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<H5 align="left" style="page-break-before:always"><A HREF="#B86409toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 10pt"><B>As filed with the Securities and Exchange Commission on May&nbsp;6, 2011.</B>
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 10pt"><B>File No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</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: 10pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>WASHINGTON, DC 20549</B>
</DIV>

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

<DIV align="center" style="font-size: 18pt; margin-top: 10pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 10pt"><B>REGISTRATION STATEMENT<BR>
UNDER<BR>
THE SECURITIES ACT OF 1933</B>
</DIV>


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

<DIV align="center" style="font-size: 24pt; margin-top: 10pt"><B>ACME PACKET, INC.</B>
</DIV>

<DIV align="center" style="font-size: 10pt"><I>(Exact Name of Registrant as Specified in Its Charter)</I></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>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>DELAWARE</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>04-3526641</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><I>(State or Other Jurisdiction of Incorporation or <BR>
Organization)</I>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><I>(I.R.S. Employer<BR>
Identification No.)</I></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>100 Crosby Drive, Bedford, MA 01730</B><BR>
<I>(Address of Principal Executive Office)( Zip Code)</I></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>ACME PACKET, INC.<BR>
2011 EMPLOYEE STOCK PURCHASE PLAN</B><BR>
<I>(Full title of the plans)</I></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>Andrew D. Ory<BR>
Acme Packet, Inc.<BR>
100 Crosby Drive<BR>
Bedford, MA 01730</B><BR>
<I>(Name and address of Agent for Service)</I></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>(781)&nbsp;328-4400</B><BR>
<I>(Telephone Number, including area code, for agent for service)</I></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:<BR>
Julio E. Vega, Esq.<BR>
Matthew J. Cushing, Esq.<BR>
Bingham McCutchen LLP<BR>
One Federal Street<BR>
Boston, MA 02110<BR>
Telephone: (617)&nbsp;951-8000<BR>
Facsimile: (617)&nbsp;951-8736</B>
</div>

<DIV align="left" style="font-size: 10pt; margin-top: 8pt">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 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>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Large accelerated filer <FONT style="font-family: Wingdings">&#254;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Accelerated filer <FONT style="font-family: Wingdings">&#111;</FONT></FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Non-accelerated filer <FONT style="font-family: Wingdings">&#111;</FONT></FONT>
<FONT style="white-space: nowrap">(Do not check if a smaller reporting company)</FONT>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><FONT style="white-space: nowrap">Smaller reporting company <FONT style="font-family: Wingdings">&#111;</FONT></FONT></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="54%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="23" 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>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>Proposed</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>Proposed</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">&nbsp;</TD>
    <TD>&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 nowrap align="center" colspan="2"><B>Amount</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>maximum</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>maximum</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>Amount of</B></TD>
    <TD>&nbsp;</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</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>to be</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>offering price</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>aggregate</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>registration</B></TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>securities to be registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>registered</B>(1)</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>per share</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>offering price</B></TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><B>fee</B>(3)</TD>
    <TD>&nbsp;</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"><B>2011 Employee Stock Purchase Plan</B></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 style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000">2,500,000</TD>
    <TD 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 nowrap align="left" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">80.82</TD>
    <TD nowrap style="border-top: 2px solid #000000">(2)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="left" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">202,050,000</TD>
    <TD nowrap style="border-top: 2px solid #000000">(2)</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="left" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" style="border-top: 2px solid #000000">23,459</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock (par value $0.001 per share)</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD style="border-top: 0px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 0px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="23" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

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


<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 6pt; 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>In addition, pursuant to Rule 416(c) under the Securities Act of 1933, as amended, this
Registration Statement also covers an indeterminate number of additional shares of common stock
that may be offered or issued in the event of a stock dividend, reverse stock split, split-up,
recapitalization, forfeiture of stock under those plans, or other similar event.</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 estimate price of $80.82 per share, which is the average of the high and low
proposed initial offering price of the common stock as reported on the NASDAQ Global Select Market
on May&nbsp;2, 2011, is set forth solely for the purpose of calculating the fee pursuant to Rule 457(c)
and (h), and has been used only for those shares without a fixed exercise price. None of such
shares have been issued or are subject to outstanding options.</TD>
</TR>

