Main Street Capital Announces Monthly Dividends for July, August and September 2009...

Main Street Capital Announces Monthly Dividends for July, August and September
2009 of $0.125 Per Share

Confirms Projected Dividend Range of $1.50 to $1.65 Per Share for 2009

HOUSTON, May 27 /PRNewswire-FirstCall/ -- Main Street Capital Corporation
(Nasdaq: MAIN) ("Main Street") announced today that its Board of Directors
declared monthly dividends of $0.125 per share for July, August and September
2009. These monthly dividends, which will be payable pursuant to the table
below, equate to a total of $0.375 per share for the third quarter of 2009.
The dividends declared for the third quarter of 2009 represent a 4.2% increase
from the dividends per share paid in the third quarter of 2008. The dividends
per share for the third quarter of 2009 also equate to an approximate
annualized yield of 11.4% based on Main Street's current share price.
Including the dividends declared for the third quarter of 2009, Main Street
will have paid $2.88 in cumulative dividends since its October 2007 initial
public offering.

Summary of Third Quarter 2009 Monthly Dividends

Declared Ex-Dividend Date Record Date Payment Date Amount Per Share
-------- ---------------- ----------- ------------ ----------------
6/3/09 6/17/09 6/19/09 7/15/09 $0.125
6/3/09 7/17/09 7/21/09 8/14/09 $0.125
6/3/09 8/18/09 8/20/09 9/15/09 $0.125
------
Total for Third Quarter 2009: $0.375

Main Street also confirmed its projected dividend range of $1.50 to $1.65 per
share for calendar year 2009. The estimated range for total 2009 dividends
was determined based upon projections of 2009 taxable income, anticipated 2009
portfolio activity, and the estimated amount of undistributed 2008 taxable
income (or "spillover income") which will be utilized to pay dividends during
2009. Main Street will continue to provide quarterly updates to its 2009
dividend guidance based upon actual 2009 taxable income and portfolio
activity.

Main Street's dividends are paid from taxable income, which includes both
ordinary taxable income and capital gains. The Board declares dividends based
on estimates of taxable income available for distribution, which differs from
book income due to (i) changes in unrealized appreciation and depreciation,
(ii) temporary and permanent differences in income and expense recognition,
and (iii) the amount of undistributed taxable income carried over from the
prior year for distribution in the current year. It is currently estimated
that the third quarter 2009 dividends will consist substantially of ordinary
income for tax purposes. It is also currently anticipated that the cumulative
2009 taxable dividends through the third quarter of 2009 will principally
consist of ordinary income for tax purposes. The final determination of 2009
taxable income, as well as the tax attributes for 2009 taxable dividends, will
be made after the close of the 2009 tax year and may differ from the estimates
above.

Main Street maintains a dividend reinvestment plan ("DRIP") that provides for
the reinvestment of dividends on behalf of its stockholders, unless a
stockholder has elected to receive dividends in cash. As a result, if Main
Street declares a cash dividend, our stockholders who have not "opted out" of
the DRIP by the dividend record date will have their cash dividend
automatically reinvested into additional shares of our common stock. Main
Street has the option to satisfy the share requirements of the DRIP through
the issuance of new shares of common stock or through open market purchases of
common stock by the DRIP plan administrator. Newly-issued shares will be
valued based upon the final closing price of Main Street's common stock on a
specified valuation date for each dividend as determined by Main Street's
Board of Directors. Shares purchased in the open market to satisfy the DRIP
requirements will be valued based upon the average price of the applicable
shares purchased by the DRIP plan administrator, before any associated
brokerage or other costs.

ABOUT MAIN STREET CAPITAL CORPORATION
Main Street (www.mainstcapital.com) is a principal investment firm that
provides long-term debt and equity capital to lower middle market companies.
Main Street's investments are made to support management buyouts,
recapitalizations, growth financings and acquisitions of companies that
operate in diverse industry sectors and generally have annual revenues ranging
from $10 million to $100 million. Main Street seeks to partner with
entrepreneurs, business owners and management teams and generally provides
"one-stop" financing alternatives to its portfolio companies.

FORWARD-LOOKING STATEMENTS
This press release may contain certain forward-looking statements, including
but not limited to the annualized dividend yield represented by third quarter
2009 dividends, the projected range for full year 2009 dividends, and the
estimated tax attributes of the cumulative year to date 2009 dividends. Any
such statements, other than statements of historical fact are likely to be
affected by other unknowable future events and conditions, including elements
of the future that are or are not under Main Street's control, and that Main
Street may or may not have considered; accordingly, such statements cannot be
guarantees or assurances of any aspect of future performance. Actual
performance and results could vary materially from these estimates and
projections of the future. Such statements speak only as of the time when
made, and Main Street undertakes no obligation to update any such statement
now or in the future.

Contacts:
Main Street Capital Corporation
Todd A. Reppert, President and CFO
treppert@mainstcapital.com
713-350-6000

Dennard Rupp Gray and Easterly, LLC
Ken Dennard
ksdennard@drg-e.com / 713-529-6600
Augustine Okwu
gokwu@drg-e.com / 404-532-0086

SOURCE Main Street Capital Corporation

Todd A. Reppert, President and CFO of Main Street Capital Corporation,
+1-713-350-6000, treppert@mainstcapital.com; or Ken Dennard, +1-713-529-6600,
ksdennard@drg-e.com, or Augustine Okwu, +1-404-532-0086, gokwu@drg-e.com, both
of Dennard Rupp Gray and Easterly, LLC, for Main Street Capital Corporation