Main Street Announces Preliminary Operating Performance Estimates for the Third Quarter of 2026

Announces the release time of the financial report for the third quarter of 2026 and the arrangements for the teleconference

Houston, October 15, 2026 / PRNewswire / — Main Street Capital Corporation (NYSE ticker: MAIN, hereinafter referred to as “Main Street” or “the Company”) announced its preliminary operating results for the third quarter of 2026, as well as the schedule for the release of its financial reports for the third quarter of 2026 and a teleconference.

In commenting on the preliminary operating results for the third quarter of 2026, Main Street CEO Dwayne L Hyzak stated: "We are satisfied with the performance in the third quarter. We once again achieved strong operating results this quarter, with the pre-tax distributable net investment income in line with our expectations and the guidance we provided during the last teleconference. Net assets per share also grew for the seventeenth consecutive quarter. We look forward to sharing the full details of the third quarter results for 2026 in a few weeks."

Preliminary Estimates for Third Quarter 2026 Performance

Main Street Preliminary estimates indicate that for the third quarter of 2026, the net income per share (NII) will be between $0.87 and $0.91, the distributable net income per share (DNII) will be between $0.94 and $0.98, and the pre-tax distributable net income per share will be between $0.96 and $1.00.

Main Street Preliminary estimates indicate that as of September 30, 2026, the net asset value per share (NAV) will be between $34.18 and $34.26, an increase of $0.26 to $0.34 from $33.92 on June 30, 2026, representing a growth rate of 0.8% to 1.0%. This increase takes into account the impact of a supplementary dividend of $0.30 per share paid by the company in September 2026.

The company stated that the expected increase in net assets per share mainly comes from the appreciation of the net fair value of the investment portfolio, including both realized and unrealized gains, as well as the dilution effect brought about by equity issuance; this is partially offset by the total dividends paid per share in the third quarter, which were higher than the net investment income per share, and by the provision for net taxes. The appreciation of the net fair value of the investment portfolio is primarily due to the appreciation of the net fair value of the portfolios in lower-end and mid-size markets ( LMM ), private lending portfolios, and other investment portfolios; however, this is partly offset by the depreciation of the net fair value of the mid-size market portfolios and the depreciation of the fair value of wholly-owned external investment managers.

Based on the preliminary estimates of net investment income, net fair value appreciation, and net tax provisions mentioned above, Main Street expects its annualized return on equity for the third quarter to exceed 14%.

Main Street Preliminary estimates indicate that as of September 30, 2026, investments that are not accrued account for 0.9% of the total portfolio based on fair value and 3.5% based on cost.

In addition, during this quarter, the company's wholly-owned investment funds Main Street Mezzanine Fund and LP, which are licensed by the U.S. Small Business Administration (SBA) to operate as investment companies for small businesses (SBIC), have been approved by SBA to increase their bond borrowing capacity by $75 million to $250 million. Together with another wholly-owned investment fund Main Street Capital III also licensed by SBIC, Main Street, the company can now utilize a maximum of $425 million from the regulatory-approved borrowing limit of $475 million for these associated funds. Main Street expects to continue maintaining a certain level of bond balance under the SBIC projects in the future, but this will depend on regular repayments and borrowing conditions, with the potential scale reaching the upper limit permitted by regulations.

Portfolio Activities

The company's operating activities in the third quarter of 2026 included the following LMM and private lending investment strategy-related investment activities:

• LMM portfolio has a total investment of 61.5 million US dollars; after deducting the total repayments, the return of invested equity capital, and the decrease in the cost base due to realized losses, the total cost base of the LMM portfolio has decreased by 19.4 million US dollars;
• The total investment in the private loan portfolio amounted to 162 million US dollars; after deducting the total repayments, the return of invested equity capital, and the decrease in the cost base due to realized losses, the total cost base of the private loan portfolio decreased by 1.8 million US dollars.