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

<TR valign="top">
    <TD nowrap align="left">(3)</TD>
    <TD>&nbsp;</TD>
    <TD>Calculated pursuant to Section 6(b) of the Securities Act of 1933, as amended.</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>

<!-- PAGEBREAK -->
<P><HR noshade><P>

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


<!-- TOC -->
<A name="B86409toc"><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>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="76%"></TD>
</TR>
<TR><TD colspan="9"><A HREF="#B86409000">PART I</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409001">Item&nbsp;1. Plan Information*</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409002">Item&nbsp;2. Registrant Information and Employee Plan Annual Information*</A></TD></TR>
<TR><TD colspan="9"><A HREF="#B86409003">PART II</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409004">Item&nbsp;3. Incorporation of Documents by Reference</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409005">Item&nbsp;4. Description of Securities</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409006">Item&nbsp;5. Interests of Named Experts and Counsel</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409007">Item&nbsp;6. Indemnification of Directors and Officers</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409008">Item&nbsp;7. Exemption from Registration Claimed</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#B86409009">Item&nbsp;8. Exhibits</A></TD></TR>
<TR><TD colspan="9"><A HREF="#B86409010">SIGNATURES AND POWER OF ATTORNEY</A></TD></TR>
<TR><TD colspan="9"><A HREF="#B86409011">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="b86409exv5w1.htm">EX-5.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="b86409exv23w1.htm">EX-23.1</A></TD></TR>
</TABLE>
</CENTER>
<!-- /TOC -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#B86409toc">Table of Contents</A></H5><P>



<!-- link1 "PART I" -->
<DIV align="left"><A NAME="B86409000"></A></DIV>

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


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</B>
</DIV>
<!-- link2 "Item&nbsp;1. Plan Information*" -->
<DIV align="left"><A NAME="B86409001"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;1. Plan Information*</B>
</DIV>

<!-- link2 "Item&nbsp;2. Registrant Information and Employee Plan Annual Information*" -->
<DIV align="left"><A NAME="B86409002"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;2. Registrant Information and Employee Plan Annual Information*</B>
</DIV>

<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 3pt; margin-left: 20px; text-indent: -20px">*&nbsp;&nbsp;&nbsp;&nbsp;Information required by Part&nbsp;I to be contained in the Section 10(a) Prospectus is omitted from
this Registration Statement in accordance with Rule&nbsp;428 under the Securities Act of 1933, as
amended (the &#147;<U>Securities Ac</U>t&#148;), and in accordance with the Introductory Note to Part&nbsp;I of
Form S-8.
</DIV>

<!-- link1 "PART II" -->
<DIV align="left"><A NAME="B86409003"></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="B86409004"></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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents filed by the Registrant with the Securities and Exchange Commission
(the &#147;<U>Commission</U>&#148;) pursuant to the Securities Act or the Securities Exchange Act of 1934,
as amended (the &#147;<U>Exchange Act</U>&#148;), are hereby incorporated by reference into this
Registration Statement:
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Registrant&#146;s Annual Report on Form 10-K for the year ended December&nbsp;31, 2010 filed
on February&nbsp;18, 2011;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>All other reports filed by the Registrant pursuant to Sections 13(a) or 15(d) of the
Exchange Act since the end of the year covered by the registration statement referred to in
(a)&nbsp;above; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The section entitled &#147;Description of Registrant&#146;s Securities to be Registered&#148;
contained in the Registrant&#146;s Registration Statement on Form 8-A (file No.&nbsp;001-33041) filed
with the Commission on September&nbsp;22, 2006, pursuant to Section 12(b) of the Exchange Act,
including any amendment or report filed for the purpose of updating such description.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition, all documents filed with the Commission pursuant to Sections&nbsp;13(a), 13(c), 14 and
15(d) of the Exchange Act subsequent to the date of this Registration Statement and prior to the
filing of a post-effective amendment which indicates that all securities registered hereby have
been sold or which deregisters all of such securities then remaining unsold, shall be deemed to be
incorporated by reference into 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="B86409005"></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">&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"><A NAME="B86409006"></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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None.
</DIV>

