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<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Washington, D.C. 20549</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>FORM 8-K</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Pursuant to Section&nbsp;13 OR 15(d) of<BR>
The Securities Exchange Act of 1934</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">Date of Report (Date of earliest event reported)&nbsp;<B>March
8, 2012</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 18pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 18pt"><B>Main Street
Capital Corporation</B>&nbsp;<BR>
</FONT><FONT STYLE="font-size: 10pt">(Exact name of registrant as specified in its charter)</FONT></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 32%; font-weight: bold; text-align: center">Maryland</TD>
    <TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 32%; font-weight: bold; text-align: center">001-33723</TD>
    <TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 32%; font-weight: bold; text-align: center">41-2230745</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center">(State or other jurisdiction<BR> of incorporation)</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">(Commission File Number)</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">(IRS Employer Identification No.)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 13.5pt">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 14%">&nbsp;</TD>
    <TD STYLE="width: 48%; font-weight: bold; text-align: center"><BR>1300 Post Oak Boulevard, Suite 800, Houston, Texas</TD>
    <TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="width: 21%; font-weight: bold; text-align: center"><BR>77056</TD>
    <TD STYLE="width: 15%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">(Address of principal executive offices)</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">(Zip Code)</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">Registrant&rsquo;s telephone number, including area
code: &nbsp;&nbsp;<B>713-350-6000</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><BR>
<BR>
________________________________________________________________________________<BR>
(Former name or former address, if changed since last report)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 13.5pt"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font-family: Times New Roman, Times, Serif">
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">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:</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Wingdings 2">&#163;&nbsp;</FONT><FONT STYLE="font-size: 10pt">Written communications pursuant to
Rule 425 under the Securities Act (17 CFR 230.425)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Wingdings 2">&#163;&nbsp;</FONT>Soliciting material pursuant to Rule 14a-12 under the Exchange
Act (17 CFR 240.14a-12)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Wingdings 2">&#163;&nbsp;</FONT><FONT STYLE="font-size: 10pt">Pre-commencement communications pursuant
to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Wingdings 2">&#163;&nbsp;</FONT>Pre-commencement communications pursuant to Rule 13e-4(c) under
the Exchange Act (17 CFR 240.13e-4(c))</P>



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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><B>Item 2.02. Results of Operations and Financial Condition.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">On March 8, 2012, the Registrant issued a press release. A copy
of such press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.<BR>
<BR>
The information disclosed under this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed &quot;filed&quot;
for purposes of Section 18 of the Securities Exchange Act of 1934 and shall not be deemed incorporated by reference into any filing
made under the Securities Act of 1933, except as expressly set forth by specific reference in such filing.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt; margin-left: 0in; text-indent: 0.25in; text-align: justify">Exhibit
99.1. &nbsp; &nbsp; &nbsp; Press release dated March 8, 2012</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt; margin-left: 0in; text-indent: 0.25in; text-align: justify">Pursuant
to the requirements of the Securities Exchange Act of 1934, as amended, 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: 0">&nbsp;</P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center; border-bottom: Black 1pt solid"><B>Main Street Capital Corporation</B>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 48%">&nbsp;</TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 47%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">(Registrant)</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; border-bottom: Black 1pt solid"><B>March 8, 2012</B></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center; border-bottom: Black 1pt solid"><B>/s/ &nbsp; Dwayne L. Hyzak&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">(Date)</P></TD>
    <TD>&nbsp;</TD>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 10pt">Dwayne L. Hyzak&nbsp;<BR>
        <I>Chief Financial Officer</I></FONT></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 4.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding: 4.5pt; font-weight: bold">Exhibit Index</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; padding: 4.5pt">&nbsp;</TD>
    <TD STYLE="width: 8%; padding: 4.5pt; text-align: center">99.1</TD>
    <TD STYLE="width: 87%; padding: 4.5pt">Press release dated March 8, 2012</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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{"company-data": {"conformed-name": "Main Street Capital CORP", "cik": "0001396440", "irs-number": "412230745", "state-of-incorporation": "MD", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "814-00746", "film-number": "12678147"}, "business-address": {"street1": "1300 POST OAK BOULEVARD", "street2": "SUITE 800", "city": "HOUSTON", "state": "TX", "zip": "77056", "phone": "(713) 350-6000"}, "mail-address": {"street1": "1300 POST OAK BOULEVARD", "street2": "SUITE 800", "city": "HOUSTON", "state": "TX", "zip": "77056"}}
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)
March
8, 2012
Main Street
Capital Corporation
(Exact name of registrant as specified in its charter)
Maryland
001-33723
41-2230745
(State or other jurisdiction
of incorporation)
(Commission File Number)
(IRS Employer Identification No.)
1300 Post Oak Boulevard, Suite 800, Houston, Texas
77056
(Address of principal executive offices)
(Zip Code)
Registrant's telephone number, including area
code:
713-350-6000
________________________________________________________________________________
(Former name or former address, if changed since last report)
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:
£
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 2.02. Results of Operations and Financial Condition.
On March 8, 2012, the Registrant issued a press release. A copy
of such press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.
The information disclosed under this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed "filed"
for purposes of Section 18 of the Securities Exchange Act of 1934 and shall not be deemed incorporated by reference into any filing
made under the Securities Act of 1933, except as expressly set forth by specific reference in such filing.
Item 9.01. Financial Statements and Exhibits.
Exhibit
99.1.       Press release dated March 8, 2012
SIGNATURE
Pursuant
to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed
on its behalf by the undersigned hereunto duly authorized.
Main Street Capital Corporation
(Registrant)
March 8, 2012
/s/   Dwayne L. Hyzak
(Date)
Dwayne L. Hyzak
Chief Financial Officer
Exhibit Index
99.1
Press release dated March 8, 2012