restated Bylaws (Incorporated by reference to Exhibit 3.2 to the
Registrant's Quarterly Report on Form 10-Q for the period ended December 31, 2008).
4.3
Specimen Stock Certificate (Incorporated by reference to Exhibit 4.1 to the
Registrant's Registration Statement on Form S-1, File No. 333-75817).
5.1
Opinion of K&L Gates LLP.
10.17
F5 Networks, Inc. 1999 Employee
Stock Purchase Plan.
10.21
F5 Networks, Inc. 2005 Equity Incentive Plan (Incorporated by reference to Exhibit
10.21 to the Registrant's Quarterly Report on Form 10-Q for the period ended March
31, 2009).
23.1
Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.
23.2
Consent of K&L Gates LLP (Included in its opinion filed as Exhibit 5.1).
24.1
Power of Attorney (Included on the signature page of 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 of 1933;
(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;
(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 (a)(1)(i) and (a)(1)(ii) do not apply if the information
required to be included in a post-effective amendment by those paragraphs is contained in periodic
reports filed by the Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange
Act of 1934 that are incorporated by reference in this Registration Statement.
(2) That, for the purpose of determining any liability under the Securities Act of 1933,
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 of 1933, each filing of the Registrant's annual report pursuant
to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is incorporated by
reference in the Registration Statement 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.
(c) Insofar as indemnification for liabilities arising under the Securities Act of 1933
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
Securities and Exchange Commission such indemnification is against public policy as expressed in
the Securities Act of 1933 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 of whether such indemnification by it is against public
policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of
such issue.
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 Seattle, State of
Washington, on June 29, 2009.
F5 NETWORKS, INC.
By:
/s/ John McAdam
John McAdam, Chief Executive
Officer and President
Power of Attorney
Each person whose signature appears below constitutes and appoints John McAdam or Jeffrey
Christianson, or either of them, his or her, as applicable, true and lawful attorney-in-fact, with
the power of substitution and resubstitution, for him or her, as applicable, in his or her name,
place or stead, in any and all capacities, to sign any or all amendments to this Registration
Statement, and to file the same, with exhibits thereto and other documents in connection therewith,
with the Securities and Exchange Commission, hereby ratifying and confirming all that said
attorneys-in-fact and their agents or substitutes, may lawfully do or lawfully cause to be done by
virtue hereof.
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 McAdam
Chief Executive Officer, President, and Director
June 29, 2009
John McAdam
(principal executive officer)
/s/ John Rodriquez
Senior Vice President, Chief Accounting Officer
June 29, 2009
John Rodriquez
(principal financial officer)
/s/ A. Gary Ames
Director
June 29, 2009
A. Gary Ames
/s/ Deborah L. Bevier
Director
June 29, 2009
Deborah L. Bevier
/s/ Karl D. Guelich
Director
June 29, 2009
Karl D. Guelich
/s/ Alan J. Higginson
Director
June 29, 2009
Alan J. Higginson
/s/ Scott Thompson
Director
June 29, 2009
Scott Thompson
EXHIBIT INDEX
Exhibit Number
Exhibit
4.1
Second Amended and Restated Articles of Incorporation (Incorporated by reference to
Exhibit 3.2 to the Registrant's Registration Statement on Form S-1, File No.
333-75817).
4.2
Third Amended and Restated Bylaws (Incorporated by reference to Exhibit 3.2 to the
Registrant's Quarterly Report on Form 10-Q for the period ended December 31, 2008).
4.3
Specimen Stock Certificate (Incorporated by reference to Exhibit 4.1 to the
Registrant's Registration Statement on Form S-1, File No. 333-75817).
5.1
Opinion of K&L Gates LLP.
10.17
F5 Networks, Inc. 1999 Employee
Stock Purchase Plan.
10.21
F5 Networks, Inc. 2005 Equity Incentive Plan (Incorporated by reference to Exhibit
10.21 to the Registrant's Quarterly Report on Form 10-Q for the period ended March
31, 2009).
23.1
Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.
23.2
Consent of K&L Gates LLP (Included in its opinion filed as Exhibit 5.1).
24.1
Power of Attorney (Included on the signature page of this Registration Statement).