<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers" -->
<DIV align="left"><A NAME="B86409007"></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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145 of the Delaware General Corporation Law provides that a Delaware corporation may
indemnify its officers and directors and certain other persons to the extent and under the
circumstances set forth therein.
</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"><A HREF="#B86409toc">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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Article&nbsp;Seven of the Registrant&#146;s Amended and Restated Certificate of Incorporation, and
Article&nbsp;VII of the Registrant&#146;s Amended and Restated By-Laws, provide that the Registrant will
indemnify its directors, officers, employees and agents to the full extent permitted by Delaware
General Corporation Law, including in circumstances in which indemnification is discretionary under
Delaware law. The indemnification provisions in the Registrant&#146;s Amended and Restated Certificate
of Incorporation and By-Laws may be sufficiently broad to permit indemnification of said directors
and officers for liabilities (including reimbursement for expenses incurred) arising under the
Securities Act. The Registrant intends to maintain director and officer liability insurance, if
available on reasonable terms, to insure said directors and officers against the costs of defense,
settlement, or judgment under certain circumstances.
</DIV>

<!-- link2 "Item&nbsp;7. Exemption from Registration Claimed" -->
<DIV align="left"><A NAME="B86409008"></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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<!-- link2 "Item&nbsp;8. Exhibits" -->
<DIV align="left"><A NAME="B86409009"></A></DIV>

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


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following exhibits are filed as part of this registration statement:
</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="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000"><B>Exhibit <BR>
Number</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Exhibit Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Amended and Restated Certificate of Incorporation of the Registrant
(incorporated by reference to Exhibit&nbsp;3.3 to the Registrant&#146;s Registration
Statement on Form&nbsp;S-1 (Commission File No.&nbsp;333-134683)).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Amended and Restated Bylaws of the Registrant (incorporated by reference
to Exhibit&nbsp;3.4 to the Registrant&#146;s Registration Statement on Form&nbsp;S-1
(Commission File No.&nbsp;333-134683)).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.3</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Specimen certificate evidencing shares of common stock (incorporated by
reference to Exhibit&nbsp;4.1 to the Registrant&#146;s Registration Statement on Form
S-1 (Commission File No.&nbsp;333-134683)).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">5.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Opinion of Bingham McCutchen LLP with respect to the legality of the shares
being registered.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">2011 Employee Stock Purchase Plan of the Registrant (incorporated by
reference to Appendix&nbsp;A to the Registrant&#146;s Proxy Statement filed with the
SEC on March&nbsp;23, 2011).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">23.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Consent of Ernst &#038; Young LLP, Independent Registered Public Accounting Firm.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">23.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Consent of Bingham McCutchen LLP (included in Exhibit&nbsp;5.1).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">24</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Power of Attorney (included in signature page hereto).</DIV></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"><A HREF="#B86409toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link1 "SIGNATURES AND POWER OF ATTORNEY" -->
<DIV align="left"><A NAME="B86409010"></A></DIV>

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


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, 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 Town of Bedford, Commonwealth of Massachusetts,
on this 6th day of May, 2011.
</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">ACME PACKET, INC.<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/ Andrew D. Ory
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top">Name:&nbsp;&nbsp;</TD>
    <TD align="left">Andrew D. Ory&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top">Title:&nbsp;&nbsp;</TD>
    <TD align="left">President and Chief Executive Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby
constitutes and appoints Andrew D. Ory and Patrick J. MeLampy, and each of them, as such person&#146;s
true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution,
for such person and in such person&#146;s name, place and stead, in any and all capacities, to sign any
and all amendments (including post-effective amendments) and additions to this registration
statement on Form S-8 and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, and hereby grants to such
attorneys-in-fact and agents full power and authority to do and perform each and every act and
thing requisite and necessary to be done, as fully to all intents and purposes as such person might
or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents
or such person&#146;s substitute or substitutes may lawfully do or cause to be done by virtue hereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&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 indicated as of the 6th day of May, 2011.
</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="35%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="62%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title</B></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>
</TR>