2026 Third Quarter Financial Report Release and Conference Call Schedule

Main Street will release its third-quarter results for 2026 after the financial markets close on Thursday, November 5, 2026. In conjunction with the release of the financial report, the company has scheduled a conference call for 10 a.m. Eastern Time on Friday, November 6, 2026, which will be broadcast live via telephone and the internet. Investors can participate via telephone or audio webcast.

About Main Street Capital Corporation

Main Street ( www.mainstcapital.com ) is a principal investment firm that primarily provides customized long-term debt and equity capital solutions to mid-to-small market enterprises, as well as debt capital to private companies held by private equity funds or those that are in the process of being acquired by them. The portfolio of Main Street is typically used to support management acquisitions, capital restructuring, growth financing, refinancing, and acquisitions, covering a range of industry sectors.

Main Street seeks to collaborate with entrepreneurs, business owners, and management teams, providing customized "one-stop" debt and equity financing solutions under its investment strategy for the mid-to-low-end market. Main Street also looks to partner with private equity fund initiators, focusing primarily on secured debt investments as part of its private lending strategy. The annual revenue of companies in Main Street's mid-to-low-end market portfolio typically ranges from 10 million US dollars to 150 million US dollars, while the annual revenue of companies in its private lending portfolio ranges from 25 million US dollars to 500 million US dollars.

Main Street also carries out asset management services through its wholly-owned portfolio companies MSC Adviser I and LLC (operated under the name of Main Street Capital Partners, commonly referred to as " MSCP Adviser"), managing investments for external clients. MSCP Adviser has been registered as an investment advisor in accordance with the revised Investment Advisors Act of 1940.

Forward-looking statements and other matters

Main Street reminds that the forward-looking statements in this press release, as well as other content other than historical information, including but not limited to preliminary estimates for financial information and performance for the third quarter of 2026, are based on the current circumstances and information available to Main Street as of the date of issuance of this press release. Although management believes that the expectations reflected in these forward-looking statements are reasonable, Main Street cannot guarantee that these expectations will ultimately prove to be correct.

These forward-looking statements are based on a number of underlying assumptions and are subject to various uncertainties and risks, including but not limited to those mentioned under the headings “Caution Regarding Forward-Looking Statements” and “Risk Factors” in the documents submitted by Main Street to the U.S. Securities and Exchange Commission (SEC). Except as required by applicable securities laws and regulations, Main Street assumes no obligation to update the information contained in this document due to subsequent events or circumstances.

The above financial information and preliminary performance estimates for the third quarter of 2026 are based on the preliminary judgment and current expectations of the Main Street management team, and therefore carry a degree of uncertainty. The preliminary estimates provided in this document were prepared and are the responsibility of the management. They still need to go through the usual quarterly closing and review procedures of Main Street, as well as third-party reviews, including the determination of the fair value of investments in the Main Street portfolio.

Therefore, the actual results may differ significantly from the current preliminary estimates due to the Main Street quarterly closing and review procedures, as well as adjustments made during the third-party review period. The information disclosed in the 10-Q quarterly report for the quarter ending September 30, 2026, under Main Street, may also differ from the information contained in this document, and any such differences could be significant.

In addition, the aforementioned information does not include all significant details regarding the financial condition and operating results of Main Street for the quarter ending September 30, 2026. Therefore, the company reminds readers not to rely excessively on the information contained in this press release, but to also refer to the complete third-quarter results for 2026 disclosed by Main Street in its 10-Q quarterly report for the same period. The information provided in this document is based on the current expectations of the management of Main Street, which involve significant risks and uncertainties that may lead to substantial differences between the actual results and those explicitly or implicitly stated in this information.

Main Street Currently, there is a Form N -2 registration statement in effect for SEC, which relates to the occasional issuance and sale of its securities. The company advises investors to carefully consider their investment objectives, risks, fees, and expenses before investing in any securities of Main Street. The prospectus attached to the Form N -2 registration statement, as well as any related supplementary prospectuses, contain this and other information regarding Main Street. These documents should be read carefully before making an investment. Copies of the prospectus and any related supplementary prospectuses can be obtained by contacting Main Street.

Contact Information

Main Street Capital Corporation

Dennard Lascar Investor Relations