Announces Federal Tax Treatment of 2025 Dividends

Announces Fourth Quarter and Full Year 2025 Earnings Release and Conference Call Schedule

HOUSTON, Jan. 15, 2026 /PRNewswire/ -- Main Street Capital Corporation (NYSE:MAIN) ("Main Street" or the "Company") is pleased to announce its preliminary operating results for the fourth quarter of 2025, the federal tax treatment of its dividends paid in 2025 and its fourth quarter and full year 2025 earnings release and conference call schedule.

In commenting on the Company's preliminary operating results for the fourth quarter of 2025, Dwayne L. Hyzak, Main Street's Chief Executive Officer, stated, "We are extremely pleased with our continued strong performance in the fourth quarter, which closed another great year for Main Street across our key financial metrics, including several new quarterly and annual records. Our preliminary operating results highlight that our fourth quarter performance resulted in another quarter of strong operating results, including favorable distributable net investment income per share and a new record for net asset value per share for the fourteenth consecutive quarter, primarily driven by a significant net fair value increase and including the benefits of material net realized gains in both our lower middle market and private loan investment portfolios. We also produced extremely strong fourth quarter investment activity in our unique lower middle market investment strategy, resulting in an annual record for gross investments of approximately $700 million in 2025. Our fourth quarter results continued our positive performance over the last few years and resulted in an estimated return on equity of over 17% for the quarter and for the full year. We look forward to sharing the full details of our fourth quarter and full year 2025 results in late February."

Preliminary Estimates of Fourth Quarter 2025 Results

Main Street's preliminary estimate of fourth quarter 2025 net investment income ("NII") is $1.01 to $1.05 per share, distributable net investment income ("DNII")⁽¹⁾ is $1.07 to $1.11 per share and DNII before taxes⁽²⁾ is $1.09 to $1.13 per share.

Main Street's preliminary estimate of net asset value ("NAV") per share as of December 31, 2025 is $33.29 to $33.37, representing an increase of $0.51 to $0.59 per share, or 1.5% to 1.8%, from the NAV per share of $32.78 as of September 30, 2025, with this increase after the impact of the supplemental dividend paid in December 2025 of $0.30 per share. The estimated NAV per share increase is primarily due to the net fair value increase of the investment portfolio and the accretive impact of equity issuances, partially offset by the net tax provision for the quarter. The net fair value increase of the existing investment portfolio is primarily the result of net fair value increases of the existing lower middle market ("LMM") and private loan investment portfolios, partially offset by net fair value decreases of the wholly-owned asset manager and the residual middle market investment portfolio.

As a result of Main Street's preliminary estimates of NII, the net changes in the fair value of the investment portfolio and the net tax provision as noted above, Main Street estimates that it generated a return on equity of over 17% for both the fourth quarter on an annualized basis and for the full year of 2025.⁽³⁾

Main Street preliminarily estimates that investments on non-accrual status comprised 1.0% of the total investment portfolio at fair value and 3.3% at cost as of December 31, 2025.

Investment Portfolio Activity

The Company's fourth quarter 2025 operating activities include the following investment activity in the LMM and private loan investment strategies:

• $300.0 million in total LMM portfolio investments, which after aggregate repayments and return of invested equity capital, including a decrease in cost basis associated with the exits of several LMM portfolio investments, resulted in a net increase of $253.1 million in the total cost basis of the LMM investment portfolio; and
• $231.4 million in total private loan portfolio investments, which after aggregate repayments, return of invested equity capital associated with the exit of two private loan portfolio investments and a decrease in cost basis due to a realized loss on a private loan portfolio investment resulted in a net increase of $108.8 million in the total cost basis of the private loan investment portfolio.

Federal Tax Treatment of 2025 Dividends

Main Street has posted information regarding the U.S. federal income tax characteristics of its dividends paid in 2025 on its website under "2025 Form 1099 Information" (https://www.mainstcapital.com/investors/listed-securities-information/tax-information).⁽⁴⁾ Main Street paid dividends totaling $4.23 per share in 2025, with approximately 8% of such dividends taxed as qualified dividends and approximately 92% taxed as ordinary income. Qualified dividends paid to non-corporate taxpayers (including individuals) qualify for favorable tax treatment under the Internal Revenue Code ("IRC") and, for 2025, will generally be subject to a maximum 20% U.S. federal income tax rate (plus a 3.8% Medicare surtax, if applicable).