<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Andrew D. Ory
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Andrew D. Ory
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">President and Chief Executive Officer&nbsp;<BR>Director
(Principal Executive Officer)</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Peter J. Minihane
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Peter J. Minihane
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Financial Officer and Treasurer&nbsp;<BR>(Principal
Accounting and Financial Officer)</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Gary J. Bowen
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Gary J. Bowen
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ David B. Elsbree
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
David B. Elsbree
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Robert C. Hower
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Robert C. Hower
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Patrick J. MeLampy
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Patrick J. MeLampy
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Technology Officer; Director&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>
</TR>

<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ J. Russell Muirhead
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
J. Russell Muirhead
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Robert G. Ory
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Robert G. Ory
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director&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"><A HREF="#B86409toc">Table of Contents</A></H5><P>

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

<!-- link1 "EXHIBIT INDEX" -->
<DIV align="left"><A NAME="B86409011"></A></DIV>

<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="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Exhibit <BR>
Number</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Exhibit Description</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated Certificate of Incorporation of the Registrant
(incorporated by reference to Exhibit&nbsp;3.3 to the Registrant&#146;s Registration
Statement on Form&nbsp;S-1 (Commission File No.&nbsp;333-134683)).</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>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated Bylaws of the Registrant (incorporated by reference
to Exhibit&nbsp;3.4 to the Registrant&#146;s Registration Statement on Form&nbsp;S-1
(Commission File No.&nbsp;333-134683)).</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>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Specimen certificate evidencing shares of common stock (incorporate by
reference to Exhibit&nbsp;4.1 to the Registrant&#146;s Registration Statement on Form
S-1 (Commission File No.&nbsp;333-134683)).</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>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Bingham McCutchen LLP with respect to the legality of the shares
being registered.</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>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">10.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">2011 Employee Stock Purchase Plan of the Registrant (incorporated by
reference to Appendix&nbsp;A to the Registrant&#146;s Proxy Statement filed with the
SEC on March&nbsp;23, 2011).</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>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Ernst &#038; Young LLP, Independent Registered Public Accounting Firm.</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>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Bingham McCutchen LLP (included in Exhibit&nbsp;5.1).</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>
</TR>
<TR valign="bottom">
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    <TD align="left" valign="top">Power of Attorney (included in signature page hereto).</TD>
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[{"type": "S-8", "sequence": "1", "filename": "b86409sv8.htm", "description": "FORM S-8", "secsgml_size_bytes": 45076}]
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sv8
Table of Contents
As filed with the Securities and Exchange Commission on May 6, 2011.
File No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
ACME PACKET, INC.
(Exact Name of Registrant as Specified in Its Charter)
DELAWARE
04-3526641
(State or Other Jurisdiction of Incorporation or
Organization)
(I.R.S. Employer
Identification No.)
100 Crosby Drive, Bedford, MA 01730
(Address of Principal Executive Office)( Zip Code)
