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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">UNITED STATES</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">SECURITIES
AND EXCHANGE COMMISSION</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center"><FONT STYLE="font-weight: normal">WASHINGTON,
D.C. 20549</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">FORM 8-K</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">CURRENT
REPORT</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">PURSUANT
TO SECTION 13 or 15(<FONT STYLE="text-transform: none">d</FONT>) OF</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">THE SECURITIES
EXCHANGE ACT OF 1934</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><BR>
Date of Report (Date of earliest event reported):&nbsp;&nbsp;<B>April 1, 2012<BR STYLE="mso-special-character: line-break">
<BR STYLE="mso-special-character: line-break">
</B></P>

<P STYLE="font: bold 18pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-transform: uppercase; text-align: center">Prosperity
bancshares, inc.</P>

<P STYLE="font: normal italic 10pt Times New Roman, Times, Serif; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(Exact name of registrant
as specified in its charter)</P>

<P STYLE="font: normal italic 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;&nbsp;</P>

<TABLE ALIGN="CENTER" CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font: 10pt Times New Roman, Times, Serif">
<TR>
    <TD STYLE="width: 33%; padding: 0; text-align: center; font-weight: bold; text-indent: 0">Texas</TD>
    <TD STYLE="width: 33%; padding: 0; text-align: center; font-weight: bold; text-indent: 0">001-35388</TD>
    <TD STYLE="width: 33%; padding: 0; text-align: center; font-weight: bold; text-indent: 0">74-2331986</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: center; text-indent: 0">(State or other jurisdiction of incorporation)</TD>
    <TD STYLE="padding: 0; text-align: center; text-indent: 0">(Commission File Number)</TD>
    <TD STYLE="padding: 0; text-align: center; text-indent: 0">(IRS Employer Identification No.)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>4295 San Felipe</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Houston, Texas 77027</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Address of principal executive offices
including zip code)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Registrant's telephone number, including
area code:<B> (713) 693-9300</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Check the appropriate box below if the
Form&nbsp;8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions
(see General Instruction A.2. below):</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

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<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#120;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Written communications
pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</FONT></TD>
</TR></TABLE>

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<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Soliciting </FONT>material
<FONT STYLE="font-size: 10pt">pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</FONT></TD>
</TR></TABLE>

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<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Pre-</FONT>commencement
<FONT STYLE="font-size: 10pt">communications pursuant to Rule&nbsp;14d-2(b) under the Exchange Act (17&nbsp;CFR 240.14d-2(b))</FONT></TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">Pre-</FONT>commencement
<FONT STYLE="font-size: 10pt">communications pursuant to Rule&nbsp;13e-4(c) under the Exchange Act (17&nbsp;CFR 240.13e-4(c))</FONT></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Item 8.01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other
Events.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">On April 2, 2012, Prosperity
Bancshares, Inc. (&ldquo;Prosperity&rdquo;) issued a press release announcing the closing of the acquisition by Prosperity of The
Bank Arlington. A copy of Prosperity's press release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and
is incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Item 9.01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Financial
Statements and Exhibits.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left">(d)</TD><TD STYLE="text-align: justify; padding-left: 0.24in"><I>Exhibits</I>. The following is furnished as an exhibit
to this Current Report on Form 8-K:</TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 80%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; margin-left: 0.5in">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 12%; padding: 0; text-align: justify; text-indent: 0">Exhibit</TD>
    <TD STYLE="width: 88%; padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-decoration: underline; text-indent: 0">Number</TD>
    <TD STYLE="padding: 0; text-align: justify; text-decoration: underline; text-indent: 0">Description of Exhibit</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">99.1</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">Press Release issued by Prosperity Bancshares, Inc. dated April&nbsp;2,&nbsp;2012.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">Signatures</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">Pursuant to the requirements
of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned
hereunto duly authorized.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
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    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding: 0; text-align: justify; text-indent: 0">PROSPERITY BANCSHARES, INC.</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0; width: 50%">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0; width: 5%">(Registrant)</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0; width: 35%">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0; width: 10%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">Dated:&nbsp; April 2, 2012</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">By:</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0; border-bottom: Black 1pt solid">James D. Rollins III</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">President and Chief Operating Officer</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center"></P>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">exhibit
index</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 80%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse; margin-left: 0.5in">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 12%; padding: 0; text-align: justify; text-indent: 0">Exhibit</TD>
    <TD STYLE="width: 88%; padding: 0; text-align: justify; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-decoration: underline; text-indent: 0">Number</TD>
    <TD STYLE="padding: 0; text-align: justify; text-decoration: underline; text-indent: 0">Description of Exhibit</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">99.1</TD>
    <TD STYLE="padding: 0; text-align: justify; text-indent: 0">Press Release issued by Prosperity Bancshares, Inc. dated April&nbsp;2,&nbsp;2012.</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P>

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{"company-data": {"conformed-name": "PROSPERITY BANCSHARES INC", "cik": "0001068851", "assigned-sic": "6022", "irs-number": "742331986", "state-of-incorporation": "TX", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-35388", "film-number": "12731129"}, "business-address": {"street1": "4295 SAN FELIPE", "street2": "N/A", "city": "HOUSTON", "state": "TX", "zip": "77027", "phone": "7136939300"}, "mail-address": {"street1": "4295 SAN FELIPE", "city": "HOUSTON", "state": "TX", "zip": "77027"}}
UNITED STATES
SECURITIES
AND EXCHANGE COMMISSION
WASHINGTON,
D.C. 20549
FORM 8-K
CURRENT
REPORT
PURSUANT
TO SECTION 13 or 15(
d
) OF
THE SECURITIES
EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported):
April 1, 2012
Prosperity
bancshares, inc.
(Exact name of registrant
as specified in its charter)
Texas
001-35388
74-2331986
(State or other jurisdiction of incorporation)
(Commission File Number)
(IRS Employer Identification No.)
4295 San Felipe
Houston, Texas 77027
(Address of principal executive offices
including zip code)
Registrant's telephone number, including
area code:
(713) 693-9300
Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions
(see General Instruction A.2. below):
x
Written communications
pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨
Soliciting
material
pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨
Pre-
commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨
Pre-
commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 8.01          Other
Events.
On April 2, 2012, Prosperity
Bancshares, Inc. ("Prosperity") issued a press release announcing the closing of the acquisition by Prosperity of The
Bank Arlington. A copy of Prosperity's press release is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and
is incorporated herein by reference.
Item 9.01          Financial
Statements and Exhibits.
(d)
Exhibits
. The following is furnished as an exhibit
to this Current Report on Form 8-K:
Exhibit
Number
Description of Exhibit
99.1
Press Release issued by Prosperity Bancshares, Inc. dated April 2, 2012.
Signatures
Pursuant to the requirements
of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned
hereunto duly authorized.
PROSPERITY BANCSHARES, INC.
(Registrant)
Dated:  April 2, 2012
By:
James D. Rollins III
President and Chief Operating Officer
exhibit
index
Exhibit
Number
Description of Exhibit
99.1
Press Release issued by Prosperity Bancshares, Inc. dated April 2, 2012.