Federal Tax Treatment of 2025 Dividends – Non-U.S. Shareholders

Non-U.S. resident and foreign corporation shareholders ("Non-U.S. Shareholders") in a Regulated Investment Company ("RIC"), such as Main Street, are exempt from U.S. withholding tax on both "interest-related" dividends and short-term capital gains in accordance with the IRC Sections 871(k) and 881(e). In addition, Non-U.S. Shareholders in a RIC are also exempt from U.S. withholding tax on long-term capital gains. Main Street paid dividends totaling $4.23 per share in 2025, with approximately 47% of such dividends relating to "interest-related" dividends and short-term capital gains. See "Tax Treatment of 2025 Dividends to Non-U.S. Shareholders" posted on Main Street's website for more details (https://www.mainstcapital.com/investors/listed-securities-information/tax-information).⁽⁴⁾

To the extent Non-U.S. Shareholder taxes were withheld on dividends distributed, this information may be considered in connection with any claims for refund on taxes made with the U.S. Internal Revenue Service. Non-U.S. Shareholders should contact their tax advisor with any questions regarding this information.

Fourth Quarter and Full Year 2025 Earnings Release and Conference Call Schedule

Main Street will release its fourth quarter and full year 2025 results on Thursday, February 26, 2026, after the financial markets close. In conjunction with the release, Main Street has scheduled a conference call, which will be broadcast live via phone and over the Internet, on Friday, February 27, 2026, at 10:00 a.m. Eastern time. Investors may participate either by phone or audio webcast.⁽⁴⁾

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 lower middle market companies and debt capital to private companies owned by or in the process of being acquired by a private equity fund. Main Street's portfolio investments are typically made to support management buyouts, recapitalizations, growth financings, refinancings and acquisitions of companies that operate in diverse industry sectors. Main Street seeks to partner with entrepreneurs, business owners and management teams and generally provides customized "one-stop" debt and equity financing solutions within its lower middle market investment strategy. Main Street seeks to partner with private equity fund sponsors and primarily invests in secured debt investments in its private loan investment strategy. Main Street's lower middle market portfolio companies generally have annual revenues between $10 million and $150 million. Main Street's private loan portfolio companies generally have annual revenues between $25 million and $500 million.

Main Street, through its wholly-owned portfolio company MSC Adviser I, LLC ("MSC Adviser"), also maintains an asset management business through which it manages investments for external parties. MSC Adviser is registered as an investment adviser under the Investment Advisers Act of 1940, as amended.

FORWARD-LOOKING STATEMENTS AND OTHER MATTERS

Main Street cautions that statements in this press release which are forward-looking and provide other than historical information, including but not limited to the preliminary estimates of fourth quarter and full year 2025 financial information and results, are based on current conditions and information available to Main Street as of the date hereof. Although its management believes that the expectations reflected in those forward-looking statements are reasonable, Main Street can give no assurance that those expectations will prove to be correct. Those forward-looking statements are made based on various underlying assumptions and are subject to numerous uncertainties and risks, including, without limitation, such factors described under the captions "Cautionary Statement Concerning Forward-Looking Statements" and "Risk Factors" included in Main Street's filings with the U.S. Securities and Exchange Commission (the "SEC") (www.sec.gov). Main Street undertakes no obligation to update the information contained herein to reflect subsequently occurring events or circumstances, except as required by applicable securities laws and regulations.

The preliminary estimates of fourth quarter and full year 2025 financial information and results furnished above are based on Main Street management's preliminary determinations and current expectations, and such information is inherently uncertain. The preliminary estimates provided herein have been prepared by, and are the responsibility of, management and are subject to completion of Main Street's customary year-end closing and review procedures and third-party audit, including the determination of the fair value of Main Street's portfolio investments. As a result, actual results could differ materially from the current preliminary estimates based on adjustments made during Main Street's year-end closing and review procedures and third-party audit, and Main Street's reported information in its Annual Report on Form 10-K for the year ended December 31, 2025 may differ from this information, and any such differences may be material. In addition, the information furnished above does not include all of the information regarding Main Street's financial condition and results of operations for the fourth quarter and full year periods ended December 31, 2025 that may be important to readers. As a result, readers are cautioned not to place undue reliance on the information furnished in this press release and should view this information in the context of Main Street's full fourth quarter and full year 2025 results when such results are disclosed by Main Street in its Annual Report on Form 10-K for the year ended December 31, 2025. The information furnished in this press release is based on Main Street management's current expectations that involve substantial risks and uncertainties that could cause actual results to differ materially from the results expressed in, or implied by, such information.