ACME PACKET, INC.
2011 EMPLOYEE STOCK PURCHASE PLAN
(Full title of the plans)
Andrew D. Ory
Acme Packet, Inc.
100 Crosby Drive
Bedford, MA 01730
(Name and address of Agent for Service)
(781) 328-4400
(Telephone Number, including area code, for agent for service)
Copy to:
Julio E. Vega, Esq.
Matthew J. Cushing, Esq.
Bingham McCutchen LLP
One Federal Street
Boston, MA 02110
Telephone: (617) 951-8000
Facsimile: (617) 951-8736
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 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
(Do not check if a smaller reporting company)
Smaller reporting company
o
CALCULATION OF REGISTRATION FEE
Proposed
Proposed
Amount
maximum
maximum
Amount of
Title of
to be
offering price
aggregate
registration
securities to be registered
registered
(1)
per share
offering price
fee
(3)
2011 Employee Stock Purchase Plan
2,500,000
$
80.82
(2)
$
202,050,000
(2)
$
23,459
Common Stock (par value $0.001 per share)
(1)
In addition, pursuant to Rule 416(c) under the Securities Act of 1933, as amended, this
Registration Statement also covers an indeterminate number of additional shares of common stock
that may be offered or issued in the event of a stock dividend, reverse stock split, split-up,
recapitalization, forfeiture of stock under those plans, or other similar event.
(2)
The estimate price of $80.82 per share, which is the average of the high and low
proposed initial offering price of the common stock as reported on the NASDAQ Global Select Market
on May 2, 2011, is set forth solely for the purpose of calculating the fee pursuant to Rule 457(c)
and (h), and has been used only for those shares without a fixed exercise price. None of such
shares have been issued or are subject to outstanding options.
(3)
Calculated pursuant to Section 6(b) of the Securities Act of 1933, as amended.
TABLE OF CONTENTS
PART I
Item 1. Plan Information*
Item 2. Registrant Information and Employee Plan Annual Information*
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
SIGNATURES AND POWER OF ATTORNEY
EXHIBIT INDEX
EX-5.1
EX-23.1
Table of Contents
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
Item 1. Plan Information*
Item 2. Registrant Information and Employee Plan Annual Information*
*    Information required by Part I to be contained in the Section 10(a) Prospectus is omitted from
this Registration Statement in accordance with Rule 428 under the Securities Act of 1933, as
amended (the "
Securities Ac
t"), and in accordance with the Introductory Note to Part I of
Form S-8.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference
The following documents filed by the Registrant with the Securities and Exchange Commission
(the "
Commission
") pursuant to the Securities Act or the Securities Exchange Act of 1934,
as amended (the "
Exchange Act
"), are hereby incorporated by reference into this
Registration Statement:
(a)
The Registrant's Annual Report on Form 10-K for the year ended December 31, 2010 filed
on February 18, 2011;
(b)
All other reports filed by the Registrant pursuant to Sections 13(a) or 15(d) of the
Exchange Act since the end of the year covered by the registration statement referred to in
(a) above; and
(c)
The section entitled "Description of Registrant's Securities to be Registered"
contained in the Registrant's Registration Statement on Form 8-A (file No. 001-33041) filed
with the Commission on September 22, 2006, pursuant to Section 12(b) of the Exchange Act,
including any amendment or report filed for the purpose of updating such description.
In addition, all documents filed with the Commission pursuant to Sections 13(a), 13(c), 14 and
15(d) of the Exchange Act subsequent to the date of this Registration Statement and prior to the
filing of a post-effective amendment which indicates that all securities registered hereby have
been sold or which deregisters all of such securities then remaining unsold, shall be deemed to be
incorporated by reference into 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.
None.
Item 6. Indemnification of Directors and Officers.
Section 145 of the Delaware General Corporation Law provides that a Delaware corporation may
indemnify its officers and directors and certain other persons to the extent and under the
circumstances set forth therein.
Table of Contents
Article Seven of the Registrant's Amended and Restated Certificate of Incorporation, and
Article VII of the Registrant's Amended and Restated By-Laws, provide that the Registrant will
indemnify its directors, officers, employees and agents to the full extent permitted by Delaware
General Corporation Law, including in circumstances in which indemnification is discretionary under