Neither this press release nor the 2025 Form 1099 Information or the Tax Treatment of 2025 Dividends to Non-U.S. Shareholders information referenced above is intended to constitute tax, legal, investment or other professional advice. This is general information and reference should be made to your 2025 Form 1099-DIV for tax reporting purposes. Shareholders should receive their 2025 Form 1099-DIVs by mid-February 2026 (generally from their brokers) and should consult a tax advisor for tax guidance pertinent to their specific facts and circumstances. If you did not hold Main Street stock for all of calendar year 2025, your 1099-DIV will only reflect the tax characteristics for the portion of the year you owned Main Street stock.

Main Street has an existing effective Registration Statement on Form N-2 on file with the SEC relating to the offer and sale from time to time of its securities. Investors are advised to carefully consider the investment objective, risks and charges and expenses of Main Street before investing in any of Main Street's securities. The prospectus included in the Registration Statement on Form N-2, together with any related prospectus supplement, contain this and other information about Main Street and should be read carefully before investing. A copy of the prospectus and any related prospectus supplement may be obtained by contacting Main Street.

Endnotes

(1)  DNII is NII as determined in accordance with U.S. Generally Accepted Accounting Principles, or U.S. GAAP, excluding the impact of non-cash compensation expenses, which includes both share-based compensation expenses and deferred compensation expense or benefit. Main Street believes presenting DNII per share is useful and appropriate supplemental disclosure for analyzing its financial performance since (i) share-based compensation does not require settlement in cash and (ii) deferred compensation expense or benefit does not result in a net cash impact to Main Street upon settlement. However, DNII is a non-U.S. GAAP measure and should not be considered as a replacement for NII and other earnings measures presented in accordance with U.S. GAAP. Instead, DNII should be reviewed only in connection with such U.S. GAAP measures in analyzing Main Street's financial performance. In order to reconcile estimated DNII per share to estimated NII per share in accordance with U.S. GAAP for the fourth quarter of 2025, an estimated $0.07 per share of non-cash compensation expenses are added back to estimated NII to calculate estimated DNII per share.

(2)  DNII before taxes is NII before taxes as determined in accordance with U.S. GAAP, excluding the impact of non-cash compensation expenses, which includes both share-based compensation expenses and deferred compensation expense or benefit. Main Street believes presenting DNII before taxes per share is useful and appropriate supplemental disclosure for analyzing its financial performance since (i) share-based compensation does not require settlement in cash, (ii) deferred compensation expense or benefit does not result in a net cash impact to Main Street upon settlement and (iii) tax expenses may include (a) excise tax expense, which is not solely attributable to NII, and (b) deferred taxes, which are not payable in the current period. However, DNII before taxes is a non-U.S. GAAP measure and should not be considered as a replacement for NII, NII before taxes and other earnings measures presented in accordance with U.S. GAAP. Instead, DNII before taxes should be reviewed only in connection with such U.S. GAAP measures in analyzing Main Street's financial performance. In order to reconcile estimated DNII before taxes per share to estimated NII per share in accordance with U.S. GAAP for the fourth quarter of 2025, an estimated $0.07 per share of non-cash compensation expenses and an estimated $0.02 per share of NII related tax expenses are added back to estimated NII to calculate estimated DNII before taxes per share.

(3)  Return on equity equals the net increase in net assets resulting from operations divided by the average quarterly total net assets.

(4)  No information contained on the Company's website or disclosed on the February 27, 2026 conference call, including the webcast and the archived versions, is incorporated by reference in this press release or any of the Company's filings with the SEC, and you should not consider that information to be part of this press release or any other such filing.

Contacts:

Main Street Capital Corporation

Dwayne L. Hyzak, CEO, dhyzak@mainstcapital.com

Ryan R. Nelson, CFO, rnelson@mainstcapital.com

713-350-6000

Dennard Lascar Investor Relations

Ken Dennard / ken@dennardlascar.com

Zach Vaughan / zvaughan@dennardlascar.com

713-529-6600

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SOURCE Main Street Capital Corporation