Delaware law. The indemnification provisions in the Registrant's Amended and Restated Certificate
of Incorporation and By-Laws may be sufficiently broad to permit indemnification of said directors
and officers for liabilities (including reimbursement for expenses incurred) arising under the
Securities Act. The Registrant intends to maintain director and officer liability insurance, if
available on reasonable terms, to insure said directors and officers against the costs of defense,
settlement, or judgment under certain circumstances.
Item 7. Exemption from Registration Claimed.
Not applicable.
Item 8. Exhibits
The following exhibits are filed as part of this registration statement:
Exhibit
Number
Exhibit Description
4.1
Amended and Restated Certificate of Incorporation of the Registrant
(incorporated by reference to Exhibit 3.3 to the Registrant's Registration
Statement on Form S-1 (Commission File No. 333-134683)).
4.2
Amended and Restated Bylaws of the Registrant (incorporated by reference
to Exhibit 3.4 to the Registrant's Registration Statement on Form S-1
(Commission File No. 333-134683)).
4.3
Specimen certificate evidencing shares of common stock (incorporated by
reference to Exhibit 4.1 to the Registrant's Registration Statement on Form
S-1 (Commission File No. 333-134683)).
5.1
Opinion of Bingham McCutchen LLP with respect to the legality of the shares
being registered.
10.1
2011 Employee Stock Purchase Plan of the Registrant (incorporated by
reference to Appendix A to the Registrant's Proxy Statement filed with the
SEC on March 23, 2011).
23.1
Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm.
23.2
Consent of Bingham McCutchen LLP (included in Exhibit 5.1).
24
Power of Attorney (included in signature page hereto).
Table of Contents
SIGNATURES AND POWER OF ATTORNEY
Pursuant to the requirements of the Securities Act of 1933, as amended, 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 Town of Bedford, Commonwealth of Massachusetts,
on this 6th day of May, 2011.
ACME PACKET, INC.
By:
/s/ Andrew D. Ory
Name:
Andrew D. Ory
Title:
President and Chief Executive Officer
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby
constitutes and appoints Andrew D. Ory and Patrick J. MeLampy, and each of them, as such person's
true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution,
for such person and in such person's name, place and stead, in any and all capacities, to sign any
and all amendments (including post-effective amendments) and additions to this registration
statement on Form S-8 and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, and hereby grants to such
attorneys-in-fact and agents full power and authority to do and perform each and every act and
thing requisite and necessary to be done, as fully to all intents and purposes as such person might
or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents
or such person's substitute or substitutes may lawfully do or 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 indicated as of the 6th day of May, 2011.
Signature
Title
/s/ Andrew D. Ory
Andrew D. Ory
President and Chief Executive Officer
Director
(Principal Executive Officer)
/s/ Peter J. Minihane
Peter J. Minihane
Chief Financial Officer and Treasurer
(Principal
Accounting and Financial Officer)
/s/ Gary J. Bowen
Gary J. Bowen
Director
/s/ David B. Elsbree
David B. Elsbree
Director
/s/ Robert C. Hower
Robert C. Hower
Director
/s/ Patrick J. MeLampy
Patrick J. MeLampy
Chief Technology Officer; Director
/s/ J. Russell Muirhead
J. Russell Muirhead
Director
/s/ Robert G. Ory
Robert G. Ory
Director
Table of Contents
EXHIBIT INDEX
Exhibit
Number
Exhibit Description
4.1
Amended and Restated Certificate of Incorporation of the Registrant
(incorporated by reference to Exhibit 3.3 to the Registrant's Registration
Statement on Form S-1 (Commission File No. 333-134683)).
4.2
Amended and Restated Bylaws of the Registrant (incorporated by reference
to Exhibit 3.4 to the Registrant's Registration Statement on Form S-1
(Commission File No. 333-134683)).
4.3
Specimen certificate evidencing shares of common stock (incorporate by
reference to Exhibit 4.1 to the Registrant's Registration Statement on Form
S-1 (Commission File No. 333-134683)).
5.1
Opinion of Bingham McCutchen LLP with respect to the legality of the shares
being registered.
10.1
2011 Employee Stock Purchase Plan of the Registrant (incorporated by
reference to Appendix A to the Registrant's Proxy Statement filed with the
SEC on March 23, 2011).
23.1
Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm.
23.2
Consent of Bingham McCutchen LLP (included in Exhibit 5.1).
24
Power of Attorney (included in signature page hereto).